Need help to identify smd diode with marking B1 | Electronics Forum (Circuits, Projects and Microcontrollers)

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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">Need help to identify smd diode with marking B1</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/hrischo192.325890/" class="username u-concealed" dir="auto" data-user-id="325890" data-xf-init="member-tooltip">hrischo192</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/need-help-to-identify-smd-diode-with-marking-b1.166233/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-06-11T07:20:40-0700" data-time="1718115640" data-date-string="Jun 11, 2024" data-time-string="7:20 AM" title="Jun 11, 2024 at 7:20 AM">Jun 11, 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 class="p-body-pageContent"> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166233" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="hrischo192" data-content="post-1452603" id="js-post-1452603" > <span class="u-anchorTarget" id="post-1452603"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/hrischo192.325890/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="325890" data-xf-init="member-tooltip" style="background-color: #5cb8d6; color: #1a5366"> <span class="avatar-u325890-m" role="img" aria-label="hrischo192">H</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/hrischo192.325890/" class="username " dir="auto" data-user-id="325890" data-xf-init="member-tooltip">hrischo192</a></h4> <h5 class="userTitle message-userTitle" dir="auto">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452603" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-06-11T07:20:40-0700" data-time="1718115640" data-date-string="Jun 11, 2024" data-time-string="7:20 AM" title="Jun 11, 2024 at 7:20 AM">Jun 11, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452603" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1452603/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452603" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1452603" data-lb-caption-desc="hrischo192 · Jun 11, 2024 at 7:20 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hello,<br /> I need help to identify smd diode with marking B1 on it. I have tried to find it, but without success. The package is the smallest. The board is motherboard of reolink rlc-410 camera, I cannot find datasheet or schematic for that board.<br /> This looks like that, but it is with marking B2 and I am not sure is it same as B1.<br /> <br /> I found one 100% good and measured values in diode mode are 1.671v and in other direction is 0.794v<br /> <br /> <span style="color: rgb(184, 49, 47)">Link deleted - moderator</span><br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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class="u-dt" dir="auto" datetime="2024-06-11T23:57:01-0700" data-time="1718175421" data-date-string="Jun 11, 2024" data-time-string="11:57 PM" title="Jun 11, 2024 at 11:57 PM">Jun 11, 2024</time> </div> </div> <footer class="message-footer"> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="rjenkinsgb" data-content="post-1452695" id="js-post-1452695" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1452695/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/" /> <span class="u-anchorTarget" id="post-1452695"></span> <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.electro-tech-online.com/members/rjenkinsgb.273344/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/rjenkinsgb.273344/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/rjenkinsgb.273344/" class="avatar avatar--m" data-user-id="273344" data-xf-init="member-tooltip"> <img src="/data/avatars/m/273/273344.jpg?1529068710" srcset="/data/avatars/l/273/273344.jpg?1529068710 2x" alt="rjenkinsgb" class="avatar-u273344-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/rjenkinsgb.273344/" class="username " dir="auto" data-user-id="273344" data-xf-init="member-tooltip"><span itemprop="name">rjenkinsgb</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Well-Known Member</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452695" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-06-14T21:24:23-0700" data-time="1718425463" data-date-string="Jun 14, 2024" data-time-string="9:24 PM" title="Jun 14, 2024 at 9:24 PM" itemprop="datePublished">Jun 14, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452695" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1452695/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452695" rel="nofollow"> #2 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1452695" data-lb-caption-desc="rjenkinsgb · Jun 14, 2024 at 9:24 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Are they against the Ethernet transformer?<br /> <br /> If so they are probably surge suppressors rather than normal diodes.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" 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data-author="hrischo192" data-content="post-1452696" id="js-post-1452696" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1452696/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/" /> <span class="u-anchorTarget" id="post-1452696"></span> <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.electro-tech-online.com/members/hrischo192.325890/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/hrischo192.325890/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/hrischo192.325890/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="325890" data-xf-init="member-tooltip" style="background-color: #5cb8d6; color: #1a5366"> <span class="avatar-u325890-m" role="img" aria-label="hrischo192">H</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/hrischo192.325890/" class="username " dir="auto" data-user-id="325890" data-xf-init="member-tooltip"><span itemprop="name">hrischo192</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452696" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-06-14T23:36:23-0700" data-time="1718433383" data-date-string="Jun 14, 2024" data-time-string="11:36 PM" title="Jun 14, 2024 at 11:36 PM" itemprop="datePublished">Jun 14, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452696" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1452696/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452696" rel="nofollow"> #3 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1452696" data-lb-caption-desc="hrischo192 · Jun 14, 2024 at 11:36 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Thank you for reply. The diodes are connected to transformer, if zoom the picture can see traces and they are on transformer and direct to diode. If it is not normal diode can you send me alternative one, also the values are normal or not. Because on previous post same b1 diode show 1.671v and in other direction is 0.794v, other show 1.015v in both directions.</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="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="aliarifat794" data-content="post-1452701" id="js-post-1452701" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1452701/"> <meta itemprop="parentItem" itemscope 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dir="auto" data-user-id="325293" data-xf-init="member-tooltip"><span itemprop="name">aliarifat794</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Active Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452701" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-06-15T08:36:00-0700" data-time="1718465760" data-date-string="Jun 15, 2024" data-time-string="8:36 AM" title="Jun 15, 2024 at 8:36 AM" itemprop="datePublished">Jun 15, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452701" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1452701/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452701" rel="nofollow"> #4 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1452701" data-lb-caption-desc="aliarifat794 · Jun 15, 2024 at 8:36 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">The closest option to my mind is BAS40-05 (Schottky Diode).</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-06-15T08:44:16-0700" data-time="1718466256" data-date-string="Jun 15, 2024" data-time-string="8:44 AM" title="Jun 15, 2024 at 8:44 AM" itemprop="dateModified">Jun 15, 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="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="rjenkinsgb" data-content="post-1452706" id="js-post-1452706" itemscope itemtype="https://schema.org/Comment" itemid="https://www.electro-tech-online.com/posts/1452706/"> <meta itemprop="parentItem" itemscope 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2024" data-time-string="11:05 PM" title="Jun 15, 2024 at 11:05 PM" itemprop="datePublished">Jun 15, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452706" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1452706/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/post-1452706" rel="nofollow"> #5 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1452706" data-lb-caption-desc="rjenkinsgb · Jun 15, 2024 at 11:05 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Voltage drop readings with the component in circuit are meaningless, as you are also reading through / across any other connected components.<br /> <br /> This is the most likely thing I can find; a bidirectional TVS designed for POE Ethernet port protection:<br /> <br /> <div> <a href="https://www.mouser.co.uk/ProductDetail/Littelfuse/SMAJ51CA?qs=zHiv0nsVGmo8BzVsH3lW3g%3D%3D" class="link link--external" target="_blank" rel="nofollow ugc noopener" data-proxy-href=""> https://www.mouser.co.uk/ProductDetail/Littelfuse/SMAJ51CA?qs=zHiv0nsVGmo8BzVsH3lW3g%3D%3D </a> </div> <br /> The breakdown voltage is guesswork though, without a full circuit of the device....<br /> <br /> <br /> The PCB traces show balanced line connections, so they will not be normal one-way conducting diodes.<br /> <br /> The PCB tracks from the transformer to those components are also thick, but the visible ones beyond there hair fine pairs.<br /> The implication to me is that those are the high power bidirectional protection parts.<br /> <br /> I'd guess there are also connections or diodes on the underside from other transformer pins to the switch mode voltage regulator to the right of that area?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-06-15T23:13:13-0700" data-time="1718518393" data-date-string="Jun 15, 2024" data-time-string="11:13 PM" title="Jun 15, 2024 at 11:13 PM" itemprop="dateModified">Jun 15, 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="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> </div> </div> <div class="block-outer 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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 Electronics Forum (Circuits, Projects and Microcontrollers)", 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>    <div id='div-gpt-eto_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eto_wallpaper'); }); </script> </div>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "WebPage", "url": "https://www.electro-tech-online.com/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/", "mainEntity": { "@type": "DiscussionForumPosting", "@id": "https://www.electro-tech-online.com/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/", "headline": "Need help to identify smd diode with marking B1", "datePublished": "2024-06-11T14:20:40+00:00", "url": "https://www.electro-tech-online.com/threads/need-help-to-identify-smd-diode-with-marking-b1.166233/", "articleSection": "Datasheets, Manuals or Parts", "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/hrischo192.325890/", "name": "hrischo192", "url": "https://www.electro-tech-online.com/members/hrischo192.325890/" }, "interactionStatistic": [ { "@type": "InteractionCounter", "interactionType": "https://schema.org/ViewAction", "userInteractionCount": 7010 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/CommentAction", "userInteractionCount": 4 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/LikeAction", "userInteractionCount": 0 } ], "dateModified": "2024-06-12T06:57:01+00:00", "image": "https://www.electro-tech-online.com/attachments/20240608_130855-jpg.146168/", "articleBody": "Hello,\nI need help to identify smd diode with marking B1 on it. I have tried to find it, but without success. The package is the smallest. The board is motherboard of reolink rlc-410 camera, I cannot find datasheet or schematic for that board.\nThis looks like that, but it is with marking B2 and I am not sure is it same as B1.\n\nI found one 100% good and measured values in diode mode are 1.671v and in other direction is 0.794v\n\nLink deleted - moderator" }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <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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Need help to identify smd diode with marking B1 | Electronics Forum (Circuits, Projects and Microcontrollers)