Piezoelectric effect in potting resins

The piezoelectric voltages measured under the described conditions are relatively low and would not cause a problem in most applications. It is possible, however, that these voltages could affect the performance of microcircuits that operate at very low power levels. Test equipment that would measure current or power outputs as well as voltage would yield more information. Also a test setup capable of producing much higher shock levels would yield data more representative of the environments to which many potted devices are subjected. The following general conclusions can be drawn from the data: • In all test configurations, higher shock levels produced higher voltage outputs. • The distance between conductive paths in the potted test specimens had no significant effect on the voltage generated. • A silicone conformal coating applied to an embedded assembly will reduce the voltage generated at a given shock level. • Filled systems produced lower peak voltages than the same resin/hardener systems without filler.