The SFD175185-P21 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 17.5 to 18.5 GHz, Gain 28 dB (Linear Gain), Power Gain 21 dB, Output Power 21 dBm, Output Power 0.13 W. Tags: Chip, Power Amplifier. More details for SFD175185-P21 can be seen below.