The FAC4309 from Yantel Corporation is a Fixed Attenuator with Frequency DC to 43.5 GHz, Attenuation 9 dB, Power 0.8 to 1.1 W, Attenuation Accuracy ±0.1 to ±0.15 dB, Operating Temperature -45 to 85 Degree C. Tags: Die, Chip, Surface Mount. More details for FAC4309 can be seen below.