MBR40L45CTH Equivalent & Substitute Parts

Part Overview

The MBR40L45CTH is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 20 A per diode. The device is packaged in TO-220-3 through-hole configuration and operates across a junction temperature range of -65°C to 175°C.

This part carries an obsolete product status. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array.

Substiute Parts

MBR40L45CTH

onsemiIn Stock: 1032MBR40L45CTH Datasheet

Current PartRFQ

STPS40L45CT

STMicroelectronicsIn Stock: 17925STPS40L45CT Datasheet

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VX40M45C-M3/P

Vishay General Semiconductor - Diodes DivisionIn Stock: 841VX40M45C-M3/P Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBR40L45CTH is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 45 V
• Current - Average Rectified (Io) (per Diode): 20 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Through Hole
• Package / Case: TO-220-3
• RoHS Status: ROHS3 Compliant

Allowable Parameter Variations:

• Voltage - Forward (Vf) (Max) @ If: Substitute parts may exceed the 500 mV specification of the main part
• Current - Reverse Leakage @ Vr: Substitute parts may differ from the 1.2 mA specification
• Operating Temperature - Junction (Maximum): Substitute parts may have lower maximum junction temperature ratings
• Product Status: Active substitute parts are acceptable for obsolete main parts

The identified substitute parts STPS40L45CT and VX40M45C-M3/P satisfy all mandatory matching parameters and are therefore electrically and mechanically compatible with the MBR40L45CTH.

Parameter Comparison

Engineering Selection Recommendations

STPS40L45CT (STMicroelectronics): This substitute part is active in production and maintains full electrical and mechanical compatibility with the MBR40L45CTH. The forward voltage specification is 30 mV higher at 530 mV versus 500 mV, and reverse leakage is lower at 600 µA. The maximum junction temperature is 150°C, which is 25°C lower than the main part. This part is ROHS3 compliant and carries MSL 1 rating, indicating unlimited moisture sensitivity protection. Selection of this part is appropriate for applications where supply continuity and active manufacturer support are required.

VX40M45C-M3/P (Vishay General Semiconductor - Diodes Division): This substitute part is active in production and maintains full electrical and mechanical compatibility with the MBR40L45CTH. The forward voltage specification is 100 mV higher at 600 mV, and reverse leakage is significantly lower at 250 µA. The maximum junction temperature matches the main part at 175°C. This part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. Selection of this part is appropriate for applications requiring automotive-qualified components or extended temperature performance matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can STPS40L45CT be used as a direct replacement for MBR40L45CTH?

A: Yes. Both parts share identical diode configuration (1 pair common cathode), Schottky technology, 45 V reverse voltage rating, 20 A average rectified current per diode, fast recovery speed characteristics, through-hole mounting, and TO-220-3 package. Both are ROHS3 compliant. The STPS40L45CT is an active product, whereas the MBR40L45CTH is obsolete.

Q: Can VX40M45C-M3/P be used as a direct replacement for MBR40L45CTH?

A: Yes. Both parts share identical diode configuration (1 pair common cathode), Schottky technology, 45 V reverse voltage rating, 20 A average rectified current per diode, fast recovery speed characteristics, through-hole mounting, and TO-220-3 package. Both are ROHS3 compliant. The VX40M45C-M3/P is an active product with automotive qualification, whereas the MBR40L45CTH is obsolete.

Q: What is the significance of the forward voltage differences between these parts?

A: The MBR40L45CTH specifies 500 mV maximum forward voltage at 20 A. The STPS40L45CT specifies 530 mV, and the VX40M45C-M3/P specifies 600 mV. These are maximum ratings. Forward voltage variations within these specifications are acceptable for Schottky diode applications and do not prevent functional substitution. Circuit designs must account for the specified maximum values.

Q: Why does the STPS40L45CT have a lower maximum junction temperature than the MBR40L45CTH?

A: The STPS40L45CT specifies a maximum junction temperature of 150°C, while the MBR40L45CTH specifies 175°C. This is a characteristic difference between the two devices. For applications requiring sustained operation above 150°C, the VX40M45C-M3/P, which matches the 175°C specification, is the appropriate selection.

Q: What does AEC-Q101 qualification mean for the VX40M45C-M3/P?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. The VX40M45C-M3/P carries this qualification, indicating it meets automotive reliability and quality requirements. This qualification is relevant for applications in automotive or similarly demanding environments.

Q: Are all three parts ROHS3 compliant?

A: Yes. The MBR40L45CTH, STPS40L45CT, and VX40M45C-M3/P are all ROHS3 compliant, confirming compliance with restrictions on hazardous substances in electrical and electronic equipment.

Q: What is the difference between TO-220 and TO-220-3 packaging?

A: TO-220-3 refers to the three-lead through-hole package configuration used for these diode arrays. All three parts use this identical package type, ensuring mechanical and thermal compatibility in PCB layouts and heat sink mounting applications.