The CHA6251-QKB from United Monolithic Semiconductors is a RF Amplifier with Frequency 17 to 21.5 GHz, Gain 33 to 36 dB (Linear Gain), Saturated Power 2.81 W, Input Power 12 to 17 dBm, Input Power 0.015 to 0.05 W. Tags: Surface Mount, Power Amplifier. More details for CHA6251-QKB can be seen below.