Effects of electrostatic discharge on GaAs-based HBTs

Short term and long term effects of electrostatic discharge (ESD) on GaAs-based HBTs are described. Both single-finger and multi-finger devices were tested, at ESD levels from 300 to 8000 V. Typically, devices subject to ESD show increasing levels of leakage current and/or decreased breakdown voltages. ESD effects on single and multi-finger devices are discussed, as well as the effects of ballasting. Finally, the results of long-term bias stress on ESD exposed devices is described.