{"id":33738,"date":"2026-08-17T21:33:44","date_gmt":"2026-08-17T13:33:44","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=33738"},"modified":"2026-08-17T21:33:44","modified_gmt":"2026-08-17T13:33:44","slug":"pcb-supplier-change-notification-pcn-approval-checklist","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/","title":{"rendered":"PCB Supplier Change Notification Checklist for Process Changes"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#What_a_PCB_Supplier_Must_Notify_Before_Making_a_Change\" >What a PCB Supplier Must Notify Before Making a Change<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#PCB_Change_Triggers_That_Require_Customer_Review\" >PCB Change Triggers That Require Customer Review<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#PCN_ECO_Deviation_and_SCAR_Do_Not_Mix_the_Records\" >PCN, ECO, Deviation and SCAR: Do Not Mix the Records<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Set_Notice_Timing_by_Contract_and_Risk_Not_One_Universal_Number\" >Set Notice Timing by Contract and Risk, Not One Universal Number<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Required_Fields_in_a_PCB_Supplier_PCN_Template\" >Required Fields in a PCB Supplier PCN Template<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Assess_Form_Fit_Function_Reliability_and_Supply_Impact\" >Assess Form, Fit, Function, Reliability and Supply Impact<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Route_the_PCN_Through_Engineering_Quality_and_Purchasing_Approval\" >Route the PCN Through Engineering, Quality and Purchasing Approval<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Define_Qualification_Evidence_Before_Approving_the_Change\" >Define Qualification Evidence Before Approving the Change<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Control_Effectivity_Existing_Inventory_and_the_First_Changed_Lot\" >Control Effectivity, Existing Inventory and the First Changed Lot<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#Put_Change-Notification_Rules_Into_the_PCB_Quality_Agreement\" >Put Change-Notification Rules Into the PCB Quality Agreement<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#What_to_Send_EBest_Circuit_for_a_Controlled_PCB_Change_Review\" >What to Send EBest Circuit for a Controlled PCB Change Review<\/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\/08\/pcb-supplier-change-notification-pcn-approval-checklist\/#FAQ_About_PCB_Supplier_Change_Notifications\" >FAQ About PCB Supplier Change Notifications<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><style id=\"ebest-pcn-readability\">h1._title{word-break:normal!important;overflow-wrap:normal!important;white-space:normal!important;hyphens:none!important;}.ebest-pcn h2{word-break:normal!important;overflow-wrap:normal!important;white-space:normal!important;hyphens:none!important;}.ebest-pcn .ebest-inline-cta__button:not(.ebest-inline-cta__button--primary){background:#fff!important;color:#0b4f8a!important;border:2px solid #fff!important;}@media(max-width:767px){.ebest-pcn p,.ebest-pcn li,.ebest-pcn td{text-align:left!important;}}<\/style>\n<div class=\"ebest-pcn\">\n<figure style=\"max-width:1200px;margin:0 auto 28px;\"><img src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/pcb-supplier-change-notification-hero.jpg\" alt=\"Supplier and customer engineers reviewing PCB process change notification samples\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0 auto;\"><figcaption>A useful PCB supplier change notification gives the customer enough time and evidence to assess risk before the changed product enters a shipment.<\/figcaption><\/figure>\n<p><strong>A PCB supplier change notification (PCN) is the controlled notice a PCB or PCBA supplier sends before changing an approved material, process, site, equipment route, subcontractor or product configuration.<\/strong> It should describe the current and proposed states, affected items, reason, risk, qualification evidence, implementation boundary and requested customer decision.<\/p>\n<p>The goal is not to generate more paperwork. It is to prevent an apparently minor supplier change from altering impedance, solderability, reliability, compliance, traceability, assembly behavior or long-term availability without the customer knowing which lots are affected.<\/p>\n<div class=\"pcbask\">\n<p><strong>Would your team learn about a material, factory or process change before the first changed PCB lot ships\u2014or only after a quality problem?<\/strong><\/p>\n<p>If the purchase order and quality agreement do not define notification triggers, timing and approval authority, both customer and supplier may assume the other party owns the decision.<\/p>\n<\/div>\n<div class=\"pcbserviec\">\n<p><strong>EBest Circuit can review project-specific PCB\/PCBA change requirements and affected manufacturing data.<\/strong><\/p>\n<p>Send the controlled Gerber\/ODB++, drawing, stackup, BOM\/CPL if applicable, approved material\/process requirements, quantity, validation needs and required notice\/approval rules. Final feasibility and evidence depend on the released construction and change scope.<\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_a_PCB_Supplier_Must_Notify_Before_Making_a_Change\"><\/span>What a PCB Supplier Must Notify Before Making a Change<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A supplier should notify changes that can affect the approved definition, manufacturing route, product performance, acceptance evidence or continuity of supply. The exact trigger list belongs in the purchase agreement, drawing, specification or supplier-quality agreement; it should not depend on one salesperson deciding whether a change seems important.<\/p>\n<p>Notification does not automatically mean rejection. It creates a review gate so engineering, quality and purchasing can decide whether the change is equivalent, needs evidence, requires a limited qualification build or cannot be accepted.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"PCB_Change_Triggers_That_Require_Customer_Review\"><\/span>PCB Change Triggers That Require Customer Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"overflow-x:auto;max-width:100%;\">\n<figure class=\"wp-block-table\" style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\">\n<table style=\"width:100%;min-width:820px;\">\n<thead>\n<tr>\n<th>Change area<\/th>\n<th>PCB\/PCBA examples<\/th>\n<th>Customer question<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Material<\/td>\n<td>Laminate, prepreg, copper foil, solder mask, surface finish chemistry, adhesive or approved component source<\/td>\n<td>Does form, fit, function, reliability or compliance change?<\/td>\n<\/tr>\n<tr>\n<td>Process or equipment<\/td>\n<td>Lamination route, drilling\/plating method, imaging, cleaning, soldering, rework, test or inspection method<\/td>\n<td>Is the output still controlled to the approved requirement?<\/td>\n<\/tr>\n<tr>\n<td>Site or ownership<\/td>\n<td>Factory move, new line, merger, tooling transfer or different manufacturing entity<\/td>\n<td>Does qualification and traceability remain valid?<\/td>\n<\/tr>\n<tr>\n<td>Subcontractor<\/td>\n<td>New outside finish, special process, bare-board source or assembly partner<\/td>\n<td>Who controls the external process and its records?<\/td>\n<\/tr>\n<tr>\n<td>Design\/configuration<\/td>\n<td>Stackup, panel, marking, BOM alternate, firmware or test limit proposed by the supplier<\/td>\n<td>Who has design authority to approve it?<\/td>\n<\/tr>\n<tr>\n<td>Supply status<\/td>\n<td>Discontinuance, allocation, EOL material or emergency substitution<\/td>\n<td>What inventory and transition plan protects continuity?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"PCN_ECO_Deviation_and_SCAR_Do_Not_Mix_the_Records\"><\/span>PCN, ECO, Deviation and SCAR: Do Not Mix the Records<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A PCN starts with the supplier and asks the customer to review a proposed product or process change. An engineering change order usually authorizes a customer-controlled design change. A deviation requests temporary permission to depart from an approved requirement. A supplier corrective action request (SCAR) addresses a failure and asks for root cause and corrective action.<\/p>\n<p>One issue may require several linked records, but each has a different decision. The <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/pcb-engineering-change-order-eco-release-checklist\/\">PCB engineering change order checklist<\/a> covers customer-originated design release; this page controls supplier-originated change notice and approval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Set_Notice_Timing_by_Contract_and_Risk_Not_One_Universal_Number\"><\/span>Set Notice Timing by Contract and Risk, Not One Universal Number<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>There is no single notice period that fits every PCB program.<\/strong> Define the required advance notice in the contract or quality agreement and align it with qualification time, inventory exposure, regulatory\/customer approval and supply continuity. A high-reliability material or site change may need more review than a documentation correction.<\/p>\n<p>Emergency changes caused by obsolescence, disaster or sudden material unavailability still require prompt disclosure, containment and an agreed interim plan. \u201cEmergency\u201d should not silently turn a proposed substitution into an approved change.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Required_Fields_in_a_PCB_Supplier_PCN_Template\"><\/span>Required Fields in a PCB Supplier PCN Template<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"overflow-x:auto;max-width:100%;\">\n<figure class=\"wp-block-table\" style=\"overflow-x:auto;-webkit-overflow-scrolling:touch;\">\n<table style=\"width:100%;min-width:820px;\">\n<thead>\n<tr>\n<th>PCN field<\/th>\n<th>Minimum useful content<\/th>\n<th>Approval value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Identity<\/td>\n<td>PCN number, supplier site, customer, affected part numbers\/revisions and contacts<\/td>\n<td>Creates traceability<\/td>\n<\/tr>\n<tr>\n<td>Current vs proposed state<\/td>\n<td>Specific before\/after material, process, site, source or configuration<\/td>\n<td>Shows the real difference<\/td>\n<\/tr>\n<tr>\n<td>Reason and risk<\/td>\n<td>Driver, urgency, known effects and potential failure modes<\/td>\n<td>Supports priority and depth<\/td>\n<\/tr>\n<tr>\n<td>Affected scope<\/td>\n<td>Orders, inventory, WIP, finished lots and related products<\/td>\n<td>Defines containment<\/td>\n<\/tr>\n<tr>\n<td>Qualification<\/td>\n<td>Test plan, comparison data, samples and acceptance criteria<\/td>\n<td>Makes equivalence observable<\/td>\n<\/tr>\n<tr>\n<td>Effectivity<\/td>\n<td>Proposed date, PO, lot, date code or serial boundary<\/td>\n<td>Prevents mixed shipments<\/td>\n<\/tr>\n<tr>\n<td>Decision<\/td>\n<td>Approve, reject, request evidence, limited approval or deviation<\/td>\n<td>Records authority and conditions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Assess_Form_Fit_Function_Reliability_and_Supply_Impact\"><\/span>Assess Form, Fit, Function, Reliability and Supply Impact<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Review the change against the released requirement, not only the supplier\u2019s statement that it is \u201cequivalent.\u201d Check physical dimensions and interfaces, electrical behavior, thermal\/mechanical performance, process compatibility, solderability, impedance, environmental\/compliance documentation, inspection\/test coverage, marking, traceability and service interchangeability.<\/p>\n<p>Also review business impact: new tooling, MOQ, price, lead time, lifecycle, remaining old stock and the risk of splitting production between old and new states. A technically acceptable change can still create an uncontrolled supply transition.<\/p>\n<figure style=\"max-width:1200px;margin:28px auto;\"><img src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/pcb-pcn-impact-approval-flow.jpg\" alt=\"PCB supplier material process site and component changes routed through approval and validation\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\" style=\"display:block;width:100%;max-width:100%;height:auto;\"><figcaption>Material, process, site, subcontractor and component changes should converge at one controlled impact review before qualification and the first changed lot.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Route_the_PCN_Through_Engineering_Quality_and_Purchasing_Approval\"><\/span>Route the PCN Through Engineering, Quality and Purchasing Approval<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Engineering assesses design and performance impact. Quality defines qualification, traceability and acceptance evidence. Purchasing assesses price, inventory, continuity and contract terms. Regulatory or customer-program owners join when their requirements are affected. Assign one coordinator and one final authority rather than collecting disconnected email opinions.<\/p>\n<p>Record open questions, owner, due date and disposition. The supplier should not implement the changed state until the required decision is issued, unless a documented emergency\/deviation path explicitly authorizes it.<\/p>\n<div class=\"ebest-inline-cta\" role=\"complementary\" aria-label=\"PCB supplier PCN review\">\n<div class=\"ebest-inline-cta__inner\">\n<p class=\"ebest-inline-cta__title\">Make the change review specific to the released PCB.<\/p>\n<p class=\"ebest-inline-cta__text\">Send the proposed before\/after state, affected part\/revision, current orders and required evidence. EBest Circuit can clarify manufacturing impact, validation questions and an implementation boundary for the project.<\/p>\n<div class=\"ebest-inline-cta__actions\" style=\"display:flex;flex-wrap:wrap;gap:12px;\"><a class=\"ebest-inline-cta__button ebest-inline-cta__button--primary\" style=\"flex:1 1 240px;\" href=\"mailto:sales@bestpcbs.com?subject=PCB%20Supplier%20PCN%20Review\">Request a PCN Review<\/a><a class=\"ebest-inline-cta__button\" style=\"flex:1 1 240px;\" href=\"mailto:sales@bestpcbs.com?subject=Changed%20PCB%20Manufacturing%20Quote\">Quote the Changed Scope<\/a><\/div>\n<p class=\"ebest-inline-cta__note\">Before\/After | Parts | Lots | Evidence | Approval | Effectivity<\/p>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Define_Qualification_Evidence_Before_Approving_the_Change\"><\/span>Define Qualification Evidence Before Approving the Change<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Evidence should target the changed risk. A material\/stackup change may require updated construction, impedance or reliability review. A finish or soldering-process change may require solderability, microsection, profile or assembly evidence. A site\/equipment transfer may require first-article comparison and process capability evidence. A component-source change may need authenticity, package, electrical, lifecycle and functional review.<\/p>\n<p>Define sample size, method, limits and records before testing. Use the <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/pcb-testing\/\">PCB testing guide<\/a> to distinguish bare-board from assembly evidence, and use the <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/pcb-supplier-audit-checklist-factory-qualification\/\">PCB supplier audit checklist<\/a> when the change also affects site or process qualification.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Control_Effectivity_Existing_Inventory_and_the_First_Changed_Lot\"><\/span>Control Effectivity, Existing Inventory and the First Changed Lot<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Approval should state which lot, date code, PO or serial number first uses the change. Identify old material, WIP and finished inventory, then decide whether it may be used, segregated, returned, reworked or exhausted under a controlled boundary. Require the first changed lot to carry the agreed identification and evidence package.<\/p>\n<p>After approval, update drawings, specifications, approved-source records, incoming inspection and supplier records. Monitor early lots for the failure modes considered in the impact assessment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Put_Change-Notification_Rules_Into_the_PCB_Quality_Agreement\"><\/span>Put Change-Notification Rules Into the PCB Quality Agreement<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>define product\/material\/process\/site\/subsupplier and supply-status triggers;<\/li>\n<li>state the required advance notice or emergency escalation path;<\/li>\n<li>name customer and supplier contacts plus approval authority;<\/li>\n<li>prohibit implementation before required approval;<\/li>\n<li>define PCN fields, evidence, sample and document format;<\/li>\n<li>set effectivity, inventory, traceability and first-lot rules;<\/li>\n<li>define what happens when a change is implemented without notice;<\/li>\n<li>require flow-down to relevant sub-tier suppliers.<\/li>\n<\/ul>\n<p>The <a href=\"https:\/\/www.bestpcbs.com\/blog\/custom-pcb-supplier\/\">custom PCB supplier guide<\/a> helps connect these controls to RFQ and supplier selection.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_to_Send_EBest_Circuit_for_a_Controlled_PCB_Change_Review\"><\/span>What to Send EBest Circuit for a Controlled PCB Change Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Send the affected PCB\/PCBA part and revision, current and proposed state, reason, target timing, open orders, inventory\/WIP status and required approval process. Include Gerber\/ODB++, fabrication drawing, stackup and material\/finish requirements; add BOM, CPL, assembly drawing, test and programming data for PCBA.<\/p>\n<p>State the validation evidence you require and whether any customer, regulatory or service approval is involved. EBest Circuit can review project-specific feasibility, manufacturing impact and quotation, but the released files and agreed acceptance plan remain the basis of approval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ_About_PCB_Supplier_Change_Notifications\"><\/span>FAQ About PCB Supplier Change Notifications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>What does PCN mean in PCB manufacturing?<\/h3>\n<p>PCN commonly means product or process change notification: a supplier\u2019s controlled notice of a proposed change affecting an approved PCB or PCBA.<\/p>\n<h3>Which PCB changes require a PCN?<\/h3>\n<p>Define triggers contractually; typical areas include material, process, site, equipment route, subcontractor, source, product configuration, test and supply status.<\/p>\n<h3>Is a PCN the same as an ECO?<\/h3>\n<p>No. A PCN usually originates with a supplier; an ECO authorizes a controlled engineering design change.<\/p>\n<h3>How much advance notice is required?<\/h3>\n<p>Use the purchase\/quality agreement and applicable customer or regulatory requirement. Do not assume one universal period.<\/p>\n<h3>Can a supplier implement a change before approval?<\/h3>\n<p>Only if the governing agreement allows it or a documented emergency\/deviation approval authorizes it.<\/p>\n<h3>What should be checked in the first changed lot?<\/h3>\n<p>Confirm identification, approved effectivity, targeted qualification evidence, traceability and any enhanced inspection or test.<\/p>\n<h3>What if a supplier changed a process without notice?<\/h3>\n<p>Contain affected lots, identify the implementation boundary, assess risk, request records and decide disposition plus corrective action.<\/p>\n<div class=\"ebest-inline-cta\" role=\"complementary\" aria-label=\"Controlled PCB change quotation\">\n<div class=\"ebest-inline-cta__inner\">\n<p class=\"ebest-inline-cta__title\">Turn a supplier change into a controlled first lot\u2014not a surprise.<\/p>\n<p class=\"ebest-inline-cta__text\">Email the PCN inputs and released data to sales@bestpcbs.com. EBest Circuit can return clarification points, a project-specific review path and PCB or PCBA quotation.<\/p>\n<div class=\"ebest-inline-cta__actions\" style=\"display:flex;flex-wrap:wrap;gap:12px;\"><a class=\"ebest-inline-cta__button ebest-inline-cta__button--primary\" style=\"flex:1 1 240px;\" href=\"mailto:sales@bestpcbs.com?subject=PCB%20Change%20Notification%20Package\">Send the Change Package<\/a><a class=\"ebest-inline-cta__button\" style=\"flex:1 1 240px;\" href=\"mailto:sales@bestpcbs.com?subject=PCB%20PCBA%20Change%20Quote\">Request a PCB or PCBA Quote<\/a><\/div>\n<p class=\"ebest-inline-cta__note\">Files | Change | Risk | Evidence | Lot | Delivery<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Use this PCB supplier change notification checklist to define PCN triggers, required fields, impact review, approval, effectivity and validation 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