The HMC658 from Analog Devices is a Fixed Attenuator with Frequency DC to 50 GHz, Attenuation 20 dB, Power 0.31 W, 24.91 dBm, Attenuation Accuracy ±0.5 dB, Operating Temperature -55 to 85 Degree C. Tags: Die. More details for HMC658 can be seen below.