Sourcing Aerospace PCB Assembly, Build to Print
To buy a board assembly you can fly or put on a test stand, name the soldering and acceptance standards with class and any space addendum, decide who buys the parts and from which sources, and require moisture control, X-ray where joints are hidden, recorded test data and a first article report. Aerospace Sourcing matches PCBA jobs to qualified assembly shops and checks the records before shipment.
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What PCB assembly sourcing covers
It covers populating a bare printed board with components and turning it into a tested assembly, built to your drawing, bill of materials and assembly data. The same build-to-print process serves three very different end uses, and the end use decides almost every requirement below.
- Flight hardware. Avionics, spacecraft and payload electronics, launch vehicle boxes. Highest workmanship class, space addendum where the contract imposes it, strict parts sourcing and full traceability.
- Ground support equipment. Control, power and data boards in GSE racks and consoles that connect to flight hardware. Usually Class 3 workmanship without a space addendum, with the interfaces to flight hardware treated with care.
- Test and lab equipment. Interface boards, breakout boards, load boards and fixtures used in checkout and qualification testing. Often Class 2, built fast, but the test result is only as good as the board.
The bare board is a separate purchase with its own standards, covered on our printed circuit boards page. Cables that terminate on the assembly are covered on our wire harness hub. This page covers the assembly step and the parts that go onto the board.
Workmanship standards: J-STD-001 and IPC-A-610
Put both documents on the order, with revision and class: J-STD-001 for how the assembly is soldered and controlled, and IPC-A-610 for how the finished assembly is inspected and accepted. They are written to work together, and a callout of only one leaves part of the job undefined.
| Document | What it governs | What to write on the PO |
|---|---|---|
| J-STD-001, Requirements for Soldered Electrical and Electronic Assemblies | Materials, process requirements and acceptance for soldered connections | Revision (J is current) and class |
| J-STD-001JS, space and military applications addendum | Supplements or replaces specific J-STD-001 requirements for assemblies that must survive launch vibration and thermal cycling; released January 2025 and not used on its own | Addendum revision, paired with the matching base revision |
| IPC-A-610, Acceptability of Electronic Assemblies | Visual acceptance criteria for the finished assembly, including handling and mechanical items outside the soldering standard | Revision (J, published March 2024) and class |
| NASA-STD-8739.6 | NASA's implementation requirements for the workmanship standards it adopts, including training and ESD control | Revision your mission assurance requirements cite |
Revision pairing matters. IPC-A-610J was developed alongside J-STD-001, and IPC has since issued an automotive addendum to both, so a buyer who copies an old callout can end up citing a base document and an addendum from different generations. Confirm the current revision on the IPC store and cite what your contract requires.
For NASA work, NASA-STD-8739.6B took effect in February 2021. NASA's Office of Safety and Mission Assurance notes that adopting a new industry revision is not automatic, because each release has to be evaluated, so a NASA program may cite an earlier revision than the newest IPC release. Our printed circuit boards page explains why Class 3 alone is not a substitute for the space addendum on NASA hardware.
Have a part like this?Send it in under a minute. A person replies within 1 business day.Choosing the class by end use
Assign the class yourself, because the customer owns that decision and the assembler will otherwise quote the class it builds most. IPC's three classes run from general products (Class 1) through dedicated service products (Class 2) to high performance products that must work on demand in harsh environments (Class 3).
| End use | Typical starting point | Adders to consider |
|---|---|---|
| Spacecraft, payload or launch vehicle electronics | Class 3 plus the space addendum, or the NASA workmanship set if imposed | Polymeric controls for staking and coating, outgassing data, ESS |
| Defense avionics and weapon system electronics | Class 3, with the space and military addendum where the prime requires it | DFARS counterfeit flowdowns, lead-free control plan, ESS |
| GSE control and power boards | Class 3 for anything that commands or powers flight hardware | Conformal coating for humid or salt air sites, functional test against the interface |
| Lab and test equipment boards | Class 2 is often enough | Class 3 for boards in the signal path of acceptance tests |
Mixing classes on one program is normal. Write the class per assembly number, not per program, so a quick-turn lab board does not get priced at flight rigor and a flight board does not slip to Class 2.
Turnkey, consigned or partial consignment
Decide who buys the parts before you request quotes, because it changes who carries the counterfeit risk, who owns shortages and how the quote is built.
| Model | Who buys components | When it fits | What to watch |
|---|---|---|---|
| Turnkey | The assembler buys everything on the BOM | Most builds where parts are in production and you want one party accountable | Approved sources, alternates policy, traceability and excess part ownership must be in writing |
| Consigned | You supply all parts, often from your own stores or a program buy | Flight parts bought and screened under your program, NASA or prime parts lists, long lead parts already in hand | Kit accuracy, MSL status of what you ship, attrition for small passives, and who pays when a kit is short |
| Partial consignment | You supply critical or long lead parts; the assembler buys commodity parts | Screened active parts from your program with standard passives and hardware from the assembler | A clear BOM split by line, and one traceability record that covers both sources |
Consigned kits are where builds stall most often. Send attrition for chip passives, ship moisture sensitive parts in dry packs with their humidity indicator cards, and label every bag with the BOM line and reference designators. Our kitting and BOM sourcing pages cover how to build complete kits when you prefer to consign.
Parts procurement and counterfeit controls
On defense work, flow down DFARS 252.246-7008 and buy electronic parts from the original manufacturer or its authorized suppliers first. The clause, dated January 2023, sets three tiers of sources and requires extra steps whenever parts come from outside the first tier.
- Preferred. Parts in production or in stock from the original manufacturer, its authorized suppliers, or suppliers that obtain parts only from those sources.
- Contractor-approved suppliers. Used only when no preferred source has the part. The contractor approves them using established counterfeit prevention standards and takes responsibility for authenticity.
- Other sources. Used only when the first two are unavailable. The contractor must inspect, test and authenticate the parts, keep the documentation, and promptly notify the contracting officer in writing.
The clause also requires risk-based traceability from the original manufacturer to government acceptance when the contractor is not the manufacturer or an authorized supplier, and it flows down to subcontracts for electronic parts or assemblies that contain them, including commercial products. A board assembly is squarely inside that scope.
Three SAE standards sit behind those words. AS5553 sets requirements for avoiding, detecting, mitigating and disposing of counterfeit EEE parts and is meant to be flowed to anyone who buys them. AS6081A, issued in April 2023, sets requirements for independent distributors. AS6171, issued in October 2016 and revised as AS6171A in April 2018, standardizes inspection and test procedures for suspect counterfeit parts when the chain of custody is unknown or parts come through brokers and independent distributors, with specific methods in separate slash sheets such as X-ray fluorescence, delid and decapsulation, and electrical test. SAE is plain that no amount of testing can confirm an item as authentic, which is why the source tiers come first.
When a BOM line is obsolete, decide in writing who may buy it and what testing applies before the assembler goes to the open market. Our counterfeit parts avoidance and obsolete parts pages go deeper, and EEE parts grades covers commercial, military and space grade parts.
Moisture sensitive devices
Require the assembler to control moisture sensitive devices to IPC/JEDEC J-STD-033 and to record floor life for every opened package. Plastic packages absorb moisture once their dry pack is opened, and reflow can turn that moisture into internal cracks or delamination that a visual inspection never sees.
The component maker assigns each part a moisture sensitivity level (MSL) under J-STD-020, and J-STD-033 sets the handling rules. Texas Instruments application report SLVA840 reproduces the floor life table from J-STD-033C at 30 °C:
| MSL | Floor life out of dry pack |
|---|---|
| 1 | Unlimited |
| 2 | 1 year |
| 2a | 4 weeks |
| 3 | 168 hours |
| 4 | 72 hours |
| 5 | 48 hours |
| 5a | 24 hours |
| 6 | Bake before use, then reflow within the time on the label |
TI notes that higher humidity or temperature shortens floor life and that J-STD-033 gives an equivalent floor life table for other conditions. Confirm the current revision of J-STD-033 on the IPC or JEDEC store before writing it into a contract.
Ask how the shop tracks exposure across shifts and partial reels, how it bakes parts that exceed floor life, and how it records it. On consigned builds, the MSL clock starts when you open the bag, so ship sealed packs and say so on the packing list.
AOI, X-ray and visual inspection
Require automated optical inspection on every assembly and X-ray on every joint you cannot see, then name the acceptance standard for both. Inspection without stated criteria produces images, not decisions.
- Automated optical inspection (AOI). Checks presence, polarity, placement and visible solder fillets after reflow. It is fast and catches the common errors, but it cannot see under a part.
- X-ray. Needed for ball grid arrays, land grid arrays and bottom terminated parts such as QFNs, where the joints are hidden. IPC-7095, now at revision E, is IPC's guidance on BGA design and assembly and includes inspection and voiding. Published voiding limits vary by revision and by how the void is measured, so agree on the class, the reference area and whether 2D X-ray or 3D computed tomography is required, and ask for the images of first articles.
- Visual inspection to IPC-A-610. Trained inspectors still judge workmanship items that machines miss, such as damaged parts, contamination, wire dress and hardware.
Cleanliness and coating come next. If the assembly will be coated, the board has to be clean and dry first, and the coating material and workmanship are called out separately; our conformal coating page covers types, thickness and masking.
Functional test and environmental stress screening
State how each assembly will be proven to work, who supplies the test procedure and fixture, and what data comes back. Workmanship inspection shows the board was built correctly; test shows it works.
- In-circuit or flying probe test. Checks component values, shorts and opens on the bare assembly. Flying probe needs no dedicated fixture and suits low volumes; bed of nails fixtures pay off at higher volumes.
- Boundary scan. Uses the test access port defined in IEEE 1149.1 to test connections to devices that support it, which helps on dense boards where probes cannot reach.
- Functional test. Powers the assembly and checks it against your test procedure. Usually you supply the procedure and often the test fixture or station; say so on the RFQ, and say who owns the fixture. Our tooling and fixtures page covers ownership and marking of fixtures you pay for.
- Environmental stress screening (ESS). Thermal cycling and random vibration applied to every unit to precipitate latent workmanship and part defects before delivery. MIL-HDBK-344A, Environmental Stress Screening of Electronic Equipment (1993), is still listed as valid for use after its 2007 and 2012 notices, though many programs now specify ESS profiles in their own documents. Give the profile, the number of cycles and the failure-free period, or reference the document that contains them.
Qualification testing such as thermal vacuum or shock on a design is a separate lab job; our test lab time hub covers it.
Documentation and first article
Ask for an AS9102 first article inspection report on the first assembly from a new source or after any change in revision, process, location or BOM source, plus a build record for every serial number.
- Build traveler with every operation, operator and inspector stamp, and any rework or repair recorded with its disposition
- Parts traceability by BOM line: manufacturer, part number, lot or date code and source, tied to the assembly serial number
- MSL and bake records for moisture sensitive parts
- Inspection records: AOI results, X-ray images for hidden joint parts on first articles, and visual inspection sign-off
- Test data by serial number, including ESS logs where required
- Certificate of conformance citing the standards, revisions and classes on the PO
Our first article inspection guide explains the AS9102 forms, and our certificate of conformance page covers what a C of C should state.
What to put on the PCBA RFQ
These lines decide which assemblers can quote and whether the quotes compare:
- Assembly drawing and revision, BOM with approved manufacturers and alternates policy, centroid and Gerber or ODB++ data, and the bare board source
- Quantity per lot, program quantity and serialization
- End use: flight, GSE or test equipment
- J-STD-001 and IPC-A-610 revisions and class, any space addendum, and NASA workmanship documents if imposed
- Turnkey, consigned or partial consignment, with the BOM split by line
- Parts sourcing rules: DFARS 252.246-7008 and 252.246-7007 flowdowns, AS5553 or your counterfeit plan, and who approves non-authorized sources
- Lead-free and tin whisker requirements, if your program restricts pure tin finishes
- MSL handling to J-STD-033 and the records you want
- AOI, X-ray and acceptance criteria, cleanliness and conformal coating callouts
- Test: in-circuit or flying probe, boundary scan, functional test procedure and fixture ownership, ESS profile
- First article, source inspection and the data package at delivery
- ESD packaging and labeling, need date and export control status of the data
Assembly data for defense and launch electronics is often controlled. See confidentiality for how files are handled and the controlled programs process, which keeps controlled data with US persons. Our RFQ builder structures these lines into one request.
How Aerospace Sourcing handles a PCBA job
We match the assembly to a shop that builds to the class, addendum and test requirements you need, flow down the parts sourcing, moisture control, inspection and documentation requirements, and review the records before shipment. We do not run an assembly line ourselves, and we do not promise that a shop is available for every build or date.
- One quote, one lead time, one point of contact and one purchase order, even when the bare board, components, assembly, coating and test come from different sources
- Parts sourced through authorized and franchised channels or the manufacturer, with obsolete lines handled under counterfeit avoidance controls
- A certificate of conformance with every order, plus test data, FAI and other certificates your request requires
A person replies within one business day, and rush requests are prioritized. Every supplier signs a flow-down NDA before seeing files, and suppliers do not learn the end customer unless you approve. Our satellite manufacturers and defense contractors pages cover how we support those programs.
Request a PCB assembly quote
Send the assembly drawing, BOM and data through the PCB assembly request form. It is preset for PCBA, so it asks for the class, any space addendum, whether parts are turnkey or consigned and what testing you need, which are the answers that decide which shops can quote and whether their prices compare. A person will reply within one business day.
Send the job. A person replies within 1 business day.
Part, quantity and date are enough to start. Drawings and the mutual NDA follow by reply, and controlled programs never send technical data through this site.
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Questions
Do I need both J-STD-001 and IPC-A-610 on a PCBA order?
Usually yes. J-STD-001 sets the materials, process and soldering requirements, and IPC-A-610 sets the visual acceptance criteria for the finished assembly, including handling and mechanical items the soldering standard does not cover. IPC develops them together. Cite both with revision and class, and add the J-STD-001 space and military addendum when your contract requires it.
Is there a space addendum for PCB assembly?
Yes. J-STD-001JS, the space and military applications addendum released in January 2025, supplements or replaces specific J-STD-001 requirements for assemblies that must survive launch vibration and thermal cycling. It applies only when the procurement documents call for it and is not used on its own. NASA programs may instead impose the NASA workmanship set through NASA-STD-8739.6, so check your mission assurance requirements.
Should I consign parts or let the assembler buy them?
Turnkey puts parts accountability with one party and works well when parts are in production through authorized channels. Consign when parts were bought and screened under your program, come from a controlled parts list or are long lead items you already own. Partial consignment splits the BOM. Whatever you choose, write down who owns shortages, alternates and traceability before the build starts.
What does DFARS 252.246-7008 require for board assemblies?
It requires buying electronic parts from the original manufacturer or its authorized suppliers first, then contractor-approved suppliers, and other sources only with inspection, testing, authentication and written notice to the contracting officer. It also requires risk-based traceability when the buyer is not the manufacturer or an authorized supplier, and it flows down to subcontracts for assemblies containing electronic parts, including commercial ones.
How long can an MSL 3 part sit out before reflow?
J-STD-033C, as reproduced by Texas Instruments, gives MSL 3 parts a floor life of 168 hours at 30 °C once the dry pack is opened. Higher temperature or humidity shortens it, and parts that exceed floor life must be baked before reflow. Ask the assembler how exposure is tracked across shifts and partial reels, and confirm the current J-STD-033 revision.
When is X-ray inspection required on an assembly?
Require it for any part whose solder joints are hidden, such as ball grid arrays, land grid arrays and bottom terminated packages like QFNs, because optical inspection cannot see those joints. IPC-7095, now at revision E, is IPC's guidance for BGA assembly and voiding. Agree on the class, how voids are measured and whether 2D X-ray or 3D CT is needed, and ask for first article images.
Is environmental stress screening needed on flight boards?
Many flight and defense programs require ESS, usually thermal cycling and random vibration on every unit, to precipitate latent defects before delivery. MIL-HDBK-344A gives DoD guidance on planning ESS and remains listed as valid for use, but most programs define their own profiles. Give the profile, cycle count and failure-free period on the RFQ, or reference the document that contains them.
Related
Sources
- DIN Media: IPC-A-610J Acceptability of Electronic Assemblies (2024-03)
- IPC store: addendum listings including J-STD-001JS
- NASA OSMA: updates to NASA-STD-8739.6 (revision B)
- Acquisition.gov: DFARS 252.246-7008 Sources of Electronic Parts
- SAE: AS5553 Counterfeit Electronic Parts
- SAE: AS6171 test methods for suspect counterfeit EEE parts
- CALCE, University of Maryland: a new counterfeit avoidance standard for independent distribution (AS6081A)
- Texas Instruments SLVA840: Power Module MSL Ratings and Reflow Profiles
- Technicke normy: IPC-7095 revision E listing
- IEEE: IEEE 1149.1 Test Access Port and Boundary-Scan Architecture
- EverySpec: MIL-HDBK-344A Notice 2, Environmental Stress Screening of Electronic Equipment
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