Description
PCB Manufacturing and PCBA: Define One Build Package
A combined fabrication and assembly enquiry needs one consistent revision across the bare-board files, component list, placement data and test requirements. This page focuses on that handoff.
Keep the four source files aligned
Provide fabrication outputs, a BOM with manufacturer part numbers, component placement data and assembly drawings. State the board revision in each file or in a release note. Mark do-not-populate positions and variants so that a shared layout does not become an ambiguous assembly order.
Assign component responsibility
Identify turnkey sourcing, customer-supplied components and any mixed arrangement. For consigned parts, describe the packaging and available quantities. List approved alternatives explicitly; an apparently similar component can change footprint, firmware behavior, qualification or test coverage.
Define the testable assembly
State whether the order includes programming, functional testing, fixtures or only specified inspection stages. Provide firmware revision, connector information and the expected observable result where powered tests are requested. AOI, X-ray, electrical connectivity and functional tests address different failure modes.
Ask for an itemized scope
Separate board fabrication, components, assembly, tooling and testing where they form different work packages. State quantity, delivery destination and target date. The useful comparison is the delivered and tested assembly at an agreed revision, not an isolated assembly labor number. Do not treat a catalogue amount as a project quotation.
Close open engineering questions
Send preliminary files if layout or sourcing decisions remain open. Ask the proposal to identify assumptions and exclusions before approval. Record any accepted changes in the release package so procurement, fabrication and assembly use the same requirements.
Review the PCB assembly service. For the supplier evidence needed for your order, review quality assurance.
