Inductance of wirewound power resistors

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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">Inductance of wirewound power resistors</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/dick_freebird.159097/" class="username u-concealed" dir="auto" data-user-id="159097" data-xf-init="member-tooltip">dick_freebird</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/inductance-of-wirewound-power-resistors.413111/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-22T17:07:45+0000" data-time="1732295265" data-date-string="Nov 22, 2024" data-time-string="5:07 PM" title="Nov 22, 2024 at 5:07 PM">Yesterday at 5:07 PM</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-413111"> <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="dick_freebird" data-content="post-1784387" id="js-post-1784387" > <span class="u-anchorTarget" id="post-1784387"></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/inductance-of-wirewound-power-resistors.413111/post-1784387" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-22T17:07:45+0000" data-time="1732295265" data-date-string="Nov 22, 2024" data-time-string="5:07 PM" title="Nov 22, 2024 at 5:07 PM">Yesterday at 5:07 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/inductance-of-wirewound-power-resistors.413111/post-1784387" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784387/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/inductance-of-wirewound-power-resistors.413111/post-1784387" 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 "> <div class="message-avatar-wrapper"> <a href="/members/dick_freebird.159097/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="159097" data-xf-init="member-tooltip" style="background-color: #336633; color: #88c388"> <span class="avatar-u159097-m" role="img" aria-label="dick_freebird">D</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/dick_freebird.159097/" class="username " dir="auto" data-user-id="159097" data-xf-init="member-tooltip">dick_freebird</a></h4> <h5 class="userTitle message-userTitle" dir="auto">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 4, 2008</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>9,320</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>2,344</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/dick_freebird.159097" class="fauxBlockLink-linkRow u-concealed">4,709</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>2,605</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=USA" rel="nofollow noreferrer" target="_blank" class="u-concealed">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"> 73,878 </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-1784387" data-lb-caption-desc="dick_freebird · Nov 22, 2024 at 5:07 PM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Working on a test jig to take a 400V GaN power device <br /> to the cyclotron for single event survivability and spurious<br /> drain current testing. This voltage swing needs to be fully <br /> exercised, but my 'scope probes say 300V, yadda yadda.<br /> <br /> Between a resistor divider and a pulse transformer, the<br /> divider looks cleaner if a bit slower. Transformer has the<br /> nice property of being a non-dissipative load but what<br /> we specifically want, may be longer lead time than <br /> remains to the trip.<br /> <br /> "On" power level says I need 150W resistors and some <br /> values plus high pulsed duty will put me in wirewound.<br /> Thick film values are very limited at this power level.<br /> Looking specifically at TE Connectivity (looks like used <br /> to be Ohmite?) FSC150 range. <br /> <br /> My interest in waveform fidelity wants board C and <br /> resistor L minimized. TE Connectivity datasheet says<br /> "low inductance" but no quantitative info found in <br /> the 4 pages of Google hits from "HSC150" "inductance" <br /> "resistor". Only thing I saw was one thesis where the <br /> MOSFET load was ringing pretty badly, and wirewound <br /> resistors were used.<br /> <br /> Couldn't find anything quantitative on TE Connectivity<br /> (was Tyco Electronics) web site.<br /> <br /> What I'm looking for, is any kind of reasonable rough <br /> inductance value for a 1Kohm 150W like this guy (one<br /> of the other divider values):<br /> <br /> <a href="https://www.digikey.com/en/products/detail/te-connectivity-passive-product/HSC1003K9J/5587209" target="_blank" class="link link--external" rel="nofollow ugc noopener">https://www.digikey.com/en/products/detail/te-connectivity-passive-product/HSC1003K9J/5587209</a><br /> <br /> Anybody ever measure, or see a number for this <br /> kind of wirewound?<br /> <br /> <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="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>Sep 26, 2007</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>9,855</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>1,854</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/d-a-tony-stewart.134022" class="fauxBlockLink-linkRow u-concealed">3,709</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>2,408</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,413</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Richmond+Hill%2C+ON%2C+Canada" rel="nofollow 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This can reduce the inductance and improve thermal management.</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/inductance-of-wirewound-power-resistors.413111/reply?quote=1784391" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784391/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 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<dt>Trophy points</dt> <dd>1,413</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Richmond+Hill%2C+ON%2C+Canada" rel="nofollow noreferrer" target="_blank" class="u-concealed">Richmond Hill, ON, Canada</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"> 63,098 </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-1784393" data-lb-caption-desc="D.A.(Tony)Stewart · Nov 22, 2024 at 5:40 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">10 of 25W 10k in parallel with daisy chain ESL and ambient rise? Not much gain I think. But if you twist minimal equal lengths of AWG 24 then you can reduce ESL in connection. Then consider ESL/R is in picoseconds!</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/inductance-of-wirewound-power-resistors.413111/reply?quote=1784393" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784393/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"> 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</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-1784400" data-lb-caption-desc="KlausST · Nov 22, 2024 at 6:38 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 159097" data-quote="dick_freebird" data-source="post: 1784387" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784387" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784387">dick_freebird said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Anybody ever measure, or see a number for this<br /> kind of wirewound? </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote> I can´t give values for the mentioned resistor. <br /> <br /> But years ago I measured a 5W resitor in ceramics ... those 20 x 5 x 5 mm THM ones with leads on both ends. <br /> If I remember right it was a 47 Ohms one ... but at 1MHz they were far from 47 Ohms.<br /> <br /> Klaus</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/inductance-of-wirewound-power-resistors.413111/reply?quote=1784400" 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js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784401" data-lb-caption-desc="D.A.(Tony)Stewart · Nov 22, 2024 at 6:48 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">With 1k and 100ns step response, HOW would one define low ESL? by HF BW?<br /> ESL= Tau*R = 1e-7 * 1e3 = 1e-4 H = 100 uH<br /> <br /> YOu measure it with a tuning cap. Winding methods and materials for low R and high R vary a lot.<br /> <br /> <div class="bbCodeBlock bbCodeBlock--unfurl js-unfurl fauxBlockLink" data-unfurl="true" data-result-id="214892" data-url="https://eepower.com/resistor-guide/resistor-materials/wirewound-resistor/#" data-host="eepower.com" data-pending="false"> <div class="contentRow"> <div class="contentRow-figure contentRow-figure--fixedSmall js-unfurl-figure"> <img src="https://eepower.com/images/site/og_default.png" alt="eepower.com" data-onerror="hide-parent"/> </div> <div class="contentRow-main"> <h3 class="contentRow-header js-unfurl-title"> <a href="https://eepower.com/resistor-guide/resistor-materials/wirewound-resistor/#" class="link link--external fauxBlockLink-blockLink" target="_blank" rel="nofollow ugc noopener" data-proxy-href=""> Wirewound Resistor | Resistor Materials | Resistor Guide </a> </h3> <div class="contentRow-snippet js-unfurl-desc">What is a Wirewound Resistor? A wirewound resistor is an electrical passive component that limits current. The resistive element is an insulated metallic wire that is wound around a core of…</div> <div class="contentRow-minor contentRow-minor--hideLinks"> <span class="js-unfurl-favicon"> <img src="https://eepower.com/images/favicon.ico" alt="eepower.com" class="bbCodeBlockUnfurl-icon" data-onerror="hide-parent"/> </span> eepower.com </div> </div> </div> </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 href="/threads/inductance-of-wirewound-power-resistors.413111/reply?quote=1784401" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" 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class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784402" data-lb-caption-desc="FvM · Nov 22, 2024 at 6:49 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Arcol is specifying detailed inductance values. The have low inductance and standard types.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> <section class="message-attachments"> <h4 class="block-textHeader">Attachments</h4> <ul class="attachmentList"> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-195496"></a> <a class="file-preview" href="/attachments/techinfo-pdf.195496/" target="_blank"> <span class="file-typeIcon"> <i class="fa--xf fal fa-file-pdf" aria-hidden="true"></i> </span> </a> <div class="file-content"> <div class="file-info"> <span class="file-name" title="techinfo.pdf">techinfo.pdf</span> <div class="file-meta"> 112 KB · Views: 7 </div> </div> </div> </li> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-195497"></a> <a class="file-preview" href="/attachments/hs-series-pdf.195497/" target="_blank"> <span class="file-typeIcon"> <i class="fa--xf fal fa-file-pdf" aria-hidden="true"></i> </span> </a> <div class="file-content"> <div class="file-info"> <span 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wasn't far off but these are the std R's not the low ESL<br /> <div class="bbImageWrapper js-lbImage" title="1732301590393.png" data-src="https://www.edaboard.com/attachments/1732301590393-png.195498/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.edaboard.com/attachments/1732301590393-png.195498/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="1732301590393.png" title="1732301590393.png" width="741" height="344" loading="lazy" /> </div><br /> <div class="kl_amdp_merge_message"> --- Updated <time class="u-dt" dir="auto" datetime="2024-11-22T19:23:07+0000" data-time="1732303387" data-date-string="Nov 22, 2024" data-time-string="7:23 PM" title="Nov 22, 2024 at 7:23 PM">Yesterday at 7:23 PM</time> --- </div><br /> Low ESL concrete resistors are custom.<br /> <br /> A better choice is the ceramic power resistors<br /> <br /> <h4>Tubular Ceramic Resistors</h4><br /> Non-inductive, high voltage, high power tubular resistors are available in a wide range of standard sizes, ceramic materials terminations and mounting hardware. Bulk construction advantageously produces an inherently non-inductive resistor; and it allows energy and power to be uniformly distributed through the entire ceramic resistor body – there is no film or wire to fail.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-22T19:23:07+0000" data-time="1732303387" data-date-string="Nov 22, 2024" data-time-string="7:23 PM" title="Nov 22, 2024 at 7:23 PM" itemprop="dateModified">Yesterday at 7:23 PM</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 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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-1784418" data-lb-caption-desc="FvM · Nov 22, 2024 at 11:09 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Rereading post #1, I want to contradict the statement about thick film resistors. You get planar thick film resistors with kV voltage and multi kW pulse power rating, e.g. from Vishay or TE.</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/inductance-of-wirewound-power-resistors.413111/reply?quote=1784418" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784418/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> 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rel="nofollow noreferrer" target="_blank" class="u-concealed">Melbourne</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"> 27,683 </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-1784447" data-lb-caption-desc="Easy peasy · Nov 23, 2024 at 9:00 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">put some zeners across the Gan ( lots of ) to limit the peak spike - this allows a wider choice of resistors and wiring L.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div 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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/inductance-of-wirewound-power-resistors.413111/", "mainEntity": { "@type": "Question", "@id": "https://www.edaboard.com/threads/inductance-of-wirewound-power-resistors.413111/", "name": "Inductance of wirewound power resistors", "datePublished": "2024-11-22T17:07:45+00:00", "url": "https://www.edaboard.com/threads/inductance-of-wirewound-power-resistors.413111/", "image": "https://mm.digikey.com/Volume0/opasdata/d220001/medias/images/374/4-1625999-8.JPG", "text": "Working on a test jig to take a 400V GaN power device \nto the cyclotron for single event survivability and spurious\ndrain current testing. This voltage swing needs to be fully \nexercised, but my 'scope probes say 300V, yadda yadda.\n\nBetween a resistor divider and a pulse transformer, the\ndivider looks cleaner if a bit slower. Transformer has the\nnice property of being a non-dissipative load but what\nwe specifically want, may be longer lead time than \nremains to the trip.\n\n\"On\" power level says I need 150W resistors and some \nvalues plus high pulsed duty will put me in wirewound.\nThick film values are very limited at this power level.\nLooking specifically at TE Connectivity (looks like used \nto be Ohmite?) FSC150 range. \n\nMy interest in waveform fidelity wants board C and \nresistor L minimized. TE Connectivity datasheet says\n\"low inductance\" but no quantitative info found in \nthe 4 pages of Google hits from \"HSC150\" \"inductance\" \n\"resistor\". Only thing I saw was one thesis where the \nMOSFET load was ringing pretty badly, and wirewound \nresistors were used.\n\nCouldn't find anything quantitative on TE Connectivity\n(was Tyco Electronics) web site.\n\nWhat I'm looking for, is any kind of reasonable rough \ninductance value for a 1Kohm 150W like this guy (one\nof the other divider values):\n\nhttps://www.digikey.com/en/products/detail/te-connectivity-passive-product/HSC1003K9J/5587209\n\nAnybody ever measure, or see a number for this \nkind of wirewound?", "answerCount": 9, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/dick_freebird.159097/", "name": "dick_freebird", "url": "https://www.edaboard.com/members/dick_freebird.159097/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-11-23T09:00:40+00:00", "url": "https://www.edaboard.com/posts/1784447/", "text": "put some zeners across the Gan ( lots of ) to limit the peak spike - this allows a wider choice of resistors and wiring L.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/easy-peasy.573147/", "name": "Easy peasy", "url": "https://www.edaboard.com/members/easy-peasy.573147/" } }, { "@type": "Answer", "datePublished": "2024-11-22T23:09:13+00:00", "url": "https://www.edaboard.com/posts/1784418/", "text": "Rereading post #1, I want to contradict the statement about thick film resistors. You get planar thick film resistors with kV voltage and multi kW pulse power rating, e.g. from Vishay or TE.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/fvm.152255/", "name": "FvM", "url": "https://www.edaboard.com/members/fvm.152255/" } }, { "@type": "Answer", "datePublished": "2024-11-22T18:53:35+00:00", "dateModified": "2024-11-22T19:23:07+00:00", "url": "https://www.edaboard.com/posts/1784403/", "text": "Good find Frank. .My estimate of 100 uH wasn't far off but these are the std R's not the low ESL\n\n1732303387\nLow ESL concrete resistors are custom.\n\nA better choice is the ceramic power resistors\n\nTubular Ceramic Resistors\n\nNon-inductive, high voltage, high power tubular resistors are available in a wide range of standard sizes, ceramic materials terminations and mounting hardware. Bulk construction advantageously produces an inherently non-inductive resistor; and it allows energy and power to be uniformly distributed through the entire ceramic resistor body \u2013 there is no film or wire to fail.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/d-a-tony-stewart.134022/", "name": "D.A.(Tony)Stewart", "url": "https://www.edaboard.com/members/d-a-tony-stewart.134022/" } } ] }, "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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Inductance of wirewound power resistors | Forum for Electronics