Sierra Circuits
Silicon Valley PCB fabricator and assembler offering online-quoted standard boards and turnkey builds, with mil-spec and class 3 work by custom quote.
What they do
Sierra Circuits is a Silicon Valley PCB manufacturer that has fabricated boards since 1986. It runs fabrication, procurement and assembly in house, from standard quick-turn boards to advanced high-density and military-grade work.
The company offers three ordering paths: Turnkey PRO for fully assembled boards, standard PCBs ordered online with optional assembly, and advanced boards with a dedicated CAM engineer. Its advanced line covers rigid, flex and rigid-flex boards, HDI features, blind and buried vias, and Class 3 builds to MIL-PRF-31032 and MIL-PRF-55110.
Sierra serves aerospace and defense, automotive, healthcare, consumer and industrial customers, and states that its boards are made in the United States.
Capabilities
PCB fabrication
Fabricates standard, advanced and military-grade rigid, flex and rigid-flex boards, up to 30 layers, built to IPC-6012 Class 3 and MIL-PRF specs.
PCB assembly
Assembles boards to IPC-A-610 Class 2 specs, with component procurement optional.
PCB turnkey
Turnkey PRO covers fabrication, procurement and assembly, with fully assembled PCBs in as fast as 5 days.
Commercial terms
Minimum order
Not stated
Cost tier $$$$ of $$$$, ProductFlo classification
Silicon Valley high-reliability fabricator with AS9100D certification, ITAR registration and Class 3 mil-spec work.
Alternatives
Compare side by side- Summit Interconnect
High-reliability PCB fabricator for aerospace, defense, space and medical programs, with full turnkey assembly.
- SMTC Corporation
Mid-size EMS provider with PCBA and enclosure fabrication across facilities in the US, Canada, Mexico and China.
- Spirit Circuits
UK PCB manufacturer fabricating single-sided through complex multilayer boards in the UK.
- JLCPCB
Online platform with instant quotes for PCB fabrication and assembly, ordered by uploading Gerber and BOM files.
- PCBWay
Online PCB service with instant quotes covering fabrication, assembly, CNC, sheet metal, injection molding and 3D printing.
Sources
Not verified
- moq
Last verified November 7, 2026. Listings are informational and are not endorsements. Cost tiers are ProductFlo's classification, not quotes: confirm pricing, lead time and capability with the vendor.