A set of E-band power amplifiers (PAs) which support the 71–76 GHz- and 81–86 GHz-bands with a gain of 25 dB and P1dB of greater than 25 dBm is presented. The final stage of each PA MMIC combines four unit amplifiers in parallel. The saturation output power level is between 25 dBm and 30 dBm. The maximum saturation output power level is achieved at the 71 GHz. The unit amplifier for each band is a parallel combination of a pair of 2-stage amplifiers and designated carefully to avoid stray oscillations. The PHEMT epi-wafer was selected among several candidates to employ the maximum current density property. Additionally, the final-stage unit amplifier was constructed so as to suppress the odd-mode excitation. As a result, a stable 1 W-class PA for E-band applications was achieved.