The AK0405CB from Barry Industries is a Fixed Attenuator with Frequency DC to 4000 MHz, Attenuation Metaliztion: SnPb over Ni over Ag, Heat Sink Temperature: 100°C, Input Return Loss: 20 - 23 dB, Output Return Loss: 20 - 23 dB, Power 0.15 W. Tags: Chip. More details for AK0405CB can be seen below.