The FAT1804S5SM from Yantel Corporation is a Fixed Attenuator with Frequency DC to 18 GHz, Attenuation 4 dB, Power 5 W, Attenuation Accuracy ±0.8 dB, Operating Temperature -55 to 125 Dergee C. Tags: Module with Connectors. More details for FAT1804S5SM can be seen below.