The HMC291SE from Analog Devices is a RF Variable Attenuator with Frequency 0.7 to 4 GHz, Attenuation Range 4 to 12 dB, Attenuation Step 4 dB, Power 27 to 28 dBm (P0.1dB), IIP3 52 to 59 dBm. Tags: Surface Mount, Digital. More details for HMC291SE can be seen below.