This chapter contains sections titled: Gallium Arsenide Technology and ESD Gallium Arsenide Energy-to-Failure and Power-to-Failure Gallium Arsenide ESD Failures in Active and Passive Elements Gallium Arsenide HBT Devices and ESD Gallium Arsenide HBT-Based Passive Elements Gallium Arsenide Technology Table of Failure Mechanisms Indium Gallium Arsenide and ESD Indium Phosphide (InP) and ESD Summary and Closing Comments Problems References