MBR2045CT Equivalent & Substitute Parts

Part Overview

The MBR2045CT is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 10 A per diode. The device is packaged in TO-220-3 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers 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)	10 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MBR2045CT is determined by the following critical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 10 A minimum
Package / Case: TO-220-3
Mounting Type: Through Hole

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application requirements
Current - Reverse Leakage @ Vr: Lower values preferred for reduced standby current
Operating Temperature - Junction: Must encompass application temperature range
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Identical Electrical Specifications): Parts meeting all primary criteria with matching or superior electrical performance at rated conditions.

Category B - Functional Substitutes (Higher Current Rating): Parts exceeding the 10 A current requirement while maintaining 45 V reverse voltage rating, suitable for applications with current margin requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Package	Status
MBR2045CT	onsemi	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	-65°C ~ 175°C	TO-220-3	Obsolete
DSSK20-0045A	IXYS	45 V	10 A	680 mV @ 10 A	300 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
DSSK20-0045B	IXYS	45 V	10 A	510 mV @ 10 A	5 mA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
STPS2045CT	STMicroelectronics	45 V	10 A	570 mV @ 10 A	100 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active
STPS20L45CT	STMicroelectronics	45 V	10 A	550 mV @ 10 A	200 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Obsolete
VS-MBR2045CT-M3	Vishay General Semiconductor - Diodes Division	45 V	10 A	840 mV @ 20 A	100 µA @ 45 V	-65°C ~ 150°C	TO-220-3	Active
MBR2040CT	Diodes Incorporated	40 V	20 A	840 mV @ 20 A	100 µA @ 40 V	-55°C ~ 150°C	TO-220-3	Active
MBR2045CT-BP	Micro Commercial Co	45 V	20 A	Not specified	100 µA @ 45 V	-55°C ~ 150°C	TO-220-3	Active
DSSK28-0045A	IXYS	45 V	15 A	670 mV @ 15 A	500 µA @ 45 V	-55°C ~ 175°C	TO-220-3	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compliance):

STPS2045CT (STMicroelectronics) - Identical electrical specifications to MBR2045CT with active product status and RoHS3 compliance. Suitable for direct replacement in new designs and production.
DSSK20-0045B (IXYS) - Meets all primary electrical criteria with superior forward voltage performance (510 mV @ 10 A). Active status and RoHS3 compliance. Operating temperature range -55°C ~ 150°C requires verification against application requirements.
VS-MBR2045CT-M3 (Vishay General Semiconductor - Diodes Division) - Maintains 45 V / 10 A specifications with active status and RoHS3 compliance. Extended lower temperature rating (-65°C) matches original part. Forward voltage specification provided at 20 A requires application-level verification.

Secondary Substitutes (Higher Current Rating):

MBR2045CT-BP (Micro Commercial Co) - Provides 45 V / 20 A configuration with active status. Suitable for applications requiring current margin above 10 A specification.
DSSK28-0045A (IXYS) - Provides 45 V / 15 A configuration with active status and RoHS3 compliance. Operating temperature range -55°C ~ 175°C. Suitable for applications requiring current margin.

Not Recommended:

STPS20L45CT - Obsolete status eliminates long-term supply viability
MBR2040CT - Reduced reverse voltage rating (40 V) limits application compatibility

Frequently Asked Questions (FAQ)

Q: Can STPS2045CT directly replace MBR2045CT in existing designs?

A: Yes. STPS2045CT matches all critical electrical parameters: 45 V reverse voltage, 10 A average rectified current, 570 mV forward voltage @ 10 A, and TO-220-3 package. Active product status and RoHS3 compliance support production continuity.

Q: What is the difference between DSSK20-0045A and DSSK20-0045B?

A: Both are 45 V / 10 A Schottky diode arrays in TO-220-3 package from IXYS. DSSK20-0045B exhibits superior forward voltage performance (510 mV vs. 680 mV @ 10 A) and lower reverse leakage (5 mA vs. 300 µA @ 45 V). Operating temperature maximum is 150°C for DSSK20-0045B versus 175°C for DSSK20-0045A.

Q: Why is MBR2040CT listed as a substitute if it has 40 V rating instead of 45 V?

A: MBR2040CT is a functional substitute for applications where the actual reverse voltage stress does not exceed 40 V. It provides higher current capability (20 A) and active product status. Application-level voltage analysis is required to confirm compatibility.

Q: Are there differences in thermal performance between substitute parts?

A: Operating temperature ranges vary among substitutes. MBR2045CT and STPS2045CT support -55°C ~ 175°C. DSSK20-0045B and MBR2040CT are limited to -55°C ~ 150°C. VS-MBR2045CT-M3 supports -65°C ~ 150°C. Application thermal requirements must be verified against each part's maximum junction temperature specification.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This diode array contains two independent Schottky diodes sharing a common cathode connection. The configuration is suitable for bridge rectifier applications and dual-diode switching circuits. All listed substitutes maintain this configuration.

Q: Is RoHS compliance a requirement for substitution?

A: RoHS3 compliance is present in all active substitute parts listed. The original MBR2045CT is RoHS non-compliant. For new designs and regulated applications, RoHS3-compliant substitutes are required.

Q: Can higher-current parts like MBR2045CT-BP (20 A) be used in 10 A applications?

A: Yes. Higher current-rated devices operate within specification at lower current levels. MBR2045CT-BP (20 A) is suitable for 10 A applications. Verify forward voltage and reverse leakage specifications meet application requirements.

Q: What is the significance of "Fast Recovery ≤ 500ns, > 200mA (Io)"?

A: This specification indicates switching speed performance. All listed substitutes meet this criterion, confirming suitability for high-frequency rectification and switching applications requiring fast recovery characteristics.

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