The ULN2803 is a Darlington transistor array manufactured by Belling. It has 18 pins and is ROHS compliant. The ULN2803 has 18 matched resistors that enable it to achieve exponential gain. This array is composed of eight high-voltage, high-current Darlington transistors.The ULN2803 has a rating of 50uA @50V 3V @2V, 300mA 1.7V @350mA 0.93mA @3.85V 65uA @50V, 500uA 50uA @50V with an operating temperature range of -30? to 105? and a capacitance of 15pF. It is suitable for applications such as controlling relays, motors, linear and switching power supplies, and other inductive loads.