IN1

IN2

ULN2003A

IN3

IN4

OUT1

OUT2

OUT3

OUT4

IN5

IN6

IN7

GND

OUT5

OUT6

OUT7

COM

3.3-V Logic

3.3-V Logic

3.3-V Logic

14

ULN2002A, ULN2003A, ULN2003AI

ULQ2003A, ULN2004A, ULQ2004A

SLRS027O – DECEMBER 1976 – REVISED JANUARY 2016

www.ti.com

Product Folder Links: ULN2002A ULN2003A ULN2003AI ULQ2003A ULN2004A ULQ2004A

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Copyright © 1976–2016, Texas Instruments Incorporated

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

Typically, the ULN2003A device drives a high-voltage or high-current (or both) peripheral from an MCU or logic

device that cannot tolerate these conditions. This design is a common application of ULN2003A device, driving

inductive loads. This includes motors, solenoids and relays. Figure 22 shows a model for each load type.

9.2 Typical Application

Figure 22. ULN2003A Device as Inductive Load Driver

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 1 as the input parameters.

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

GPIO voltage

3.3 V or 5 V

Coil supply voltage

12 V to 48 V

Number of channels

7

20 mA to 300 mA per channel

Duty cycle

100%