The AT-357-SMA from MACOM is a RF Variable Attenuator with Frequency DC to 2 GHz, Attenuation Range 0 to 31 dB, Attenuation Step 1 dB, Attenuation Accuracy ±0.2 dB, Power 0.031 to 0.63 W (15 to 28 dBm). Tags: Module with Connectors, Digital. More details for AT-357-SMA can be seen below.