SMT touch switch how to change the mounting position, we summarize a lot of experience, to introduce these aspects of knowledge, please understand and understand in detail.
SMT touch switch is widely used in consumer electronic products and medical handheld devices. Its function needs to be actuated mechanically to turn on the current signal. The failure analysis and verification of SMT touch switch involves not only SMT process, but also mechanical assembly process, testing and reliability testing. Therefore, the failure analysis of SMT touch switch is a great challenge. From the actual failure analysis process, solder joint failure is not the only cause, there are a lot of other factors behind it, so we need to use a variety of failure analysis means and methods.
According to the results of DFA analysis and the recommended scheme, the mounting position of the light touch switch moves inward 150 um, so that the edge of PCB acts as a limit feature to prevent the occurrence of overvoltage of the light touch switch. The result of using special thrust test fixture is that no switch is tilted or peeled. After assembly and disassembly, no bad warping of the switch was found.