The PDC-400M500M-20C-SFF-30W from Planar Monolithics Industries is a Directional Coupler with Frequency 400 to 500 MHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity 0.7 dB, Directivity 20 dB. Tags: Module with Connectors. More details for PDC-400M500M-20C-SFF-30W can be seen below.