ULN2003BN Equivalent & Substitute Parts

Part Overview

The ULN2003BN is a power switch/driver IC manufactured by Texas Instruments, designed for relay and solenoid driving applications. It features seven Darlington output stages with a 1:1 input-to-output ratio, capable of switching loads up to 50V at 500mA per channel. The device is packaged in a 16-pin DIP format suitable for through-hole mounting.

The ULN2003BN carries a Last Time Buy status, indicating that Texas Instruments has discontinued active production. This necessitates identifying functionally equivalent alternatives to ensure design continuity and supply chain reliability for new production runs and long-term support.

Substiute Parts

ULN2003BN

Texas InstrumentsIn Stock: 2675ULN2003BN Datasheet

Current PartRFQ

ULN2003AN

Texas InstrumentsIn Stock: 55198ULN2003AN Datasheet

MFR RecommendedRFQ

TBD62003APG

Toshiba Semiconductor and StorageIn Stock: 63468TBD62003APG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ULN2003BN is determined by the following critical parameters:

• Number of Outputs: Must be 7 channels
• Voltage - Load (Max): Must support minimum 50V
• Current - Output (Max): Must support minimum 500mA per channel
• Ratio - Input:Output: Must maintain 1:1 configuration
• Output Configuration: Must be Low Side
• Input Type: Must be Inverting
• Package / Case: Must be 16-DIP (0.300", 7.62mm)
• Mounting Type: Must be Through Hole

The substitute parts identified below meet all these critical parameters, ensuring direct functional compatibility in existing circuit designs without PCB modifications or signal conditioning changes.

Parameter Comparison

Engineering Selection Recommendations

ULN2003AN (Texas Instruments) is the primary recommended substitute. It maintains identical electrical specifications and packaging to the ULN2003BN, with the exception of a reduced operating temperature maximum of 70°C versus 105°C. This part carries Active product status with 55,100 units in stock, ensuring supply continuity. Both parts are ROHS3 compliant and share the same base product number within the ULx200xA series.

TBD62003APG (Toshiba Semiconductor and Storage) serves as an alternative substitute for applications where the operating temperature range of -40°C to 85°C is acceptable. This part differs in output stage topology (N-Channel versus Darlington) and interface classification (On/Off versus Parallel), though it maintains all critical electrical parameters. The TBD62003APG is Active with 63,444 units in stock and carries ROHS3 compliance. MSL rating is 1 (Unlimited), indicating no moisture sensitivity constraints.

Selection between ULN2003AN and TBD62003APG should be based on operating temperature requirements and any design-specific interface or output stage preferences documented in the original circuit specification.

Frequently Asked Questions (FAQ)

Q: Can ULN2003AN be used as a direct replacement for ULN2003BN without PCB modifications?

A: Yes. Both parts share identical package geometry (16-DIP, 0.300" pitch), pinout configuration, and electrical specifications for voltage, current, and output topology. No PCB layout changes are required.

Q: What is the key difference between ULN2003AN and TBD62003APG?

A: The primary difference is output stage technology. ULN2003AN uses Darlington transistor output stages, while TBD62003APG uses N-Channel output stages. Both achieve the same 50V/500mA switching capability and 1:1 input-to-output ratio. Operating temperature ranges also differ: ULN2003AN supports -40°C to 70°C, while TBD62003APG supports -40°C to 85°C.

Q: Is the ULN2003BN still available for purchase?

A: The ULN2003BN carries Last Time Buy status, indicating production has been discontinued by Texas Instruments. Existing inventory may be available through authorized distributors, but supply is limited. ULN2003AN and TBD62003APG are both Active products with substantial stock levels.

Q: Do all three parts meet RoHS compliance requirements?

A: Yes. ULN2003BN, ULN2003AN, and TBD62003APG are all ROHS3 compliant. All three parts are REACH Unaffected.

Q: Which substitute should I select for new designs?

A: For new designs, ULN2003AN is recommended as the primary choice due to its Active status, identical Darlington output topology to the original ULN2003BN, and superior operating temperature range (70°C maximum). TBD62003APG is suitable if the 85°C maximum operating temperature meets application requirements and N-Channel output characteristics are acceptable.

Q: Are there any moisture sensitivity concerns with these parts?

A: ULN2003BN and ULN2003AN have MSL ratings listed as Not Applicable, indicating no moisture sensitivity constraints. TBD62003APG has an MSL rating of 1 (Unlimited), also indicating no moisture sensitivity constraints. All three parts can be stored and handled under standard conditions without special moisture control measures.