ULN2003AIDRE4

Overview

The ULN2003AIDRE4 is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It integrates seven independent NPN Darlington pairs, each featuring a 2.7 kΩ base series resistor to facilitate direct interfacing with 5 V TTL and CMOS logic circuits. The device provides open-collector outputs capable of sinking up to 500 mA per channel while withstanding collector-emitter voltages of at least 50 V in the off state. Integral clamp diodes are connected to a common cathode pin to suppress inductive voltage spikes from loads such as relays or solenoids. This component is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Integrates seven independent high-voltage Darlington driver channels with built-in base resistors for simplified logic interfacing.
• Features open-collector outputs with high current sinking capability suitable for driving heavy peripheral loads.
• Includes integral freewheeling clamp diodes on a common output terminal to protect against inductive kickback.

Applications

• Driving stepper motors and servo mechanisms requiring sequential phase excitation.
• Actuating electromagnetic relays and solenoids in industrial control systems.
• Powering multiplexed LED displays and incandescent indicator lamps.
• Interfacing microcontrollers with high-power peripheral devices beyond standard logic buffer capabilities.

Procurement Notes

Verify the specific suffix 'E4' against the manufacturer's official documentation to confirm material composition and compliance status. Ensure the SOIC-16 package dimensions match the target PCB footprint. Confirm that the operating temperature range aligns with the intended environmental conditions before finalizing procurement orders.

Selection Notes

Select this component when multiple high-current switching channels are required within a compact surface-mount form factor. It is appropriate for designs needing direct 5 V logic compatibility without external level-shifting components. Consider alternative packages if higher thermal dissipation or different pin configurations are necessary for the specific application layout.

Part Context

This part belongs to the ULN20xxA family of high-voltage Darlington arrays produced by Texas Instruments. The 'D' designation indicates the 16-lead SOIC package, while 'RE4' typically denotes tape-and-reel packaging with specific lead-free material specifications. It shares electrical characteristics with other variants in the series, differing primarily in packaging and termination finishes.

Replacement Considerations

The ULN2003AN serves as a direct through-hole replacement offering identical electrical performance. For surface-mount applications, the ULN2003ADRE4 is an equivalent alternative. Verify pinout compatibility and thermal requirements when substituting these parts in existing designs.