Box Build vs. PCB Assembly: Scope & RFQ Checklist
Table of Content
- What is box build assembly?
- 1. Compare PCB assembly and box build scope
- 2. Release an electronic and a mechanical material list
- 3. Specify fit and access before the build
- 4. Define firmware and test acceptance separately
- 5. Compare the complete quotation
- Box build purchasing questions
- Request your PCBA build and define the next delivery stage
ORINEWPCB · ELECTRONICS PURCHASING GUIDE
What is box build assembly?
Box build assembly integrates a populated circuit board with an enclosure and the other parts needed for a defined electronic product or subassembly. Depending on the project, it can include mechanical installation, cables, interfaces, firmware configuration, agreed testing, labeling and packaging.
PCB assembly and box build are different delivery scopes. A full turnkey PCBA quote can cover PCB fabrication, component sourcing and board assembly; enclosure integration and product-level work must be requested and confirmed separately.
For a purchasing team, the useful question is: what exactly should arrive, and what evidence will show it meets the agreed requirements? Define that deliverable before comparing prices.
1. Compare PCB assembly and box build scope
| Requirement | PCBA scope | Additional product-level scope |
|---|---|---|
| Material package | Bare PCB and fitted electronic components. | Enclosure, fasteners, cables, interface parts and other mechanical items. |
| Assembly data | Gerber files, BOM, placement data and board assembly drawings. | Mechanical drawings, mounting details, cable drawings and integration instructions. |
| Configuration | Board firmware or programming if specified. | Product configuration, settings and version records if required. |
| Acceptance | Agreed board inspection and tests. | Agreed checks and tests for the integrated product or subassembly. |
| Delivery | Populated boards with agreed protection and documentation. | Defined assembled units, labels, accessories and packaging. |
Start with full or partial turnkey PCBA when your main need is board fabrication, BOM procurement and assembly. List any enclosure or integration work as an additional scope for review.
2. Release an electronic and a mechanical material list
The PCB BOM identifies what is fitted to the board. A product or mechanical BOM identifies the enclosure, mounting hardware, cables, labels and other items needed for the delivery scope. Keep the revisions aligned.
- Board package: fabrication files, exact part numbers, placement data, do-not-fit positions and variants.
- Mechanical package: part numbers, drawings, dimensions, mounting details and specified materials or finishes.
- Interfaces: connector identity, orientation, pin assignments and cable drawings where relevant.
- Responsibility: who supplies each PCB, component, enclosure and subassembly.
- Changes: who approves alternatives and which revision is released for purchasing.
If you supply selected items, include their quantity, packaging and arrival dates. Use the partial turnkey sourcing checklist to define the material handover.
3. Specify fit and access before the build
Provide the installed arrangement and mechanical constraints. The quote review needs more than a photograph of the outside of the enclosure.
Mounting and clearance
Show board mounting points, component height limits, connector access and the intended enclosure revision.
Cables and interfaces
Define connector orientation, cable routing, attachment and any strain relief or handling instructions.
Test and service access
Identify programming connectors, fixture access and any operations that must happen before the enclosure is closed.
Supply customer-approved instructions for fasteners, adhesives, thermal interfaces or other special operations. Confirm feasibility and required preparation in the quote rather than assuming every operation is included.
4. Define firmware and test acceptance separately
A populated board and an assembled enclosure do not by themselves demonstrate product function. State what must be checked, which firmware is used and what counts as a passing unit.
- Released firmware, programming method and configuration settings.
- Test procedure, connections, operating conditions and pass/fail limits.
- Fixture requirements, ownership and any preparation work.
- Board-level checks and additional checks for the integrated product.
- Serial number, traceability and records needed with delivery.
- Any sample or first-article approval before the full quantity.
Specify burn-in, environmental or other special testing only when required, and ask the provider to confirm availability, coverage and cost. Product compliance work should be defined separately; an assembly service label does not certify the finished equipment.
See the factory and quality workflow for questions to bring to the build review.
5. Compare the complete quotation
Use the same delivery scope, revisions and quantity for every quote. Separate one-time preparation from repeat-unit cost and identify unresolved assumptions.
| Category | What to confirm |
|---|---|
| Materials | PCB and component sourcing, mechanical materials, supplied items and approved alternatives. |
| Preparation | Stencil/tooling, setup, fixture preparation, work instructions and any sample approval. |
| Assembly | Board assembly, specified manual tasks and any agreed enclosure or cable integration. |
| Programming and tests | Firmware, configuration, procedures, coverage, acceptance criteria and reports. |
| Packaging and delivery | Labels, accessories, protective or retail packaging, destination and delivery terms. |
| Open items | Capability confirmation, missing files, shortages, exclusions and quote validity. |
Read the PCB assembly cost breakdown for the board portion. Include the first batch and any repeat quantities, and clarify whether the target date means production completion, dispatch or arrival.
Box build purchasing questions
Does full turnkey PCBA automatically include an enclosure?
No. Full turnkey PCBA generally coordinates fabrication, agreed component sourcing and board assembly. Enclosures, cables and product integration need their own requirements and quote confirmation.
Can I supply the housing or selected components?
You can propose customer-supplied materials. List the items, quantities, revisions, packaging and arrival dates so the material handover and remaining work can be reviewed.
What files are needed beyond the PCB package?
Provide the mechanical or product BOM, drawings, mounting and cable details, firmware, integration instructions, test procedure and delivery requirements.
Is a board functional test enough for the finished product?
It depends on the acceptance requirements. The assembled system may need additional interface, configuration or product-level checks. Define the coverage and procedure explicitly.
Does box build remove the need for product compliance review?
No. Identify applicable product requirements, responsibilities and documentation separately. Assembly and agreed production tests do not automatically provide finished-product certification.
How do I request PCBA plus additional assembly from OrinewPCB?
Start with the PCB files, BOM, quantity and target date. List enclosure, cable, programming, test and packaging needs separately. The team reviews the requested scope and confirms what can be included in the quotation.
Request your PCBA build and define the next delivery stage
Ask OrinewPCB for one-stop PCB fabrication, component sourcing and assembly. If you also need product integration, provide the mechanical package and list each additional operation for capability and scope review.
Inquiry example: “Full turnkey PCBA; [quantity and revision]; [firmware/tests]; target [date and destination]. Please also review [enclosure/cable/label/packaging requirements]. Mechanical drawings and product BOM are [available or pending].”
Review turnkey assembly services · Discuss the complete delivery scope
Files can follow by email at [email protected]. Final scope, price and schedule follow review of the project requirements.
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