Turnkey, Consigned and Hybrid PCBA: Who Should Supply the Materials?

Turnkey PCBA usually means the assembly supplier buys the agreed materials and performs the agreed build. In a consigned build, the customer supplies specified materials for assembly. A hybrid build divides purchasing between customer and supplier. These labels are a starting point: the purchase order and material responsibility list must define the actual boundary.

Choose the model according to sourcing control, available purchasing resources, material availability and inventory exposure. Outsourcing purchasing can simplify coordination, but the customer still needs to control design requirements and approve changes. Supplying your own components can preserve an existing sourcing arrangement, but it adds kit preparation and shortage management.

Compare the three models by responsibility

Decision	Turnkey	Consigned	Hybrid
Purchasing	Supplier purchases the items listed in its scope	Customer supplies the items listed in the kit	Purchasing owner is defined for each BOM line
Bare boards	Included only if the scope says so	May be customer-supplied or separately sourced	Assign a specific owner
Design and BOM release	Customer or designated design authority approves the release	Same	Same
Alternatives	Supplier proposes; designated authority approves under the agreed rules	Customer controls the kit and approved replacements	Use one approval process across both purchasing owners
Shortages	Agree reporting, purchasing options and delivery effects	Agree kit reconciliation and replenishment responsibilities	Maintain one combined shortage list
Excess inventory	Agree purchase commitments and disposition	Agree counting, storage and return conditions	Track by item, ownership and purchasing source
Traceability	Agree the records provided by the supplier and its sources	Agree which source records arrive with the kit	Combine both record streams without losing ownership information

The matrix describes decisions to resolve, not KeepBest's contractual terms. A supplier might use the same label differently, particularly for bare-board supply, mechanical parts, firmware or finished product assembly.

When turnkey is worth discussing

Turnkey can suit a buyer who wants one party to coordinate material purchases and assembly, provided the supplier can support the required sources, records and commercial conditions. It can also make shortage tracking easier when procurement is managed through one agreed BOM.

Before choosing it, ask for the approved sourcing channels, the process for unavailable parts and the inventory commitments associated with your order. Component availability changes independently of assembly capacity. A complete quotation therefore needs to explain which materials are confirmed and which remain subject to purchasing or customer approval.

Do not equate supplier purchasing with permission to redesign the BOM. Record whether the assembler can choose among a pre-approved list or must obtain approval for every change. Clarify whether packaging variants, manufacturer changes or lifecycle changes trigger review.

When consignment may be appropriate

Consignment can suit a customer with existing component contracts, allocated stock or a need to retain control of selected parts. It works best when the customer can deliver a usable kit with reliable identification and supporting records.

A count of “enough parts for the order” may not be enough for assembly. Agree any justified handling or process allowance, how it is calculated and how unused material will be reconciled. Identify cut tape, reels, trays and other packaging details before shipment. Also agree what happens if a package is damaged, identification is incomplete or the supplied quantity differs from the packing list.

The supplier should acknowledge the received kit against a controlled list. An unresolved shortage should produce a decision about replenishment, a partial build or a schedule change. It should not produce an unapproved substitution merely to keep the line moving.

Use hybrid supply with a single material ledger

A hybrid arrangement can keep a critical device under customer control while delegating standard purchasing. The main risk is a gap between the two responsibility lists: both parties may assume the other is supplying the same item.

Create a ledger with the reference designators, complete orderable part number, quantity per assembly, build quantity, purchasing owner, required arrival date, received quantity and approval status. Include bare boards and mechanical items if they affect build readiness. Use this combined ledger as the meeting point for purchasing, stores and production planning.

Avoid separate supplier and customer spreadsheets with conflicting part numbers. When the BOM changes, update the controlled release and identify which existing inventory remains usable. This matters even when the PCB revision does not change.

Keep source quality separate from purchasing convenience

Ask where parts will be purchased and what records are available. TI's public anti-counterfeit guidance recommends buying TI products directly or through its authorized network. That is a manufacturer-specific policy and does not verify an assembler's sourcing channels. For each component manufacturer, check its applicable guidance and the proposed channel. TI: Anti-counterfeit guidance.

Document how lifecycle and product changes will reach the design authority. TI describes product change notices as communicating affected products, changes and supporting information. Such a notice is an input to review, not approval to substitute a different device. TI: Product change notification.

Agree inventory terms before purchasing

Discuss who authorizes minimum purchase quantities, which material is dedicated to the project, how excess stock is recorded and what happens after a design change or cancellation. Where a vendor imposes non-cancellable or non-returnable conditions, identify the affected items before making a commitment. The allocation of those costs belongs in the agreed commercial terms.

Storage and return decisions also need an owner. Ask how material condition, shelf-life requirements where applicable, customer property and records will be maintained. Do not assume a supplier offers indefinite free storage or that all unused parts can be returned to the original seller.

Make the decision at BOM-line level

Begin with the model that fits most of the project, then list exceptions. For every exception, assign purchasing, receipt inspection, shortage resolution, substitution approval and excess-stock disposition. If these responsibilities remain unclear, the material model is not ready for release.

This approach does not establish a universal cheapest model. Compare the total quoted scope, purchasing workload, inventory exposure and schedule assumptions for your actual BOM. The best arrangement may change between a prototype order and repeat production.

Discuss the material boundary for your project

Review the component purchasing scope alongside the assembly scope. Contact KeepBest with the materials you can supply, the items you want sourced and the quantity you are considering. The supported supply model, source requirements and commercial conditions need confirmation for that project.