properly using LM4040C41LPR | Forum for Electronics

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">properly using LM4040C41LPR</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/yefj.624287/" class="username u-concealed" dir="auto" data-user-id="624287" data-xf-init="member-tooltip">yefj</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/properly-using-lm4040c41lpr.412931/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-06T12:16:02+0000" data-time="1730895362" data-date-string="Nov 6, 2024" data-time-string="12:16 PM" title="Nov 6, 2024 at 12:16 PM">Nov 6, 2024</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content">  <div id='div-gpt-eda_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eda_wallpaper'); }); </script> </div> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-412931"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="yefj" data-content="post-1783456" id="js-post-1783456" > <span class="u-anchorTarget" id="post-1783456"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783456" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-06T12:16:02+0000" data-time="1730895362" data-date-string="Nov 6, 2024" data-time-string="12:16 PM" title="Nov 6, 2024 at 12:16 PM">Nov 6, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783456" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1783456/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783456" rel="nofollow"> #1 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar message-avatar--online"> <div class="message-avatar-wrapper"> <a href="/members/yefj.624287/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="624287" data-xf-init="member-tooltip" style="background-color: #47a329; 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9,145 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783466" data-lb-caption-desc="yefj · Nov 6, 2024 at 1:48 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Hello Dana,two questions:<br /> 1.do you reccomend to keep pin 3 floating?<br /> 2.why the "anode" is the minus sign while the say that pin3 is ground?<br /> What kind of diode is that?<br /> where do i put the high voltage where the lower voltage potential(GND)?<br /> Thanks.<br /> <div class="bbImageWrapper js-lbImage" title="1730900852912.png" data-src="https://www.edaboard.com/attachments/1730900852912-png.195161/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img 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</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>1,436</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,393</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=California%2C+USA" rel="nofollow noreferrer" target="_blank" class="u-concealed">California, USA</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 35,695 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783471" data-lb-caption-desc="barry · Nov 6, 2024 at 3:08 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">READ THE DATASHEET!!!<br /> <br /> Stop being willfully ignorant.<br /> <br /> The title of the datasheet tells you exactly “what kind of diode it is”<br /> <br /> YOU post the section of the datasheet that says ‘pin 3 must float’ and then you ask “do you recommend to keep pin 3 floating?”. <br /> <br /> What is your problem?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783471" class="actionBar-action actionBar-action--reply" 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data-author="yefj" data-content="post-1783474" id="js-post-1783474" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1783474/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/" /> <span class="u-anchorTarget" id="post-1783474"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783474" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-06T15:56:39+0000" data-time="1730908599" data-date-string="Nov 6, 2024" data-time-string="3:56 PM" title="Nov 6, 2024 at 3:56 PM" itemprop="datePublished">Nov 6, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783474" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1783474/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783474" rel="nofollow"> #5 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/yefj.624287/"> <meta itemprop="url" content="https://www.edaboard.com/members/yefj.624287/" /> <div class="message-avatar message-avatar--online"> <div class="message-avatar-wrapper"> <a href="/members/yefj.624287/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="624287" data-xf-init="member-tooltip" style="background-color: #47a329; color: #091405"> <span class="avatar-u624287-m" role="img" aria-label="yefj">Y</span> </a> <span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/yefj.624287/" class="username " dir="auto" data-user-id="624287" data-xf-init="member-tooltip"><span itemprop="name">yefj</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 5</h5> </div> <img src="/styles/images/ranks/hlevel2.gif" alt="Advanced Member level 5"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 12, 2019</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>1,516</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/yefj.624287" class="fauxBlockLink-linkRow u-concealed">2</a> </dd> </dl> <dl class="pairs 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15mA should flow threw it.<br /> I dont have ltspice model.<br /> given the datasheet formula below.<br /> Vs=12V Vz=4V What is I_L and I_z?<br /> I_z=15mA<br /> (Vs-Vz)/Rs=(8V)/Rs=I_total<br /> I am confused how can I find the proper Rs needed in this situation.<br /> Thanks.<br /> <br /> <div class="bbImageWrapper js-lbImage" title="1730908858658.png" data-src="https://www.edaboard.com/attachments/1730908858658-png.195168/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1730908858658-png.195168/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1730908858658.png" title="1730908858658.png" width="922" height="547" loading="lazy" /> </div><br /> <div class="bbImageWrapper js-lbImage" title="1730908590266.png" data-src="https://www.edaboard.com/attachments/1730908590266-png.195167/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img 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data-zoom-target="1" style="" alt="1730908561458.png" title="1730908561458.png" width="1701" height="339" loading="lazy" /> </div></div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-06T16:11:45+0000" data-time="1730909505" data-date-string="Nov 6, 2024" data-time-string="4:11 PM" title="Nov 6, 2024 at 4:11 PM" itemprop="dateModified">Nov 6, 2024</time> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783474" class="actionBar-action actionBar-action--reply" 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data-author="barry" data-content="post-1783496" id="js-post-1783496" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1783496/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/" /> <span class="u-anchorTarget" id="post-1783496"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783496" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-07T04:10:11+0000" data-time="1730952611" data-date-string="Nov 7, 2024" data-time-string="4:10 AM" title="Nov 7, 2024 at 4:10 AM" itemprop="datePublished">Nov 7, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783496" 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class="message-userDetails"> <h4 class="message-name"><a href="/members/barry.35520/" class="username " dir="auto" data-user-id="35520" data-xf-init="member-tooltip"><span itemprop="name">barry</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 7</h5> </div> <img src="/styles/images/ranks/hlevel4.gif" alt="Advanced Member level 7"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Mar 31, 2005</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>6,564</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1,206</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/barry.35520" class="fauxBlockLink-linkRow u-concealed">2,424</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>1,436</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,393</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=California%2C+USA" rel="nofollow noreferrer" target="_blank" class="u-concealed">California, USA</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 35,695 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783496" data-lb-caption-desc="barry · Nov 7, 2024 at 4:10 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Do you even know how to read? All the answers are in the datasheet.<br /> <br /> I can explain it to you, but I can’t understand it for you.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783496" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1783496/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> 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class="u-anchorTarget" id="post-1783513"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783513" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-07T09:51:49+0000" data-time="1730973109" data-date-string="Nov 7, 2024" data-time-string="9:51 AM" title="Nov 7, 2024 at 9:51 AM" itemprop="datePublished">Nov 7, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783513" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1783513/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783513" rel="nofollow"> #7 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/yefj.624287/"> <meta itemprop="url" content="https://www.edaboard.com/members/yefj.624287/" /> <div class="message-avatar message-avatar--online"> <div class="message-avatar-wrapper"> <a href="/members/yefj.624287/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="624287" data-xf-init="member-tooltip" style="background-color: #47a329; color: #091405"> <span class="avatar-u624287-m" role="img" aria-label="yefj">Y</span> </a> <span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/yefj.624287/" class="username " dir="auto" data-user-id="624287" data-xf-init="member-tooltip"><span itemprop="name">yefj</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 5</h5> </div> <img src="/styles/images/ranks/hlevel2.gif" alt="Advanced Member level 5"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 12, 2019</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>1,516</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/yefj.624287" class="fauxBlockLink-linkRow u-concealed">2</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>5</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>38</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 9,145 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783513" data-lb-caption-desc="yefj · Nov 7, 2024 at 9:51 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Hello, there is a logical problem ,In the table they say Anode pin 2 should be connecte to ground while pin 1 is the voltage.<br /> But as you can see in the little arrows they say that the minus is on pin 1 so its contradicting because in the table they say that the lower voltage potential should be on pin 2.<br /> Thanks.<br /> <div class="bbImageWrapper js-lbImage" title="1730973101154.png" 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data-content="post-1783526" id="js-post-1783526" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1783526/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/" /> <span class="u-anchorTarget" id="post-1783526"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783526" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-07T12:01:24+0000" data-time="1730980884" data-date-string="Nov 7, 2024" data-time-string="12:01 PM" title="Nov 7, 2024 at 12:01 PM" itemprop="datePublished">Nov 7, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783526" 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data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1730980761774-png.195185/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1730980761774.png" title="1730980761774.png" width="241" height="166" loading="lazy" /> </div><br /> <br /> <div class="bbImageWrapper js-lbImage" title="1730981037784.png" data-src="https://www.edaboard.com/attachments/1730981037784-png.195186/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1730981037784-png.195186/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1730981037784.png" title="1730981037784.png" width="173" height="179" loading="lazy" /> </div><br /> <br /> Anode is - or ground side. The above are correct.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783526" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1783526/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> 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</dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783531" data-lb-caption-desc="yefj · Nov 7, 2024 at 12:36 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Hello Dana , I have connected the diode as shown in the lab below.<br /> I have a real weird phenomena, My out is 12V instead of 4V, but when i check the diode voltage with multimeter between 1 and two i get 1V.<br /> What could cause this?<br /> Thanks.<br /> <div class="bbImageWrapper js-lbImage" title="1730982761863.png" data-src="https://www.edaboard.com/attachments/1730982761863-png.195188/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1730982761863-png.195188/" 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<dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 15,156 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783539" data-lb-caption-desc="danadakk · Nov 7, 2024 at 1:51 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><div class="bbImageWrapper js-lbImage" title="1730986930188.png" data-src="https://www.edaboard.com/attachments/1730986930188-png.195189/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1730986930188-png.195189/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1730986930188.png" title="1730986930188.png" width="229" height="222" loading="lazy" /> </div><br /> <br /> Pinout is bottom view of package, you dont have accidental reverse connections ? Unless<br /> this also is another error in datasheet.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783539" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1783539/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList is-active"> <ul class="reactionSummary"> <li><span class="reaction reaction--small reaction--1" data-reaction-id="1"><i aria-hidden="true"></i><img 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data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="barry" data-content="post-1783547" id="js-post-1783547" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1783547/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/" /> <span class="u-anchorTarget" id="post-1783547"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783547" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-07T15:51:52+0000" data-time="1730994712" data-date-string="Nov 7, 2024" data-time-string="3:51 PM" title="Nov 7, 2024 at 3:51 PM" itemprop="datePublished">Nov 7, 2024</time> 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class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 604253" data-quote="danadakk" data-source="post: 1783526" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1783526" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1783526">danadakk said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Table is in error, as you show earlier this is correct connection<br /> <br /> <a href="https://www.edaboard.com/attachments/195185/" target="_blank">View attachment 195185</a><br /> <br /> <a href="https://www.edaboard.com/attachments/195186/" target="_blank">View attachment 195186</a><br /> <br /> Anode is - or ground side. The above are correct. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>There is nothing wrong with the table : pin 2 is the Anode, FOR THE DBZ PACKAGE ONLY.<br /> <div class="kl_amdp_merge_message"> --- Updated <time class="u-dt" dir="auto" datetime="2024-11-07T15:57:56+0000" data-time="1730995076" data-date-string="Nov 7, 2024" data-time-string="3:57 PM" title="Nov 7, 2024 at 3:57 PM">Nov 7, 2024</time> --- </div><br /> <blockquote data-attributes="member: 624287" data-quote="yefj" data-source="post: 1783531" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1783531" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1783531">yefj said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Hello Dana , I have connected the diode as shown in the lab below.<br /> I have a real weird phenomena, My out is 12V instead of 4V, but when i check the diode voltage with multimeter between 1 and two i get 1V.<br /> What could cause this?<br /> Thanks.<br /> <a href="https://www.edaboard.com/attachments/195188/" target="_blank">View attachment 195188</a> </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>This is my last response to you, I’m not wasting my time any more with any of your ludicrous posts.<br /> <br /> “Out” is the voltage between 2 and ground. Ground is pin1. Therefore, out is the voltage between pins 2 and 1, yet you say you measure 1V between 2 and 1, and 12V at Out.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-07T15:57:56+0000" data-time="1730995076" data-date-string="Nov 7, 2024" data-time-string="3:57 PM" title="Nov 7, 2024 at 3:57 PM" itemprop="dateModified">Nov 7, 2024</time> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/properly-using-lm4040c41lpr.412931/reply?quote=1783547" class="actionBar-action actionBar-action--reply" title="Reply, quoting this 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data-content="post-1783558" id="js-post-1783558" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1783558/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/" /> <span class="u-anchorTarget" id="post-1783558"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783558" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-07T18:04:55+0000" data-time="1731002695" data-date-string="Nov 7, 2024" data-time-string="6:04 PM" title="Nov 7, 2024 at 6:04 PM" itemprop="datePublished">Nov 7, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/properly-using-lm4040c41lpr.412931/post-1783558" 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<span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/yefj.624287/" class="username " dir="auto" data-user-id="624287" data-xf-init="member-tooltip"><span itemprop="name">yefj</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 5</h5> </div> <img src="/styles/images/ranks/hlevel2.gif" alt="Advanced Member level 5"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 12, 2019</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>1,516</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/yefj.624287" class="fauxBlockLink-linkRow u-concealed">2</a> </dd> </dl> <dl class="pairs 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this device is still alive?<br /> Thanks.<br /> <div class="bbImageWrapper js-lbImage" title="1731002188006.png" data-src="https://www.edaboard.com/attachments/1731002188006-png.195198/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1731002188006-png.195198/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1731002188006.png" title="1731002188006.png" width="394" height="775" loading="lazy" /> </div></div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a 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href="/reputation/authors/danadakk.604253" class="fauxBlockLink-linkRow u-concealed">875</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>807</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>113</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 15,156 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1783560" data-lb-caption-desc="danadakk · Nov 7, 2024 at 8:33 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">If you used the 1K no should be OK.<br /> <br /> Just hook it up and give it a go.<br /> <br /> <div class="bbImageWrapper js-lbImage" title="1731011845534.png" data-src="https://www.edaboard.com/attachments/1731011845534-png.195203/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1731011845534-png.195203/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1731011845534.png" title="1731011845534.png" width="394" height="775" loading="lazy" /> </div><br /> <br /> Why did you number your pic reverse order ? 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level 5</h5> </div> <img src="/styles/images/ranks/hlevel2.gif" alt="Advanced Member level 5"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 12, 2019</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>1,516</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/yefj.624287" class="fauxBlockLink-linkRow u-concealed">2</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>5</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>38</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 9,145 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Forum for Electronics", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/", "mainEntity": { "@type": "Question", "@id": "https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/", "name": "properly using LM4040C41LPR", "datePublished": "2024-11-06T12:16:02+00:00", "url": "https://www.edaboard.com/threads/properly-using-lm4040c41lpr.412931/", "image": "https://www.edaboard.com/attachments/1730895332286-png.195156/", "text": "Hello,I have the following components called LM4040C41ILPR, it has 3 pins.\ngiven the schematics below , how can know what each leg represents?\nThanks.\n\nhttps://www.digikey.com/en/products/detail/texas-instruments/LM4040C41ILPR/1666323", "answerCount": 13, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/yefj.624287/", "name": "yefj", "url": "https://www.edaboard.com/members/yefj.624287/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-11-12T09:51:58+00:00", "url": "https://www.edaboard.com/posts/1783797/", "text": "Hello Dana, this is exactly what happened.\nThanks.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/yefj.624287/", "name": "yefj", "url": "https://www.edaboard.com/members/yefj.624287/" } }, { "@type": "Answer", "datePublished": "2024-11-07T20:33:42+00:00", "url": "https://www.edaboard.com/posts/1783560/", "text": "If you used the 1K no should be OK.\n\nJust hook it up and give it a go.\n\n\n\nWhy did you number your pic reverse order ? This is looking at bottom pins pointing at you,\nthe package away from you....", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/danadakk.604253/", "name": "danadakk", "url": "https://www.edaboard.com/members/danadakk.604253/" } }, { "@type": "Answer", "datePublished": "2024-11-07T18:04:55+00:00", "url": "https://www.edaboard.com/posts/1783558/", "text": "Hello Dana,Yes you are probably correct .\nThe third leg is substrate leg.\nWhat do you think did i burn the device?\nIs there a way I could check using multimeter if this device is still alive?\nThanks.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/yefj.624287/", "name": "yefj", "url": "https://www.edaboard.com/members/yefj.624287/" } } ] }, "publisher": { "@type": "Organization", "name": "Forum for Electronics", "description": "International Electronics Discussion Forum: EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals", "url": "https://www.edaboard.com" } } </script> <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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