Consigned PCB Assembly strips the supply chain down to a pure manufacturing transaction—you bring the parts, the CM runs the lines. The assembler owns process, equipment, labor, and QC; you own the bill of materials and every component that goes on the board. This flips the typical turnkey model, where the contract manufacturer procures everything and invoices it as part of the build.
Two models dominate the floor. Full consignment means you supply every piece: bare boards, passives, ICs, connectors, even solder paste and stencils if specified. It’s standard for OEMs with locked supply chains or legacy products where component sourcing is tightly controlled. Partial consignment splits the load—you provide long-lead or strategic parts (e.g., FPGAs, RF modules), while the CM sources commoditized passives or standard mechanicals. High‑mix, low‑volume shops often run this way to balance procurement agility with supply security.
The upside is concrete. You control critical component quality, especially for regulated or EOL parts. You reuse existing inventory instead of letting it sit in a warehouse. You avoid CM markup on scarce or allocated parts, which can be brutal in tight markets. And you stay compliant when components must meet specific traceability, RoHS, or country‑of‑origin rules—something turnkey agreements rarely detail tightly enough. For engineering teams, consignment keeps design intent intact through the build.
The trade‑offs are equally real. If a reel arrives short or a moisture‑sensitive part fails incoming inspection, the line stops—and the delay is yours. You carry the burden of material readiness: kit completeness, labeling accuracy, MSD handling. Partial mismatches between your specs and the CM's standard processes can trigger rework or NPI friction. And unless explicitly contracted, defect attribution often tilts toward the party supplying the suspect material.
Consignment fits best when IP protection, component control, or cost transparency outweigh convenience—defense electronics, medical devices, legacy industrial systems, or products riding volatile supply chains. Turnkey makes more sense for fast‑moving consumer hardware, early prototypes needing rapid iteration, or companies without dedicated supply‑chain staff. If your team can’t manage inbound logistics or traceability paperwork, consignment will likely cost more time than it saves.
Execution discipline matters. Lock your BOM with exact manufacturer part numbers—no "or equivalent" ambiguity. Require incoming inspection reports and IPC‑A‑610 acceptance criteria in writing. Track lot codes and date codes at the reel level; your CM should support component traceability without custom overhead. Audit ESD and moisture‑sensitivity handling before launch, not after a batch failure. Finally, stage buffer stock for critical parts; consignment gives you control, but zero slack if a feeder runs dry mid‑run.
If you can manage parts better than your assembler can source them, consignment wins—otherwise, pay for the convenience and take the markup.
Email: all@poe-pcba.com
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