The HE391D from BOWEI Integrated Circuits is a RF Amplifier with Frequency 20 to 200 MHz, Gain 10 to 11 dB, Gain Flatness ±0.6 to 1 dB, Noise Figure 4.5 to 6 dB, Output Power 25 to 26 dBm. Tags: Drop-In, Power Amplifier. More details for HE391D can be seen below.