The miniaturized TFDU5107 in the well-known Baby Face package is an ideal transceiver for applications in telecommunications like mobile phones, pagers, and PDAs of all kinds. The devices are designed for optimum performance and minimum package size. The device covers the IrDA physical layer specification up to 1.152 Mbit/s (MIR). A current limiter is implemented to operate the device without external resistor in an IrDA compliant mode ( > 1 m). For reduced current as for the `Low Power` mode a current limiting resistor might be added.