Full Turnkey PCB Assembly: BOM Sourcing & Quote Scope
Table of Content
Full turnkey PCB assembly coordinates bare-board fabrication, component purchasing and assembly under an agreed project scope. A useful quotation should explain which BOM revision will be purchased, how substitutions are approved, what tests are included and how material availability affects the schedule.
What does full turnkey PCB assembly include? It normally describes a supply scope in which the assembly partner coordinates PCB fabrication, purchasing the agreed components and assembling the boards. Programming, functional tests, fixtures, shipping and other work must be specified in the quotation. “Full turnkey” alone does not define every deliverable or approval responsibility.
This guide focuses on BOM sourcing and quote review. Explore OrinewPCB’s turnkey PCB assembly service or one-stop assembly service for the available project options.
1. Define the material responsibilities
Separate full turnkey, partial turnkey and supplied-material assembly by the actual purchasing responsibilities. Use the quotation to record who provides each board and component item.
| Supply option | PCB and component scope | Buyer decisions to confirm |
|---|---|---|
| Full turnkey PCBA | Assembly partner coordinates agreed PCB fabrication, BOM purchasing and assembly | Approved files, part numbers, substitutions, quantity and acceptance requirements |
| Partial turnkey PCBA | Buyer supplies selected items; assembly partner sources the remaining agreed items | Exact sourcing split, supplied quantities, packaging, arrival dates and material gaps |
| Supplied-material assembly | Buyer supplies the agreed boards and components for assembly | Material readiness, labeling, shortages, handling requirements and test coverage |
Scroll the comparison within the table on a small screen. Confirm responsibilities for each line item before production release.
PCB fabrication, component purchasing and assembly can share a project contact without having identical commercial assumptions. Ask which activities the proposed quote includes and which decisions still need your approval.
2. Make the BOM ready for purchasing
A purchasing-ready BOM identifies what should be fitted and what may be substituted. Keep it on the same approved revision as the board files, placement data and assembly drawing.
- Manufacturer and complete part number: include the full ordering code rather than only a generic description.
- Reference designators and quantity per board: list the fitted locations and resolve mismatches.
- DNP / optional positions: identify the intended assembly variant and locations not to populate.
- Approved alternatives: provide approved part numbers or the process for requesting your approval.
- Special requirements: flag connectors, programmed parts, critical ratings, packaging or handling needs.
- Buyer-supplied items: identify ownership, available quantity and expected arrival where the scope is partial turnkey.
Example: 50 assemblies with two fitted connectors per board require 100 fitted connectors. Any sourcing minimum, allowance for the assembly process or unused quantity should be explained separately. This arithmetic illustrates the distinction between fitted demand and purchased quantity; it is not a supplier purchase commitment.
3. Agree on substitutions and purchasing approval
If a specified component has uncertain availability, ask for the proposed alternative and the reason for the change. Review its complete part number and relevant design requirements before approving it. A matching footprint or nominal value alone may not establish suitability.
- Record who may approve a replacement and how that approval is documented.
- State whether quoted component prices or availability have a validity period.
- Ask the supplier to identify proposed purchasing sources and available traceability records where your project requires them.
- Clarify how supplier minimums, unused materials and repeat-order inventory will be handled.
- Identify what happens if an unapproved substitution or material shortage is found before the build.
Keep substitutions connected to the BOM revision. For a repeat order, reconfirm changes in part numbers, approved suppliers, availability and assembly variants before releasing another purchase.
4. Compare the complete quotation scope
Compare quotes against the same approved files and quantity. A lower total may reflect excluded work, a different sourcing assumption or different delivery terms. Ask each supplier to identify the included items and open assumptions.
| Quote category | Check before comparing |
|---|---|
| PCB fabrication | Same revision, quantity, stack-up, material, copper, finish and fabrication requirements |
| Purchased components | Same BOM, approved alternatives, sourcing responsibilities and purchasing quantities |
| Setup and assembly | Stencil or tooling, setup, assembly sides, special operations and first-article requirements |
| Inspection and testing | Included checks, coverage, firmware, programming, functional procedure and required evidence |
| Fixtures and preparation | Included engineering or fixture work, ownership and repeat-build use |
| Delivery and schedule | Material readiness, production schedule, packing, shipping and quoted delivery terms |
| Validity and exclusions | Quote expiry, open decisions and items that may change price or timing |
For the individual cost categories, read our PCB assembly cost breakdown. Ask for prototype and production quantities separately when both are relevant to your purchasing decision.
5. Define the tests and release conditions
Assembly inspection does not by itself demonstrate that every product function works. If your quotation needs functional verification, provide a test procedure, pass/fail criteria, firmware version and fixture requirements.
- Inspection scope: agree on the relevant assembly checks and the evidence you need.
- Programming: provide the programming procedure and identify the supplied firmware.
- Functional testing: define the connections, operating conditions and measurements.
- Release approval: state any first-article or sample approval required before the full batch.
- Change control: identify how board, BOM, firmware or test changes affect the released build.
Request a schedule tied to file approval, component readiness and test preparation. Tell the supplier your target date and destination, and confirm the proposed build and delivery dates before relying on them.
For the next build stage, see our prototype assembly options, low volume assembly service and production release checklist.
Full turnkey PCB assembly purchasing questions
Is full turnkey assembly the same as one-stop PCBA?
The terms often describe coordinated fabrication, component sourcing and assembly. Confirm the exact scope in the quotation, including programming, testing, fixtures and delivery responsibilities.
Can I require approval before component substitutions?
State that requirement in the inquiry and ask for it to be reflected in the quote and build approval process. Provide approved alternatives where available.
Why can purchasing quantity exceed the number of fitted parts?
Supplier minimums, packaging quantities or agreed process allowances can affect purchasing. Ask the quotation to explain the difference and how remaining materials are handled.
Does full turnkey automatically include functional testing?
Functional testing should be specified. Share your procedure, firmware, pass/fail criteria and fixture needs so the team can confirm the included work.
What should I send to compare turnkey quotes?
Use the same Gerber package, PCB specification, BOM, placement file, assembly drawing, quantity, sourcing rules, test requirements and delivery destination for each inquiry.
Request a full turnkey PCBA quotation
Send OrinewPCB your Gerber files, BOM, pick-and-place data and build quantity. State the approved alternatives, target date and tests you require. If the files are unfinished, describe your application and identify the open decisions.
You can also send the project package to [email protected].
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