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ULN2803A
SLRS049H – FEBRUARY 1997 – REVISED FEBRUARY 2017
ULN2803A Darlington Transistor Arrays
1 Features
3 Description

The ULN2803A device is a 50 V, 500 mA Darlington
transistor array. The device consists of eight NPN
Darlington pairs that feature high-voltage outputs with
common-cathode clamp diodes for switching
inductive loads. The collector-current rating of each
Darlington pair is 500 mA. The Darlington pairs may
be connected in parallel for higher current capability.
1



500-mA-Rated Collector Current
(Single Output)
High-Voltage Outputs: 50 V
Output Clamp Diodes
Inputs Compatible With Various Types of Logic
2 Applications









Relay Drivers
Hammer Drivers
Lamp Drivers
Display Drivers (LED and Gas Discharge)
Line Drivers
Logic Buffers
Stepper Motors
IP Camera
HVAC Valve and LED Dot Matrix
Applications include relay drivers, hammer drivers,
lamp drivers, display drivers (LED and gas
discharge), line drivers, and logic buffers. The
ULN2803A device has a 2.7-kΩ series base resistor
for each Darlington pair for operation directly with
TTL or 5-V CMOS devices.
Device Information(1)
PART NUMBER
ULN2803ADW
PACKAGE
SOIC (18)
BODY SIZE (NOM)
11.55 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Logic Diagram
1
18
1B
1C
2
17
2B
2C
3
16
3B
3C
4
15
4B
4C
5
14
5B
5C
6
13
6B
6C
7
12
7B
7C
8
11
8B
8C
10