The HMC540SLP3E from Analog Devices is a RF Variable Attenuator with Frequency 0.1 to 8 GHz, Attenuation Range 1 to 15 dB, Attenuation Step 1 dB, Attenuation Accuracy ±0.2 dB, Power 31 dBm (P0.1dB). Tags: Surface Mount, Digital. More details for HMC540SLP3E can be seen below.