For a PCB and PCBA manufacturer USA buyers can work with directly, options include Sierra Circuits, Gorilla Circuits, and Cirexx. These companies offer domestic fabrication and assembly, with services covering standard FR4 prototypes, complex multilayer boards, and specialized constructions. Small-order availability and HDI capability help distinguish the services within that market.
For projects that allow overseas production, EBest Circuit (Best Technology) combines PCB manufacturing, component sourcing, and assembly in China. Our capabilities include FR4 boards up to 32 layers and BGA assembly down to 0.25 mm pitch, supporting projects from bare-board prototypes to populated assemblies. Discuss your US project with our team at sales@bestpcbs.com, or arrange a factory visit to see our manufacturing operations firsthand.
US PCB Manufacturers Offering Fabrication and Assembly
Sierra Circuits, Gorilla Circuits, and Cirexx each provide both PCB fabrication and assembly. Their service ranges cover different board technologies and production needs.
| Manufacturer | PCB manufacturing | Assembly services |
|---|---|---|
| Sierra Circuits | Standard rigid FR4 and custom advanced boards, including HDI | In-house assembly and component procurement |
| Gorilla Circuits | Multilayer boards, hybrid constructions, and semiconductor test boards | In-house assembly, parts procurement, and testing options |
| Cirexx | Rigid, flex, rigid-flex, HDI, and RF/microwave boards | Turnkey, partial turnkey, and consignment assembly |
Sierra Circuits offers a defined route for conventional prototypes through Turnkey PRO, which combines rigid-board fabrication, parts, and assembly. More complex constructions use its custom services.
Gorilla Circuits fabricates and assembles boards at its San Jose, California campus. Its semiconductor test work includes final-test and probe-card boards, making this a relevant area of experience for buyers sourcing complex test hardware.
Cirexx combines fabrication and assembly within the same facility. Flex and rigid-flex assembly are particular areas of specialization, alongside rigid-board and HDI work.
Do All PCB Manufacturers Offer Assembly?
No. A PCB fabrication order normally supplies bare boards; assembly adds the components. Some manufacturers provide both services, while others specialize in one stage.
- PCB fabrication: bare boards ready for component assembly.
- Consignment assembly: assembled boards using customer-supplied materials.
- Full turnkey PCB assembly: fabrication, component purchasing, and assembly managed by the supplier.
An assembler can also purchase bare boards from a fabrication partner. Consequently, turnkey service does not necessarily mean both processes happen in the same factory.
If you already have an assembly partner, a specialist bare-board manufacturer may fit your project well. If you need finished assemblies and want one point of coordination, a fabrication-and-assembly provider can handle the transition between the two stages.
US Manufacturing vs. Overseas Supply to the USA
US production offers proximity; overseas production broadens the manufacturing options available to US buyers. The balance changes with the way a project is developed and ordered.
| Consideration | US manufacturing | Overseas supply to the USA |
|---|---|---|
| Factory access | Easier domestic visits and sample exchanges | Visits require international travel |
| Engineering communication | Greater overlap with US working hours | Responses span different working hours |
| Shipping | Domestic transport to the customer | International transit before US delivery |
| Repeat orders | Convenient for closely coordinated local production | Can suit scheduled orders with planned shipping |
During active development, proximity can be valuable. A team making frequent revisions may benefit from easier sample exchanges and direct factory interaction. The relevant schedule is the complete cycle from placing a build to evaluating the hardware.
For a stable design, manufacturing fit becomes more prominent. Materials, copper construction, component availability, and the supplier's ability to repeat the build can matter more than how often the team can visit. Overseas production is worth considering when international transport fits that schedule.
Neither location guarantees a lower total price. Compare equivalent finished boards: the same materials, components, assembly scope, and delivery destination. A bare-board quotation and a complete PCBA quotation cover different purchases.
Which US PCB and PCBA Manufacturers Accept Small Orders?
Sierra Circuits, Cirexx, and PCB Unlimited offer services for prototype or low-volume assembly. Their small-order arrangements differ:
| Provider | Small-order service | Relevant option |
|---|---|---|
| Sierra Circuits | Turnkey PRO: generally 2–100 assembled boards, depending on the design | Standard rigid FR4 turnkey builds |
| Cirexx | High-mix, low-quantity assembly; prototype through medium volume | Custom rigid, flex, and rigid-flex projects |
| PCB Unlimited | USA assembly service with no minimum order quantity | Turnkey or customer-supplied-material assembly |
PCB Unlimited offers US assembly services. Sierra and Cirexx also provide in-house board fabrication. For Sierra, confirm availability before planning a one-board assembled order.
A small quantity can still involve a custom board. A five-board rigid-flex project or a four-layer PCB with a specified stackup may need a custom service rather than a standard prototype package.
Small runs also share production preparation across fewer finished boards. Stencil preparation and machine programming are needed even for a short run, so doubling the assembled quantity does not necessarily double the total price. When several engineers need hardware simultaneously, pricing the actual number of working samples can be more useful than starting with the smallest possible order.
Which US Manufacturers Offer HDI PCB Fabrication and Assembly?
Sierra Circuits and Cirexx offer both HDI fabrication and assembly. Their capabilities include the board interconnections and component assembly needed for dense designs.
| Manufacturer | HDI fabrication | Assembly support |
|---|---|---|
| Sierra Circuits | Custom HDI boards with advanced via structures | Turnkey HDI assembly with component sourcing |
| Cirexx | Laser-drilled microvias, blind/buried vias, sequential lamination, and via-in-pad | Double-sided HDI SMT/BGA assembly |
Sierra's HDI projects use its custom manufacturing route. The standard Turnkey PRO package excludes HDI and multiple laminations, so it is a separate service from the company's advanced-board offering.
Cirexx combines HDI fabrication with dense assembly work. Its fabrication processes include laser direct imaging and controlled-depth drilling, while its assembly service covers double-sided SMT/BGA builds and flex or rigid-flex boards.
For a compact BGA board, this combination is important: the fine-pitch package must be supported by a manufacturable routing and via structure beneath it. Choosing a supplier that handles both allows those fabrication and assembly requirements to be addressed together.
How EBest Circuit Supports US PCB and PCBA Buyers
With EBest Circuit, US customers can source bare PCBs, populated boards, or a complete turnkey build through one manufacturing partner. Our PCB manufacturing capabilities cover conventional FR4 and more demanding multilayer constructions.
| Capability | EBest Circuit support |
|---|---|
| FR4 layer count | Up to 32 layers |
| HDI trace width/spacing | Down to 2/2 mil |
| Small-component assembly | Down to 01005 |
| BGA assembly | Down to 0.25 mm pitch |
| Assembly methods | SMT, through-hole, and mixed assembly |
The applicable combination depends on the board construction and component layout.
Keep component purchasing flexible. Our PCB assembly services include full turnkey, partial turnkey, and consignment work. You can use components already held by your team while we source the remaining parts, or have procurement included with the build.
Combine fine-pitch assembly with solder-joint inspection. Fine-pitch placement supports compact layouts, while AOI and X-ray inspection provide complementary checks for visible features and hidden solder joints.
Plan prototype and repeat builds with clear timing. Standard PCBA service is approximately one week, with expedited options for eligible projects. Our production lead times distinguish PCB fabrication from assembly; component procurement and delivery to the USA also need to fit the overall schedule.
Case Study: A 4-Layer Medical PCB for a US Customer
EBest Circuit worked with a US customer on a four-layer FR4 PCB for a medical product. The project required TG170 material, a finished thickness of 1.6764 mm ±10%, and 2 oz finished copper on every layer. The customer's PDF defined the layer structure.
Three requirements gave this board its specific manufacturing character:
- The same finished copper requirement on all four layers. Both inner and outer layers required 2 oz copper. An outer-layer-only 2 oz specification would not describe this board correctly, and the customer's stackup formed part of the required construction.
- Copper retention around non-plated holes. Where a pad was larger than an NPTH, the customer required its position and copper to remain unchanged. Secondary drilling was specified to produce the hole without treating the surrounding pad copper as material to remove.
- A defined PTH copper requirement. Minimum hole-wall copper had to follow IPC-6012 Class 3 requirements. This was a distinct requirement from the 2 oz finished copper specified for the circuit layers.
The board also required lead-free HASL, glossy green solder mask on the top side, and white silkscreen clear of the pads. Routed internal corners had to follow the maximum radii on the drawing.
FAQs About PCB and PCBA manufacturer USA
Can a US assembly company work with overseas-manufactured PCBs?
Yes, if it accepts customer-supplied boards or sources them through a fabrication partner. This arrangement lets you retain a bare-board supplier while assembling closer to your US team.
Can prototype orders use a custom stackup?
Yes. Small quantity and custom construction can be combined. The order needs a service that accepts the specified stackup rather than a package limited to the supplier's standard constructions.
Can I provide some components and have the supplier purchase the rest?
Yes. Partial turnkey assembly supports this arrangement. It is useful when you already hold selected devices but want the manufacturer to procure the remaining components.
Does PCB electrical testing replace PCBA functional testing?
No. Bare-board electrical testing checks circuit connectivity before assembly. Functional testing evaluates the populated board against its intended functions and requires an appropriate test method.
Can EBest Circuit support a US project from bare boards through assembly?
Yes. EBest Circuit provides PCB fabrication, component sourcing, and assembly in China for US customers. The project can be supplied as bare boards or developed into a turnkey assembly order.
Discuss your next PCB or PCBA project with EBest Circuit at sales@bestpcbs.com. If you would like to meet the team and see our production operations before choosing a manufacturing partner, we welcome you to arrange a factory visit. PCB and PCBA manufacturer USA
