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Flex PCB

Flex PCBs Defined

A Flex PCB or FPCB is a patterned arrangement of printed circuitry and components that utilizes flexible based material with or without flexible coverlay. These flexible electronic assemblies may be fabricated using the same components used for rigid printed circuit boards, but allowing the board to conform to a desired shape (flex) during its application.

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Flexible PCB / FPCB Applications

FPCBs are used widely in everyday technology and electronics in addition to high-end, complex completed components. A few of the most prominent examples of flexible circuits usage is in modern portable electronics, devices, hard disk drives and desktop printers.

Flexible circuits are also used extensively in other applications and industries including:

  • Communications
  • Consumer Electronics
  • Automotive
  • Medical
  • Industrial
  • Aerospace
  • Military
  • Transportation

In transportation they are extensively used due to their improved resistance to vibrations and movement.

Flex PCB cover

Flex Cover
Photo Credit: Robert Tarzwell

Our Capabilities

We can turn your flexible PCB manufacturing order in as quick as 24 hours.

Call us at 800.SFC.5143 or get an instant PCB quote.

We are ready and eager to turn your concepts into reality.

Specifications Capabilities
Drill to copper – Outer layers 8 mil
Drill to copper – Inner layers 10 mil
Copper Thickness 0.5 oz - 4 oz
Minimum Hole Size 0.004"
Minimum Trace/Space 0.003"/0.003"
Minimum Pitch 0.5 mm
Copper to board edge 0.007"
Coverlay Opening 0.003"
Coverlay Web (Kapton) 0.006"

Heavy Copper Flex Circuit Boards

San Francisco Circuits can provide heavy copper flex circuit boards that can also be coupled with flexible thin copper layers designed to handle heavier power currents. Your heavy copper boards can be built with flex portions for lower voltage additions and applications.

Heavy Copper Flex PCB

Heavy Copper Flex PCB
Photo Credit: Robert Tarzwell

Double-Sided & Multi-Layer Flex PCBs

Whether you're looking for a double sided flex circuit or complex multi layer flexible PCBs from your flex PCB manufacturer, we can provide you with the guidance, expertise and capabilities to bring your concept to reality. Multi-layer flex boards are being used more often in electronic applications for higher speed performance but at a loss of flexibility. Single-sided or double-sided multi layer flex PCBs can be designed in unique and complex layouts, with a much greater possibility of combinations compared to FR4 board design. Just as multi-layer FR4 boards, the multi layer FPCBs can be designed using blind and buried vias as well as plated through holes (PTH).

Our strong network of manufacturers can push the limits on PCB fabrication technology, with very fine 1 mil traces, RF PCB or HDI PCB technology and more!

Some Benefits of Flexible PCBs

The primary benefits of flexible circuits compared to traditional cabling and rigid boards include the following benefits listed below. Read our full list of the advantages of Flex PCBs.
Flex boards benefits include:

  • Reduced wiring errors
  • Elimination of mechanical connectors
  • Unparalleled design flexibility
  • Higher circuit density
  • More robust operating temperature range
  • Stronger signal quality
  • Improved reliability and impedance control
  • Size and weight reduction

Flex PCB disadvantages also exist:

  • Higher material cost than rigid or rigid flex PCB
  • Low temperature ability in flex circuits
  • More difficult & complex assembly
  • Easily damaged through improper handling (easy to bend and dent)
  • Sensitive to scratching
  • Difficult or impossible to repair once damaged
  • Requires proper storage conditions (sulfur free plastic)

To ensure the highest quality of your flexible circuit board, we also offer thermal cycling and shock testing to ensure proper usage in the desired environment. PCB burn in testing is available for all SFC-provided boards. We can also provide PCB assembly for all circuit board types.

Flex Circuit Flexible Circuit Flexible PCB

Flexible Circuit Boards
Photo Credits: Robert Tarzwell

Flex PCB fabrication with San Francisco Circuits

Because of a strong network with the best flex PCB manufacturers, San Francisco Circuits can provide our customers with flex printed circuit boards with a great variety of technologies, from simple single-sided flex boards to complex multilayer flex, from commercial applications to high reliability military PCB. We can turn your flex PCBs as fast as in 24 hours, depending on technologies. If you’re looking for production quantities of flex or a flex pcb prototype, SFC’s experts are there to assist with every step of the process at the best value.

Call us at 800.SFC.5143 or get an instant PCB quote. Tell our experts what you need and we will provide you with the right PCB production and assembly solution. We are ready and eager to turn your concepts into reality.

Call us: 1-800-SFC-5143

Or EMAIL US to discuss & quote your project

San Francisco Circuits, Inc.

1660 S Amphlett Blvd #200
San Mateo,CA 94402
Toll-Free: (800)732-5143


San Francisco Circuits - San Diego

3914 Murphy Canyon Rd., Suite A244
San Diego, CA 92123
Local: (858)576-7202

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Latest News


Whether it’s a simple bare board for continuity and netlist testing or functional test of an assembled board, tests are always strongly recommended. We offer a wide variety of PCB testing and inspections for all boards we provide - both bare board fabrication and assembled PCBs. Check out our updated PCB testing & inspection capabilities.

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How many parts need to be ordered for your assembled boards? This is a question we hear on nearly every PCB assembly project we undertake. Our overage cheat sheet below will help you know how many of each component size need to be ordered and at what quantity.

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