ULQ2003ADRG4 Equivalent & Substitute Parts

Part Overview

The ULQ2003ADRG4 is a power switch/driver IC manufactured by Texas Instruments, designed for relay and solenoid driving applications. This 7-output Darlington array operates at a maximum load voltage of 50V with 500mA output current per channel in a 16-SOIC surface mount package. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	ULQ2003ADRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Number of Outputs	7
Output Type	Darlington
Voltage - Load (Max)	50V
Current - Output (Max)	500mA
Output Configuration	Low Side
Ratio - Input:Output	1:1
Interface	Parallel
Input Type	Inverting
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ULQ2003ADRG4 is determined by strict equivalence across the following critical parameters:

Output Configuration: Low Side switching only
Number of Outputs: 7 channels
Output Type: Darlington transistor arrays
Voltage Rating: 50V maximum load voltage
Current Rating: 500mA maximum output current
Package: 16-SOIC form factor
Interface: Parallel input control
Input Logic: Inverting configuration
Ratio: 1:1 input-to-output

Substitute parts are grouped into three categories based on manufacturer and product status:

MFR Recommended Substitutes (Texas Instruments): ULQ2003ADR and ULQ2003AQDRQ1 maintain identical electrical specifications with different product lifecycle status.

Direct Equivalents (Cross-Manufacturer): MC1413BDR2G and MC1413DR2G (onsemi), ULN2001D1013TR, ULN2002D1013TR, ULN2003D1013TR, and ULN2004D1013TR (STMicroelectronics) provide functional equivalence with matching electrical parameters.

Upgrade Options: ULQ2003D1013TR and ULQ2003D1013TRY (STMicroelectronics) offer enhanced temperature performance and automotive qualification.

Parameter Comparison

Parameter	ULQ2003ADRG4	ULQ2003ADR	ULQ2003AQDRQ1	MC1413BDR2G	MC1413DR2G	ULN2001D1013TR	ULN2002D1013TR	ULN2003D1013TR	ULN2004D1013TR	ULQ2003D1013TR	ULQ2003D1013TRY
Manufacturer	TI	TI	TI	onsemi	onsemi	STM	STM	STM	STM	STM	STM
Number of Outputs	7	7	7	7	7	7	7	7	7	7	7
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	NPN	NPN	Darlington	NPN	Darlington	Darlington
Voltage - Load (Max)	50V	50V	50V	50V	50V	50V	50V	50V	50V	50V	50V
Current - Output (Max)	500mA	500mA	500mA	500mA	500mA	500mA	500mA	500mA	500mA	500mA	500mA
Output Configuration	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side	Low Side
Ratio - Input:Output	1:1	1:1	1:1	1:1	1:1	1:1	1:1	1:1	1:1	1:1	1:1
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	150°C (TJ)	150°C (TJ)	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	150°C (TJ)	150°C (TJ)
Product Status	Obsolete	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	Yes (AEC-Q100)	No	No	No	No	No	No	No	Yes (AEC-Q100)

Engineering Selection Recommendations

Primary Recommendation: ULQ2003ADR (Texas Instruments) is the direct manufacturer substitute for the obsolete ULQ2003ADRG4. This part maintains identical electrical specifications and packaging while offering Last Time Buy status, providing a defined procurement window for design transitions.

Active Production Alternative: ULQ2003AQDRQ1 (Texas Instruments) is the recommended long-term solution. This part is in Active production status with extended operating temperature range (-40°C to 105°C) and AEC-Q100 automotive qualification, ensuring sustained availability and supply chain stability.

Cross-Manufacturer Options: STMicroelectronics ULN2003D1013TR provides a functionally equivalent Darlington array with Active status and high inventory availability. onsemi MC1413BDR2G and MC1413DR2G are direct functional equivalents with Active status.

Temperature-Sensitive Applications: For designs requiring extended temperature performance beyond -40°C to 85°C, ULQ2003D1013TR and ULQ2003D1013TRY (STMicroelectronics) offer junction temperature ratings to 150°C. ULQ2003D1013TRY includes automotive qualification (AEC-Q100).

NPN Output Consideration: ULN2001D1013TR, ULN2002D1013TR, and ULN2004D1013TR (STMicroelectronics) provide NPN output configuration instead of Darlington. These are functionally equivalent for applications where NPN switching characteristics are acceptable.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and identical 16-SOIC packaging, ensuring direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can ULQ2003ADR directly replace ULQ2003ADRG4 without circuit modification?

A: Yes. ULQ2003ADR is electrically and mechanically identical to ULQ2003ADRG4. Both feature 7 Darlington outputs, 50V maximum load voltage, 500mA per-channel current rating, 1:1 input-output ratio, and 16-SOIC packaging. No circuit changes are required.

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

A: Darlington output types (ULQ2003ADRG4, ULQ2003ADR, MC1413BDR2G, ULN2003D1013TR) provide higher current gain and lower saturation voltage. NPN types (ULN2001D1013TR, ULN2002D1013TR, ULN2004D1013TR) offer faster switching speed. Both achieve 500mA maximum output current and 50V voltage rating. Selection depends on application switching speed requirements.

Q: Why is ULQ2003AQDRQ1 recommended for new designs?

A: ULQ2003AQDRQ1 is in Active production status with extended operating temperature range (-40°C to 105°C) and AEC-Q100 automotive qualification. This ensures long-term availability and supply chain continuity compared to Last Time Buy or Obsolete status parts.

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

A: Yes. All listed substitutes use 16-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring direct PCB footprint compatibility with ULQ2003ADRG4.

Q: What is the difference between ULQ2003D1013TR and ULQ2003D1013TRY?

A: Both are STMicroelectronics Darlington arrays with 150°C junction temperature rating. ULQ2003D1013TRY includes AEC-Q100 automotive qualification and MSL 3 (168 Hours) moisture sensitivity rating, while ULQ2003D1013TR has MSL 1 (Unlimited). Select ULQ2003D1013TRY for automotive applications requiring qualification documentation.

Q: Can I use cross-manufacturer substitutes (onsemi or STMicroelectronics) in production?

A: Yes. MC1413BDR2G and MC1413DR2G (onsemi) and ULN2003D1013TR (STMicroelectronics) are functionally equivalent with Active production status and ROHS3 compliance. Verify manufacturer datasheets for any application-specific timing or thermal characteristics before design release.

Q: What inventory considerations apply to these substitutes?

A: ULQ2003ADR has 130,100 units in stock (Last Time Buy status). ULQ2003AQDRQ1 has 55,100 units (Active). ULN2003D1013TR has the highest inventory at 1,787,200 units. For long-term production, prioritize Active status parts with highest inventory levels.

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