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One - stop Printed circuit board assembly Solution provider Keep Best PCB Assembly Co., Ltd serves many well-known brand customers in industrial control, security, medical, Internet of Things, automotive, artificial intelligence, smart home, power and communications industries at home and abroad. The company continues to be customer-centric, improves the level of digital intelligence, and is committed to meeting continued high-quality customer needs.
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PCB Stackup Specification Checklist
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PCB Stackup Specification Checklist
Prepare a PCB stackup specification with layer construction, materials and impedance requirements. Agree fabrication review and revision approval.
A PCB stackup specification should describe the intended construction and the electrical and mechanical conditions the fabricator must review. Record the released layer arrangement, material requirements, copper construction and any controlled-impedance targets before comparing PCB quotations.
Ask the proposed fabricator to review the construction against the actual design and its accepted process conditions. The design authority should approve changes to materials, layer spacing or construction. A generic layer-count example or an unverified software result is not a substitute for an agreed stackup and acceptance plan.
PCB stackup specification and approval checklist
Send a controlled stackup document with the fabrication files and identify which values are fixed design requirements and which may be proposed for approval.
| Specification | Input to provide | Approval and evidence |
|---|---|---|
| Layer construction | Layer order, signal and reference-plane functions, copper requirements. | Review the proposed construction and record the approved revision. |
| Materials and thickness | Specified material requirements, finished thickness and accepted tolerances. | Approve any alternative material or construction before fabrication. |
| Controlled impedance | Relevant nets, target values, tolerance and applicable design geometry. | Agree the calculation assumptions and any verification or coupon requirements. |
| Mechanical and assembly conditions | Board outline, holes, warpage acceptance and assembly constraints. | Confirm that the proposed construction meets the customer-approved acceptance requirements. |
| Engineering changes | Updated files, change description and responsible design authority. | Compare revisions and approve the impact on fabrication, assembly and testing. |
Handover and acceptance
The released stackup, fabrication data, accepted deviations and agreed verification requirements form the handover record. Do not assume a fixed EMI reduction, yield or simulation coverage.
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