{"id":20334,"date":"2026-10-29T10:09:23","date_gmt":"2026-10-29T02:09:23","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/dc-dc-module-soldering-cleaning-rework\/"},"modified":"2026-10-29T10:09:23","modified_gmt":"2026-10-29T02:09:23","slug":"dc-dc-module-soldering-cleaning-rework","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/","title":{"rendered":"DC-DC Module Assembly: Verify Soldering, Cleaning and Rework Conditions"},"content":{"rendered":"<div class=\"weho-blog-content\">\n<p class=\"lead\"><strong>Release a DC-DC converter module to production only after its exact package is qualified for the proposed assembly process.<\/strong> Electrical input and output ratings do not establish reflow permission, cleaning compatibility or reuse after removal. Match the manufacturer\u2019s applicable package instructions to the board process, materials and traceable rework history.<\/p>\n<details class=\"article-toc\" open>\n<summary>On this page<\/summary>\n<ol class=\"toc-list\">\n<li><a href=\"#identity-before-process\">Identify the assembly type before discussing temperature<\/a><\/li>\n<li><a href=\"#process-window\">Build a process window from the exact documents<\/a><\/li>\n<li><a href=\"#washing-is-package-specific\">Treat washing as a package-specific decision<\/a><\/li>\n<li><a href=\"#coating-potting\">Assess adhesive, coating and potting separately<\/a><\/li>\n<li><a href=\"#rework-history\">Keep rework history with the module<\/a><\/li>\n<li><a href=\"#manufacturing-change\">Requalify the affected boundary after changes<\/a><\/li>\n<li><a href=\"#request-package-documents\">Request the right manufacturing documents<\/a><\/li>\n<\/ol>\n<\/details>\n<p>This is a manufacturing-release checklist for an OEM evaluating a converter. It does not establish that a WEHO wired converter is a solderable board module, or prescribe one soldering temperature for every package sold as a \u201cDC-DC module.\u201d<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 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\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/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=\"\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u062f\u0647\u06cc\u062f<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Identify_the_assembly_type_before_discussing_temperature\" >Identify the assembly type before discussing temperature<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Build_a_process_window_from_the_exact_documents\" >Build a process window from the exact documents<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Treat_washing_as_a_package-specific_decision\" >Treat washing as a package-specific decision<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Assess_adhesive_coating_and_potting_separately\" >Assess adhesive, coating and potting separately<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Keep_rework_history_with_the_module\" >Keep rework history with the module<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Requalify_the_affected_boundary_after_changes\" >Requalify the affected boundary after changes<\/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.wehopower.com\/fa\/news\/dc-dc-module-soldering-cleaning-rework\/#Request_the_right_manufacturing_documents\" >Request the right manufacturing documents<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"identity-before-process\"><span class=\"ez-toc-section\" id=\"Identify_the_assembly_type_before_discussing_temperature\"><\/span>Identify the assembly type before discussing temperature<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Record the complete part number, suffix, package drawing, terminal finish and manufacturer document identity. A through-hole pin module, a surface-mount package and an enclosed unit with leads can require entirely different attachment methods. Similar voltage ratings or body dimensions do not make their manufacturing instructions interchangeable.<\/p>\n<p>For a concrete scope check, the <a href=\"https:\/\/www.wehopower.com\/fa\/product\/dc-dc-buck-converter-24v-to-12v-5a\/\">WEHO WH-C241205 product information<\/a> and <a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2025\/06\/WH-C241205.pdf\">model sheet<\/a> describe a fully sealed converter with external input\/output leads. That is a different assembly identity from the solder-down packages discussed in the manufacturing examples below. The reviewed WEHO documents do not supply a PCB reflow profile or a cleaning\/rework process for this product. Request instructions for the actual termination and material exposure instead of applying a different module\u2019s process to the pictured unit.<\/p>\n<figure class=\"product-reference\" id=\"figure-product-wh5-full\"><a class=\"product-image\" href=\"https:\/\/www.wehopower.com\/fa\/product\/dc-dc-buck-converter-24v-to-12v-5a\/\" aria-label=\"WH-C241205 product details\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-product-wh5-full-display.svg\" width=\"955\" height=\"625\" alt=\"DC-DC Module Assembly: Verify Soldering, Cleaning and Rework Conditions  title=\" dc-dc module assembly: verify cleaning and rework conditions title =\"\"><\/a><figcaption>WH-C241205 product appearance reference, mapped to its exact product page and model sheet. External leads and enclosure do not establish PCB reflow, washing, coating or rework permission.<\/figcaption><div class=\"image-actions\"><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-product-wh5-full-original.jpg\">View unchanged original photograph<\/a><a href=\"https:\/\/www.wehopower.com\/fa\/product\/dc-dc-buck-converter-24v-to-12v-5a\/\">WH-C241205 product details<\/a><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2025\/06\/WH-C241205.pdf\">WH-C241205 documentation<\/a><\/div>\n<\/figure>\n<p><a href=\"https:\/\/www.vicorpower.com\/documents\/application_notes\/ap_pi31xx_soldering_guidelines.pdf\" target=\"_blank\" rel=\"noopener\">Vicor\u2019s PI31xx AN:302<\/a> is explicitly a family-specific reflow guide. It discusses storage, board considerations, reflow, inspection and rework for the covered products. Its existence shows the kind of controlled manufacturing information to obtain; its profile and process limits are not specifications for another converter.<\/p>\n<figure class=\"article-relation concept-diagram\" id=\"figure-assembly-release-path\"><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-assembly-release-path.svg\" aria-label=\"Open full-size Release the package and the process together diagram\"><picture><source media=\"(max-width:640px)\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-assembly-release-path-mobile.svg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-assembly-release-path.svg\" width=\"1200\" height=\"409\" alt=\"DC-DC Module Assembly: Verify Soldering, Cleaning and Rework Conditions  title=\" dc-dc module assembly: verify cleaning and rework conditions title =\"\"><\/picture><\/a><figcaption>Concept manufacturing review sequence. No soldering temperature, wash recipe, measured profile or WEHO factory process is represented.<\/figcaption><a class=\"diagram-original\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/65-assembly-release-path.svg\">Open full-size diagram<\/a><\/figure>\n<h2 id=\"process-window\"><span class=\"ez-toc-section\" id=\"Build_a_process_window_from_the_exact_documents\"><\/span>Build a process window from the exact documents<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ask which attachment methods are permitted and which measurements define their limits. An oven\u2019s programmed temperature is not automatically the module-case or solder-joint temperature. The board\u2019s thermal mass, nearby components and fixture can change the profile seen by the module.<\/p>\n<p>Prepare a representative assembly and instrument the locations required by its instructions. Compare the recorded process against the applicable limits for peak, time, ramp behavior and number of exposures. Keep the measured profile, board revision, process recipe and material identities together so a production change can be assessed against the original release.<\/p>\n<div class=\"table-wrap\">\n<div class=\"weho-table-wrap\" tabindex=\"0\" role=\"region\" aria-label=\"Scrollable article table\">\n<table>\n<thead>\n<tr>\n<th>Release field<\/th>\n<th>Record for the exact module<\/th>\n<th>Evidence to retain<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Package and finish<\/td>\n<td>Part\/suffix, footprint, terminal finish and permitted attachment method<\/td>\n<td>Applicable drawing and assembly instruction<\/td>\n<\/tr>\n<tr>\n<td>Thermal process<\/td>\n<td>Required measurement locations and permitted temperature\/time history<\/td>\n<td>Recorded profile on the representative assembly<\/td>\n<\/tr>\n<tr>\n<td>Moisture handling<\/td>\n<td>Applicable storage, exposure tracking and conditioning requirements<\/td>\n<td>Lot handling and approved conditioning record<\/td>\n<\/tr>\n<tr>\n<td>Cleaning and finishing<\/td>\n<td>Flux, wash chemistry, drying, adhesive or coating process<\/td>\n<td>Compatibility evidence and qualified process configuration<\/td>\n<\/tr>\n<tr>\n<td>Inspection and rework<\/td>\n<td>Joint\/package acceptance, removal\/replacement permission and exposure history<\/td>\n<td>Inspection results and serial\/lot traceability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>Do not replace missing process information with a temperature taken from a neighboring component\u2019s datasheet. Escalate the affected operation until the supplier identifies the applicable conditions. Other design work can continue, but the unsupported manufacturing step should not silently become the default factory recipe.<\/p>\n<h2 id=\"washing-is-package-specific\"><span class=\"ez-toc-section\" id=\"Treat_washing_as_a_package-specific_decision\"><\/span>Treat washing as a package-specific decision<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Different manufacturer instructions can lead to different answers. The <a href=\"https:\/\/www.vicorpower.com\/documents\/applications_manual\/DesignGuideAppsManual_200J00.pdf\" target=\"_blank\" rel=\"noopener\">Vicor VI-200\/VI-J00 guide, section 22<\/a> restricts liquid exposure of the covered modules and discusses a socket-based sequence where a board requires washing. That is a restriction for its scope, not a universal statement that all power modules are unwashable.<\/p>\n<p>By contrast, <a href=\"https:\/\/edit.vicorpower.com\/documents\/application_notes\/vichip_appnote9.pdf\" target=\"_blank\" rel=\"noopener\">Vicor AN:009 for SMT J-lead VI Chip packages<\/a> discusses compatible water-wash procedures, residue-related reliability concerns and solvent compatibility review. These different package instructions are exactly why an assembler should not rely on a generic \u201csealed\u201d or \u201cno-clean\u201d description.<\/p>\n<p>Identify chemistry, concentration, bath temperature, duration, pressure or agitation, rinse and drying as applicable to the proposed process. Ask the supplier about the exact combination rather than requesting a broad \u201cwashable\u201d label. Include any later heating operation in the assessment because processing can change the package\u2019s moisture condition.<\/p>\n<h2 id=\"coating-potting\"><span class=\"ez-toc-section\" id=\"Assess_adhesive_coating_and_potting_separately\"><\/span>Assess adhesive, coating and potting separately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A wash-compatible package is not automatically compatible with an adhesive, conformal coating or potting compound. Material contact, curing conditions, thermal effects and any interaction with openings or movable components need a defined review. A supplier\u2019s generic operating-temperature range does not approve the curing process.<\/p>\n<p><a href=\"https:\/\/www.murata.com\/products\/power\/requirements\" target=\"_blank\" rel=\"noopener\">Murata\u2019s power-products operating requirements<\/a> include material\/environment cautions and identify a particular silicone-related concern. That supports asking for material compatibility; it does not establish a universal recipe or approve a chemical for WEHO products. Provide the actual material datasheet and process conditions to the responsible manufacturer.<\/p>\n<h2 id=\"rework-history\"><span class=\"ez-toc-section\" id=\"Keep_rework_history_with_the_module\"><\/span>Keep rework history with the module<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Distinguish touch-up of a joint, a neighboring-component repair, module removal and module reuse. Each can impose a different thermal or mechanical history. Permission for initial attachment does not establish permission for all subsequent operations. Follow the exact package\u2019s rework instructions and document any restriction on reusing removed parts.<\/p>\n<p>For a hypothetical traveler, module A undergoes its original attachment and later experiences two additional board heating events during repairs. Record three events, their relevant measured conditions and the package\u2019s applicable allowance. The count alone does not prove that three are permitted, that all events are equivalent, or that the part remains acceptable.<\/p>\n<p>If an event was not recorded, do not reset its history by assigning a new board serial number. Isolate the affected assembly for a documented disposition. A functional output check can be useful, but it is not by itself evidence that an unqualified thermal or mechanical exposure caused no latent damage.<\/p>\n<h2 id=\"manufacturing-change\"><span class=\"ez-toc-section\" id=\"Requalify_the_affected_boundary_after_changes\"><\/span>Requalify the affected boundary after changes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Review changes to module suffix, terminal finish, board copper, solder material, fixture, oven, wash chemistry or finishing compound against the released process. Retain the evidence that supports the change and repeat the affected verification. A supplier substitution should not inherit the previous module\u2019s assembly approval from matching electrical ratings.<\/p>\n<p>Use inspection criteria and electrical tests appropriate to the part and application, with the manufacturer\u2019s specified methods. Record acceptance and rejected conditions consistently. A cosmetic photograph alone is not a complete solder-joint or package-integrity assessment, and an illustrative process flow is not a temperature profile.<\/p>\n<h2 id=\"request-package-documents\"><span class=\"ez-toc-section\" id=\"Request_the_right_manufacturing_documents\"><\/span>Request the right manufacturing documents<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Send WEHO the proposed converter identity, attachment concept, board\/process information and planned washing, coating or rework operations. First confirm whether that product format supports the intended assembly method, then request the applicable package and processing documents. Keep unresolved steps visible in the manufacturing release record.<\/p>\n<p><a class=\"primary-cta\" href=\"https:\/\/www.wehopower.com\/fa\/contact\/\" data-link-role=\"inquiry\">Discuss the converter format and assembly requirements<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Electrical ratings do not authorize a module for a factory\u2019s soldering, washing or rework process.<\/p>","protected":false},"author":2,"featured_media":20320,"parent":0,"menu_order":30,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-20334","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news\/20334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/comments?post=20334"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news\/20334\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/media\/20320"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/media?parent=20334"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news_category?post=20334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}