Stress'n The Little Stuff

摘要

Is there a Web site, article, or book that has different copper trace fractures in flex circuits? I have a flex circuit with broken Cu trace in the zero insertion force (Z/F) connector section, which is reinforced with polyamide stiffener (Figure 1). What would be the potential root causes for this type of failure? Adjacent trace looks ok. Sorry to say I am not aware of a ^ book showing different copper trace fractures, although I can tell you every good flex design engineer has his or her own collection of pictures of what can go wrong. Even IPC has little published showing typical fractures. Let's look at your application and a similar one and see if we can address the question of root cause (and I promise I'll share a photo or two from my past).