The MGA-31389 from Broadcom is a RF Amplifier with Frequency 900 MHz, Gain 20 to 23 dB, Noise Figure 2 dB, Output Power 20.6 to 21.7 dBm, Output Power 0.11 to 0.15 W. Tags: Surface Mount, Gain Block, Driver Amplifier. More details for MGA-31389 can be seen below.