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, as well as validating and testing 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 9-1 shows a model for each load type.

9.2 Typical Application

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

VSUP

VSUP

Figure 9-1. ULN2003A Device as Inductive Load Driver

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 9-1 as the input parameters.

Table 9-1. 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

Output current (RCOIL)

20 mA to 300 mA per channel

Duty cycle

100%

ULN2002A, ULN2003A, ULN2003AI

ULQ2003A, ULN2004A, ULQ2004A

SLRS027Q – DECEMBER 1976 – REVISED JULY 2022

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