The PE94302 is a high linearity, 6-bit UltraCMOSTM RF Digital Step Attenuator (DSA) specifically optimized for rad-hard space applications. This 50-ohm RF DSA covers a 31.5 dB attenuation range in 0.5 dB steps. It provides both parallel and serial CMOS control interface which operate on a single 3-volt supply. It also has a unique control interface that allows the user to select an initial attenuation state at power-up. The PE 94302 maintains high attenuation accuracy over frequency and temperature and exhibits very low insertion loss and power consumption.