ULN2003B

IN3

IN4

OUT1

OUT2

OUT3

OUT4

IN5

IN6

IN7

GND

OUT5

OUT6

OUT7

COM

IN1

IN2

3.3V Logic

VSUP

3.3V Logic

3.3V Logic

VSUP

Copyright © 2016, Texas Instruments Incorporated

11

ULN2003B

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SLRS064B – JUNE 2014 – REVISED AUGUST 2016

Product Folder Links: ULN2003B

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8.4 Device Functional Modes

8.4.1 Inductive Load Drive

When the COM pin is tied to the coil supply voltage, ULN2003B is able to drive inductive loads and suppress the

kick-back voltage through the internal free wheeling diodes.

8.4.2 Resistive Load Drive

When driving a resistive load, a pull-up resistor is needed in order for ULN2003B to sink current and for there to

be a logic high level. The COM pin can be left floating for these applications.

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

ULN2003B will typically be used to drive a high voltage and/or current peripheral from an MCU or logic device

that cannot tolerate these conditions. The following design is a common application of ULN2003B, driving

inductive loads. This includes motors, solenoids and relays. Figure 23 is a typical block diagram representation of

this application.

9.2 Typical Application

Figure 23. ULN2003B as Inductive Load Driver