Semi flex PCB

Semi flex PCB

Flexible printed circuit boards bring the possibilities for further reduction of size and cost for the digital products. Although the FPC boards produced by PS Electronics possess relatively good mechanical properties, there are still gaps compared with rigid PCBs, FPC boards likely get damaged in some extreme environments. At the same time, its high flexibility is not so good to fine mounting. Therefore, we sometimes attach some rigid materials to somewhere on the FPC boards as stiffeners to strengthen or fix, which in certain cases take more duties, such as heat conduction, connection, increasing thickness, and so on. These make FPC boards become semi flex PCBs.

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PCB Type: Flex PCB	Manufacturer: PS
Base Material: Polyimide	Layer Count: 1-6
Stiffeners: Polyimide, FR4, Metal	Max Board Size: 508×508mm
Min Trace/Spacing: 2/2mil	Min Hole Size: 0.075mm

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Stiffeners	PF	FR4	PET	PI	Metal
Thickness	0.6-2.4mm	0.4-2.4mm	0.025-0.25mm	0.0125-0.125mm	As request
Heat Dissipation	Mid	Good	Weak	Good	Excellent
Mechanical Strength	High	High	Low	Low	High
Flammability (UL94V-0)	Yes	Yes	No	Yes	Yes
Used For	Through-hole parts	SMD with pins	Connector	SMD	SMD

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Q1: Do I have to add stiffeners to the FPCs?

Not really, the stiffeners are not included in the circuit design. If your PCB does not have the rigidity requirements and does not need for an additional thickness, it does not need to be stiffened. In fact, the stiffeners are not allowed to be attached to some high flexible boards.

Q2: Which thicknesses are available for the stiffeners on semi flex PCBs?

It basically depends on specific designs and requirements. Commonly, 0.8mm, 1.0mm or 1.5mm for FR4, 0.1mm for Polyimide.

Q3: What is the lead time for making semi flex PCBs?

Mainly depends on the quantity, prototypes can be delivered within 1-2 week.

Q4: What are needed for the manufacture?

Gerber data (RS-274-X), and special requirements if you have.

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