ULN2004APG Equivalent & Substitute Parts

Part Overview

The ULN2004APG is a Bipolar (BJT) Transistor Array featuring 7 NPN Darlington transistors manufactured by Toshiba Semiconductor and Storage. This component is designed for power relay and solenoid driver applications, providing 1:1 input-to-output configuration with a maximum collector current of 500mA and collector-emitter breakdown voltage of 50V. The device is packaged in a 16-DIP through-hole format suitable for PCB integration.

The ULN2004APG is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for legacy systems or new designs requiring compatible functionality.

Key Parameters

Parameter	Value	Unit
Transistor Type	7 NPN Darlington	—
Current - Collector (Ic) (Max)	500	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max) @ Ib, Ic	1.6V @ 500µA, 350mA	—
Current - Collector Cutoff (Max)	50	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	1000 @ 350mA, 2V	—
Power - Max	1.47	W
Operating Temperature	-40 to 85	°C (TA)
Mounting Type	Through Hole	—
Package / Case	16-DIP (0.300", 7.62mm)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ULN2004APG is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor configuration: 7 NPN Darlington output stages
Maximum collector current: 500mA
Maximum collector-emitter breakdown voltage: 50V
Input-to-output ratio: 1:1
Operating temperature range: -40°C to 85°C minimum

Mechanical Compatibility Requirements:

Mounting type: Through Hole
Package format: 16-DIP (0.300", 7.62mm)
Pin count and spacing: 16 pins

Functional Compatibility Requirements:

Output configuration: Low Side
Input type: Inverting
Application: Relay and solenoid driver

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Substitutes: Parts that maintain identical electrical specifications, package format, and functional characteristics. These include ULN2004A (STMicroelectronics), ULN2002A (STMicroelectronics), and ULN2001A (STMicroelectronics).

Similar Substitutes: Parts that meet core electrical and mechanical requirements but may originate from different manufacturers or have minor specification variations. These include ULQ2004AN (Texas Instruments) and ULQ2001A (STMicroelectronics).

Alternative Substitutes: Parts that provide equivalent functionality through different output configurations or package types. These include TBD62004APG (Toshiba, N-Channel power switch) and ULN2003A (UMW, surface mount variant).

Parameter Comparison

Parameter	ULN2004APG (Main)	ULN2004A	ULN2002A	ULN2001A	ULQ2004AN	ULQ2001A	TBD62004APG	ULN2003A
Manufacturer	Toshiba	STMicroelectronics	STMicroelectronics	STMicroelectronics	Texas Instruments	STMicroelectronics	Toshiba	UMW
Number of Outputs	7	7	7	7	7	7	7	7
Ratio - Input:Output	1:1	1:1	1:1	1:1	1:1	1:1	1:1	1:1
Output Configuration	Low Side	Low Side	Low Side	Low Side	Low Side	—	Low Side	—
Output Type	NPN Darlington	NPN	NPN	NPN	NPN	NPN Darlington	N-Channel	Darlington
Voltage - Load (Max)	50V	50V	50V	50V	50V	50V	50V	50V
Current - Output (Max)	500mA	500mA	500mA	500mA	500mA	500mA	500mA	500mA
Input Type	Inverting	Inverting	Inverting	Inverting	Inverting	—	Inverting	Inverting
Operating Temperature (TA)	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	150°C (TJ)	-40 to 85°C	-40 to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	16-DIP	16-DIP	16-DIP	16-DIP	16-PDIP	16-DIP	16-DIP	16-SOIC
Product Status	Obsolete	Active	Active	Active	Last Time Buy	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Vendor Undefined	—
Inventory Status	754 Pcs	35400 Pcs	2280 Pcs	22700 Pcs	3415 Pcs	2100 Pcs	12100 Pcs	39100 Pcs

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

ULN2004A (STMicroelectronics) and ULN2002A (STMicroelectronics) are direct substitutes for the ULN2004APG. Both parts maintain identical electrical specifications, 16-DIP through-hole packaging, and functional characteristics. Both are classified as Active products with ROHS3 compliance and REACH Unaffected status, ensuring regulatory compliance for new designs and production continuity. ULN2004A offers the highest inventory availability at 35,400 pieces.

ULN2001A (STMicroelectronics) is functionally equivalent with identical electrical parameters and packaging. This part is classified as Active with ROHS3 compliance and maintains 22,700 pieces in inventory.

Secondary Substitutes (Functional Equivalence with Considerations):

ULQ2004AN (Texas Instruments) provides equivalent electrical performance in 16-PDIP packaging. This part is classified as Last Time Buy, indicating limited future availability. It maintains ROHS3 compliance and REACH Unaffected status.

ULQ2001A (STMicroelectronics) is an Active product offering equivalent electrical specifications with 2,100 pieces in inventory. This part is classified as a Transistor (BJT) rather than Power Management (PMIC) but maintains identical functional characteristics.

Alternative Substitutes (Different Package or Configuration):

TBD62004APG (Toshiba) provides equivalent functionality through N-Channel power switch configuration rather than NPN Darlington output. This part maintains 50V maximum load voltage and 500mA output current specifications. It is classified as Active with ROHS3 compliance. This substitute is suitable for applications where N-Channel switching characteristics are acceptable.

ULN2003A (UMW) offers equivalent electrical specifications but in 16-SOIC surface-mount packaging rather than through-hole DIP format. This part is classified as Active with ROHS3 compliance and offers the highest inventory availability at 39,100 pieces. Selection of this part requires PCB redesign to accommodate surface-mount footprint.

Regulatory and Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance. STMicroelectronics and Texas Instruments parts carry REACH Unaffected status, confirming compliance with European chemical regulations. TBD62004APG carries Vendor Undefined REACH status, requiring verification before use in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can ULN2004A directly replace ULN2004APG without circuit modification?

A: Yes. ULN2004A (STMicroelectronics) is a direct substitute maintaining identical electrical specifications, 16-DIP through-hole packaging, 7 NPN Darlington output configuration, 500mA maximum collector current, and 50V maximum collector-emitter breakdown voltage. No circuit modification is required.

Q: What is the difference between ULN2004A and ULQ2004AN?

A: Both parts provide equivalent electrical performance with 7 outputs, 1:1 input-to-output ratio, 500mA maximum current, and 50V maximum voltage. The primary difference is packaging: ULN2004A uses 16-DIP format while ULQ2004AN uses 16-PDIP format. Both are through-hole packages with identical pin spacing (0.300", 7.62mm). ULN2004A is classified as Active while ULQ2004AN is Last Time Buy.

Q: Is TBD62004APG suitable as a substitute for relay driver applications?

A: TBD62004APG provides equivalent electrical specifications for relay and solenoid driver applications with 7 outputs, 500mA maximum current, and 50V maximum load voltage. However, this part uses N-Channel power switch configuration rather than NPN Darlington output. Applications requiring specific Darlington characteristics should use ULN2004A, ULN2002A, or ULN2001A instead.

Q: Why is ULN2003A listed as an alternative substitute if it uses surface-mount packaging?

A: ULN2003A (UMW) maintains equivalent electrical specifications and functional characteristics but requires surface-mount PCB footprint (16-SOIC) rather than through-hole DIP format. This part is suitable only for new designs or PCB revisions that accommodate surface-mount technology. Existing through-hole designs cannot use this substitute without board redesign.

Q: What is the significance of "Last Time Buy" status for ULQ2004AN?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for ULQ2004AN and will not accept new orders after a specified date. While current inventory of 3,415 pieces is available, this part should not be selected for new long-term production designs. ULN2004A or ULN2002A are recommended for designs requiring extended component availability.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The main part ULN2004APG does not specify RoHS status due to its obsolete classification. All active and last-time-buy substitutes meet current RoHS3 requirements for lead-free manufacturing.

Q: Can ULQ2001A be used interchangeably with ULN2004APG?

A: Yes. ULQ2001A (STMicroelectronics) maintains identical electrical specifications including 7 NPN Darlington outputs, 500mA maximum collector current, 50V maximum collector-emitter breakdown voltage, and 16-DIP through-hole packaging. This part is classified as Active with 2,100 pieces in inventory and ROHS3 compliance.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Number of outputs: 7 stages required; (2) Output type: NPN Darlington or equivalent switching configuration; (3) Maximum collector current: 500mA; (4) Maximum collector-emitter breakdown voltage: 50V; (5) Input-to-output ratio: 1:1; (6) Operating temperature range: -40°C to 85°C minimum; (7) Mounting type: Through Hole for direct substitution; (8) Package format: 16-DIP (0.300", 7.62mm) for pin-compatible substitution.

Q: Is operating temperature range a critical substitution parameter?

A: Yes. The ULN2004APG specifies -40°C to 85°C (TA) operating range. All recommended direct substitutes maintain this identical range. ULQ2001A and ULQ2003A specify 150°C (TJ) junction temperature, which represents a different measurement parameter but does not affect substitution compatibility for applications within the -40°C to 85°C ambient range.

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