MBR3045WT Equivalent & Substitute Parts

Part Overview

The MBR3045WT is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode with 45 V reverse voltage rating and 15 A average rectified current per diode. The device is packaged in TO-247-3 through-hole format and features fast recovery characteristics suitable for high-frequency rectification applications.

The MBR3045WT is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain electrical and mechanical compatibility or provide enhanced performance characteristics within the same package family.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 30 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR3045WT is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Mounting Type: Through Hole
Package / Case: TO-247-3

Performance Parameters (Allow Variation):

Current - Average Rectified (Io): Equal to or greater than 15 A per diode
Voltage - Forward (Vf): Lower values indicate improved efficiency
Current - Reverse Leakage: Lower values indicate improved performance
Operating Temperature Range: Extended ranges provide design margin

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts maintaining 45 V reverse voltage and 15 A current ratings with identical configuration and package.

Enhanced Performance Substitutes: Parts maintaining 45 V reverse voltage with higher current ratings (20 A, 30 A) or improved forward voltage characteristics, suitable for applications with higher current demands or efficiency requirements.

Voltage-Reduced Substitutes: Parts with lower reverse voltage ratings (35 V) suitable only for applications where the lower voltage specification is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io per Diode [A]	Vf (Max) [mV]	Reverse Leakage [µA/mA]	Tj (Max) [°C]	Product Status	RoHS Status
MBR3045WT	Vishay	45	15	760 @ 30 A	1 mA @ 45 V	150	Obsolete	Non-compliant
VS-MBR3045WT-N3	Vishay	45	15	760 @ 30 A	1 mA @ 45 V	150	Active	ROHS3 Compliant
STPS3045CW	STMicroelectronics	45	15	570 @ 15 A	200 µA @ 45 V	200	Active	ROHS3 Compliant
STPS30L45CW	STMicroelectronics	45	15	550 @ 15 A	400 µA @ 45 V	150	Active	ROHS3 Compliant
STPS4045CWY	STMicroelectronics	45	20	760 @ 20 A	200 µA @ 45 V	175	Active	ROHS3 Compliant
STPS60L45CW	STMicroelectronics	45	30	550 @ 30 A	1.5 mA @ 45 V	150	Active	ROHS3 Compliant
DSSK60-0045A	IXYS	45	30	690 @ 30 A	1 mA @ 45 V	175	Active	ROHS3 Compliant
MBR3035PT	Solid State Inc.	35	30	—	—	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

VS-MBR3045WT-N3 is the direct equivalent to MBR3045WT. This part maintains identical electrical specifications (45 V, 15 A, 760 mV forward voltage) and mechanical compatibility. The primary advantage is active product status and ROHS3 compliance, addressing regulatory requirements for new designs. This part is recommended for direct substitution in existing applications.

Secondary Equivalents (Electrical Compatibility with Enhanced Performance):

STPS3045CW and STPS30L45CW maintain the 45 V reverse voltage and 15 A current ratings required for MBR3045WT compatibility. Both parts are active products with ROHS3 compliance. STPS3045CW offers improved forward voltage characteristics (570 mV @ 15 A) and extended maximum junction temperature (200°C). STPS30L45CW provides lower forward voltage (550 mV @ 15 A) with standard junction temperature rating (150°C). These parts are suitable for applications where improved efficiency or thermal performance is beneficial.

Higher Current Capacity Substitutes:

STPS4045CWY, STPS60L45CW, and DSSK60-0045A maintain 45 V reverse voltage with increased current ratings (20 A and 30 A respectively). These parts are suitable for applications requiring higher current capacity than the original 15 A specification. All three are active products with ROHS3 compliance. STPS4045CWY includes automotive qualification (AEC-Q101). STPS60L45CW and DSSK60-0045A support 30 A operation with extended junction temperature ratings (175°C).

Voltage-Reduced Substitute:

MBR3035PT operates at 35 V reverse voltage with 30 A current capacity. This part is suitable only for applications where the lower voltage specification meets design requirements. Use of this part in circuits designed for 45 V operation is not appropriate.

Compliance Considerations:

The MBR3045WT is RoHS non-compliant. All recommended substitute parts (VS-MBR3045WT-N3, STPS3045CW, STPS30L45CW, STPS4045CWY, STPS60L45CW, DSSK60-0045A) are ROHS3 compliant, supporting regulatory compliance for new designs and manufacturing.

Frequently Asked Questions (FAQ)

Q: Can VS-MBR3045WT-N3 be used as a direct replacement for MBR3045WT?

A: Yes. VS-MBR3045WT-N3 maintains identical electrical specifications (45 V reverse voltage, 15 A average rectified current, 760 mV forward voltage) and mechanical compatibility (TO-247-3 through-hole package). The part is pin-compatible and functionally equivalent. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What is the difference between STPS3045CW and STPS30L45CW?

A: Both parts maintain 45 V reverse voltage and 15 A current ratings. STPS3045CW features 570 mV forward voltage at 15 A with maximum junction temperature of 200°C. STPS30L45CW features 550 mV forward voltage at 15 A with maximum junction temperature of 150°C. STPS30L45CW provides lower forward voltage (improved efficiency) while STPS3045CW provides higher temperature capability.

Q: Can STPS4045CWY be used in place of MBR3045WT?

A: Yes, with design consideration. STPS4045CWY maintains 45 V reverse voltage and exceeds the 15 A current requirement with 20 A capacity. The part is pin-compatible in TO-247-3 package. Forward voltage is identical (760 mV @ 20 A). The higher current rating provides design margin for applications with variable load conditions. STPS4045CWY includes automotive qualification (AEC-Q101).

Q: What are the advantages of STPS60L45CW or DSSK60-0045A over the original MBR3045WT?

A: Both parts maintain 45 V reverse voltage with doubled current capacity (30 A versus 15 A). STPS60L45CW offers significantly lower forward voltage (550 mV @ 30 A versus 760 mV @ 30 A), reducing power dissipation and improving efficiency. DSSK60-0045A provides 690 mV forward voltage with extended junction temperature (175°C). These parts are suitable for applications requiring higher current handling or improved thermal performance.

Q: Is MBR3035PT suitable as a substitute for MBR3045WT?

A: MBR3035PT is not recommended as a substitute for MBR3045WT in applications designed for 45 V operation. The part operates at 35 V reverse voltage, which is 10 V lower than the original specification. Use of this part in 45 V circuits creates risk of device failure. MBR3035PT is suitable only for applications where the lower voltage specification is acceptable and verified by circuit analysis.

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

A: Yes. All substitute parts listed maintain TO-247-3 through-hole package compatibility. Mechanical mounting and thermal characteristics are consistent across all parts. Pin configuration (1 Pair Common Cathode) is identical, ensuring direct board-level compatibility.

Q: What is the significance of RoHS compliance for substitute part selection?

A: The MBR3045WT is RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, meeting regulatory requirements for new product designs and manufacturing in regions with RoHS directives. For new designs or manufacturing transitions, ROHS3-compliant parts are required. For legacy system maintenance, RoHS status may not be a constraint.

Q: Can substitute parts be mixed in the same circuit?

A: Mixing different substitute parts in the same circuit is not recommended. Variations in forward voltage, reverse leakage, and thermal characteristics between different manufacturers and part numbers can create unbalanced current distribution and thermal stress. Use a single part number throughout the circuit for consistent performance and reliability.

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