MBR6045WT Equivalent & Substitute Parts

Part Overview

The MBR6045WT 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 30 A per diode. The device is packaged in TO-247-3 through-hole configuration and operates across a junction temperature range of -65°C to 175°C. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity. The MBR6045WT belongs to the SWITCHMODE™ series and is RoHS non-compliant.

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)	30 A
Voltage - Forward (Vf) (Max) @ If	620 mV @ 30 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-247-3

Substitute Part Grouping Explanation

Substitution of the MBR6045WT is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io) (per Diode): 30 A (or higher)
Mounting Type: Through Hole
Package / Case: TO-247-3

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed 650 mV @ 30 A for direct substitution
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 30 mA @ 45 V

Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Equivalents: Parts with identical part numbers from different manufacturers or packaging variants that maintain all electrical specifications.

Similar Substitutes: Parts with matching core electrical parameters (45 V, 30 A minimum, Schottky, Common Cathode) and compatible thermal ratings.

Parametric Equivalents: Parts with identical electrical performance characteristics and forward voltage specifications, suitable for direct circuit replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Reverse Leakage @ Vr	Tj (Operating)	Product Status	RoHS Status
MBR6045WT	onsemi	45 V	30 A	620 mV @ 30 A	1 mA @ 45 V	-65°C ~ 175°C	Obsolete	Non-compliant
MBR6045WT	SMC Diode Solutions	45 V	—	650 mV @ 30 A	1 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS6045CW	STMicroelectronics	45 V	30 A	630 mV @ 30 A	500 µA @ 45 V	-40°C ~ 175°C	Active	ROHS3 Compliant
DSSK60-0045A	IXYS	45 V	30 A	690 mV @ 30 A	1 mA @ 45 V	-55°C ~ 175°C	Active	ROHS3 Compliant
DSSK80-0045B	IXYS	45 V	40 A	510 mV @ 40 A	30 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant
MBR6045PTHC0G	Taiwan Semiconductor Corporation	45 V	60 A	820 mV @ 60 A	1 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS4045CWY	STMicroelectronics	45 V	20 A	760 mV @ 20 A	200 µA @ 45 V	-40°C ~ 175°C	Active	ROHS3 Compliant
DSB60C45HB	IXYS	45 V	30 A	620 mV @ 30 A	10 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant
VS-MBR6045WT-N3	Vishay General Semiconductor - Diodes Division	45 V	30 A	620 mV @ 30 A	1 mA @ 45 V	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

The VS-MBR6045WT-N3 from Vishay General Semiconductor - Diodes Division provides the closest electrical match to the obsolete MBR6045WT. This part maintains identical forward voltage specifications (620 mV @ 30 A), reverse voltage (45 V), and current rating (30 A). The part is currently active and ROHS3 compliant, addressing regulatory requirements. Operating temperature range is -55°C to 150°C, which is narrower than the original but suitable for most applications within this window.

The DSB60C45HB from IXYS offers identical forward voltage performance (620 mV @ 30 A) and is actively produced with ROHS3 compliance. This part is suitable for applications where the original specifications are critical.

Active Production Alternatives (Electrical Equivalence):

The STPS6045CW from STMicroelectronics matches the 45 V / 30 A specifications with forward voltage of 630 mV @ 30 A and is ROHS3 compliant. This part features lower reverse leakage (500 µA @ 45 V) compared to the original (1 mA @ 45 V) and extends the maximum junction temperature to 175°C.

The DSSK60-0045A from IXYS maintains 45 V / 30 A ratings with forward voltage of 690 mV @ 30 A. This part supports the full temperature range of -55°C to 175°C and is ROHS3 compliant.

Higher Current Capability (Design Upgrade):

The DSSK80-0045B from IXYS provides 40 A current capability at 45 V reverse voltage, offering increased design margin. Forward voltage is 510 mV @ 40 A, representing improved efficiency. This part is ROHS3 compliant and suitable for applications requiring higher current capacity.

The MBR6045PTHC0G from Taiwan Semiconductor Corporation offers 60 A capability at 45 V with AEC-Q101 automotive qualification. This part is ROHS3 compliant and suitable for automotive applications requiring higher current ratings.

Lower Current Requirement (Cost Optimization):

The STPS4045CWY from STMicroelectronics is rated for 20 A at 45 V and includes AEC-Q101 automotive qualification. This part is suitable for applications where 30 A capacity exceeds requirements. Forward voltage is 760 mV @ 20 A, and the part is ROHS3 compliant.

Regulatory Compliance:

All recommended active substitutes are ROHS3 compliant, addressing environmental and regulatory requirements. The original MBR6045WT is RoHS non-compliant; substitution with any active alternative improves regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can the VS-MBR6045WT-N3 directly replace the obsolete MBR6045WT?

A: Yes. The VS-MBR6045WT-N3 maintains identical electrical specifications: 45 V reverse voltage, 30 A average rectified current per diode, and 620 mV forward voltage @ 30 A. Both devices use Schottky technology with 1 Pair Common Cathode configuration in TO-247-3 packaging. The operating temperature range is narrower (-55°C to 150°C versus -65°C to 175°C), which is acceptable for most applications. The part is currently in active production with ROHS3 compliance.

Q: What is the difference between the MBR6045WT from onsemi and the MBR6045WT from SMC Diode Solutions?

A: Both parts share the same part number and maintain 45 V reverse voltage and 1 Pair Common Cathode configuration in TO-247-3 packaging. The SMC Diode Solutions version specifies 650 mV forward voltage @ 30 A (versus 620 mV for onsemi), operates across -55°C to 150°C (versus -65°C to 175°C), and is ROHS3 compliant. The SMC version is currently in active production.

Q: Is the STPS6045CW suitable for applications requiring the full -65°C to 175°C temperature range?

A: The STPS6045CW operates from -40°C to 175°C, which does not cover the lower temperature extreme of -65°C. If operation below -40°C is required, the DSSK60-0045A (-55°C to 175°C) or MBR6045PTHC0G (-55°C to 175°C) are more appropriate selections.

Q: Can I use the DSSK80-0045B (40 A) as a substitute for the 30 A MBR6045WT?

A: Yes. The DSSK80-0045B maintains the 45 V reverse voltage and Schottky technology with 1 Pair Common Cathode configuration. The higher 40 A current rating provides design margin and does not create incompatibility. Forward voltage is 510 mV @ 40 A, which is lower than the original, improving efficiency. Operating temperature is -55°C to 150°C. This part is ROHS3 compliant.

Q: What is the significance of reverse leakage current differences among substitutes?

A: Reverse leakage current affects power dissipation and thermal performance at maximum reverse voltage. The original MBR6045WT specifies 1 mA @ 45 V. The STPS6045CW offers lower leakage at 500 µA @ 45 V, reducing standby power consumption. The DSSK80-0045B specifies 30 mA @ 45 V, which is higher and may increase thermal load in applications with sustained reverse bias. Selection depends on application requirements for power efficiency and thermal management.

Q: Are all substitute parts available in the same TO-247-3 package?

A: Yes. All substitute parts listed are mounted in TO-247-3 through-hole configuration. Supplier device package designations vary (TO-247-3, TO-247AD, TO-247AC), but these represent equivalent mechanical and electrical interfaces suitable for the same PCB footprint and mounting hardware.

Q: Which substitute offers the best forward voltage performance?

A: The DSSK80-0045B offers the lowest forward voltage at 510 mV @ 40 A, providing the highest efficiency. For 30 A operation, the MBR6045WT (onsemi), DSB60C45HB, and VS-MBR6045WT-N3 all specify 620 mV @ 30 A. The STPS6045CW specifies 630 mV @ 30 A, and the DSSK60-0045A specifies 690 mV @ 30 A.

Q: Is automotive qualification required for my application?

A: Two substitutes include AEC-Q101 automotive qualification: STPS4045CWY (20 A) and MBR6045PTHC0G (60 A). If automotive qualification is mandatory, these parts are appropriate selections. Other substitutes do not carry automotive qualification but are suitable for industrial and commercial applications.

Q: What is the difference between "Direct Manufacturer Equivalent," "Similar Substitute," and "Parametric Equivalent" classifications?

A: Direct Manufacturer Equivalents share identical part numbers across manufacturers or packaging variants with maintained electrical specifications. Similar Substitutes match core electrical parameters (45 V, 30 A minimum, Schottky, Common Cathode) with compatible thermal ratings. Parametric Equivalents demonstrate identical electrical performance characteristics and forward voltage specifications, suitable for direct circuit replacement. All three categories are electrically compatible with the original MBR6045WT within specified operating conditions.

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