The AT20-0263 from MACOM is a RF Variable Attenuator with Frequency DC to 2 GHz, Attenuation Range 0 to 31 dB, Attenuation Step 1 dB, Power 0.1 to 0.63 W (20 to 28 dBm), P1dB 20 to 28 dBm. Tags: Surface Mount, Digital. More details for AT20-0263 can be seen below.