The CHA6357-QKB from United Monolithic Semiconductors is a RF Amplifier with Frequency 27 to 31 GHz, Gain 28 dB (Linear), Saturated Power 3.98 W, Input Power 14 to 20 dBm, Input Power 0.0251 to 0.1 W. Tags: Surface Mount, Power Amplifier. More details for CHA6357-QKB can be seen below.