The ULN2803C device is a 50V, 500mA 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 500mA. The Darlington pairscan 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 ULN2803C device
has a 2.7kΩ series base resistor for each Darlington
pair for operation directly with TTL or 5V CMOS
devices.
