The HE391B from BOWEI Integrated Circuits is a RF Amplifier with Frequency 20 to 500 MHz, Gain 15 to 16 dB, Gain Flatness ±0.6 to 1 dB, Noise Figure 3.5 to 4.5 dB, Output Power 19 to 19.5 dBm. Tags: Drop-In, Power Amplifier. More details for HE391B can be seen below.