ULN2003ADRG4 Equivalent & Substitute Parts

Part Overview

The ULN2003ADRG4 is a 7-channel NPN Darlington power switch/driver manufactured by Texas Instruments, designed for relay and solenoid driving applications. This component features a 1:1 input-to-output ratio with low-side output configuration, rated for 50V maximum load voltage and 500mA maximum output current per channel in a 16-SOIC surface mount package.

The ULN2003ADRG4 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Number of Outputs	7
Ratio - Input:Output	1:1
Output Configuration	Low Side
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Interface	Parallel
Input Type	Inverting
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ULN2003ADRG4 is determined by the following critical parameters:

7 output channels with 1:1 input-to-output ratio
Low-side output configuration with inverting input type
50V maximum load voltage and 500mA maximum output current
16-SOIC package with surface mount technology
Parallel interface for digital control
ROHS3 compliance and MSL 1 rating

Substitute parts must maintain these electrical and mechanical specifications. Variations in output type (Darlington vs. NPN), operating temperature range, and manufacturer do not disqualify substitution when all primary parameters align.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Load (Max)	Current - Output (Max)	Operating Temperature	Package	RoHS Status
ULN2003ADRG4	Texas Instruments	Obsolete	Darlington	50V	500mA	-40°C ~ 70°C	16-SOIC	ROHS3
ULN2003ADR	Texas Instruments	Active	Darlington	50V	500mA	-40°C ~ 70°C	16-SOIC	ROHS3
MC1413DR2G	onsemi	Active	Darlington	50V	500mA	-40°C ~ 150°C	16-SOIC	ROHS3
ULN2001D1013TR	STMicroelectronics	Active	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	ROHS3
ULN2002D1013TR	STMicroelectronics	Active	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	ROHS3
ULN2003D1013TR	STMicroelectronics	Active	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	ROHS3
ULN2004AS16-13	Diodes Incorporated	Active	NPN	50V	500mA	-40°C ~ 105°C	16-SOIC	ROHS3
ULN2004D1013TR	STMicroelectronics	Active	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	ROHS3
ULQ2003ADR2G	onsemi	Active	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	ROHS3
ULQ2003D1013TR	STMicroelectronics	Active	Darlington	50V	500mA	-40°C ~ 150°C	16-SOIC	ROHS3
ULQ2003D1013TRY	STMicroelectronics	Active	Darlington	50V	500mA	-40°C ~ 150°C	16-SOIC	ROHS3

Engineering Selection Recommendations

Primary Recommendation: ULN2003ADR (Texas Instruments)

The ULN2003ADR is the direct active equivalent from the original manufacturer. It maintains identical electrical specifications, output type (Darlington), and package configuration. This part is in active production with extensive inventory availability (1,005,200 units), ensuring long-term supply continuity. ROHS3 compliance and MSL 1 rating match the original specification.

Secondary Recommendations:

ULN2003D1013TR (STMicroelectronics) provides an active alternative with identical core specifications and extended operating temperature range (-40°C to 85°C). Inventory availability is substantial (1,787,200 units).

MC1413DR2G (onsemi) and ULQ2003D1013TR (STMicroelectronics) offer extended operating temperature ranges (-40°C to 150°C), suitable for applications requiring higher thermal performance. Both maintain Darlington output type and 50V/500mA ratings.

ULN2001D1013TR, ULN2002D1013TR, ULN2004AS16-13, and ULN2004D1013TR are functionally equivalent with NPN output type instead of Darlington. These parts are suitable for applications where output type variation does not affect circuit performance. All maintain 50V/500mA electrical specifications and 16-SOIC packaging.

ULQ2003D1013TRY includes automotive-grade qualification (AEC-Q100) and is suitable for automotive and harsh-environment applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute ULN2003ADRG4 with ULN2003ADR?

A: Yes. ULN2003ADR is the active production equivalent from Texas Instruments with identical electrical and mechanical specifications. It is the recommended direct replacement.

Q: What is the difference between Darlington and NPN output types in these parts?

A: Darlington output types (ULN2003, ULQ2003 series) feature higher current gain and lower saturation voltage. NPN output types (ULN2001, ULN2002, ULN2004 series) have different switching characteristics. Both are functionally equivalent for relay and solenoid driving when circuit design accommodates the output type difference.

Q: Are all substitute parts in the same 16-SOIC package?

A: Yes. All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts.

Q: Do all substitute parts meet ROHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original specification.

Q: Which substitute part has the widest operating temperature range?

A: MC1413DR2G, ULQ2003D1013TR, and ULQ2003D1013TRY all support -40°C to 150°C operating temperature range, compared to the original -40°C to 70°C specification.

Q: Can I use ULN2004 series parts as substitutes?

A: Yes. ULN2004AS16-13 and ULN2004D1013TR are functionally equivalent with NPN output type. They maintain 50V/500mA specifications and 16-SOIC packaging. Verify circuit compatibility with NPN output characteristics.

Q: Is ULQ2003D1013TRY suitable for automotive applications?

A: Yes. ULQ2003D1013TRY carries AEC-Q100 automotive qualification and is suitable for automotive and mission-critical applications requiring enhanced reliability standards.

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