MB3045S-E3/4W Equivalent & Substitute Parts

Part Overview

The MB3045S-E3/4W is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 30 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating available product status and packaging options.

Substiute Parts

MB3045S-E3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 1047MB3045S-E3/4W Datasheet

Current PartRFQ

VBT3045BP-M3/4W

Vishay General Semiconductor - Diodes DivisionIn Stock: 835VBT3045BP-M3/4W Datasheet

MFR RecommendedRFQ

STPS745G-TR

STMicroelectronicsIn Stock: 16137STPS745G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MB3045S-E3/4W is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V minimum
• Current - Average Rectified (Io): 30 A minimum
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Mounting Type: Surface Mount
• Technology: Schottky
• RoHS Status: ROHS3 Compliant

Substitute Classification:

Direct Equivalent (Full Parameter Match): VBT3045BP-M3/4W meets all primary electrical and mechanical requirements with identical voltage, current, and package specifications. This part is manufactured by Vishay General Semiconductor - Diodes Division and carries active product status.

Partial Substitute (Voltage/Package Compatible, Current Derating Required): STPS745G-TR maintains the 45 V reverse voltage rating and D2PAK package compatibility but is rated for 7.5 A average rectified current, representing a 75% current derating relative to the original specification. This part is manufactured by STMicroelectronics and carries active product status.

Parameter Comparison

Engineering Selection Recommendations

VBT3045BP-M3/4W (Recommended Primary Substitute): This part is the preferred substitute for the obsolete MB3045S-E3/4W. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 45 V reverse voltage, 30 A average rectified current, 700 mV forward voltage at 30 A, and fast recovery switching characteristics. The VBT3045BP-M3/4W carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with MSL 1 rating. The primary difference is the operating temperature range: the original part operates from -65°C to 150°C, while the substitute operates from -40°C to 150°C. This difference is acceptable for applications not requiring sub-zero ambient operation. Packaging is supplied in tube format.

STPS745G-TR (Alternative Substitute for Current-Derating Applications): This part is suitable only for applications where the 30 A current requirement can be reduced to 7.5 A or lower. The STPS745G-TR maintains the 45 V reverse voltage rating and D2PAK package compatibility, ensuring mechanical and thermal interface compatibility. This part is manufactured by STMicroelectronics and carries active product status with high inventory availability (16100 units). All regulatory compliance requirements are met: ROHS3 compliant with MSL 1 rating. The forward voltage specification differs at 840 mV @ 15 A compared to 700 mV @ 30 A for the original part. Selection of this part requires circuit redesign to accommodate the reduced current rating and should be limited to applications with inherently lower current demands.

Frequently Asked Questions (FAQ)

Q: Can VBT3045BP-M3/4W be used as a direct replacement for MB3045S-E3/4W?

A: Yes. The VBT3045BP-M3/4W is a direct electrical and mechanical equivalent. Both parts share identical voltage ratings (45 V), current ratings (30 A), forward voltage characteristics (700 mV @ 30 A), package type (TO-263AB D2PAK), and switching speed (fast recovery ≤ 500ns). The operating temperature range differs slightly (-40°C to 150°C versus -65°C to 150°C), which is acceptable for most applications. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between the MB3045S-E3/4W and STPS745G-TR?

A: The primary difference is current rating. The MB3045S-E3/4W is rated for 30 A average rectified current, while the STPS745G-TR is rated for 7.5 A. Both maintain the same 45 V reverse voltage rating and D2PAK package. The STPS745G-TR is suitable only for applications where current requirements do not exceed 7.5 A. Forward voltage also differs: 700 mV @ 30 A for the original versus 840 mV @ 15 A for the STPS745G-TR.

Q: Are all substitute parts available in the same package?

A: Yes. All three parts—MB3045S-E3/4W, VBT3045BP-M3/4W, and STPS745G-TR—use the TO-263-3 D2PAK (2 Leads + Tab) surface mount package. Packaging format differs: the original and VBT3045BP-M3/4W are supplied in tube format, while STPS745G-TR is supplied in tape and reel format. This does not affect electrical or thermal performance.

Q: Why is the MB3045S-E3/4W obsolete?

A: The MB3045S-E3/4W is classified as obsolete by the manufacturer. The VBT3045BP-M3/4W is the active replacement part from Vishay General Semiconductor - Diodes Division, offering identical electrical specifications and continued product support.

Q: What is the reverse leakage current difference between the original and substitute parts?

A: The MB3045S-E3/4W specifies 200 µA @ 45 V reverse leakage. The VBT3045BP-M3/4W specifies 2 mA @ 45 V, representing a 10-fold increase. The STPS745G-TR specifies 100 µA @ 45 V. For applications sensitive to reverse leakage current, the STPS745G-TR offers lower leakage than the VBT3045BP-M3/4W, though both are acceptable for most rectifier applications.

Q: Are all parts RoHS compliant?

A: Yes. All three parts—MB3045S-E3/4W, VBT3045BP-M3/4W, and STPS745G-TR—are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level) rating.

Q: What is the maximum junction temperature for each part?

A: The MB3045S-E3/4W operates to 150°C maximum junction temperature. The VBT3045BP-M3/4W also operates to 150°C maximum. The STPS745G-TR operates to 175°C maximum junction temperature, providing higher thermal margin in applications with elevated ambient conditions.