The HE388D-4 from BOWEI Integrated Circuits is a RF Amplifier with Frequency 20 to 600 MHz, Gain 21 to 23 dB, Gain Flatness ±2 dB, Noise Figure 0.6 to 1 dB, Output Power 19 to 20.5 dBm. Tags: Drop-In, Power Amplifier. More details for HE388D-4 can be seen below.