The BGA2851 from NXP Semiconductors is a RF Amplifier with Frequency 0.25 to 2.15 GHz, Gain 23.1 to 25.5 dB, Noise Figure 2.6 to 4.5 dB, Output Power -5.5 to 0 dBm, Output Power 0.00028 to 0.001 W. Tags: Surface Mount, Power Amplifier. More details for BGA2851 can be seen below.