MBRB735-E3/81 Equivalent & Substitute Parts

Part Overview

The MBRB735-E3/81 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 35 V DC reverse voltage and 7.5 A average rectified current in a surface mount TO-263AB (D2PAK) package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while supporting the same mechanical package configuration.

Key Parameters

Parameter	Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V
Current - Average Rectified (Io)	7.5 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 35 V
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MBRB735-E3/81 are qualified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Schottky diode technology
Surface mount D2PAK package configuration
Forward voltage characteristic of 840 mV @ 15 A
Fast recovery speed specification (≤ 500ns, > 200mA)
Reverse leakage current of 100 µA at rated voltage
RoHS3 compliance and MSL 1 rating
Operating temperature range support

Voltage Rating Consideration: Substitute parts with equal or higher DC reverse voltage ratings (Vr) are electrically compatible with the MBRB735-E3/81 in applications designed for 35 V operation. Parts rated at 45 V maintain all other electrical parameters while providing additional voltage margin.

Current Rating: All qualified substitutes maintain the 7.5 A average rectified current specification, ensuring equivalent thermal and power handling characteristics.

Parameter Comparison

Parameter	MBRB735-E3/81	MBRB745-E3/81	STPS745G-TR
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	35 V	45 V	45 V
Current - Average Rectified (Io)	7.5 A	7.5 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	840 mV @ 15 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	100 µA @ 35 V	100 µA @ 45 V	100 µA @ 45 V
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-65°C to 175°C (Max)
Product Status	Obsolete	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MBRB745-E3/81 (Vishay General Semiconductor - Diodes Division)

The MBRB745-E3/81 is a direct manufacturer-recommended substitute for the obsolete MBRB735-E3/81. This part maintains identical electrical performance across all specified parameters while offering a higher DC reverse voltage rating of 45 V. The MBRB745-E3/81 carries Last Time Buy status, indicating limited future availability. This part is ROHS3 compliant with MSL 1 rating and is suitable for applications requiring Vishay component continuity.

STPS745G-TR (STMicroelectronics)

The STPS745G-TR is an active production alternative from STMicroelectronics, providing equivalent electrical specifications with a 45 V DC reverse voltage rating. This part maintains the same forward voltage, current rating, and fast recovery speed characteristics. The STPS745G-TR features an extended maximum junction temperature of 175°C compared to 150°C for the original part, offering enhanced thermal performance. ROHS3 compliance and MSL 1 rating are maintained. This part is recommended for new designs requiring long-term component availability and active manufacturer support.

Both substitute parts are electrically and mechanically compatible with the MBRB735-E3/81 in applications designed for 35 V operation, with the higher voltage ratings providing additional design margin.

Frequently Asked Questions (FAQ)

Q: Can the MBRB745-E3/81 directly replace the MBRB735-E3/81 in existing designs?

A: Yes. The MBRB745-E3/81 maintains all electrical specifications of the MBRB735-E3/81, including forward voltage, current rating, and recovery speed. The 45 V reverse voltage rating is higher than the original 35 V specification, making it suitable for 35 V applications with additional voltage margin.

Q: What is the difference between the MBRB745-E3/81 and STPS745G-TR?

A: Both parts share identical electrical specifications: 45 V reverse voltage, 7.5 A current rating, and 840 mV forward voltage. The primary differences are manufacturer (Vishay versus STMicroelectronics), product status (Last Time Buy versus Active), and maximum junction temperature (150°C versus 175°C). The STPS745G-TR offers longer-term availability and higher thermal capability.

Q: Are all substitute parts in the same D2PAK package?

A: Yes. The MBRB735-E3/81, MBRB745-E3/81, and STPS745G-TR are all housed in the TO-263-3 D2PAK (2 Leads + Tab) surface mount package, ensuring mechanical and PCB layout compatibility.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both the MBRB745-E3/81 and STPS745G-TR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the original MBRB735-E3/81.

Q: Which substitute part should be selected for new designs?

A: The STPS745G-TR is recommended for new designs due to its active production status, extended thermal capability (175°C maximum junction temperature), and long-term manufacturer support from STMicroelectronics.

Q: Can these parts be used interchangeably in high-temperature applications?

A: The STPS745G-TR supports operation up to 175°C maximum junction temperature, compared to 150°C for the MBRB745-E3/81 and original MBRB735-E3/81. For applications approaching or exceeding 150°C junction temperature, the STPS745G-TR provides additional thermal margin.

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