The ULN2803A 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.
Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line
drivers, and logic buffers. The ULN2803A 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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SPECIFICATION
500-mA Rated Collector Current (Single
Output)
High-Voltage Outputs . . . 50 V
Output Clamp Diodes
Inputs Compatible With Various Types of
Logic
Relay Driver Applications
Compatible with ULN2800A Series
