MBR1545CT Equivalent & Substitute Parts

Part Overview

The MBR1545CT is a Schottky diode array in a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 7.5 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in TO-220-3 through-hole format with fast recovery characteristics (≤500 ns). The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Substiute Parts

MBR1545CT

Vishay General Semiconductor - Diodes DivisionIn Stock: 24035MBR1545CT Datasheet

Current PartRFQ

VS-MBR1545CT-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 8527VS-MBR1545CT-M3 Datasheet

Parametric EquivalentRFQ

MBR1545CT

Solid State Inc.In Stock: 23947MBR1545CT Datasheet

DirectRFQ

SBR1545CT

SMC Diode SolutionsIn Stock: 1001SBR1545CT Datasheet

DirectRFQ

MBR1545CTG

onsemiIn Stock: 28286MBR1545CTG Datasheet

UpgradeRFQ

DSSK28-0045A

IXYSIn Stock: 1656DSSK28-0045A Datasheet

MFR RecommendedRFQ

MBR2045CT-BP

Micro Commercial CoIn Stock: 1122MBR2045CT-BP Datasheet

MFR RecommendedRFQ

MBRP1545NTU

Fairchild SemiconductorIn Stock: 1305MBRP1545NTU Datasheet

MFR RecommendedRFQ

STPS1545CT

STMicroelectronicsIn Stock: 1235STPS1545CT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBR1545CT is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Diode Configuration: 1 Pair Common Cathode (electrical pin compatibility)
• Technology: Schottky (switching characteristics and forward voltage behavior)
• Voltage - DC Reverse (Vr) (Max): 45 V (minimum blocking voltage requirement)
• Current - Average Rectified (Io) (per Diode): ≥7.5 A (current handling capacity)
• Mounting Type: Through Hole (mechanical installation compatibility)
• Package / Case: TO-220-3 (physical form factor and pin layout)
• Speed: Fast Recovery ≤500 ns, >200 mA (Io) (switching performance)

Secondary Compatibility Parameters:

• Operating Temperature - Junction range (thermal operating envelope)
• Voltage - Forward (Vf) characteristics (power dissipation considerations)
• Current - Reverse Leakage @ Vr (leakage current behavior)

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

1. Parametric Equivalent – Identical electrical specifications with active product status and improved compliance
2. Direct Manufacturer Equivalent – Same part number from alternative manufacturers or configuration variants
3. Manufacturer Recommended Upgrade – Higher current rating or enhanced specifications while maintaining core compatibility

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

The VS-MBR1545CT-M3 from Vishay General Semiconductor provides parametric equivalence to the obsolete MBR1545CT with identical electrical characteristics (45 V, 7.5 A, 840 mV forward voltage). This part is active and ROHS3 compliant, making it the primary choice for direct substitution. The operating temperature range is reduced to -65°C to 150°C compared to the original -65°C to 175°C specification.

The MBR1545CTG from onsemi maintains full electrical equivalence including the extended junction temperature range (-65°C to 175°C) and achieves ROHS3 compliance. This part is actively manufactured and represents a fully compatible replacement.

Enhanced Performance Alternatives:

The STPS1545CT from STMicroelectronics provides identical current and voltage ratings with superior forward voltage characteristics (570 mV @ 7.5 A versus 840 mV @ 15 A), resulting in reduced power dissipation. This part is ROHS3 compliant and active. The minimum operating temperature is -55°C, which may be a constraint in applications requiring -65°C operation.

Higher Current Capacity Options:

For applications requiring increased current handling, the MBRP1545NTU (Fairchild Semiconductor, 15 A), DSSK28-0045A (IXYS, 15 A), and MBR2045CT-BP (Micro Commercial Co, 20 A) provide higher average rectified current ratings while maintaining 45 V reverse voltage and 1 Pair Common Cathode configuration. These parts are active and suitable for designs with elevated current demands.

Compliance Considerations:

All recommended active substitutes achieve ROHS3 compliance except where compliance status is not specified by the manufacturer. The original MBR1545CT is RoHS non-compliant; migration to compliant alternatives is necessary for new designs subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can the VS-MBR1545CT-M3 be used as a direct replacement for the obsolete MBR1545CT?

A: Yes. The VS-MBR1545CT-M3 provides identical electrical specifications (45 V, 7.5 A, 840 mV forward voltage, 100 µA reverse leakage) and is packaged in TO-220-3. The operating temperature range is -65°C to 150°C versus the original -65°C to 175°C. Applications operating above 150°C junction temperature require evaluation of the MBR1545CTG alternative.

Q: What is the difference between the MBR1545CTG and VS-MBR1545CT-M3?

A: Both parts are manufactured by Vishay and onsemi respectively and provide identical electrical specifications. The MBR1545CTG maintains the full -65°C to 175°C junction temperature range of the original part, while the VS-MBR1545CT-M3 is rated to 150°C maximum. Both are ROHS3 compliant and actively produced.

Q: Why does the STPS1545CT have lower forward voltage than the original MBR1545CT?

A: Forward voltage characteristics vary between manufacturers and manufacturing processes. The STPS1545CT from STMicroelectronics exhibits 570 mV @ 7.5 A compared to 840 mV @ 15 A for the MBR1545CT. This represents improved efficiency and reduced power dissipation in the same current and voltage class. The part is electrically compatible and suitable for direct substitution.

Q: Can I use a higher current rated part such as the MBRP1545NTU (15 A) or MBR2045CT-BP (20 A) as a substitute?

A: Yes. Higher current rated parts maintain the same 45 V reverse voltage, 1 Pair Common Cathode configuration, and TO-220-3 package. These parts are electrically and mechanically compatible. The higher current rating provides design margin and does not create incompatibility with circuits designed for 7.5 A operation.

Q: What is the significance of the "1 Pair Common Cathode" configuration?

A: This configuration indicates two diodes sharing a common cathode connection, resulting in three external pins (two anodes and one common cathode). This pin arrangement is critical for circuit compatibility. Parts with different configurations (such as "2 Independent") have different pin assignments and are not interchangeable despite identical voltage and current ratings.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All recommended substitute parts are packaged in TO-220-3 through-hole format, ensuring mechanical and thermal compatibility with the original MBR1545CT. Mounting footprints and heatsink interfaces remain identical.

Q: Which substitute part should I select for new designs?

A: For new designs, the MBR1545CTG (onsemi) or VS-MBR1545CT-M3 (Vishay) are recommended as primary choices due to active production status, ROHS3 compliance, and full electrical equivalence. The MBR1545CTG is preferred if the full -65°C to 175°C temperature range is required. For applications prioritizing reduced power dissipation, the STPS1545CT (STMicroelectronics) provides superior forward voltage characteristics.

Q: What is the difference between RoHS non-compliant and ROHS3 compliant parts?

A: RoHS compliance indicates adherence to restrictions on hazardous substances in electrical and electronic equipment. The original MBR1545CT is non-compliant; all active substitutes listed are ROHS3 compliant. New designs and production in regulated markets require compliant components.