MBR735 Equivalent & Substitute Parts

Part Overview

The MBR735 is a Schottky rectifier diode rated for 35 V DC reverse voltage and 7.5 A average rectified current in a through-hole TO-220AC package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts with active availability are necessary for new designs and ongoing production requirements. Substitute options maintain the core electrical specifications while offering improved product status, compliance certifications, or enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	7.5	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 35 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBR735 is determined by equivalence in the following critical parameters: voltage rating (Vr), current rating (Io), forward voltage (Vf), switching speed, reverse leakage current, mounting type, and package configuration. Parts are grouped into the following categories:

Parametric Equivalents (Same Electrical Specifications, Active Status): Parts that maintain identical electrical ratings and package type while offering active product status and improved compliance certifications.

Manufacturer Alternatives (Same Electrical Specifications, Different Manufacturer): Parts from alternative manufacturers with matching electrical and mechanical specifications, enabling cross-manufacturer substitution.

Upgraded Specifications (Enhanced Voltage or Temperature Rating): Parts that exceed the original specifications in voltage rating or maximum junction temperature while maintaining current capacity and package compatibility.

The following parameters must remain constant for direct substitution: 7.5 A average rectified current, fast recovery switching speed (≤ 500ns), through-hole mounting, and TO-220-2 package configuration.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 15A	Speed	Ir @ Vr	Package	Mounting	Tj (Max)	Product Status	RoHS Status
MBR735	Vishay General Semiconductor	35 V	7.5 A	840 mV	≤ 500ns	100 µA @ 35V	TO-220-2	Through Hole	150°C	Obsolete	Non-compliant
VS-MBR735-M3	Vishay General Semiconductor	35 V	7.5 A	840 mV	≤ 500ns	100 µA @ 35V	TO-220-2	Through Hole	150°C	Active	ROHS3 Compliant
MBR735G	onsemi	35 V	7.5 A	840 mV	≤ 500ns	100 µA @ 35V	TO-220-2	Through Hole	175°C	Obsolete	ROHS3 Compliant
STPS745D	STMicroelectronics	45 V	7.5 A	840 mV	≤ 500ns	100 µA @ 45V	TO-220-2	Through Hole	175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): VS-MBR735-M3 from Vishay General Semiconductor provides direct parametric equivalence to the MBR735 with active product status and ROHS3 compliance. This part maintains identical electrical specifications and through-hole TO-220-2 package configuration, enabling direct replacement without circuit redesign.

Alternative Substitute (Enhanced Specifications): STPS745D from STMicroelectronics offers a 45 V reverse voltage rating compared to the original 35 V specification, with identical 7.5 A current capacity and matching forward voltage characteristics. This part is active and ROHS3 compliant. The elevated voltage rating provides additional design margin in applications where reverse voltage stress may approach the original 35 V limit. Maximum junction temperature is rated at 175°C, exceeding the original 150°C specification.

Cross-Manufacturer Option (Obsolete Status): MBR735G from onsemi maintains identical electrical specifications with a maximum junction temperature of 175°C and ROHS3 compliance. However, this part carries obsolete product status, limiting its suitability for new production.

Surface Mount Alternative (Different Mounting Type): MBR735 from Solid State Inc. in DO-220AA package provides parametric equivalence in voltage and current ratings but uses surface-mount technology rather than through-hole mounting. This option is applicable only to designs with surface-mount PCB layouts.

Selection should prioritize VS-MBR735-M3 for applications requiring direct replacement with active product status and regulatory compliance. STPS745D is appropriate for designs where enhanced voltage margin is beneficial and higher junction temperature operation is required.

Frequently Asked Questions (FAQ)

Q: Can VS-MBR735-M3 be used as a direct replacement for MBR735?

A: Yes. VS-MBR735-M3 maintains identical electrical specifications (35 V, 7.5 A, 840 mV forward voltage) and through-hole TO-220-2 package configuration. The primary differences are active product status and ROHS3 compliance certification. No circuit modifications are required.

Q: What is the difference between MBR735 and STPS745D?

A: STPS745D has a higher reverse voltage rating of 45 V compared to MBR735's 35 V specification. All other electrical parameters remain identical: 7.5 A current, 840 mV forward voltage, and fast recovery switching speed. STPS745D also offers a higher maximum junction temperature of 175°C versus 150°C. STPS745D is suitable for applications requiring additional voltage margin.

Q: Why is the MBR735 listed as obsolete?

A: The MBR735 from Vishay General Semiconductor carries obsolete product status, indicating discontinued manufacturing and limited availability. Active equivalent parts such as VS-MBR735-M3 are recommended for new designs and ongoing production.

Q: Can the surface-mount MBR735 from Solid State Inc. replace the through-hole version?

A: No. The surface-mount MBR735 (DO-220AA package) is not compatible with through-hole PCB layouts designed for the TO-220-2 package. Substitution requires PCB redesign and is applicable only to new surface-mount designs.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials in electrical and electronic equipment. VS-MBR735-M3, MBR735G, and STPS745D all carry ROHS3 certification, while the original MBR735 is non-compliant.

Q: Are there any temperature rating differences between substitutes?

A: Yes. The original MBR735 is rated to 150°C maximum junction temperature. VS-MBR735-M3 maintains this 150°C rating. MBR735G and STPS745D both offer 175°C maximum junction temperature, providing enhanced thermal performance for high-temperature applications.

Q: What is the significance of the 100 µA reverse leakage current specification?

A: Reverse leakage current indicates the small current flowing through the diode when reverse biased. The 100 µA specification at rated reverse voltage is consistent across all substitutes, ensuring equivalent leakage characteristics and circuit performance.

Q: Can STPS745D be used in applications designed for 35 V operation?

A: Yes. STPS745D's 45 V rating exceeds the 35 V requirement, providing additional safety margin. The part is fully compatible with 35 V circuit designs. The higher voltage rating does not degrade performance in lower-voltage applications.

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