The HE321B from BOWEI Integrated Circuits is a RF Amplifier with Frequency 10 to 500 MHz, Gain 25 to 28 dB, Gain Flatness ±0.5 dB, Noise Figure 2 to 2.5 dB, Output Power 3 to 4 dBm. Tags: Drop-In, Power Amplifier. More details for HE321B can be seen below.