VS-MBR745PBF Schottky Diode Equivalent & Substitute Parts

Part Overview

The VS-MBR745PBF is a 45V, 7.5A Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division in a TO-220AC through-hole package. This component is designed for fast recovery applications requiring reverse voltage ratings up to 45V with average rectified current capacity of 7.5A. The VS-MBR745PBF is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts that maintain electrical and mechanical compatibility for existing designs and new procurement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	7.5	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	mV @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the VS-MBR745PBF is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 45V minimum
Current - Average Rectified (Io): 7.5A minimum
Voltage - Forward (Vf) (Max) @ If: 840 mV @ 15 A maximum
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 100 µA @ 45 V maximum
Mounting Type: Through Hole
Package / Case: TO-220-2
Technology: Schottky

Substitute Categories:

Direct Equivalent (Identical Electrical & Mechanical Specifications): VS-MBR745-M3 maintains all electrical parameters and mechanical compatibility with identical packaging and performance characteristics.

Upgrade Substitutes (Enhanced Operating Temperature or Availability): MBR745G (onsemi) and STPS745D (STMicroelectronics) meet all electrical specifications with extended or equivalent temperature ratings and active product status.

Partial Substitutes (Reduced Voltage Rating): MBR740-BP meets all electrical specifications except voltage rating is reduced to 40V, suitable only for applications with maximum reverse voltage ≤ 40V.

Alternative Equivalent (Identical Specifications, Different Packaging): MBR745-BP provides electrical equivalence with bulk packaging option.

Parameter Comparison

Parameter	VS-MBR745PBF	VS-MBR745-M3	MBR745G	STPS745D	MBR740-BP	MBR745-BP
Manufacturer	Vishay	Vishay	onsemi	STMicroelectronics	Micro Commercial Co	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	40 V	45 V
Current - Average Rectified (Io)	7.5 A	7.5 A	7.5 A	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	840 mV @ 15 A	Not Specified	Not Specified
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 40 V	100 µA @ 45 V
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	Not Specified

Engineering Selection Recommendations

First Priority - Direct Equivalent: VS-MBR745-M3 is the primary substitute for VS-MBR745PBF. This part maintains identical electrical specifications, mechanical compatibility, and operating temperature range. The part is in active production status with 8,866 pieces in stock, ensuring long-term availability. ROHS3 compliance is maintained.

Second Priority - Upgrade Substitutes: MBR745G (onsemi) and STPS745D (STMicroelectronics) are suitable upgrades offering extended maximum junction temperature ratings (175°C versus 150°C). Both parts maintain all critical electrical parameters and are in active production. MBR745G offers the highest inventory availability at 21,700 pieces. Both parts satisfy ROHS3 compliance requirements.

Third Priority - Alternative Equivalent: MBR745-BP provides electrical equivalence with bulk packaging. This part is suitable for applications where packaging format is not a constraint. Product status is active with 780 pieces in stock.

Not Recommended for Direct Substitution: MBR740-BP has a reduced maximum reverse voltage rating of 40V. This part is suitable only for applications where the maximum reverse voltage requirement does not exceed 40V. Use of this part in circuits designed for 45V operation creates risk of component failure.

Frequently Asked Questions (FAQ)

Q: Can VS-MBR745-M3 be used as a direct replacement for VS-MBR745PBF?

A: Yes. VS-MBR745-M3 is a direct equivalent with identical electrical specifications (45V, 7.5A, 840 mV forward voltage, fast recovery ≤ 500ns), identical package (TO-220-2), and identical operating temperature range (-65°C to 150°C). The primary difference is packaging format (tube versus original packaging) and active product status.

Q: What is the difference between MBR745G and STPS745D?

A: Both parts meet all electrical specifications of the VS-MBR745PBF. MBR745G is manufactured by onsemi with maximum junction temperature of 175°C. STPS745D is manufactured by STMicroelectronics with maximum junction temperature of 175°C. Both are in active production. Selection between these parts depends on supply chain preference and inventory availability.

Q: Why is MBR740-BP listed as a substitute if the voltage rating is different?

A: MBR740-BP is listed as a partial substitute for applications where the maximum reverse voltage requirement is 40V or less. For circuits designed for 45V operation, MBR740-BP is not suitable and creates risk of component failure under reverse voltage conditions exceeding 40V.

Q: Are all substitute parts RoHS compliant?

A: VS-MBR745-M3, MBR745G, and STPS745D are confirmed ROHS3 compliant. MBR740-BP and MBR745-BP RoHS status is not specified in available documentation.

Q: What is the impact of operating temperature range differences?

A: VS-MBR745PBF, VS-MBR745-M3, MBR740-BP, and MBR745-BP operate from -65°C to 150°C (or -55°C for Micro Commercial Co parts). MBR745G and STPS745D extend the maximum junction temperature to 175°C. For applications operating near the upper temperature limit, the extended temperature rating of MBR745G or STPS745D provides additional thermal margin.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes, all substitute parts use identical TO-220-2 package with through-hole mounting. PCB layouts and thermal management designs require no modification. Pin configuration and mechanical dimensions are identical across all listed parts.

Q: Which substitute offers the best long-term availability?

A: MBR745G (onsemi) offers the highest current inventory at 21,700 pieces and is in active production status, providing the strongest long-term availability assurance.

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