ULN2003AIDRG4

Overview

The ULN2003AIDRG4 is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It integrates seven independent Darlington pairs, each with a continuous load current rating of 500 mA and an output voltage capability of up to 50 V in the OFF state. The device features integral clamp diodes across each input and output to suppress inductive kickback from loads such as relays or solenoids. Series input resistors are included for direct interfacing with 5 V TTL or CMOS logic families. It is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package with a wide operating temperature range.

Feature Summary

• Integrates seven high-voltage Darlington driver channels within a single compact package
• Includes internal flyback diodes to protect against inductive load switching transients
• Features built-in base resistors enabling direct connection to standard digital logic outputs

Applications

• Driving electromagnetic relays and contactors
• Controlling stepper motors and servo actuators
• Powering solenoids and magnetic print hammers
• Multiplexed LED and incandescent display drivers

Procurement Notes

Verify the specific ordering suffix 'DRG4' corresponds to the tape-and-reel packaging format required for automated surface-mount assembly processes. Confirm that the component meets RoHS compliance standards and lead-free manufacturing requirements mandated by the target application's regulatory framework before finalizing procurement orders.

Selection Notes

Select this component when the design requires driving multiple inductive loads directly from low-power microcontroller pins without external buffering. Ensure the total power dissipation remains within thermal limits if multiple channels operate simultaneously at high duty cycles. Verify that the 50 V collector-emitter breakdown voltage exceeds the maximum supply voltage of the connected peripheral equipment.

Part Context

This part belongs to the ULN20xxA series of high-voltage Darlington arrays produced by Texas Instruments. It shares electrical characteristics with the through-hole ULN2003AN variant but utilizes a surface-mount SOIC package. The device serves as a bridge between low-level logic circuitry and higher-power peripheral loads, simplifying interface designs by consolidating discrete driver components into one integrated circuit.

Replacement Considerations

The ULN2003ADWR is a pin-compatible alternative offered by Texas Instruments in a similar surface-mount form factor. Other manufacturers produce electrically equivalent Darlington arrays, though input resistor values and thermal performance specifications should be compared carefully to ensure functional compatibility.