The HMC542ALP4 from Analog Devices is a RF Variable Attenuator with Frequency 0 to 3 GHz, Attenuation Range 0.5 to 31.5 dB, Attenuation Step 31.5 dB, Power 0.1 W, P1dB 20 dBm. Tags: IC, Programmable, Digital. More details for HMC542ALP4 can be seen below.