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- The ULN2003 is a monolithic IC consists of seven NPN darlington transistor pairs with high voltage and current capability.
- It is commonly used for applications such as relay drivers, motor, display drivers, led lamp drivers, logic buffers, line drivers, hammer drivers and other high voltage current applications.
- It consists of common cathode clamp diodes for each NPN darlington pair which makes this driver IC useful for switching inductive loads.
- Note that the driver provides open collector output, so it can only sink current, cannot source. Thus when a 5V is given to 1B terminal, 1C terminal will be connected to ground via darlington pair and the maximum current that it can handle is 500A.