ULQ2003ADR Equivalent & Substitute Parts

Part Overview

The ULQ2003ADR is a power switch/driver IC manufactured by Texas Instruments, designed for relay and solenoid driving applications. This 7-output Darlington array operates at 50V maximum load voltage with 500mA output current per channel in a 16-SOIC surface mount package. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	ULQ2003ADR
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
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 ULQ2003ADR is determined by the following critical parameters:

Output Configuration: Low side switching only
Number of Outputs: 7 channels
Output Type: Darlington or NPN transistor array
Voltage Rating: 50V maximum load voltage
Current Rating: 500mA maximum output current
Package: 16-SOIC surface mount form factor
Input Logic: Inverting configuration
Interface: Parallel input control

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

Manufacturer Recommended (MFR Recommended): ULQ2003AQDRQ1 from Texas Instruments provides direct functional equivalence with extended automotive temperature range (-40°C to 105°C) and AEC-Q100 qualification.

Direct Equivalents (Direct Manufacturer): Parts from onsemi (MC1413BDR2G), STMicroelectronics (ULN2001D1013TR, ULN2002D1013TR, ULN2003D1013TR, ULN2004D1013TR), and Diodes Incorporated (ULN2004AS16-13) meet all electrical and mechanical specifications. These parts maintain the same output configuration, current/voltage ratings, and package footprint.

Upgrade Options (Upgrade): STMicroelectronics ULQ2003D1013TR, ULQ2003D1013TRY, and ULQ2004D1013TR offer enhanced operating temperature performance (up to 150°C junction temperature) and automotive-grade qualification options.

Parameter Comparison

Part Number	Manufacturer	Output Type	Number of Outputs	Voltage - Load (Max)	Current - Output (Max)	Operating Temperature	Package	Product Status
ULQ2003ADR	Texas Instruments	Darlington	7	50V	500mA	-40°C ~ 85°C	16-SOIC	Last Time Buy
ULQ2003AQDRQ1	Texas Instruments	Darlington	7	50V	500mA	-40°C ~ 105°C	16-SOIC	Active
MC1413BDR2G	onsemi	Darlington	7	50V	500mA	-40°C ~ 150°C (TJ)	16-SOIC	Active
ULN2001D1013TR	STMicroelectronics	NPN	7	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2002D1013TR	STMicroelectronics	NPN	7	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2003D1013TR	STMicroelectronics	Darlington	7	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULN2004AS16-13	Diodes Incorporated	NPN	7	50V	500mA	-40°C ~ 105°C	16-SOIC	Active
ULN2004D1013TR	STMicroelectronics	NPN	7	50V	500mA	-40°C ~ 85°C	16-SOIC	Active
ULQ2003D1013TR	STMicroelectronics	Darlington	7	50V	500mA	-40°C ~ 150°C (TJ)	16-SOIC	Active
ULQ2003D1013TRY	STMicroelectronics	Darlington	7	50V	500mA	-40°C ~ 150°C (TJ)	16-SOIC	Active
ULQ2004D1013TR	STMicroelectronics	Darlington	7	50V	500mA	-40°C ~ 150°C (TJ)	16-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement: ULQ2003AQDRQ1 from Texas Instruments is the primary recommended substitute. It maintains identical electrical specifications and package footprint while offering extended temperature range and active product status. This part is suitable for applications requiring Texas Instruments sourcing continuity.

For Active Production with Extended Temperature Range: MC1413BDR2G (onsemi) and ULQ2003D1013TR (STMicroelectronics) provide superior thermal performance with 150°C junction temperature rating. These parts are recommended for applications operating in elevated ambient conditions or requiring long-term reliability margins.

For Automotive Applications: ULQ2003D1013TRY from STMicroelectronics includes AEC-Q100 qualification and automotive-grade certification, suitable for automotive relay and solenoid driver applications.

For NPN Output Requirement: ULN2001D1013TR, ULN2002D1013TR, ULN2003D1013TR, ULN2004D1013TR (STMicroelectronics), and ULN2004AS16-13 (Diodes Incorporated) provide NPN output configuration while maintaining all other electrical and mechanical specifications. These parts are functionally equivalent for applications where NPN output is acceptable.

All substitute parts maintain ROHS3 compliance and identical 16-SOIC package geometry, ensuring direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can ULN2003D1013TR replace ULQ2003ADR directly?

A: Yes. ULN2003D1013TR from STMicroelectronics is functionally equivalent with identical electrical ratings (50V, 500mA, 7 outputs, low-side configuration) and 16-SOIC package. The primary difference is output type (NPN vs. Darlington), which is acceptable for most relay and solenoid driving applications. Verify circuit design compatibility with NPN output characteristics.

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

A: Both output types provide low-side switching for relay and solenoid drivers. Darlington outputs (ULQ2003ADR, MC1413BDR2G, ULQ2003D1013TR) offer higher current gain and lower saturation voltage. NPN outputs (ULN2001D1013TR, ULN2002D1013TR, ULN2003D1013TR, ULN2004D1013TR) provide faster switching speed. Selection depends on application requirements for switching speed versus saturation voltage performance.

Q: Is the 16-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin configuration and PCB footprint. Direct board-level substitution is possible without layout modifications.

Q: Why does ULQ2003AQDRQ1 have a higher operating temperature range than ULQ2003ADR?

A: ULQ2003AQDRQ1 extends the ambient operating temperature range to -40°C ~ 105°C (versus -40°C ~ 85°C for ULQ2003ADR). This provides additional thermal margin for applications in elevated ambient environments. Both parts maintain identical electrical performance within their respective operating ranges.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements.

Q: What is the inventory status for substitute parts?

A: ULN2003D1013TR from STMicroelectronics has the highest inventory availability (1,787,200 pcs). MC1413BDR2G (onsemi) and ULQ2003D1013TRY (STMicroelectronics) also maintain substantial stock levels (150,300 pcs and 106,770 pcs respectively), supporting high-volume production requirements.

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