ULN2803A Driver IC
ULN2803A is a one of the most commonly used High Current, High Voltage Darlington Transistor Array IC. It contains 8 NPN darlington pairs with common cathode clamp diodes for each outputs for switching inductive loads. The current rating of each darlington pair is 500mA and you may connect two or more darlington pairs in parallel to increase current capability. This IC is commonly used in applications such as Relay Driving, Hammer Driving, Lamp Driving, LED and Gas Discharge Display Driving etc.
ULN2803A Relay Stepper Motor Driver
This is a high voltage, high current driver board made using the IC ULN2803, which consists of 8 NPN Darlington Transistor Array with Common Cathode clamp diodes for switching Inductive Loads. Each darlington pairs can drive currents up to 500mA and they may be connected in parallel for higher current capability.