ULN2003ADRE4 Equivalent & Substitute Parts

Part Overview

The ULN2003ADRE4 is a power relay driver IC manufactured by Texas Instruments, designed for driving inductive loads such as relays and solenoids. This 7-channel Darlington array operates with a 1:1 input-to-output ratio and supports a maximum load voltage of 50V with 500mA output current per channel. The device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across critical parameters including output configuration, current rating, voltage specifications, and package form factor.

Key Parameters

Parameter	Value
Manufacturer Part Number	ULN2003ADRE4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Number of Outputs	7
Ratio - Input:Output	1:1
Output Configuration	Low Side
Output Type	Darlington
Interface	Parallel
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Input Type	Inverting
Operating Temperature	-40°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Number of Outputs: 7 channels
Ratio - Input:Output: 1:1
Output Configuration: Low Side
Voltage - Load (Max): 50V
Current - Output (Max): 500mA
Input Type: Inverting
Mounting Type: Surface Mount
Package / Case: 16-SOIC (0.154", 3.90mm Width)

Allowable Variations:

Output Type: Darlington or NPN (both acceptable for relay/solenoid driving applications)
Operating Temperature Range: May exceed the original specification
Manufacturer: Different manufacturers permitted if all electrical parameters match
Product Status: Active parts preferred over obsolete

All substitute parts listed maintain these critical parameters. Variations in operating temperature range and output transistor type (Darlington vs. NPN) do not affect functional compatibility in standard relay driver applications.

Parameter Comparison

Part Number	Manufacturer	Output Type	Voltage - Load (Max)	Current - Output (Max)	Operating Temperature	Package	Product Status
ULN2003ADRE4	Texas Instruments	Darlington	50V	500mA	-40°C ~ 70°C	16-SOIC	Obsolete
ULN2003ADR	Texas Instruments	Darlington	50V	500mA	-40°C ~ 70°C	16-SOIC	Active
ULN2002D1013TR	STMicroelectronics	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2001D1013TR	STMicroelectronics	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2003D1013TR	STMicroelectronics	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2004AS16-13	Diodes Incorporated	NPN	50V	500mA	-40°C ~ 105°C	16-SOIC	Active
ULN2004D1013TR	STMicroelectronics	NPN	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULQ2003ADR2G	onsemi	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULQ2003D1013TR	STMicroelectronics	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULQ2003D1013TRY	STMicroelectronics	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULQ2004D1013TR	STMicroelectronics	Darlington	50V	500mA	-40°C ~ 85°C	16-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: ULN2003ADR

The ULN2003ADR from Texas Instruments is the direct active equivalent to the obsolete ULN2003ADRE4. Both parts share identical electrical specifications, output type (Darlington), and operating temperature range. This part maintains the original manufacturer lineage and is ROHS3 compliant with MSL 1 rating. Inventory availability is substantial (1,005,200 units), ensuring supply chain continuity.

Secondary Recommendations:

ULN2003D1013TR (STMicroelectronics) provides an active Darlington-output alternative with extended operating temperature range (-40°C ~ 85°C) and exceptional inventory depth (1,787,200 units). This part is suitable for applications requiring higher temperature margin.

ULQ2003ADR2G (onsemi) offers Darlington output configuration with active product status and adequate inventory (32,800 units). This part is ROHS3 compliant and suitable for standard relay driver applications.

Alternative Output Type Options:

ULN2002D1013TR, ULN2001D1013TR, ULN2004AS16-13, and ULN2004D1013TR provide NPN output configuration instead of Darlington. These parts maintain all critical electrical parameters (50V, 500mA, 1:1 ratio, low-side configuration) and are suitable for applications where NPN output characteristics are acceptable. All are ROHS3 compliant and active products.

Automotive-Grade Option:

ULQ2003D1013TRY (STMicroelectronics) is qualified to AEC-Q100 automotive standards with Darlington output. This part is suitable for automotive relay driver applications and carries MSL 3 rating.

All recommended substitutes are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use an NPN output part as a substitute for the Darlington ULN2003ADRE4?

A: Yes. Both NPN and Darlington output types are functionally compatible for relay and solenoid driving applications. The primary difference is internal transistor configuration; both achieve the required 50V, 500mA specifications and low-side output configuration. Selection depends on application-specific requirements for saturation voltage and switching characteristics.

Q: What is the difference between ULN2003 and ULQ2003 series parts?

A: Both series maintain identical electrical specifications for relay driving (7 channels, 1:1 ratio, 50V, 500mA). The ULQ2003 series includes automotive-qualified variants (AEC-Q100) with higher operating temperature capability. For non-automotive applications, both series are interchangeable.

Q: Is the 16-SOIC package compatible across all listed substitutes?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package, ensuring pin-for-pin compatibility and identical PCB footprint. No layout modifications are required for substitution.

Q: Why is the operating temperature range different between the original part and some substitutes?

A: The ULN2003ADRE4 specifies -40°C ~ 70°C, while many active substitutes extend to -40°C ~ 85°C or higher. Extended temperature range does not affect compatibility; it indicates improved thermal performance in the substitute design. Parts with extended range are suitable for all applications within the original temperature specification.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original obsolete part.

Q: What is the significance of MSL rating differences?

A: The original part carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Most substitutes also carry MSL 1. The ULQ2003D1013TRY carries MSL 3 (168 Hours), requiring controlled moisture exposure during storage and handling. MSL differences do not affect electrical compatibility but impact storage and assembly procedures.

Q: Which substitute offers the best inventory availability?

A: ULN2003D1013TR (STMicroelectronics) provides the highest inventory depth at 1,787,200 units, followed by ULN2003ADR (Texas Instruments) at 1,005,200 units. Both ensure long-term supply chain security.

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