Flexible Circuits

Definition

Flexible Circuits are made from materials allowing for a non-planar positioning within the end product.  Typical materials are polyimide-based, and can go under trade names such as Kapton (DuPont).

Applications

Often flexible circuits are used for applications that have repeated flex cycles, such as cellular phones, doors, etc.  A growing application for flexible circuits are their use as a connector in LED-based lighting systems.  Often, there are two components: a metal substrate LED PCB; an FR-4 based digital driver PCB.  These two devices are often connected with a high profile and sometimes costly connector cable; however, a flexible PCB in its place provides a lower profile, slimmer design, and higher reliability.

To view examples of this technology, scroll down and mouseover thumbnail images.



 

Mouse over pictures below to see description

Flexible Printed Circuit Sample Boards

             
 

Click the enlarged version of the board you are interested in or scroll down and choose from the links below.



Medical Flex Circuit
medical-fpc






Flex Board with stiffener for added flex component support.
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Flexible LED PCB

al-stiffener_flex-led






Flex Circuit with 0.030" non-continuous aluminum stiffener heatsinks.
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Long Cable HDI

flip-chip-array_flex


Flexible Circuit with 16" long cable and blind microvia.
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Stiffeners for Handling

stiffener-tabs-handling






Flex Board with partially-attached stiffener tabs for handling.
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HDI Long Cable
hdi-fpc-cable






Flexible Circuit with blind microvia; 0.004" thickness. 
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Small Flex Board

enig-finish-flex






Flex Circuit with ENIG finish.
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Commercial Flex Board

double-side-flex-circuit






Flex with overhanging / midpoint stiffeners.
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