ULN2003AD Equivalent & Substitute Parts

Part Overview

The ULN2003AD is a 7-channel NPN Darlington power switch/driver manufactured by Texas Instruments, designed for relay and solenoid driving applications. This device 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. The ULN2003AD is classified as Last Time Buy, indicating production discontinuation. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	ULN2003AD
Number of Outputs	7
Output Type	Darlington
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Input Type	Inverting
Output Configuration	Low Side
Package	16-SOIC
Operating Temperature	-40°C ~ 70°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ULN2003AD 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 circuit validation
Voltage - Load (Max): Minimum 50V rating required
Current - Output (Max): Minimum 500mA per channel required
Input Type: Inverting logic required
Output Configuration: Low side switching required
Package: 16-SOIC or 16-SO (mechanically compatible)
Ratio - Input:Output: 1:1 required

Substitute parts are grouped into two categories: direct equivalents (same output type and manufacturer packaging) and functional equivalents (alternative manufacturers or output types meeting all electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Output Type	Package	Voltage - Load (Max)	Current - Output (Max)	Operating Temperature	Product Status
ULN2003AD	Texas Instruments	Darlington	16-SOIC	50V	500mA	-40°C ~ 70°C	Last Time Buy
ULN2003ADR	Texas Instruments	Darlington	16-SOIC	50V	500mA	-40°C ~ 70°C	Active
ULN2003D1013TR	STMicroelectronics	Darlington	16-SO	50V	500mA	-40°C ~ 85°C	Active
ULQ2003ADR2G	onsemi	Darlington	16-SOIC	50V	500mA	-40°C ~ 85°C	Active
ULQ2003D1013TR	STMicroelectronics	Darlington	16-SO	50V	500mA	150°C (TJ)	Active
ULQ2003D1013TRY	STMicroelectronics	Darlington	16-SO	50V	500mA	150°C (TJ)	Active
ULN2002D1013TR	STMicroelectronics	NPN	16-SO	50V	500mA	-40°C ~ 85°C	Active
ULN2001D1013TR	STMicroelectronics	NPN	16-SO	50V	500mA	-40°C ~ 85°C	Active
ULN2004D1013TR	STMicroelectronics	NPN	16-SO	50V	500mA	-40°C ~ 85°C	Active
ULN2004AS16-13	Diodes Incorporated	NPN	16-SO	50V	500mA	-40°C ~ 105°C	Active
ULQ2004D1013TR	STMicroelectronics	Darlington	16-SO	50V	500mA	150°C (TJ)	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended)

ULN2003ADR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications, Darlington output configuration, and 16-SOIC packaging as the ULN2003AD. The only difference is product status transition from Last Time Buy to Active, ensuring continued availability. Both parts are ROHS3 compliant with MSL 1 rating.

Tier 2 - Functional Equivalent (Darlington Output)

ULN2003D1013TR (STMicroelectronics), ULQ2003ADR2G (onsemi), ULQ2003D1013TR (STMicroelectronics), ULQ2003D1013TRY (STMicroelectronics), and ULQ2004D1013TR (STMicroelectronics) meet all electrical requirements with Darlington output configuration. These parts feature extended operating temperature ranges (-40°C to 85°C or 150°C junction temperature) compared to the original -40°C to 70°C specification. Package variants include 16-SO and 16-SOIC, both mechanically compatible with standard 16-pin SOIC footprints. All are ROHS3 compliant.

Tier 3 - Functional Equivalent (NPN Output)

ULN2002D1013TR, ULN2001D1013TR, ULN2004D1013TR (STMicroelectronics), and ULN2004AS16-13 (Diodes Incorporated) provide NPN output configuration instead of Darlington. These parts maintain 50V/500mA electrical specifications and 16-SO packaging. The ULN2004AS16-13 offers the widest operating temperature range (-40°C to 105°C). NPN substitution requires circuit validation to confirm saturation voltage and switching characteristics are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I use ULN2003ADR as a direct replacement for ULN2003AD?

A: Yes. ULN2003ADR is electrically and mechanically identical to ULN2003AD. Both feature Darlington output, 50V/500mA ratings, 16-SOIC packaging, and -40°C to 70°C operating temperature. The primary difference is product status; ULN2003ADR is Active while ULN2003AD is Last Time Buy.

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

A: Darlington output devices (ULN2003, ULQ2003, ULQ2004) feature compound transistor structures with higher current gain and lower saturation voltage. NPN output devices (ULN2001, ULN2002, ULN2004) use single transistor stages. Both configurations meet the 50V/500mA specification, but saturation voltage and switching speed differ. Verify circuit requirements before substituting between output types.

Q: Are 16-SOIC and 16-SO packages interchangeable?

A: 16-SOIC and 16-SO are mechanically compatible on standard PCB footprints. Both are 16-pin surface mount packages with 0.154" (3.90mm) width. Pin pitch and lead spacing are identical, allowing direct footprint compatibility.

Q: Which substitute part offers the best temperature performance?

A: ULQ2003D1013TRY and ULQ2003D1013TR feature 150°C junction temperature rating, the highest in the substitute list. ULN2004AS16-13 (Diodes Incorporated) offers -40°C to 105°C ambient operating range, the widest among standard industrial-grade parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original ULN2003AD.

Q: What is the MSL (Moisture Sensitivity Level) difference between ULQ2003D1013TRY and other parts?

A: ULQ2003D1013TRY carries MSL 3 (168 Hours) rating due to automotive qualification (AEC-Q100), while most other parts are MSL 1 (Unlimited). MSL 3 requires controlled moisture exposure during storage and handling. Standard industrial applications typically use MSL 1 parts.

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