The ULN2803A device is a 50 V, 500 mA 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.
Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED
and gas discharge), line drivers, and logic buffers. The ULN2803A device has a 2.7-kΩ series base
resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.
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