The ULN2803A device is a high-voltage, high-current Darlington transistor array. The device consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. The Darlington pairs may be connected in parallel for higher current capability.
ULN2803A Datasheet PDF Download :
Others datasheet of same file : ULN2803, ULN2803A, ULN2803AFW, ULN2803AP, ULN2804