MBR745 Equivalent & Substitute Parts

Part Overview

The MBR745 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for high-speed switching applications requiring 45 V reverse voltage rating and 7.5 A average rectified current capacity. The device is packaged in a TO-220-2 through-hole configuration and is classified as an active product with full RoHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when application requirements necessitate alternative specifications within compatible electrical and mechanical parameters.

Substiute Parts

MBR745

Taiwan Semiconductor CorporationIn Stock: 35551MBR745 Datasheet

Current PartRFQ

MBR745

Taiwan Semiconductor CorporationIn Stock: 35551MBR745 Datasheet

DirectRFQ

STPS1545D

STMicroelectronicsIn Stock: 35289STPS1545D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBR745 is determined by strict equivalence of the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 45 V
• Mounting Type: Through Hole
• Package / Case: TO-220-2
• Technology: Schottky
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitute parts with equal or higher current rating are functionally compatible
• Current - Reverse Leakage @ Vr: Substitute parts with equal or lower leakage current are acceptable
• Operating Temperature - Junction (Max): Substitute parts with equal or higher maximum junction temperature are acceptable
• RoHS and REACH Compliance: Substitute parts must maintain equivalent or superior compliance status

The STPS1545D from STMicroelectronics qualifies as a substitute based on matching voltage rating, package type, mounting configuration, and technology classification. The higher current rating (15 A versus 7.5 A) and higher maximum junction temperature (175°C versus 150°C) represent performance enhancements that do not compromise compatibility in applications designed for the MBR745.

Parameter Comparison

Engineering Selection Recommendations

MBR745 (Primary Selection)

The MBR745 is the original specified component and remains the preferred selection when available. Active product status, full RoHS3 compliance, and REACH unaffected classification confirm regulatory alignment. Inventory availability of 35,502 pieces supports immediate procurement. This part is suitable for applications requiring exactly 7.5 A average rectified current at 45 V reverse voltage with standard thermal performance to 150°C junction temperature.

STPS1545D (Substitute Selection)

The STPS1545D from STMicroelectronics is a qualified substitute when MBR745 availability is constrained. Electrical compatibility is confirmed through matched voltage rating, package configuration, and Schottky technology. The higher current rating (15 A) and elevated maximum junction temperature (175°C) provide performance margin in thermal-constrained applications. RoHS3 compliance and MSL 1 classification maintain regulatory equivalence. Inventory availability of 35,200 pieces supports procurement. The STPS1545D is suitable for direct replacement in existing MBR745 circuit designs without modification to PCB layout or thermal management.

Frequently Asked Questions (FAQ)

Q: Can the STPS1545D replace the MBR745 in existing circuit designs?

A: Yes. The STPS1545D is electrically and mechanically compatible with the MBR745. Both devices share identical 45 V reverse voltage rating, TO-220-2 package configuration, and Schottky fast-recovery technology. The higher current rating and maximum junction temperature of the STPS1545D do not create incompatibility; they represent performance enhancements. No PCB layout modifications are required.

Q: What is the significance of the current rating difference between MBR745 (7.5 A) and STPS1545D (15 A)?

A: The STPS1545D current rating of 15 A exceeds the MBR745 specification of 7.5 A. In applications designed for 7.5 A operation, the STPS1545D operates at reduced stress levels, improving reliability and thermal performance. The substitute part does not impose current limitations on the original design; it accommodates the specified current requirement with additional capacity.

Q: Are there thermal performance differences between these parts?

A: The STPS1545D maximum junction temperature rating is 175°C, compared to 150°C for the MBR745. This 25°C difference provides additional thermal margin in applications operating near the upper temperature limit. Both parts maintain identical operating temperature range at the lower bound (-55°C). The STPS1545D is suitable for applications with elevated ambient or junction temperature conditions.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the MBR745 and STPS1545D are RoHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity level). Regulatory and environmental compliance is equivalent between the two parts. Both are suitable for applications requiring RoHS3 certification.

Q: What is the reverse leakage current difference, and does it affect substitution?

A: The MBR745 specifies 100 µA reverse leakage at 45 V, while the STPS1545D specifies 200 µA at the same voltage. The STPS1545D exhibits higher leakage current. In applications where leakage current is a critical design parameter, this difference must be evaluated against circuit requirements. For most rectifier applications, this difference is not functionally significant.

Q: Are both parts available in the same packaging format?

A: Yes. Both the MBR745 and STPS1545D use TO-220-2 package configuration with through-hole mounting. Pin assignment and PCB footprint are identical. No design modifications are required for mechanical or electrical interconnection.

Q: What is the fast-recovery speed specification, and is it identical between parts?

A: Both parts are specified as fast-recovery diodes with recovery time ≤ 500 ns for currents > 200 mA (Io). This specification is identical and confirms equivalent switching performance in high-frequency rectification applications.