Texas Instruments ULN2004AI Data Sheet
Summary
The ULN2004AI is a versatile Darlington transistor array designed to interface low-voltage control signals (like TTL or CMOS) with high-power inductive and resistive loads. This robust device features seven independent outputs for driving relays, lamps, LEDs, and other actuators up to 50V/500mA. The comprehensive technical manual provides circuit designers with essential schematics, detailed operating specifications, absolute maximum ratings, and precise ordering guidance needed to effectively integrate this component into professional electronics systems.
Page 1 Text Content
SLRS055 − APRIL 2004
500-m A-Rated Collector Current D, N, OR NS PACKAGE (TOP VIEW)
(Single Output) High-Voltage Outputs 50 V
Output Clamp Diodes 2B 2C
Inputs Compatible With Various Types of 3B 3C Logic 4B 4C 5B 5C
Relay-Driver Applications
6B 6C description/ordering information 7B 7C COM
The ULN2004AI is a high-voltage, high-current Darlington transistor array. This device consists of seven npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of a single Darlington pair is 500 m A. The Darlington pairs can be paralleled for higher-current capability. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers. The ULN2004AI has a 10.5-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.
ORDERING INFORMATION
ORDERABLE TOP-SIDE
TA PACKAGE†
PART NUMBER MARKING
PDIP (N) Tube of 25 ULN2004AIN ULN2004AIN
Tube of 40 ULN2004AID
−40°C to 105°C SOIC (D) ULN2004AI
Reel of 2500 ULN2004AIDR
SOP (NS) Reel of 2000 ULN2004AINSR ULN2004AI
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
!" #!$% & "' Copyright 2004, Texas Instruments Incorporated
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Page Summary Contents For Texas Instruments ULN2004AI Data Sheet
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 13 |
| File Size | 427.54 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the function of the ULN2004AI device?
It is a Darlington transistor array used for high-voltage, high-current switching applications like relay or lamp drivers.
How is the Darlington pair configured for operation?
Each pair has a 10.5-kΩ series base resistor for direct operation with TTL or 5-V CMOS devices.
What are the operational temperature and storage ranges?
The operating range is -40°C to 105°C, while the storage temperature range is -65°C to 150°C.
Can I increase the current capability of the array?
Yes, the Darlington pairs can be paralleled for higher-current capabilities.