MB3045S-E3/8W Equivalent & Substitute Parts

Part Overview

The MB3045S-E3/8W 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 meeting the same packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	30	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 30 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MB3045S-E3/8W are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 30 A minimum
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute Classification:

Group 1 - Direct Equivalent (Full Parameter Match): VBT3045BP-M3/8W meets all critical electrical parameters (45 V, 30 A) and maintains identical packaging, compliance, and thermal specifications. This part is manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) and carries active product status.

Group 2 - Partial Substitute (Voltage/Package Compatible, Current Derating Required): STPS745G-TR maintains the 45 V reverse voltage rating and TO-263AB package compatibility but is rated for 7.5 A average rectified current. This part is suitable only for applications where the actual current requirement does not exceed 7.5 A, representing a current derating of 75% relative to the original specification.

Parameter Comparison

Parameter	MB3045S-E3/8W	VBT3045BP-M3/8W	STPS745G-TR
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Product Status	Obsolete	Active	Active
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V
Current - Average Rectified (Io)	30 A	30 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 30 A	700 mV @ 30 A	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V	2 mA @ 45 V	100 µA @ 45 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Operating Temperature - Junction	-65°C ~ 150°C	-40°C ~ 150°C	Max 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitute: VBT3045BP-M3/8W

The VBT3045BP-M3/8W is the recommended substitute for the obsolete MB3045S-E3/8W. This part maintains full electrical equivalence across all critical parameters: 45 V reverse voltage rating, 30 A average rectified current, identical forward voltage characteristics, and matching fast recovery speed. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical TO-263AB packaging. The VBT3045BP-M3/8W carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The primary difference is packaging format: the original part is supplied in bulk, while the substitute is supplied in Tape & Reel format, which is standard for high-volume surface mount assembly operations.

Secondary Substitute: STPS745G-TR

The STPS745G-TR is a partial substitute suitable only for applications where the actual circuit current requirement does not exceed 7.5 A. This part maintains the 45 V reverse voltage rating and TO-263AB package compatibility but operates at 25% of the original part's current rating. The STPS745G-TR is manufactured by STMicroelectronics and carries active product status. Forward voltage at reduced current (840 mV @ 15 A) is higher than the original specification. This part is ROHS3 compliant with MSL 1 (Unlimited) rating. Selection of this part requires verification that circuit current demands remain within the 7.5 A maximum rating.

Frequently Asked Questions (FAQ)

Q: Can VBT3045BP-M3/8W be used as a direct replacement for MB3045S-E3/8W?

A: Yes. The VBT3045BP-M3/8W is a direct electrical equivalent. Both parts share identical voltage ratings (45 V), current ratings (30 A), forward voltage characteristics (700 mV @ 30 A), and TO-263AB packaging. The only difference is packaging format: bulk versus Tape & Reel. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between the MB3045S-E3/8W and VBT3045BP-M3/8W in terms of reverse leakage current?

A: The MB3045S-E3/8W specifies 200 µA reverse leakage at 45 V, while the VBT3045BP-M3/8W specifies 2 mA reverse leakage at 45 V. This represents a 10-fold increase in leakage current for the substitute part. Applications sensitive to reverse leakage characteristics must account for this difference in circuit design.

Q: Can STPS745G-TR replace MB3045S-E3/8W in all applications?

A: No. The STPS745G-TR is rated for 7.5 A average rectified current, compared to the original part's 30 A rating. This part is suitable only for applications where actual circuit current does not exceed 7.5 A. Use of this part in circuits requiring 30 A operation will result in component failure.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the TO-263-3, D2PAK (2 Leads + Tab), TO-263AB package, ensuring mechanical and electrical compatibility with the same PCB footprint and solder pad layout.

Q: What is the operating temperature range difference between MB3045S-E3/8W and VBT3045BP-M3/8W?

A: The MB3045S-E3/8W operates from -65°C to 150°C junction temperature, while the VBT3045BP-M3/8W operates from -40°C to 150°C. The substitute part has a narrower lower temperature limit by 25°C. Applications requiring operation below -40°C must use the original part or identify an alternative.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both VBT3045BP-M3/8W and STPS745G-TR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original MB3045S-E3/8W.

Q: What is the primary reason to select VBT3045BP-M3/8W over STPS745G-TR?

A: The VBT3045BP-M3/8W maintains full electrical equivalence with the original part, including the 30 A current rating and lower reverse leakage current (2 mA versus 100 µA for STPS745G-TR). Selection of VBT3045BP-M3/8W eliminates the need for circuit current derating and maintains original performance specifications.

Q: Does packaging format (bulk versus Tape & Reel) affect electrical performance?

A: No. Packaging format affects supply chain logistics and assembly process compatibility but does not alter electrical performance. Both bulk and Tape & Reel formats contain identical components with identical electrical characteristics.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message