Datasheet

ULN2803
IN3
IN4
OUT1
OUT2
OUT3
OUT4
IN5
IN6
IN7
GND
OUT5
OUT6
OUT7
COM
IN1
IN2
3.3 V Logic
VSUP
3.3 V Logic
3.3 V Logic
VSUP
IN8 OUT8
ULN2803A
www.ti.com SLRS049G –FEBRUARY 1997–REVISED JANUARY 2015
10 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.
10.1 Application Information
ULN2803A 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 ULN2803A, driving
inductive loads. This includes motors, solenoids & relays. Each load type can be modeled by what's seen in
Figure 13.
10.2 Typical Application
Figure 13. ULN2803A as Inductive Load Driver
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