The ULQ200xA-Q1 devices are high-voltage high-current Darlington transistor arrays. Each
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 ULQ2003A-Q1 has a 2.7-kΩ series base resistor for each Darlington pair, for operation
directly with TTL or 5-V CMOS devices. The ULQ2004A-Q1 has a 10.5-kΩ series base resistor to allow
operation directly from CMOS devices that use supply voltages of 6 V to 15 V. The required input
current of the ULQ2004A-Q1 is below that of the ULQ2003A-Q1.
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