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Flexible circuitry has been used for years in the electrification of instrumentation displays and audio systems. As the complexity of these systems increases, there is a greater need to integrate more functions. Opportunities for integration exist from lighting to full modular assemblies. Modular includes heating, ventilating and air conditioning (HVAC) and audio functions. Flexible circuitry is an attractive power distribution medium for this integration because of its: Ability to mount electronic components directly on to the flex substrate to eliminate satellite boards and connectors. Ability to conform to 3D configurations and package more functions in a smaller area. • “Modular” multilayer capabilities for putting density where needed. Ease of assembly using flex based self aligning or wipe in style connection systems. Ability to directly replace wiring harnesses in most applications. • Lower overall system cost.

Sheldahl is one of the world's largest suppliers of flexible printed circuits (FPC). Sheldahl has been supplying back can FPCs for automotive instrument clusters for over 25 years. The complexity of today's instrument clusters has required higher density and multifunctional FPCs to add value, reduce part number count, increase reliability, reduce electrical interconnects and reduce cost. This paper will discuss some of the new applications that have come about in recent years as a result of technological advances and integrating more functions into the FPC. Single layer, double layer, double sided plated through hole, rigidized flex and hybrid polyester/polyimide FPCs will be discussed.