BCDA 50Ω High Power Bi-Directional Couplers Mini-Circuits BCDA 50Ω High Power Bi-Directional Couplers are hermetically-sealed, four-port couplers operating in the DC passband and a -55°C to +100°C temperature range. The BCDA Bi-Directional Couplers feature minimal variation with temperature fluctuation and excellent power handling capabilities and the DC current through input to output is 0.25A maximum at 1.0W RF input power. Applications include wireless communications, defense, ISM, MDS, PCS, GPS, and more.