The HMC603QS16 from Analog Devices is a RF Variable Attenuator with Frequency 700 MHz to 3.8 GHz, Attenuation Range 0.5 to 15.5 dB, Attenuation Step 15.5 dB, Power 1 W, P1dB 28 to 29 dBm. Tags: IC, Programmable, Digital. More details for HMC603QS16 can be seen below.