ULN2003ADE4 Equivalent & Substitute Parts

Part Overview

The ULN2003ADE4 is a power relay driver IC manufactured by Texas Instruments, featuring seven NPN Darlington output transistors in a 16-SOIC package. This component is classified as a Power Management (PMIC) device and is designed for driving relays and solenoids with a maximum load voltage of 50V and output current of 500mA per channel. The ULN2003ADE4 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	ULN2003ADE4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Number of Outputs	7
Output Type	Darlington
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Package / Case	16-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 70°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ULN2003ADE4 is determined by the following critical parameters:

Number of Outputs: Must be 7 channels
Output Type: Darlington configuration preferred for direct replacement; NPN alternatives acceptable with application review
Voltage - Load (Max): Minimum 50V rating required
Current - Output (Max): Minimum 500mA per channel required
Package / Case: 16-SOIC form factor for PCB compatibility
Ratio - Input:Output: 1:1 configuration
Output Configuration: Low Side switching
Interface: Parallel input control

Substitute parts are grouped into two categories: manufacturer-recommended direct replacements (same electrical and mechanical specifications) and upgrade alternatives (enhanced features or extended temperature range).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Load (Max)	Current - Output (Max)	Package	Operating Temperature
ULN2003ADE4	Texas Instruments	Obsolete	Darlington	50V	500mA	16-SOIC	-40°C ~ 70°C
ULN2003AD	Texas Instruments	Last Time Buy	Darlington	50V	500mA	16-SOIC	-40°C ~ 70°C
ULN2003ADR	Texas Instruments	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 70°C
MC1413DR2G	onsemi	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 150°C
ULN2001D1013TR	STMicroelectronics	Active	NPN	50V	500mA	16-SOIC	-40°C ~ 85°C
ULN2002D1013TR	STMicroelectronics	Active	NPN	50V	500mA	16-SOIC	-40°C ~ 85°C
ULN2003D1013TR	STMicroelectronics	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 85°C
ULN2004D1013TR	STMicroelectronics	Active	NPN	50V	500mA	16-SOIC	-40°C ~ 85°C
ULQ2003ADR2G	onsemi	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 85°C
ULQ2003D1013TR	STMicroelectronics	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 150°C
ULQ2003D1013TRY	STMicroelectronics	Active	Darlington	50V	500mA	16-SOIC	-40°C ~ 150°C

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred)

ULN2003ADR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications and package configuration as the ULN2003ADE4 while offering active product status with full manufacturing support. All compliance certifications (ROHS3, REACH Unaffected) are equivalent.

Tier 2 - Manufacturer Alternatives (Active Status)

ULN2003D1013TR (STMicroelectronics) provides Darlington output configuration with extended operating temperature range (-40°C to 85°C) and active product status. This part is suitable for applications requiring higher temperature performance than the original specification.

ULQ2003ADR2G (onsemi) and ULQ2003D1013TR (STMicroelectronics) offer extended temperature operation (-40°C to 85°C and -40°C to 150°C respectively) with Darlington output type. ULQ2003D1013TRY includes automotive-grade qualification (AEC-Q100) for applications requiring automotive compliance.

Tier 3 - Cross-Manufacturer Options (NPN Configuration)

ULN2001D1013TR, ULN2002D1013TR, and ULN2004D1013TR (STMicroelectronics) provide NPN output configuration instead of Darlington. These parts maintain 50V/500mA electrical ratings and 16-SOIC packaging but require application-level verification due to different transistor characteristics.

Tier 4 - Alternative Manufacturer (Extended Temperature)

MC1413DR2G (onsemi) delivers Darlington output with extended operating temperature to 150°C and active product status. This option is suitable for high-temperature environments while maintaining full electrical compatibility.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can I use ULN2003ADR as a direct replacement for ULN2003ADE4?

A: Yes. ULN2003ADR is electrically and mechanically identical to ULN2003ADE4, with the primary difference being active product status versus obsolete status. Both parts feature 7 Darlington outputs, 50V maximum load voltage, 500mA output current, and 16-SOIC packaging.

Q: What is the difference between Darlington and NPN output types in this product family?

A: Darlington output transistors provide higher current gain and lower saturation voltage, making them suitable for low-impedance load driving. NPN alternatives (ULN2001, ULN2002, ULN2004 series) offer different switching characteristics and require application-specific evaluation before substitution.

Q: Are the STMicroelectronics ULN2003D1013TR and Texas Instruments ULN2003ADR interchangeable?

A: Both parts meet the core electrical requirements (7 outputs, 50V/500mA, Darlington type, 16-SOIC package). The STMicroelectronics variant offers extended operating temperature (-40°C to 85°C versus -40°C to 70°C). Substitution is valid for applications within the overlapping temperature range.

Q: What does "Last Time Buy" status mean for ULN2003AD?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this part number. While inventory may be available, no new production is planned. For new designs or long-term production, ULN2003ADR (Active status) is the recommended alternative.

Q: Can I use MC1413DR2G or ULQ2003D1013TR in applications requiring operation above 70°C?

A: Yes. Both MC1413DR2G and ULQ2003D1013TR support extended operating temperatures (150°C maximum junction temperature). These parts are suitable for high-temperature applications where the original ULN2003ADE4 specification (-40°C to 70°C) is insufficient.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component for environmental and hazardous substance requirements.

Q: What packaging options are available for ULN2003 series parts?

A: The primary package for direct substitution is 16-SOIC (0.154", 3.90mm width). Packaging variants include Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR), which affect handling and supply format but not electrical or mechanical compatibility on the PCB.

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