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98 DESIGN007 MAGAZINE I APRIL 2021 ere are many possible connectors that are manufactured specifically for use with flexible circuits to connect from a flex circuit to a rigid PCB. Many use typical, military secure twist connectors which require reinforcement of the flex to solder to the connector pins (Figure 1). Also, a good choice is zero insertion force (ZIF) connectors for thin flex to rigid applica- tions. Additionally, pierce type connectors are used (Figure 2). Direct copper fingers which plug into rigid header connectors can be used (Figure 3). Many different types of connectors offer inexpensive and reliable methods to connect a flexible circuit to a rigid PCB. Consideration for flexibility always needs to be addressed. Examine the bend radius and possibly add cover coat reinforcement in higher stress areas. Almost any connector that can be utilized on a rigid PCB can also be installed on a flexible Termination of Flex Circuits Consider This by John Talbot, TRAMONTO CIRCUITS Figure 1: Reinforced flex for soldering to military connector. Figure 2: Pierce type connector for flex to rigid header.