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1 Features

? 500mA-rated collector current (single output)

? High-voltage outputs: 50V

? Output clamp diodes

? Inputs compatible with various types of logic

? Relay-driver applications

2 Applications

? Relay Drivers

? Stepper and DC Brushed Motor Drivers

? Lamp Drivers

? Display Drivers (LED and Gas Discharge)

? Line Drivers

? Logic Buffers

3 Description

The ULx200xA 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 500mA. The Darlington pairs can be paralleled

for higher current capability. Applications include

relay drivers, hammer drivers, lamp drivers, display

drivers (LED and gas discharge), line drivers, and

logic buffers. For 100V (otherwise interchangeable)

versions of the ULx2003A devices, see the SLRS023

data sheet for the SN75468 and SN75469 devices.

The ULN2002A device is designed specifically for use

with 14V to 25V PMOS devices. Each input of this

device has a Zener diode and resistor in series to

control the input current to a safe limit. The ULx2003A

devices have a 2.7kΩ series base resistor for each

Darlington pair for operation directly with TTL or 5V

CMOS devices.

The ULx2004A devices have a 10.5kΩ series base

resistor to allow operation directly from CMOS

devices that use supply voltages of 6V to 15V. The

required input current of the ULx2004A device is

below that of the ULx2003A devices, and the required

voltage is less than that required by the ULN2002A

device.