San Francisco Circuits

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San Mateo, CA
San Francisco Circuits

Printed Circuit Experts: the one stop solution for PCBs: PCB design, PCB fabrication & assembly.

With the resources of a strong PCB manufacturer's network and the expertise of our team members, San Francisco Circuits provides you with a unique one stop solution to all your PCB needs: PCB design to PCB manufacturing, fabrication & assembly.

05/28/2026

San Francisco Circuits has achieved CMMC Level 2 Certification, independently validated by a C3PAO, confirming compliance with NIST SP 800-171 Rev. 2 for protecting CUI in the Defense Industrial Base.

Now listed in SPRS with verified cybersecurity controls across 110 requirements.

🔗 Explore our capabilities:

SFCircuits has the PCB production capability to handle proto to production runs. Our strength is in fast lead times & advanced technologies for complex layout

04/21/2026

Flying Probe Testing enables fixtureless PCB validation for prototypes, low-volume builds, and dense designs.
Programmable probes test continuity and components directly from CAD data.

Flexible, cost-efficient, and ideal for fast design changes.

🔗 Read more:

Board rejected as untestable? Discover how flying probe testing enables verification for dense HDI, rigid-flex, RF, and multi-board PCB assemblies—without costly fixtures.

03/11/2026

Double sided BGA assembly boosts PCB density without increasing board size while supporting compact, high performance electronics.
This process places BGAs on both sides of the PCB, improving component density up to 50 percent and enabling more complex designs.
🔗 Read more:

San Francisco Circuits guides you through the intricacies of double-sided BGA assembly, from terminology to overcoming warpage and reliability issues.

01/19/2026

Press fit connectors power today’s high density PCB designs and unmanaged strain can lead to hidden failures. 📐
Our latest guide explains PCB strain thresholds, common press fit failure modes, and best practices to improve PCBA reliability. 🔧
🔗 Read the full guide:

Managing strain during press-fit connector insertion is essential for high-density PCB reliability. Discover best practices and how San Francisco Circuits ensures reliable assembly for HDI, mil-spec, and medical applications.

11/12/2025

🔒 System integrators face unique challenges: protecting sensitive design data while delivering high-reliability PCBs. San Francisco Circuits supports secure R&D with NIST & CMMC-compliant manufacturing and rapid prototyping.
Learn more:

Partner with San Francisco Circuits for ITAR-compliant, NIST 800-171 secure PCB manufacturing and assembly. Trusted by system integrators in defense, aerospace, medical, and industrial sectors for precision, reliability, and data protection since 2005.

10/15/2025

⚙️ Heavy copper PCBs use copper weights from 4 to 10 oz per square foot to boost current capacity and heat management. These boards power high-demand systems in defense, aerospace, and industrial electronics.
Learn more about heavy copper boards here:

San Francisco Circuits is an industry-leader in heavy copper PCBs. Up to 10oz/ft², we can turn your copper core PCB order as fast as 72 hours with expert precision. Made in USA.

08/19/2025

Our new PCB Stackup Calculator lets you build and visualize stackups from 4 to 14 layers in just a few clicks.

Start experimenting with your next design today:

San Franciso Circuits PCB Stackup Calculator is a simple design tool to help you design and visualize your multilayer PCB stackup from 4 to 14 layers.

08/07/2025

Check out our latest guide covering via types for multilayer circuit boards.
Understand how different vias enable compact layouts and efficient signal routing.
🔗 Read the full guide:

San Francisco Circuits covers the 8 types of PCB vias including blind, buried, microvias, through-hole, stacked, & thermal vias - what they are, how they work, & where they’re used in advanced PCB design.

07/23/2025

We’ve updated our Flex PCB Capabilities page – one of the most common technologies we work with, from prototypes to full production.

💡 Flex PCBs use ultra-thin polyimide substrates (as slim as 12.5 microns), making them lightweight, bendable, and perfect for tight spaces.

📲 See how we streamline designs without bulky wiring or connectors, and explore new details on turn times, materials, layer stacks, and more.

🔗 Explore now:

San Francisco Circuits is a one-stop provider of flexible PCB fabrication & assembly in prototype & production quantities. Get flex proto fab as fast as 72 hours.

03/20/2025

🔩 It’s ! Thru-hole technology has been the backbone of PCB manufacturing for decades, providing strong electrical connections and mechanical durability. When placing large through-hole connectors or diodes, ensure they are properly oriented to optimize soldering reliability and minimize the risk of improper joints. Additionally, for through-hole diodes, ensure the cathode is clearly marked on the silkscreen to prevent assembly errors. 💡

For a deeper dive into PCB assembly and best practices, check out our guide: https://www.sfcircuits.com/pcb-school/pcb-assembly-drawings-polarities-pin1-anode-cathode-markings

San Francisco Circuits - The Essential Guide to PCB Assembly Drawings: Understanding Polarities, Pin1 Marking & Anode/Cathode Markings. Learn more about understanding the XY File, component locations, & polarized component orientations.

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San Mateo, CA

Website

https://www.sfcircuits.com/

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