MBR4045CT Equivalent & Substitute Parts

Part Overview

The MBR4045CT is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as 1 pair common cathode with 45 V reverse voltage rating and 20 A average rectified current per diode. The device is packaged in TO-220-3 through-hole format and is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Cathode
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io) (per Diode)	20 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBR4045CT is determined by the following critical parameters: diode configuration (1 pair common cathode), technology type (Schottky), reverse voltage rating (45 V maximum), average rectified current per diode (20 A), mounting type (through hole), and package format (TO-220-3). Parts meeting all these core electrical and mechanical specifications are classified as parametric equivalents. Parts with reduced current ratings (10 A, 15 A, 7.5 A) or alternative voltage ratings (40 V) are classified as functional substitutes suitable for applications with lower current or voltage requirements. Parts with active product status and RoHS3 compliance are prioritized for new designs.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Technology	Tj (Operating)	Product Status	RoHS Status
MBR4045CT	Vishay	45 V	20 A	600 mV @ 20 A	Schottky	-65°C ~ 150°C	Obsolete	Non-compliant
VX40M45C-M3/P	Vishay	45 V	20 A	600 mV @ 20 A	Schottky	-40°C ~ 175°C	Active	ROHS3 Compliant
VX40M45CHM3/P	Vishay	45 V	20 A	600 mV @ 20 A	Schottky	-40°C ~ 175°C	Active	ROHS3 Compliant
MBR20L45CTG	onsemi	45 V	10 A	500 mV @ 10 A	Schottky	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
MBR2545CTG	onsemi	45 V	15 A	620 mV @ 15 A	Schottky	-65°C ~ 175°C	Active	ROHS3 Compliant
SBR4040CT	Diodes Incorporated	40 V	20 A	530 mV @ 20 A	Super Barrier	-65°C ~ 150°C	Active	ROHS3 Compliant
STPS1545CT	STMicroelectronics	45 V	7.5 A	570 mV @ 7.5 A	Schottky	-65°C ~ 175°C	Active	ROHS3 Compliant
STPS40L45CT	STMicroelectronics	45 V	20 A	530 mV @ 20 A	Schottky	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Full Replacement Capability)

VX40M45C-M3/P and VX40M45CHM3/P from Vishay are parametric equivalents meeting all electrical and mechanical specifications of the MBR4045CT. Both parts maintain 45 V reverse voltage, 20 A average rectified current, and TO-220-3 package format. These parts feature active product status, ROHS3 compliance, and automotive-grade qualification (AEC-Q101). Operating temperature range extends to 175°C maximum junction temperature, exceeding the original part specification. These are direct replacements for new designs.

STPS40L45CT from STMicroelectronics is a parametric equivalent with identical 45 V reverse voltage and 20 A current rating in TO-220-3 package. The part maintains active product status and ROHS3 compliance. Forward voltage is reduced to 530 mV at 20 A, providing improved efficiency characteristics. Operating temperature maximum is 150°C, matching the original part specification.

Functional Substitutes (Current-Reduced Applications)

MBR2545CTG from onsemi provides 15 A average rectified current with 45 V reverse voltage rating. This part is suitable for applications requiring reduced current capacity. Active product status and ROHS3 compliance are confirmed. Operating temperature range extends to 175°C maximum junction temperature.

MBR20L45CTG from onsemi provides 10 A average rectified current with 45 V reverse voltage rating. This part is suitable for lower-current applications. ROHS3 compliance is confirmed, though product status is obsolete.

STPS1545CT from STMicroelectronics provides 7.5 A average rectified current with 45 V reverse voltage rating. This part is suitable for applications with significantly reduced current requirements. Active product status and ROHS3 compliance are confirmed.

Voltage-Reduced Substitute

SBR4040CT from Diodes Incorporated maintains 20 A average rectified current but reduces reverse voltage rating to 40 V. This part uses Super Barrier technology instead of Schottky. Active product status and ROHS3 compliance are confirmed. This substitute is applicable only when 40 V reverse voltage rating is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can VX40M45C-M3/P or VX40M45CHM3/P be used as direct replacements for MBR4045CT?

A: Yes. Both Vishay parts are parametric equivalents with identical 45 V reverse voltage, 20 A average rectified current per diode, and TO-220-3 package format. All critical electrical and mechanical parameters match the original part. Both parts feature active product status and ROHS3 compliance, making them suitable for new designs.

Q: What is the difference between VX40M45C-M3/P and VX40M45CHM3/P?

A: Both parts are parametric equivalents with identical electrical specifications and package format. The primary difference is part number designation. Both maintain 45 V reverse voltage, 20 A current rating, and automotive-grade qualification (AEC-Q101). Inventory availability differs between the two part numbers.

Q: Can MBR2545CTG be used in place of MBR4045CT?

A: MBR2545CTG is a functional substitute with reduced current capacity (15 A versus 20 A). This part is suitable only for applications where the maximum required current does not exceed 15 A per diode. The 45 V reverse voltage rating and TO-220-3 package remain compatible. Active product status and ROHS3 compliance are confirmed.

Q: Is STPS40L45CT compatible with MBR4045CT applications?

A: STPS40L45CT is a parametric equivalent with identical 45 V reverse voltage, 20 A average rectified current, and TO-220-3 package format. Forward voltage is reduced to 530 mV at 20 A, providing improved efficiency. Active product status and ROHS3 compliance are confirmed. This part is suitable for direct replacement.

Q: Can SBR4040CT replace MBR4045CT?

A: SBR4040CT is a voltage-reduced substitute with 40 V reverse voltage rating (versus 45 V) and identical 20 A current rating. This part is suitable only for applications where 40 V reverse voltage rating is acceptable. The part uses Super Barrier technology instead of Schottky. Active product status and ROHS3 compliance are confirmed.

Q: What is the significance of the TO-220-3 package format?

A: TO-220-3 is a through-hole package with three leads, suitable for through-hole PCB mounting. All listed substitute parts maintain this package format, ensuring mechanical compatibility with existing PCB designs. Package format is a critical parameter for substitution.

Q: Why is MBR4045CT classified as obsolete?

A: MBR4045CT is classified as obsolete product status by the manufacturer. Parametric equivalents with active product status (VX40M45C-M3/P, VX40M45CHM3/P, STPS40L45CT) are available for new designs and ongoing production requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are ROHS3 compliant except MBR20L45CTG, which is ROHS3 compliant but classified as obsolete. The original MBR4045CT is RoHS non-compliant. RoHS3 compliance is a regulatory requirement for new designs in many markets.

Q: What is the difference between Schottky and Super Barrier technology?

A: Both are fast-recovery diode technologies. SBR4040CT uses Super Barrier technology, while MBR4045CT and most substitute parts use Schottky technology. Both technologies provide fast recovery characteristics (≤ 500 ns). Technology differences may affect forward voltage characteristics and leakage current specifications.

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