MBR2040CT Equivalent & Substitute Parts

Part Overview

The MBR2040CT is a Schottky diode array manufactured by Diodes Incorporated, configured as a 1 Pair Common Cathode arrangement in a TO-220-3 through-hole package. This component is rated for 40 V DC reverse voltage with 20 A average rectified current per diode and operates across a junction temperature range of -55°C to 150°C. The part is currently Active in product status and maintains ROHS3 compliance with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when design requirements permit tolerance of specified electrical parameter variations while maintaining functional compatibility within the same package category and diode configuration.

Substiute Parts

MBR2040CT

Diodes IncorporatedIn Stock: 1542MBR2040CT Datasheet

Current PartRFQ

20CTQ040

SMC Diode SolutionsIn Stock: 1037920CTQ040 Datasheet

MFR RecommendedRFQ

STPS2045CT

STMicroelectronicsIn Stock: 25174STPS2045CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MBR2040CT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode (mandatory match)
• Technology: Schottky (mandatory match)
• Mounting Type: Through Hole (mandatory match)
• Package / Case: TO-220-3 (mandatory match)

Electrical Parameter Tolerance:

• Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 40 V
• Current - Average Rectified (Io) (per Diode): Substitute must equal or exceed 20 A
• Operating Temperature - Junction: Substitute must support the required operating range

Compliance Requirements:

• RoHS Status: ROHS3 Compliant (mandatory match)
• Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts identified in this reference meet all mandatory criteria while permitting specified variations in forward voltage, reverse leakage current, and maximum junction temperature within acceptable engineering tolerances for this component category.

Parameter Comparison

Engineering Selection Recommendations

20CTQ040 (SMC Diode Solutions)

The 20CTQ040 provides direct electrical equivalence to the MBR2040CT with identical voltage and current ratings (40 V, 20 A). This substitute demonstrates improved forward voltage performance (800 mV versus 840 mV at 20 A), resulting in lower power dissipation. Both parts maintain identical operating temperature ranges (-55°C to 150°C) and ROHS3 compliance. The 20CTQ040 is packaged in TO-220AB configuration within the TO-220-3 family. Reverse leakage current is specified at 1 mA at 40 V, compared to 100 µA for the MBR2040CT. This substitute is suitable for applications where the MBR2040CT is unavailable and forward voltage optimization is beneficial.

STPS2045CT (STMicroelectronics)

The STPS2045CT operates at a higher reverse voltage rating (45 V versus 40 V) but with reduced average rectified current (10 A versus 20 A per diode). This substitute is not electrically equivalent for applications requiring the full 20 A current rating. The STPS2045CT exhibits superior forward voltage characteristics (570 mV at 10 A) and supports an extended maximum junction temperature of 175°C. This part is suitable only for circuit designs where current requirements do not exceed 10 A per diode and where the higher voltage rating provides system margin. ROHS3 compliance and Active product status are maintained.

Frequently Asked Questions (FAQ)

Q: Can the 20CTQ040 be used as a direct replacement for the MBR2040CT?

A: Yes. The 20CTQ040 maintains identical voltage (40 V), current (20 A), and temperature range specifications (-55°C to 150°C). Both parts use Schottky technology in 1 Pair Common Cathode configuration within TO-220-3 packages. The 20CTQ040 exhibits lower forward voltage (800 mV versus 840 mV at 20 A), which reduces power dissipation. Both parts are ROHS3 compliant and Active in product status.

Q: Is the STPS2045CT a suitable substitute for the MBR2040CT?

A: The STPS2045CT is not suitable for applications requiring 20 A per diode operation. This substitute is rated for 10 A average rectified current, which is 50% of the MBR2040CT specification. The STPS2045CT is appropriate only for circuit designs where current requirements do not exceed 10 A per diode. The higher reverse voltage rating (45 V) does not compensate for the reduced current capacity.

Q: What are the key differences between the MBR2040CT and 20CTQ040?

A: The primary differences are forward voltage (840 mV versus 800 mV at 20 A) and reverse leakage current (100 µA versus 1 mA at 40 V). All other electrical parameters, temperature ranges, and package specifications are identical. The 20CTQ040 is supplied in TO-220AB packaging within the TO-220-3 family.

Q: Are all three parts ROHS3 compliant?

A: Yes. The MBR2040CT, 20CTQ040, and STPS2045CT are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the significance of the TO-220-3 package specification?

A: The TO-220-3 package is a through-hole mounting configuration with three leads. All three parts in this reference use this package type, ensuring mechanical and thermal compatibility in PCB designs. The 20CTQ040 is supplied in TO-220AB variant, which is within the TO-220-3 family specification.

Q: Can forward voltage differences affect circuit performance?

A: Yes. Forward voltage directly impacts power dissipation and voltage drop across the diode. The 20CTQ040 exhibits 40 mV lower forward voltage (800 mV versus 840 mV at 20 A) compared to the MBR2040CT, resulting in reduced heat generation. The STPS2045CT shows significantly lower forward voltage (570 mV at 10 A), but this specification applies only at 10 A operation, not at the MBR2040CT's 20 A rating.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This configuration contains two diodes with a shared cathode terminal. The common cathode connection is the third lead in the TO-220-3 package. All three parts in this reference use identical 1 Pair Common Cathode configuration, ensuring functional compatibility in circuits designed for this topology.