ULQ2003AD Equivalent & Substitute Parts

Part Overview

The ULQ2003AD is a Power Management IC (PMIC) manufactured by Texas Instruments, classified as a Power Switch/Driver with 1:1 Darlington configuration. This 16-SOIC surface mount device provides 7 low-side outputs rated for 50V maximum load voltage and 500mA maximum output current, designed for relay and solenoid driver applications with inverting parallel interface logic.

The ULQ2003AD carries Last Time Buy status, indicating end-of-life production. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this component architecture.

Key Parameters

Parameter	Value
Manufacturer Part Number	ULQ2003AD
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Number of Outputs	7
Output Type	Darlington
Output Configuration	Low Side
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Input Type	Inverting
Interface	Parallel
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the ULQ2003AD is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

Allowable Variations:

Output Type: Darlington or NPN (both acceptable for relay/solenoid driver applications)
Operating Temperature Range: May extend beyond -40°C ~ 85°C
Manufacturer: Texas Instruments, onsemi, or STMicroelectronics
Product Status: Active preferred over Last Time Buy
Packaging Format: Tube, Cut Tape (CT), or Digi-Reel®

Substitute parts are grouped into three categories: MFR Recommended (direct upgrade path), Direct Equivalents (same electrical and mechanical specifications), and Upgrade Options (enhanced temperature or automotive qualification).

Parameter Comparison

Part Number	Manufacturer	Output Type	Number of Outputs	Voltage - Load (Max)	Current - Output (Max)	Package	Operating Temperature	Product Status	RoHS Status
ULQ2003AD	Texas Instruments	Darlington	7	50V	500mA	16-SOIC	-40°C ~ 85°C	Last Time Buy	ROHS3
ULQ2003AQDRQ1	Texas Instruments	Darlington	7	50V	500mA	16-SOIC	-40°C ~ 105°C	Active	ROHS3
MC1413BDR2G	onsemi	Darlington	7	50V	500mA	16-SOIC	150°C (TJ)	Active	ROHS3
MC1413DR2G	onsemi	Darlington	7	50V	500mA	16-SOIC	150°C (TJ)	Active	ROHS3
ULN2001D1013TR	STMicroelectronics	NPN	7	50V	500mA	16-SOIC	-40°C ~ 85°C	Active	ROHS3
ULN2002D1013TR	STMicroelectronics	NPN	7	50V	500mA	16-SOIC	-40°C ~ 85°C	Active	ROHS3
ULN2003D1013TR	STMicroelectronics	Darlington	7	50V	500mA	16-SOIC	-40°C ~ 85°C	Active	ROHS3
ULN2004D1013TR	STMicroelectronics	NPN	7	50V	500mA	16-SOIC	-40°C ~ 85°C	Active	ROHS3
ULQ2003D1013TR	STMicroelectronics	Darlington	7	50V	500mA	16-SOIC	150°C (TJ)	Active	ROHS3
ULQ2003D1013TRY	STMicroelectronics	Darlington	7	50V	500mA	16-SOIC	150°C (TJ)	Active	ROHS3
ULQ2004D1013TR	STMicroelectronics	Darlington	7	50V	500mA	16-SOIC	150°C (TJ)	Active	ROHS3

Engineering Selection Recommendations

MFR Recommended Upgrade: ULQ2003AQDRQ1 (Texas Instruments) is the direct manufacturer-recommended replacement. This part maintains identical electrical specifications and package format while offering extended operating temperature range (-40°C ~ 105°C) and Active product status. This option provides continuity with the original design intent and manufacturer support.

Direct Equivalents - Darlington Output Type: ULN2003D1013TR (STMicroelectronics) provides functional equivalence with identical output type (Darlington), electrical ratings, and operating temperature range. This part carries Active status with high inventory availability (1,787,200 units), ensuring supply chain stability.

Direct Equivalents - NPN Output Type: ULN2001D1013TR, ULN2002D1013TR, and ULN2004D1013TR (STMicroelectronics) are functionally equivalent with NPN output configuration instead of Darlington. These parts maintain all critical electrical and mechanical parameters and carry Active status. Selection between these variants depends on application-specific circuit requirements.

Enhanced Temperature Performance: MC1413BDR2G and MC1413DR2G (onsemi), ULQ2003D1013TR, ULQ2003D1013TRY, and ULQ2004D1013TR (STMicroelectronics) offer extended junction temperature ratings (150°C TJ). These options are suitable for applications requiring higher thermal performance margins. ULQ2003D1013TRY includes AEC-Q100 automotive qualification.

All substitute parts maintain ROHS3 compliance and are available in active production status, ensuring long-term supply availability and design continuity.

Frequently Asked Questions (FAQ)

Q: Can I substitute ULQ2003AD with ULN2003D1013TR? A: Yes. Both parts share identical electrical specifications (7 outputs, 50V load voltage, 500mA output current, 16-SOIC package, inverting parallel interface, low-side configuration). The primary difference is output type: ULQ2003AD uses Darlington configuration while ULN2003D1013TR uses NPN. Both are acceptable for relay and solenoid driver applications. ULN2003D1013TR carries Active status with superior inventory availability.

Q: What is the difference between Darlington and NPN output types? A: Both output types are functionally equivalent for this product category. Darlington configuration provides higher current gain, while NPN offers lower saturation voltage. For relay and solenoid driver applications operating at 500mA maximum output current, both configurations meet the specified electrical requirements.

Q: Can I use MC1413BDR2G or MC1413DR2G as substitutes? A: Yes. These onsemi parts are direct equivalents with identical electrical and mechanical specifications. They are categorized as Transistor Arrays rather than PMICs, but provide equivalent functionality in relay and solenoid driver circuits. Both parts offer extended junction temperature rating (150°C TJ) and Active product status.

Q: Does package format matter when substituting? A: The 16-SOIC package format is mandatory for all substitutes. All listed alternatives use identical 16-SOIC (0.154", 3.90mm Width) packaging, ensuring PCB layout compatibility. Packaging format variations (Tube, Cut Tape, Digi-Reel) do not affect electrical or mechanical compatibility.

Q: Why should I choose ULQ2003AQDRQ1 over other options? A: ULQ2003AQDRQ1 is the manufacturer-recommended upgrade from Texas Instruments, the original ULQ2003AD manufacturer. This part maintains design continuity, offers extended operating temperature range (-40°C ~ 105°C), and carries Active product status. It is the preferred choice when manufacturer continuity is a design requirement.

Q: Are automotive-qualified versions available? A: Yes. ULQ2003D1013TRY (STMicroelectronics) carries AEC-Q100 automotive qualification with 150°C junction temperature rating. This part is suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: What inventory considerations should I evaluate? A: ULN2003D1013TR offers the highest inventory availability (1,787,200 units), providing maximum supply chain security. ULQ2003AQDRQ1 provides 55,100 units. All listed substitutes maintain Active product status, ensuring continued availability for future production runs.

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