Sierra Circuits, Inc.
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and Engineers since 1986.

ISO 9001:2008 & ISO 13485:2003
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  • HDI PCBs for Semiconductor

    › MCM / Flip Chip / Wirebond

    › 35 Microns trace space

    › New ENEPIG Surface Finish

    › Build-up technology including stacked microvias

    Learn more »
  • HDI PCBs for Medical Devices

    › ISO 13485:2003 Certified

    › 35 Micron trace space

    › Flex / Rigid Flex HDI PCB

    › Full traceability and lot tracking

    Learn more »
  • HDI PCBs for Aerospace

    › High Reliability Testing

    › HATS testing for stacked microvias

    › New ENEPIG Surface Finish

    › Cross Section Reports

    Learn more »
  • HDI PCBs for Military

    › COTS Boards

    › Milspec Certified HDI PCBs

    › ITAR Certified

    › 0.4mm Pitch with stacked microvias

    Learn more »
  • Case Studies

    › ''Read Sierra Circuits’ case studies published by NASA Tech Briefs, The PCB Design Magazine, and Printed Circuit Design & Fab magazine.''

    Learn more »
High Technology Web PCBs,
instant Quote/Order
High Technology No Touch PCBs,
instant Quote/Order


1-10 layers, 5/5 + trace width and space, quick-turn/same day service, prototype quantities to volume order
High Density Interconnect High Density Interconnect HDI PCBs
High Density Interconnect HDI Tools
High Density Interconnect Other High Tech PCBs


Special materials, blind/buried vias, HDI, microelectronics PCBs, microvias, and non-standard features (metal core, plated edge holes, heavy copper, etc.)
Assembly Services PCBs Instant Assembly Quote Instant Quote for Assembly
PCB Assembly Capabilities PCB Assembly Capabilities


SMT & Thruhole Assembly. Complex Assembly, Fast Turn & Low quantity available. Consigned or Turnkey components. Instant online assembly quotes available!

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Please convey to all the Sierra Proto Express team our thanks for a job well done. We received the boards as promised and they are now in use in our production test areas.

Earl B.
Project Administrator,
Siemens Medical Solutions
No Touch Standard PCBs
2 Layer No Touch PCBs
4 Layer No Touch PCBs
6 Layer No Touch PCBs
Web PCBs
2-12 Layers
For other than standard technology, upload your files and get quote by email
HDI Stackup planner
Material Selector
Better DFM
Turn to Low-loss Laminates
IPC-2581 EETimes
Design Choices for Soldermask on Microwave PCBs
A Few Notes about TDR
Behind the Scenes with IPC-2581
PCD&F News Story
A Tale of Two Materials
Sierra Circuits profiled in
High Technology Silicon Valley Journal
High Technology Circuitree Magazine
Sierra Circuits Flyer
Sierra provides ENEPIG finish
Press Releases
PCB Assembly Services
Company/Capability Brochure