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-220AC package. Manufactured by Diodes Incorporated, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same electrical specifications and mechanical form factor while offering active product support and availability.

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
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBR745 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io): 7.5 A minimum
Package / Case: TO-220-2
Mounting Type: Through Hole
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within typical Schottky diode range
Current - Reverse Leakage @ Vr: Within acceptable limits for Schottky technology
Operating Temperature - Junction: Extended range acceptable for active products
Product Status: Active products preferred over obsolete

Substitute parts are grouped into three categories: direct equivalents (identical electrical and mechanical specifications), upgrades (higher current rating or improved thermal performance), and alternative sources (same base specifications from different manufacturers).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Product Status	Temp Range
MBR745	Diodes Incorporated	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	TO-220-2	Obsolete	-55°C ~ 150°C
MBR745-E3/45	Vishay General Semiconductor - Diodes Division	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	TO-220-2	Active	-65°C ~ 175°C
STPS745D	STMicroelectronics	45 V	7.5 A	840 mV @ 15 A	100 µA @ 45 V	TO-220-2	Active	-55°C ~ 175°C
MBR745-BP	Micro Commercial Co	45 V	7.5 A	—	100 µA @ 45 V	TO-220-2	Active	-55°C ~ 150°C
MBR740-BP	Micro Commercial Co	40 V	7.5 A	—	100 µA @ 40 V	TO-220-2	Active	-55°C ~ 150°C
DSS10-0045A	IXYS	45 V	10 A	680 mV @ 10 A	300 µA @ 45 V	TO-220-2	Active	-55°C ~ 175°C
VT2045BP-M3/4W	Vishay General Semiconductor - Diodes Division	45 V	20 A	660 mV @ 20 A	2 mA @ 45 V	TO-220-2	Active	-55°C ~ 200°C

Engineering Selection Recommendations

Direct Equivalent Substitutes (Identical Electrical and Mechanical Specifications):

MBR745-E3/45 (Vishay General Semiconductor - Diodes Division) and STPS745D (STMicroelectronics) are direct functional equivalents to the obsolete MBR745. Both parts maintain 45 V reverse voltage, 7.5 A average rectified current, and TO-220-2 package configuration. Both are active products with ROHS3 compliance and REACH unaffected status. MBR745-E3/45 extends the operating temperature range to -65°C ~ 175°C. STPS745D provides a maximum junction temperature of 175°C. Both are suitable for direct replacement in existing designs.

Alternative Source (Same Base Specifications):

MBR745-BP (Micro Commercial Co) provides identical electrical specifications to the original MBR745 with 45 V reverse voltage and 7.5 A current rating in TO-220-2 package. This part is active product status with REACH unaffected designation. Operating temperature range matches the original at -55°C ~ 150°C.

Lower Voltage Alternative:

MBR740-BP (Micro Commercial Co) is rated for 40 V reverse voltage with 7.5 A current. This part is suitable only for applications where the maximum reverse voltage requirement does not exceed 40 V. It maintains the same TO-220-2 package and 7.5 A current rating.

Higher Current Upgrades:

DSS10-0045A (IXYS) provides 10 A average rectified current at 45 V reverse voltage in TO-220-2 package. This upgrade is suitable for applications requiring higher current capacity while maintaining the same voltage rating.

VT2045BP-M3/4W (Vishay General Semiconductor - Diodes Division, TMBS® series) provides 20 A average rectified current at 45 V reverse voltage in TO-220-2 package. This upgrade offers significantly higher current capacity and extended operating temperature to 200°C maximum junction temperature. This part is suitable for high-current applications requiring the same voltage rating.

Frequently Asked Questions (FAQ)

Q: Can MBR745-E3/45 be used as a direct replacement for the obsolete MBR745?

A: Yes. MBR745-E3/45 maintains identical electrical specifications: 45 V reverse voltage, 7.5 A average rectified current, 840 mV forward voltage at 15 A, and TO-220-2 package. The part is active product status from Vishay General Semiconductor - Diodes Division with extended operating temperature range to -65°C ~ 175°C.

Q: What is the difference between STPS745D and MBR745-E3/45?

A: Both parts are direct electrical equivalents with 45 V reverse voltage and 7.5 A current rating in TO-220-2 package. STPS745D is manufactured by STMicroelectronics, while MBR745-E3/45 is from Vishay General Semiconductor - Diodes Division. STPS745D specifies maximum junction temperature of 175°C, while MBR745-E3/45 specifies operating range of -65°C ~ 175°C. Both are active products with ROHS3 compliance.

Q: Can MBR740-BP replace MBR745 in all applications?

A: MBR740-BP is suitable only for applications where the maximum reverse voltage requirement does not exceed 40 V. The original MBR745 is rated for 45 V reverse voltage. MBR740-BP maintains the same 7.5 A current rating and TO-220-2 package. Verify circuit maximum reverse voltage before substitution.

Q: What are the advantages of DSS10-0045A over the original MBR745?

A: DSS10-0045A provides 10 A average rectified current compared to 7.5 A in the MBR745, while maintaining the same 45 V reverse voltage rating and TO-220-2 package. This upgrade is suitable for applications requiring higher current capacity. Forward voltage is 680 mV at 10 A, compared to 840 mV at 15 A in the original.

Q: When should VT2045BP-M3/4W be selected over direct equivalents?

A: VT2045BP-M3/4W is selected for applications requiring higher current capacity (20 A versus 7.5 A) at the same 45 V reverse voltage rating. This part also offers extended operating temperature to 200°C maximum junction temperature and lower forward voltage (660 mV at 20 A). The TO-220-2 package remains compatible with existing board layouts.

Q: Are all substitute parts ROHS3 compliant?

A: MBR745-E3/45, STPS745D, and VT2045BP-M3/4W are explicitly ROHS3 compliant. MBR745-BP and MBR740-BP do not specify ROHS status in the provided data. Verify compliance requirements for your specific application before final selection.

Q: What is the difference in reverse leakage current between substitute parts?

A: MBR745, MBR745-E3/45, STPS745D, and MBR745-BP all specify 100 µA reverse leakage at 45 V. MBR740-BP specifies 100 µA at 40 V. DSS10-0045A specifies 300 µA at 45 V. VT2045BP-M3/4W specifies 2 mA at 45 V. Higher leakage current may affect circuit performance in low-current applications.

Q: Can substitute parts be used interchangeably in existing PCB designs?

A: All substitute parts maintain the TO-220-2 package and through-hole mounting type, allowing direct PCB footprint compatibility. Electrical parameter differences (current rating, forward voltage, leakage current) must be verified against circuit design requirements before substitution.

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