The HMC540LP3 from Analog Devices is a RF Variable Attenuator with Frequency 0 to 5.5 GHz, Attenuation Range 1 to 15 dB, Attenuation Step 15 dB, Power 0.79 W, P1dB 27 dBm. Tags: IC, Programmable, Digital. More details for HMC540LP3 can be seen below.