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Sierra Circuits
Best-in-Class PCB Fabrication, Assembly, & Components.
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PCB Assembly in Silicon Valley

Avoid component procurement delays by using a single vendor to source your parts. Transparent pricing. Fast turn-times. Perfectly tailored to your business.

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Product image 1: PCB Assembly

PCBs assembled in the United States

Whether you need a few quick turn prototypes or a few thousand production boards, Sierra Circuits offers one-stop PCB assembly services for your boards at the scale you need.

  • SMT assembly
  • BGA assembly
  • Through-hole assembly
  • Mixed assembly
  • Rigid-flex printed circuit board assembly

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Product Promise

We source components from chip manufacturers across the globe, including Mouser, Digi-Key, Arrow Electronics and others. We also warehouse a significant inventory of common parts. If we cannot source a specific component, our engineers will make recommendations for fair-price alternatives.


General assembly capabilities

  • BGA, micro-BGA, QFN, CSP and any leadless devices up to .35mm pitch assembly with 100% 3D X-ray inspection
  • PCB components, including all types of BGAs, QFNs, CSPs, 0201, 01005, 08004, POP, and press fit components in small quantities
  • DFA process identifies almost all manufacturing issues before actual assembly saving production holdups
  • RoHS, leaded, indium, clean & no clean chemistries
  • Paste in-hole
  • De-ionized water cleaning of assembled boards

Full turnkey PCBs

Sierra Circuits creates an unbroken thread from design to delivery. Receive a complete quote for fabrication, assembly, and components—entirely online. Our white-glove service brings your product to life.

Partially consigned assembly

Some parts provided by the designer — we will source the rest. Sierra Circuits will work with your supply chain to get your PCBs assembled and to market quickly.

Consigned assembly

All components are provided by the PCB designer. Sierra Circuits will fully assemble your PCBs and ship them to you. Quick turn times available, with fully transparent pricing.


One-stop PCB assembly services, capabilities, and testing

We source components from chip manufacturers across the globe, including Mouser, Digi-Key, Arrow Electronics and others. We also warehouse a significant inventory of common parts. If we cannot source a specific component, our engineers will make recommendations for fair-price alternatives.

Assembly services

  • NPI: New product introduction
  • SMT: Surface mount assembly, single & double-sided
  • Plated through-hole: Selective soldering
  • Mixed technologies: SMT, through-hole, electro-mechanical assembly

PCBA testing

  • Flying probe test including boundary scan
  • Functional test: Board & system level test including engineering support for developing test platforms

Engineering services

  • DFM, DFT, DOE
  • Develop control plans & pFMEA
  • Value add engineering services

Other value-add services

With our strategic partners, Sierra Circuits expertise extends to the following:

  • Reliability test includes temperature cycling
  • Wire bonding
  • Conformal coat
  • ICT: Develop test fixtures and testing with our key partners

Trusted by innovators

Engineers and PCB designers at the world’s most innovative companies choose Sierra Circuits for the highest quality one-stop PCB assembly services, right here in the USA.

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Product Image 2: PCB Assembly

Fully assembled PCBs that work the first time. Ready to ship in as quick as 24 hours.

Whether you’re an aerospace engineer on a tight deadline or a procurement officer looking to simplify your supply chain, Sierra Circuits technicians are an integrated part of the most dependable full-service team in the world.

Ideal for:
  • PCB designers and electrical engineers building prototypes or bringing products to market
  • Contract manufacturers who need fast, predictable lead times
  • Purchasing teams who require pricing and supply-chain transparency
  • Tinkerers, hobbyists, and builders who would benefit from the expertise of our in-house CAM engineers

Upload your BOM for an Online Quote

Sierra Circuits is headquartered in Silicon Valley.  We welcome visitors at our 70,000 sqft facility,  located at 1108 West Evelyn Avenue in Sunnyvale, California. Book a tour with an account manager today! Let us introduce you to one of the most innovative communities of engineers and designers in the world. We can help you plan your project from design to assembled board.

Manufacturing Equipment at Sierra Circuits

Our 70,000 sqft state-of-the-art campus in the heart of Silicon Valley contains the most advanced equipment required for the manufacture and assembly of your PCBs. Whether you're looking for standard quick turn PCBs or boards with the tightest tolerances, made from exotic metals, there's a reason Sierra Circuits leads the industry in quality and performance.

Talk to a Sierra Circuits PCB Expert today

24 hours a day, 7 days a week.