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JANUARY 2024 I DESIGN007 MAGAZINE 67 in the same location. is will cause any iso- lated conductors to crack prematurely. However, when conductors are routed and staggered evenly, an isolated stress condition cannot develop. is ensures that no prema- ture failure will occur. In addition, be careful to avoid traversing conductors in the bend area. is can cause additional mechanical stress and can lead to cracking and failing traces. 5. Plan adequately for strain relief fillets. Strain relief fillets are intended to prevent conductors from cracking during installation and are an important part of rigid-flex PCBs. Usually made from a two-part, epoxy-based Figure 4: Note that the robust design is absolutely critical in flexing applications. Figure 5: The purpose of the fillet is to prevent conductors from being cracked when the flex circuit is flexed during installation.