The HEM188B from BOWEI Integrated Circuits is a RF Amplifier with Frequency 2 to 4 GHz, Gain 10 to 11 dB, Small Signal Gain 11 dB pk-pk, Gain Flatness ±0.5 dB, Noise Figure 8 dB. Tags: Drop-In, Limiting Amplifier. More details for HEM188B can be seen below.