The B1603S with SMD RJ45 Transformer ROHS is a passive component made by CND-tek. It is an electrical connector used to convert signals between two or more circuits using a RJ45 interface. It is a surface mounted device (SMD) with RoHS (restriction of hazardous substance) compliance. It is used to convert electrical signals of 100Base-T networks, ISDN and Ethernet networks between balanced and unbalanced circuits, and has a wide frequency bandwidth of 10 to 250MHz. It is a two-port bidirectional transformer with a primar current of 300mA and an insertion loss of 0.8dB. It is resistant to shock and vibration and has an operating temperature range of -40 to +85°C.