ULN2004ANS

Overview

The ULN2004ANS is a high-voltage, high-current NPN Darlington transistor array manufactured by Texas Instruments. It integrates seven independent open-collector Darlington pairs within a single 16-pin SOIC package. Each channel supports a continuous collector current of 500 mA and withstands peak currents up to 600 mA, with a maximum collector-emitter voltage rating of 50 V. The device features integrated suppression diodes connected to a common cathode for driving inductive loads. It includes 10.5 kΩ series base resistors per channel, enabling direct interface with CMOS logic families operating between 6 V and 15 V.

Feature Summary

• Integrates seven independent NPN Darlington pairs with common emitter configuration
• Includes internal suppression diodes for safe switching of inductive loads
• Features 10.5 kΩ base resistors optimized for direct CMOS input compatibility
• Allows output paralleling to achieve higher aggregate current capacity

Applications

• Relay driver circuits
• Stepper motor and DC brushed motor drivers
• LED and gas discharge tube display drivers
• High-power logic buffers and line drivers

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and tape-and-reel specifications. Ensure the component meets RoHS compliance requirements if applicable to the design. Cross-reference the manufacturer part number with authorized distributors to confirm current production status and availability constraints.

Selection Notes

Select this component when interfacing 6 V to 15 V CMOS logic with high-voltage or high-current loads requiring isolation. The integrated base resistors simplify drive circuit design compared to arrays without them. Consider thermal dissipation capabilities when paralleling outputs or operating near the maximum temperature limits in enclosed environments.

Part Context

This component belongs to the ULx200xA family of high-voltage Darlington arrays from Texas Instruments. Unlike the ULN2003A which targets TTL/5V CMOS, the ULN2004A variant is specifically designed for higher voltage CMOS and PMOS interfaces. The 'NS' suffix typically denotes the small-outline integrated circuit (SOIC) surface-mount package variant within the product line.

Replacement Considerations

The ULN2004AD serves as a pin-compatible alternative in the same SOIC-16 package. Other family members like ULN2003A differ in base resistance and logic voltage compatibility. Verify electrical parameters and package dimensions before substituting.