{"id":38564,"date":"2026-11-06T20:31:08","date_gmt":"2026-11-06T12:31:08","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/led-mcpcb-solder-point-temperature\/"},"modified":"2026-11-06T20:31:08","modified_gmt":"2026-11-06T12:31:08","slug":"led-mcpcb-solder-point-temperature","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/led-mcpcb-solder-point-temperature\/","title":{"rendered":"LED MCPCB Solder-Point Temperature: Use the Right Reference"},"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\/led-mcpcb-solder-point-temperature\/#Identify_the_temperature_reference_on_the_drawing\" >Identify the temperature reference on the drawing<\/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\/led-mcpcb-solder-point-temperature\/#Record_the_parameters_before_powering_the_test\" >Record the parameters before powering the test<\/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\/led-mcpcb-solder-point-temperature\/#Estimate_junction_temperature_from_the_example\" >Estimate junction temperature from the example<\/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\/led-mcpcb-solder-point-temperature\/#Compare_solder_point_metal_base_and_ambient\" >Compare solder point, metal base and ambient<\/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\/led-mcpcb-solder-point-temperature\/#Use_the_suppliers_power_convention\" >Use the supplier&#8217;s power convention<\/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\/led-mcpcb-solder-point-temperature\/#Place_the_sensor_without_changing_the_feature\" >Place the sensor without changing the feature<\/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\/led-mcpcb-solder-point-temperature\/#Check_how_the_sensor_affects_the_reading\" >Check how the sensor affects the reading<\/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\/led-mcpcb-solder-point-temperature\/#Measure_in_the_relevant_assembly_state\" >Measure in the relevant assembly state<\/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\/led-mcpcb-solder-point-temperature\/#Keep_board_comparisons_on_the_same_reference\" >Keep board comparisons on the same reference<\/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\/led-mcpcb-solder-point-temperature\/#Interpret_uncertainty_before_claiming_margin\" >Interpret uncertainty before claiming margin<\/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\/led-mcpcb-solder-point-temperature\/#Know_when_the_estimate_does_not_apply\" >Know when the estimate does not apply<\/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\/led-mcpcb-solder-point-temperature\/#Hand_off_the_evidence_with_the_thermal_review\" >Hand off the evidence with the thermal 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\/led-mcpcb-solder-point-temperature\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p>An LED&#8217;s solder-point or sensor-pad temperature is only useful for estimating junction temperature if it is measured at the location associated with the published thermal resistance. A nearby metal-base reading is not a substitute. Match the LED part, the reference location and the supplier&#8217;s power convention before calculating the junction estimate.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/led-mcpcb-reference-pad.jpg\" width=\"1120\" height=\"630\" style=\"max-width:100%;height:auto\" alt=\"Thermocouple bead near an LED reference pad\"><figcaption>Thermocouple bead near an LED reference pad. AI-generated illustration, not a measurement or production record.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Identify_the_temperature_reference_on_the_drawing\"><\/span>Identify the temperature reference on the drawing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Manufacturers may define a solder point, case reference, or dedicated sensor pad. Locate it in the application documentation for the exact package. <a href=\"https:\/\/lumileds.com\/company\/blog\/how-to-measure-thermal-resistance-of-led-emitters-and-led-arrays\/\">Lumileds&#8217; measurement white paper<\/a> explains why the solder reference and case reference are not necessarily the same.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Record_the_parameters_before_powering_the_test\"><\/span>Record the parameters before powering the test<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A measurement sheet should make the estimate repeatable.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Parameter<\/strong><\/td>\n<td><strong>Record<\/strong><\/td>\n<td><strong>Example only<\/strong><\/td>\n<\/tr>\n<tr>\n<td>LED<\/td>\n<td>Exact part and revision<\/td>\n<td>Package-specific<\/td>\n<\/tr>\n<tr>\n<td>Reference temperature<\/td>\n<td>\u00b0C and sensor coordinates<\/td>\n<td>68<\/td>\n<\/tr>\n<tr>\n<td>Junction-to-reference resistance<\/td>\n<td>\u00b0C\/W, matching definition<\/td>\n<td>6<\/td>\n<\/tr>\n<tr>\n<td>Power<\/td>\n<td>W on the specified basis<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Assembly state<\/td>\n<td>Sink, interface and airflow<\/td>\n<td>Intended enclosure condition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Estimate_junction_temperature_from_the_example\"><\/span>Estimate junction temperature from the example<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For the illustrative compatible values, add the product of 6 \u00b0C\/W and 2 W to 68 \u00b0C. The estimate is 80 \u00b0C. The example is not a component rating, and the power term must follow the manufacturer&#8217;s convention for the published resistance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Compare_solder_point_metal_base_and_ambient\"><\/span>Compare solder point, metal base and ambient<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>These temperatures describe different parts of the assembly.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Location<\/strong><\/td>\n<td><strong>Useful for<\/strong><\/td>\n<td><strong>Cannot replace<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Specified solder or sensor point<\/td>\n<td>Junction estimate with matching resistance<\/td>\n<td>Direct junction measurement<\/td>\n<\/tr>\n<tr>\n<td>Metal base or heat sink<\/td>\n<td>Comparing assembly heat paths<\/td>\n<td>Package-specific sensor reference<\/td>\n<\/tr>\n<tr>\n<td>Ambient<\/td>\n<td>Defining external operating condition<\/td>\n<td>Board or package temperature<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Use_the_suppliers_power_convention\"><\/span>Use the supplier&#8217;s power convention<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Some manufacturer methods pair their published resistance with electrical input power. Others distinguish thermal power and emitted optical power. Do not independently subtract optical power or use electrical power by default; use the convention that accompanies the exact resistance value.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Place_the_sensor_without_changing_the_feature\"><\/span>Place the sensor without changing the feature<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Follow the supplier&#8217;s approved sensing location and attachment method. A bead on solder mask or an adjacent pad may not read the intended reference. Keep the sensor and leads from altering electrical clearance, thermal contact or the optical path.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/led-mcpcb-thermal-bench.jpg\" width=\"1120\" height=\"630\" style=\"max-width:100%;height:auto\" alt=\"LED metal-core board on a heat sink at a thermal test bench\"><figcaption>LED metal-core board on a heat sink at a thermal test bench. AI-generated illustration, not a measurement or production record.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Check_how_the_sensor_affects_the_reading\"><\/span>Check how the sensor affects the reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lead routing, attachment and sensor contact can influence the measurement. Document placement with a photo and check repeatability across equivalent samples. If the method requires a special test board or mounting procedure, reproduce that condition instead of improvising.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Measure_in_the_relevant_assembly_state\"><\/span>Measure in the relevant assembly state<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use the specified drive, airflow, mounting and interface condition. An LED on an open bench can run at a different temperature from the installed module. Record stabilization or the required timing so short transients are not mistaken for steady operation.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Keep_board_comparisons_on_the_same_reference\"><\/span>Keep board comparisons on the same reference<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When comparing two MCPCBs, preserve the LED package, drive and sensor location. If the mount or heat sink also changes, the result compares two complete assemblies. Use the <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/mcpcb-stackup\/\">BestPCBs MCPCB stackup guide<\/a> for the separate heat-path selection question.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Interpret_uncertainty_before_claiming_margin\"><\/span>Interpret uncertainty before claiming margin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A small apparent temperature advantage can be less than placement or measurement variation. Repeat the test and document the resistance tolerance or typical-value limitation. Avoid reporting an estimated junction temperature with more precision than its inputs support.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Know_when_the_estimate_does_not_apply\"><\/span>Know when the estimate does not apply<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do not use a steady-state resistance calculation to interpret an arbitrary short pulse. Follow the component documentation for transient operation. If the package reference or power basis cannot be matched, report the measured temperature and the unresolved limitation separately.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hand_off_the_evidence_with_the_thermal_review\"><\/span>Hand off the evidence with the thermal review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Keep the LED part, reference drawing, sensor photo, drive power, stabilization record and mounting details together. Send the stackup and verification requirements to Best Technology at <a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a> for a manufacturing review.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>Can I measure the aluminum back and call it solder-point temperature?<\/h3>\n<p>No. The metal back is a different location, separated by part of the heat path. Use it to evaluate the assembly or compare mounts, but apply a junction-to-solder resistance only to its specified reference. Record both temperatures separately if both are useful.<\/p>\n<h3>Does an infrared image replace the thermocouple method?<\/h3>\n<p>Not automatically. Surface emissivity, reflections and spatial resolution can influence the camera result. Use the approved method for the defined point. An image can help locate gradients but cannot be assumed to reproduce a package-specific reference reading under all surface conditions.<\/p>\n<h3>Can I use a resistance value from another LED in the same footprint?<\/h3>\n<p>Do not assume it transfers. Package internals, thermal path and reference definitions can differ even with the same footprint. Use the correct part documentation and verify any supplier-approved alternative. A similar board land pattern does not establish the same temperature estimate.<\/p>\n<h3>Is the calculated result an exact junction measurement?<\/h3>\n<p>No. It is an estimate built from the reference temperature, resistance and power convention. Its accuracy depends on the applicability of the resistance and on how the measurement was taken. Keep uncertainty and any typical-value assumptions with the reported result for review.<\/p>\n<h3>Should I use the maximum junction rating as the design target?<\/h3>\n<p>An absolute limit is not automatically an operating target. Use the device and system requirements for the expected lifetime and conditions. Compare your estimate and its uncertainty with the approved design margin rather than aiming to operate exactly at the published maximum.<\/p>\n<h3>Can I take a reading immediately after switch-on?<\/h3>\n<p>Only if the test specifically calls for that transient condition and uses the corresponding method. A steady-state estimate needs a relevant stabilized reading. Record the drive duration and response so a cold-start value is not compared with a settled installed condition.<\/p>\n<h3>Does a colder metal base always mean a colder junction?<\/h3>\n<p>Not necessarily. The difference between the junction and the base depends on the package, board and interfaces. A cooler base is useful information but does not prove the junction changed by the same amount. Compare the specified reference under matched operating conditions.<\/p>\n<h3>What if I cannot access the specified pad?<\/h3>\n<p>Document the restriction and ask for an approved alternate method or a representative test coupon. Do not silently substitute a nearby surface and keep the original resistance value. A result with an unverified reference should be labeled as such rather than used for release.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Measure LED solder-point temperature at the specified MCPCB reference, then use matching thermal resistance and power to estimate junction temperature.<\/p>\n","protected":false},"author":32827,"featured_media":38562,"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":[9175,34,9176,9177],"class_list":["post-38564","post","type-post","status-publish","format-standard","hentry","category-bestpcb","tag-led-thermal-design","tag-mcpcb","tag-solder-point-temperature","tag-thermocouple"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Measure LED solder-point temperature at the specified MCPCB 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