Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Channels | 7 NPN Darlington pairs |
| Collector Voltage | 50 V |
| Current | 500 mA single-output class |
| Input Resistors | 10.5 kΩ per channel |
| Input Intent | Designed for higher-voltage CMOS drive, approximately 6–15 V logic use cases |
| Clamp | Integrated common-cathode inductive clamp diodes |
| Output | Low-side Darlington sinks |
| Exact Package / Packing | SOIC (D), 16 pins; 2500-piece large reel |
Product Overview
ULN2004ADR shares the seven-channel 50-V Darlington output structure of ULN2003A but changes the input network to 10.5 kΩ. That larger resistor is intended for higher-voltage CMOS control rather than direct TTL/5-V logic optimization.
This input-resistor difference is the primary electrical reason to select ULN2004A instead of ULN2003A. Treating the two as identical can leave too little or too much base current depending on the controller voltage.
The exact ADR suffix is the SOIC-16, 2500-piece large-reel implementation. Inductive clamp and package-dissipation constraints remain similar to the wider ULN200x family.
For related devices, see HKEQGOO’s Bipolar Transistor Arrays category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | ULN2004ADR |
| Channels | 7 NPN Darlington pairs |
| Collector Voltage | 50 V |
| Current | 500 mA single-output class |
| Input Resistors | 10.5 kΩ per channel |
| Input Intent | Designed for higher-voltage CMOS drive, approximately 6–15 V logic use cases |
| Clamp | Integrated common-cathode inductive clamp diodes |
| Output | Low-side Darlington sinks |
| Exact Package / Packing | SOIC (D), 16 pins; 2500-piece large reel |
| Manufacturer Status | Active / Production |
| Part Marking | ULN2004A family marking per TI package addendum |
Functional Highlights
10.5-kΩ inputs suit higher-voltage CMOS controllers
A 12–15 V logic/output stage can drive the array without excessive base current through the lower-value ULN2003 input network.
Output architecture remains familiar
Relay/solenoid wiring and COM clamp behavior follow the classic ULN200x low-side approach.
Design Considerations
- Do not use ULN2004 as a blind drop-in for weak 3.3/5-V logic without checking input current and output saturation.
- Calculate Darlington heat for the actual collector current and number of active channels.
- Connect COM only according to inductive-load clamp requirements.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists ULN2004ADR as Active / Production exact ULN2004ADR; SOIC (D), 16 pins; 2500-piece large tape and reel.
Related Engineering Resources
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