ULN2803A is a high-voltage, high-current Darlington transistor array containing eight NPN Darlington pairs, commonly used to interface low-power logic (like 5V TTL/CMOS microcontrollers) with high-power loads. Each pair handles up to 500mA and 50V, featuring internal clamp diodes for inductive loads like relays, motors, and lamps.
Maximum voltage allowed between COLLECTOR and EMITTER of each DARLINGTON TRANSISTOR: 50V
Maximum current allowed trough COLLECTOR of each DARLINGTON TRANSISTOR: 500mA
Maximum voltage allowed between BASE and EMITTER of each DARLINGTON TRANSISTOR: 30V
Maximum current allowed trough FLYBACK DIODE of each DARLINGTON TRANSISTOR: 500mA
Typical Rise Time: 130ns
Typical Fall Time: 20us
Operating temperature: -65°C to 150 °C
No additional power needed to be applied for chip for making it work.