Amtech groups BOM components into supply-risk tiers, from low-risk standard passives with multiple sources to high-risk single-sourced or long-lead parts, so sourcing effort focuses where a shortage would actually stop your build.
| Risk Level | Characteristics / Examples |
|---|---|
| Low Risk | Standard passives (resistors, caps, inductors) in common values. Multiple sources, short lead times (<12 weeks). |
| Medium Risk | Common active components (op-amps, LDOs, common MCUs). Lead times can spike 20–52 weeks in shortage cycles. |
| High Risk | Single-source components, custom ASICs, specialty sensors, power devices. Require strategic inventory. |
| Critical Risk | Long lead time (>52 weeks), no alternates, direct impact on product ship capability. |