Consigned PCB assembly: choose material supply by responsibility
Consigned PCB assembly and turnkey PCB assembly differ in more than who buys materials. Procurement authorization, shortages and losses, substitution approval, packaging condition, MOQ, and surplus materials affect costs and lead times. Orders define responsibilities; do not broadly state that the factory bears all material risks in turnkey PCB assembly.
Responsibility matrix for three material-supply models
| Item | Customer Supplied Material | Factory Procurement | Key components consigned; other components supplier-procured |
|---|---|---|---|
| Part Number and Version | The customer provides the approved BOM and actual materials | Customer approval of original part numbers and procurement scope | Share the same BOM and mark item ownership for each |
| Material Shortages and Replenishment | Agreed complete kit, replenishment, and notification | Agree on Procurement Quantities, Authorization, and Delivery | Coordinate joint kit availability and batch selection |
| Loss and Incoming Material Defects | Agree acceptance, normal losses, and exception handling | Agree procurement and inspection responsibilities without assuming unlimited liability | Categorized by specific materials and reasons |
| Alternative Material | No material substitution without customer approval | Define substitutable items, engineering verification, and approvers | List Permissions Separately for Critical and General Materials |
| MOQ and inventory levels | Return or custody of consigned excess materials | Excess-purchase authorization, surplus ownership, and costs | Inventory ownership for each item must remain clear |
| Lead Time Countdown | Milestone for data and consigned material kit readiness | Confirm procurement, material readiness, setup, and scheduling separately | Schedule around the latest critical input and agreed milestones |
Choose the supply model by control priority
Where established procurement and approved-material channels exist, consigned supply can help control sources, but packaging, opening, replenishment, and tracking still need management. Procurement can be commissioned to reduce multi-supplier coordination, while defining channel evidence, authorization, and inventory. Customer-supplied dedicated key parts with procured general parts is another option for review, not a fixed service capability without confirmation.
Decision example: one scarce chip blocks prototype completion
Three options are available: wait for original manufacturer parts, have the customer supply from approved channels, or obtain design-approved substitutes. Waiting delays material readiness; consigned supply adds tracking for both parties; substitution may require firmware, structural, and performance verification. Include MOQ, extra verification, logistics, and surplus materials in total-cost comparisons, not just part prices. This example is not company inventory or an actual order record.
Write procurement permissions as executable sentences before purchasing
For example, U1 permits only approved original manufacturer part numbers; substitutions require design confirmation and retesting is more executable than equivalent-performance substitutions permitted. Check available evidence for specified channels, date codes, or original packaging. Recommendations to use manufacturer-authorized channels do not establish supplier distributor status; review material PCNs and obsolescence against each manufacturer's notices.
Customers prepare quantities, BOM, material ownership, channels and substitution authority, material-readiness requirements, and surplus requirements; engineering/procurement returns responsibilities, gaps, procurement costs, verification duties, and delivery milestones. Define these responsibilities in the accepted project scope rather than inferring them from a supply-model label.
Resolve the open decisions before placing the order
Procurement Service: Verify channels, MOQ, and alternatives. ·
Request for Quotation Documents: align BOM, DNP, and revisions.
OEM Commission: define development and manufacturing responsibilities. · Procurement and Acceptance Knowledge
Engineering reference | Component procurement counterfeit prevention: authorized channels and batch traceability. A basis for methods and selection; not evidence of KFPCBA capabilities
Engineering reference | PCNs and discontinuance notices: substitute components and repeat-order revision control. A basis for methods and selection; not evidence of KFPCBA capabilities
Check the kit against the approved BOM and build quantity
The following management method was compiled by the author. Usable materials require correct identity, suitable condition, sufficient quantity, and clear authorization together. A chip arriving in full quantity but with an incorrect suffix or unapproved source cannot be marked ready for line use; critical inputs such as solder paste, PCBs, firmware, and tooling also require separate confirmation. Customer-supplied and factory-procured materials use the same BOM revision, avoiding divergent lists maintained by each party.
| Status | Judgment Basis | Next Action |
|---|---|---|
| Available Complete Kit | Part number, source, condition, and quantity all approved | Production Scheduling by Confirmed Routing |
| Quantity Shortage | Difference between net requirements and available received quantity | Replenishment, batched, or adjusted plan |
| Pending Technical Approval | Replacement suffix or part number not confirmed | Design evaluation and necessary verification |
| Pending Source or Status Verification | Unclear channel, batch, packaging, or moisture sensitivity | Quarantine the material, request supporting records, and keep it separate from released stock |
How to recalculate material balance for receipts and shipments
Engineering calculation example: 100 boards use 2 components each; 210 units are received, 200 installed, and 2 confirmed as process scrap, leaving a ledger balance of 210－200－2＝8. If 5 are returned to the customer and 3 stored by agreement, list these separately in receipt/issue records. Do not classify all remaining 8 as losses without explanation; investigate causes and responsibilities for physical shortages.
| Quantity Field | Recording Requirement |
|---|---|
| Received Quantity | Complete part numbers, lots, packaging, and receiving condition |
| Issuance and Loading | Work orders, product quantities, actual consumption, and returns from the line |
| Testing and Scrapping | Cause, quantity, approval status, and returnability |
| Remaining Material | Return, storage, validity status, and ownership |
Do not combine surplus from different sources or package-opening histories into reels based only on quantity. Agreements define inventory ownership, storage charges, retention periods, and expiry handling; no single loss rate suits all materials. Recheck surplus usability before repeat orders rather than treating system inventory as ready-to-use stock.
What procurement approval and substitution approval each establish
TI's anti-counterfeit page supports prioritizing manufacturer and authorized sources, while its PCN page provides change and discontinuance notices. Channel approval answers where to buy; technical approval answers whether the item suits the current product. Customer approval of an emergency channel does not automatically approve different part numbers, mixed lots, or missing moisture-sensitivity history; engineering approval of a substitute does not permit procurement from any source.
Executable mixed-supply instructions should include reference designators, specified part numbers, supplier responsibility, permitted channels, substitution authority, confirmer, and effective scope. For customer-supplied key processors and procured general resistors/capacitors, still specify dimensions, tolerance, power ratings, and substitution boundaries; do not simply let the factory choose standard parts. For new components or PCNs, list testing and first-article responsibilities together.
Decide how to handle shortages and material exceptions
Method scenario: a connector is the only missing item for a board build. Compare waiting, customer replenishment, or approved substitution, but account for substitute impacts on harness mating, height, holes, and mechanics. Completing SMT first may be feasible, or may add work-in-process storage and later line-return costs; the route determines this. Compare extra transport, packaging, package opening, renewed setup, and retesting together, not only connector unit price.
When incoming defects occur, preserve materials, packaging, lots, and unused samples first; link affected products if materials have reached the line. Determine procurement, incoming-material, storage, or manufacturing responsibility from causes and contracts, rather than assigning everything to consigned or procured supply in advance. At delivery, provide material status, actual usage, losses and surplus, substitution approvals, and closed exception records so customers can trace each BOM item to its actual disposition.
Source material and applicable scope
- Texas Instruments, Anti-counterfeit; webpage does not specify a version; checked 2026-10-17; sections: authorized sources, counterfeit identification, and channel-support descriptions. Supports TI product channel management; does not guarantee authenticity of specific lots.
- Texas Instruments, Product change notification (PCN); webpage does not specify a version; checked 2026-10-17; sections: notification information, Semiconductor product withdrawal/discontinuance. Supports TI public processes and fields; project dates follow specific notices, without citing full standards.
Which is cheaper: consigned PCB assembly or turnkey PCB assembly?
With approved materials and inventory already available, consigned PCB assembly may avoid duplicate purchases; where multi-supplier coordination and small-package handling are needed, turnkey PCB assembly connects procurement with assembly. Compare actual received materials, MOQ, losses, surplus, and assembly/testing rather than only the factory procurement markup.
Compare costs and verification under the same conditions
Create consigned and procured lists under the same BOM, covering purchase prices, package quantities, transport, receipt checks, shortage replenishment, and remaining inventory. Customer-supplied key parts plus procured general parts is a third combination, requiring complete materials for the same revision.
View services and configurations related to this question or Request a project quotation. For initial discussions, describe the intended use, available documentation, and expected quantity.
Related procurement and acceptance Q&A
Which is cheaper: consigned PCB assembly or turnkey PCB assembly?
See: Which is cheaper: consigned PCB assembly or turnkey PCB assembly?
How should total costs be compared for waiting, consigned supply, and substitution of scarce chips?
Check material-readiness impacts, tracking by both parties, and firmware/structure/performance verification separately, including MOQ, logistics, and surplus. Cheaper substitute parts do not necessarily lower total project costs.
See: Decision example: one scarce chip blocks prototype completion
Who owns surplus when key parts are consigned and remaining parts are procured?
Agree excess-purchase authorization, normal losses, incoming defects, and return/storage rules item by item. Mixed supply must also share one BOM and define inventory ownership for every item.
See: Responsibility matrix for three negotiated supply models
Does allowing equivalent-performance substitutions authorize immediate replacement?
Define substitutable reference designators, original manufacturer part numbers, engineering verification, and approvers. Equivalent performance alone does not establish package, firmware, or test compatibility.
See: Write executable authorization instructions before procurement
Does turnkey PCB assembly include software development and all material risks?
Material-supply method does not define development scope or unlimited risk liability. Agree procurement authorization, inspection, exception handling, and development work separately, then price actual manufacturing and testing.
See: Consigned PCB assembly: choose material supply by responsibility
A shortage decision before the build is delayed
A mixed-supply order can stop even when most parts are in stock. For each critical BOM line, record the approved manufacturer part number, required quantity including agreed allowance, available quantity, owner of the stock and latest decision date. Treat a supplier's proposed equivalent as a request for review, not automatic purchasing authority.
| Situation | Decision needed | Record to keep |
|---|---|---|
| Customer-supplied part is short | Ship more, reduce the build, or approve a separately evaluated alternative | Shortage count, board impact and revised delivery basis |
| Supplier-procured part is unavailable | Wait, approve a source change, or authorize a design change | Proposed full part number, source, approver and validation result |
| Extra parts remain after assembly | Return, retain for reorder, or dispose under instruction | Lot, quantity, ownership and storage agreement |
Put the decision date before the assembly start, not in the final shipping discussion. The price comparison should include the cost and schedule effect of each approved route under the same accepted-unit quantity.
RFQ handoff: assign each material owner
Mark each critical BOM line as consigned, supplier-procured or pending, with approved sources and shortage decisions. Use the sourcing scope and send the current list through the project inquiry.
