The HE641 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 1000 to 3500 MHz, Gain 15 to 16 dB, Gain Flatness ±1.5 dB, Noise Figure 3 dB, Output Power 19 to 20 dBm. Tags: Power Amplifier. More details for HE641 can be seen below.