BOM List for PCB Assembly: Fields That Identify the Build

Reference designators identify component positions. Quantity states how many are fitted per assembly. Manufacturer and full part number identify the approved device. Description and footprint help reviewers detect inconsistent or ambiguous entries.

A supplier stock code can help purchasing, but it is not a substitute for manufacturer identity. Keep distributor references separate so a supplier change does not silently change the engineering definition of the part.

State do-not-populate positions and variant-specific changes in a controlled way, including options being evaluated during prototype PCB assembly. Do not leave a missing BOM row as the only indication that a position should remain empty.

Check that the quantity agrees with the listed fitted designators for the chosen variant. Distinguish one-board usage from procurement quantity so a production multiplier is not accidentally applied twice.

For turnkey PCB assembly, include supply ownership, approved alternatives and notes for critical or programmed devices where needed. Keep proposals separate from approved substitutions and retain revision history for changes. For repeat builds under an electronic contract manufacturing agreement, define who approves substitutions and releases each BOM revision.

Before requesting PCB assembly, compare the BOM with placement data and assembly drawings. The readiness tool records known gaps but does not inspect your spreadsheet or certify a match. Retain the approved records in the PCB build package, including the exact image and programming instructions for any programmed parts.