{"id":38533,"date":"2026-11-06T19:07:36","date_gmt":"2026-11-06T11:07:36","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/"},"modified":"2026-11-06T19:07:36","modified_gmt":"2026-11-06T11:07:36","slug":"metal-core-pcb-isolation-evidence","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/","title":{"rendered":"Metal Core PCB Isolation: Breakdown vs Hipot vs Working Voltage"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Which_Electrical_Path_Is_Being_Discussed\" >Which Electrical Path Is Being Discussed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#What_Breakdown_Evidence_Means\" >What Breakdown Evidence Means<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Detailed_Parameters_to_Request\" >Detailed Parameters to Request<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Breakdown_vs_Withstand_vs_Working_Voltage\" >Breakdown vs Withstand vs Working Voltage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Example_Read_a_Report_Without_Promoting_It_to_a_Rating\" >Example: Read a Report Without Promoting It to a Rating<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Check_Whether_the_Material_Report_Matches_the_Build\" >Check Whether the Material Report Matches the Build<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Include_the_Metal_Base_in_the_System_Review\" >Include the Metal Base in the System Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Inspect_the_Edge_and_Mounting_Geometry\" >Inspect the Edge and Mounting Geometry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Keep_AC_and_DC_Results_Under_Their_Own_Methods\" >Keep AC and DC Results Under Their Own Methods<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Separate_Thermal_and_Isolation_Decisions\" >Separate Thermal and Isolation Decisions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Identify_Who_Owns_Each_Acceptance_Decision\" >Identify Who Owns Each Acceptance Decision<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Record_What_Would_Trigger_a_New_Review\" >Record What Would Trigger a New Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#Request_a_Construction_Review\" >Request a Construction Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/metal-core-pcb-isolation-evidence\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p>A metal core PCB can have a dielectric breakdown figure, a finished-board withstand test result and an equipment working-voltage requirement. These are not interchangeable. A report that a sample survived a specified test does not set a continuous operating rating for the assembled product.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Which_Electrical_Path_Is_Being_Discussed\"><\/span>Which Electrical Path Is Being Discussed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>On a single-sided insulated metal substrate, dielectric separates the circuit copper from the metal base. Copper-to-base isolation is different from spacing between two top-layer nets. <a href=\"https:\/\/www.bestpcbs.com\/design-guide\/T-guidePart1.pdf\">Thermagon&#8217;s insulated metal substrate guide<\/a> discusses dielectric isolation in different constructions.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/ims-isolation-board.jpg\" width=\"1120\" height=\"573\" style=\"max-width:100%;height:auto\" alt=\"Aluminum-backed board with an exposed metal edge\"><figcaption>AI-generated illustration of construction, not an isolation-tested sample.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Breakdown_Evidence_Means\"><\/span>What Breakdown Evidence Means<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A material breakdown test characterizes failure under a defined test configuration. The number depends on the specimen and method. Check whether the report measured actual breakdown or instead stopped at a leakage threshold; those observations should not be treated as identical.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Detailed_Parameters_to_Request\"><\/span>Detailed Parameters to Request<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Field<\/strong><\/td>\n<td><strong>What to record<\/strong><\/td>\n<td><strong>Purpose<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Sample identity<\/td>\n<td>Material coupon or finished board<\/td>\n<td>Defines evidence scope<\/td>\n<\/tr>\n<tr>\n<td>Electrode or circuit path<\/td>\n<td>Copper to base or another path<\/td>\n<td>Defines what was tested<\/td>\n<\/tr>\n<tr>\n<td>Test type<\/td>\n<td>AC or DC, as specified<\/td>\n<td>Keeps results comparable<\/td>\n<\/tr>\n<tr>\n<td>Condition<\/td>\n<td>Duration, criteria and conditioning<\/td>\n<td>Defines the reported outcome<\/td>\n<\/tr>\n<tr>\n<td>Working requirement<\/td>\n<td>System specification<\/td>\n<td>Separate design input<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Breakdown_vs_Withstand_vs_Working_Voltage\"><\/span>Breakdown vs Withstand vs Working Voltage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Term<\/strong><\/td>\n<td><strong>What it describes<\/strong><\/td>\n<td><strong>What it does not prove<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Breakdown<\/td>\n<td>Failure under the stated test<\/td>\n<td>Continuous use rating<\/td>\n<\/tr>\n<tr>\n<td>Dielectric withstand<\/td>\n<td>Result against a specified test<\/td>\n<td>Long-term performance by itself<\/td>\n<\/tr>\n<tr>\n<td>Working voltage<\/td>\n<td>Voltage in the intended application<\/td>\n<td>Which production screen applies<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Example_Read_a_Report_Without_Promoting_It_to_a_Rating\"><\/span>Example: Read a Report Without Promoting It to a Rating<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Imagine a report records that a bare board passed its specified copper-to-base withstand test. That supports the sampled board or lot only as defined by the test plan. It does not establish the permissible continuous voltage after the board is mounted, wired and enclosed.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Check_Whether_the_Material_Report_Matches_the_Build\"><\/span>Check Whether the Material Report Matches the Build<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ask for the dielectric grade, thickness, foil construction and specimen conditions. A material coupon with generous margins can differ from a finished PCB with cutouts, edges and plated features. Keep material selection evidence separate from production acceptance evidence.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Include_the_Metal_Base_in_the_System_Review\"><\/span>Include the Metal Base in the System Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The equipment design determines whether the base is bonded, exposed, floating or tied to another conductive part. Identify that arrangement in the design record. Do not assume a thermal interface or mounting screw has no electrical significance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Inspect_the_Edge_and_Mounting_Geometry\"><\/span>Inspect the Edge and Mounting Geometry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The shortest relevant path may involve a board edge, fastener, cutout or exposed conductor. Ask the responsible safety engineer to evaluate the assembled geometry and applicable requirements. A laminate coupon does not represent every mechanical interface in a finished enclosure.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Keep_AC_and_DC_Results_Under_Their_Own_Methods\"><\/span>Keep AC and DC Results Under Their Own Methods<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Different waveforms and test setups can produce different observations. Do not apply an informal conversion to replace an approved requirement. Ask for the applicable method and the actual recorded conditions rather than comparing only the largest number in volts.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/ims-withstand-fixture.jpg\" width=\"1120\" height=\"630\" style=\"max-width:100%;height:auto\" alt=\"Insulated metal substrate in a closed test fixture\"><figcaption>AI-generated illustration of testing context, not a procedure or result.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Separate_Thermal_and_Isolation_Decisions\"><\/span>Separate Thermal and Isolation Decisions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A thinner dielectric can change the thermal path, but selection still needs electrical and manufacturing verification. Compare the intended material and construction on both requirements. The <a href=\"https:\/\/www.bestpcbs.com\/faq\/mcpcb\/mcpcb-breakdown-voltage.htm\">BestPCBs metal core PCB resources<\/a> provide a material-test example, not a working-voltage approval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Identify_Who_Owns_Each_Acceptance_Decision\"><\/span>Identify Who Owns Each Acceptance Decision<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The supplier can report material or board test evidence. The equipment team determines the applicable system requirements and verifies the complete build. Keep those records linked, and have qualified personnel conduct any specified high-voltage testing in an approved setup.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Record_What_Would_Trigger_a_New_Review\"><\/span>Record What Would Trigger a New Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A change to the dielectric, mounting, edge clearance or electrical connection can alter what the previous evidence represents. Keep the approved construction and report together. Check whether the existing result still applies rather than inheriting it by board name.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Request_a_Construction_Review\"><\/span>Request a Construction Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Share the stackup, isolation path and applicable test requirements with <a href=\"mailto:sales@bestpcbs.com\">Best Technology<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>Can I use a breakdown figure as the working voltage?<\/h3>\n<p>No. Breakdown characterizes a test specimen under particular conditions. Working voltage belongs to the system design and its applicable requirements, including the assembled construction and environment. Have the responsible engineer verify the equipment instead of deriving a continuous rating from a single material number.<\/p>\n<h3>Does a passed hipot test show that breakdown was measured?<\/h3>\n<p>Not necessarily. A withstand test checks performance against a specified condition and can finish without breakdown. Read the endpoint and criteria on the report. A pass is meaningful for that test, but it is not automatically a measurement of the voltage at which failure occurs.<\/p>\n<h3>Is copper-to-base isolation the same as trace-to-trace spacing?<\/h3>\n<p>No. The first concerns the path between circuitry and the metal base; the second concerns conductors on the circuit side or elsewhere in the assembly. State the path explicitly and evaluate both where relevant. A report for one path does not establish the other.<\/p>\n<h3>Can I compare AC and DC figures directly?<\/h3>\n<p>Not without the applicable specification and method. Waveform, leakage criteria, duration and specimen arrangement affect interpretation. Keep the results identified by their original test conditions and ask the responsible engineer which evidence satisfies the requirement. Do not substitute an informal conversion for a defined test.<\/p>\n<h3>Does the metal base always need to be grounded?<\/h3>\n<p>That is a system design question, not a universal board rule. The required arrangement depends on the equipment architecture and applicable safety requirements. Record how the base is mounted or connected, and have the complete assembly reviewed instead of assuming a generic grounding scheme.<\/p>\n<h3>What if the coupon passes but the assembled board fails?<\/h3>\n<p>Check whether the two tests cover the same electrical path and geometry. The assembly can add fasteners, edges, interfaces or connections absent from a coupon. Preserve the reports and have qualified personnel investigate the difference under the approved procedure rather than repeating tests without a plan.<\/p>\n<h3>Does higher thermal conductivity mean better electrical isolation?<\/h3>\n<p>No. Thermal conductivity and isolation are separate properties, and the finished construction affects both. Compare the actual material and thickness against the thermal and electrical requirements. Do not infer a voltage rating from a thermal property or accept a thermal result as electrical evidence.<\/p>\n<h3>What should a supplier report identify?<\/h3>\n<p>Ask for the construction, sample or lot identity, test path, method, conditions, criteria and outcome. Clarify whether the evidence is from raw material, a qualification specimen or production boards. Keep it tied to the drawing and do not use it outside the scope it represents.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Distinguish material breakdown, finished-board hipot and working voltage on metal core PCBs, and ask for the right evidence before design approval.<\/p>\n","protected":false},"author":32827,"featured_media":38531,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[174],"tags":[9154,9155,9153,9156],"class_list":["post-38533","post","type-post","status-publish","format-standard","hentry","category-bestpcb","tag-dielectric-breakdown","tag-hipot-report","tag-metal-core-pcb-isolation","tag-working-voltage"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Distinguish material breakdown, finished-board hipot and working voltage 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