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How to attach a clincher connector to a FSR

Electrical Engineering Asked by Cerin on August 9, 2020

How do you attach an Amphenol FCI “clincher connector” to a thin film force sensitive resistor? I see several sites selling these connectors explicitly for making it easier to wire FSRs, but almost no one explains how to attach them.

I found this single very bad “how to” video, but the video resolution is so low, I can’t tell what’s going on. They say to “trim off the leads”, but it’s unclear what that means. Are you supposed to trim off the pins, or the entire metal crimps on the FSR’s default connector before applying the clincher connector? In the video, it looks like they just trim off the pins, and not the metal crimps, but I can’t tell for sure.

One Answer

Those connectors are designed to connect directly to the flexible substrate, so you need to trim off the metal contacts that have already been clinched onto the flexible resistor.

The drawing for the connector shows a section view that illustrates what happens when the connector is installed. Note the two pairs of prongs that pierce the substrate and are clinched down make contact with the conductive areas: Section view of connector in uncrimped and crimped conditions

One thing to note is that, as with many connectors, you can terminate them using a basic pair of pliers, but the connectors are really meant to be installed using specially-designed tools. Pliers may work, but may not result in a reliable or repeatable crimp. The connector datasheet shows the proper installation tools on the last page.

Unfortunately these tools--even the manual hand tools--tend to be very expensive, but they're a worthwhile expense that you should plan for if you intend to do a lot of these terminations on a commercial basis.

Answered by ajb on August 9, 2020

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