The BOM is the single source of truth for your assembly. A poorly structured or incomplete BOM is the most common cause of quoting errors, procurement delays, and build failures.
Required Fields (Non-Negotiable)
- Reference Designator(s) — e.g., C1, C2, C5; or C1-C3 for a range
- Manufacturer Part Number (MPN) — exact, full, no truncation
- Manufacturer Name — spelled out fully (not abbreviations)
- Component Description — e.g., ‘100nF 0402 X7R 10V 10% Cap’
- Quantity per assembly
- Package / Footprint — e.g., 0402, SOT-23, QFN-24
Strongly Recommended Fields
- Approved Alternate MPN(s) — 1–2 qualified alternates reduces supply risk
- Internal Customer Part Number — links to your design database
- Do Not Populate (DNP) flag — explicit field, not hidden in notes
- RoHS Compliance status per line item
- Unit of Measure (each, feet, etc.)
- Notes — any special handling, approved vendor restrictions, programmed device info
CRITICAL: If a component must be purchased from a specific vendor only (e.g., authorized distributor only, no gray market), state that explicitly in the Notes field. Amtech will comply but cannot assume restrictions not stated in writing.