MBR745 Equivalent & Substitute Parts

Part Overview

The MBR745 is a Schottky rectifier diode rated for 45 V DC reverse voltage and 7.5 A average rectified current in a Through Hole TO-220-2 package. The original Vishay General Semiconductor - Diodes Division MBR745 is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production builds and field replacements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 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 @ 45 V
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the MBR745 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io): 7.5 A
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 840 mV @ 15 A (identical across all active substitutes)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (identical across all substitutes)
Current - Reverse Leakage @ Vr: 100 µA @ 45 V (identical across all substitutes)
Operating Temperature - Junction: May vary within functional range

Substitute parts are grouped into three categories based on electrical equivalence and product status:

Parametric Equivalent (Active Status): Parts with identical electrical specifications and active product status.

Upgrade Alternative (Enhanced Specifications): Parts with identical core electrical specifications but extended operating temperature range or improved compliance status.

Downgrade Alternative (Reduced Specifications): Parts with reduced voltage rating but identical current rating and compatible package.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Tj (Max)	Product Status	RoHS Status
MBR745	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	840 mV @ 15 A	TO-220-2	150°C	Obsolete	RoHS non-compliant
VS-MBR745-M3	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	840 mV @ 15 A	TO-220-2	150°C	Active	ROHS3 Compliant
MBR745G	onsemi	45 V	7.5 A	840 mV @ 15 A	TO-220-2	175°C	Active	ROHS3 Compliant
MBR740-BP	Micro Commercial Co	40 V	7.5 A	Not specified	TO-220-2	150°C	Active	Not specified
MBR745	Taiwan Semiconductor Corporation	45 V	7.5 A	Not specified	TO-220-2	150°C	Active	ROHS3 Compliant
MBR745-BP	Micro Commercial Co	45 V	7.5 A	Not specified	TO-220-2	150°C	Active	Not specified
STPS745D	STMicroelectronics	45 V	7.5 A	840 mV @ 15 A	TO-220-2	175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent (Preferred for Obsolete Part Replacement):

VS-MBR745-M3 (Vishay General Semiconductor - Diodes Division) is the primary parametric equivalent. This part maintains identical electrical specifications to the original MBR745 while offering active product status and ROHS3 compliance. The part is supplied in Tube packaging and carries unlimited moisture sensitivity level (MSL 1).

MBR745 (Taiwan Semiconductor Corporation) provides an alternative parametric equivalent with active product status and ROHS3 compliance. This part maintains identical core electrical specifications and is suitable for direct substitution in applications where the original Vishay part is unavailable.

Upgrade Alternative (Enhanced Operating Temperature):

MBR745G (onsemi) and STPS745D (STMicroelectronics) both offer extended maximum junction temperature ratings of 175°C compared to the original 150°C specification. Both parts maintain identical electrical performance across voltage, current, and switching characteristics. MBR745G is part of the onsemi SWITCHMODE™ series. Both parts carry ROHS3 compliance and active product status.

Downgrade Alternative (Reduced Voltage Rating):

MBR740-BP (Micro Commercial Co) operates at a reduced maximum reverse voltage of 40 V compared to the 45 V specification of the original MBR745. This part is suitable only for applications where the circuit design operates below 40 V reverse bias. The part maintains identical 7.5 A current rating and fast recovery switching characteristics.

Packaging Considerations:

VS-MBR745-M3 is supplied in Tube packaging. MBR745G and STPS745D are supplied in Tube packaging. MBR740-BP and MBR745-BP are supplied in Bulk packaging. The original MBR745 packaging specification is not defined in available data.

Frequently Asked Questions (FAQ)

Q: Can VS-MBR745-M3 be used as a direct replacement for the obsolete Vishay MBR745?

A: Yes. VS-MBR745-M3 is a parametric equivalent manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications: 45 V reverse voltage, 7.5 A average rectified current, 840 mV forward voltage at 15 A, and fast recovery switching characteristics. The part carries active product status and ROHS3 compliance.

Q: What is the difference between MBR745G and STPS745D?

A: Both parts are parametric equivalents with identical electrical specifications and extended operating temperature range to 175°C. MBR745G is manufactured by onsemi and is part of the SWITCHMODE™ series. STPS745D is manufactured by STMicroelectronics. Both carry ROHS3 compliance and active product status. Selection between these parts depends on supply chain availability and preferred manufacturer qualification.

Q: Can MBR740-BP be used in place of MBR745?

A: MBR740-BP is suitable only for applications where the maximum reverse voltage requirement does not exceed 40 V. The part is rated for 40 V maximum reverse voltage compared to the 45 V specification of MBR745. All other electrical parameters including 7.5 A current rating and fast recovery switching characteristics are identical. Circuit design review is required to confirm voltage margin compatibility.

Q: What is the significance of the packaging designation (Tube vs. Bulk)?

A: Tube and Bulk packaging refer to the quantity and presentation format of components during shipment and storage. Tube packaging typically contains smaller quantities in organized reels suitable for automated assembly. Bulk packaging contains larger quantities in loose or tape format. Electrical performance and component specifications are identical regardless of packaging format. Selection depends on production volume requirements and assembly equipment compatibility.

Q: Are all substitute parts RoHS compliant?

A: The original Vishay MBR745 is RoHS non-compliant. All active substitute parts listed (VS-MBR745-M3, MBR745G, MBR745 from Taiwan Semiconductor Corporation, and STPS745D) carry ROHS3 compliance. MBR740-BP and MBR745-BP from Micro Commercial Co do not specify RoHS status in available data. Design requirements for RoHS compliance should be confirmed before final part selection.

Q: What is the operating temperature range difference between the original MBR745 and upgrade alternatives?

A: The original Vishay MBR745 is rated for -65°C to 150°C junction temperature. MBR745G (onsemi) and STPS745D (STMicroelectronics) extend the maximum junction temperature to 175°C. This 25°C increase provides additional thermal margin in high-temperature applications. The minimum operating temperature remains within the -55°C to -65°C range across all parts.

Q: Can multiple substitute parts be used interchangeably within the same design?

A: Yes, for applications where the circuit design operates within the common electrical specification envelope. All parametric equivalents (VS-MBR745-M3, MBR745 from Taiwan Semiconductor Corporation, MBR745G, and STPS745D) maintain identical 45 V reverse voltage and 7.5 A current ratings with identical switching characteristics. Thermal design review is recommended when mixing parts with different maximum junction temperature ratings (150°C vs. 175°C) within the same assembly.

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