Introduction to Flexible Circuits Assembly


Flexible circuits offer some unique obstacles to the assembly procedure. The assembly products and processes for populating and interconnecting components to a flexible circuits array are basically the same to those made use of for typical rigid boards, however there are some spins called for. The assembly processes variety from extremely basic methods, such as hand-operated part insertion as well as hand-soldering, that necessary little or no fixturing, to completely automated approaches, that usually call for specially-developed, design-specific, committed components.
To pick an assembly process as well as method for flex PCB, it is required to think about a variety of crucial aspects:

– What is the flex circuits base material?
– What kinds of parts will be made use of?
– How many assemblies will be constructed?

These as well as various other important questions must be addressed prior to making the appropriate choices relating to assembly. Relatively simple matters can considerably influence the assembly selection. For instance, it is frequently presumed that polyester circuits can not be used in applications where soldering is required.
This assumption is asserted on that polyester films are known to have a low melt-point and will normally be blatantly misshaped by the soldering process. Nonetheless, when a polyester laminate flex circuits is effectively fixtured, tin-lead soldering can be utilized for signing up with components. A number of major OEMs have actually been doing simply that for years. They possess established methods that supply correct securing to the body of the polyester circuits in process. The distortion of the product can be localized to locations adjacent to the point of connection. With the arrival of sympathetic, however misguided, regulations mandating using lead-free solders, there are significant difficulties in advance, as lead-free solders have melting temperature levels approximately 40 ° C higher than typical tin-lead solders. Sadly, it shows up that conventional tin-lead solders are in fact much more environmentally– pleasant in accumulated according to studies in the US and also Europe, so the law really does double damages. Presuming a future absence of tin-lead solders for soldering polyester, one alternative is to use lowertemperature solders and also one more is to utilize conductive adhesives. The crucial thing is not to restrict one’s reasoning and also to be available to different options.


The assembly procedure for flex PCB adheres to a course just like rigid boards, but with some crucial points of departure. Recognizing the conventional circulation of assembly is beneficial as a factor of usual recommendation.
There are simply a few basic aspects related to and needed for assembly:

– Interconnecting substrates (PCBs or flex PCB).
– Components (ICs, discrete components as well as ports).
– Methods and also materials for signing up with and also cleaning them.

The obstacle is bringing these aspects with each other in a costeffective and also reliable means, which typically means that a high program of automation and also capital investment are called for. A basic flow diagram of the assembly process, illustrating how when the numerous elements are combined to create an assembly.

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