The ULN2003B device is a high-voltage, high-current Darlington transistor array. This
device consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode
clamp diodes for switching inductive loads. The collector-current rating of a single Darlington
pair is 500 mA. The Darlington pairs can be paralleled for higher current capability.
The ULN2003B has a 2.7-kΩ series base resistor for each Darlington pair for operation
directly with TTL or CMOS devices.
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