MBR4045WT Equivalent & Substitute Parts

Part Overview

The MBR4045WT 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 20 A per diode. The device is packaged in TO-247-3 through-hole configuration and belongs to the SWITCHMODE™ series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging variants.

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)	20	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Operating Temperature - Junction	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBR4045WT is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Diode configuration: 1 pair common cathode
Technology: Schottky
Maximum reverse voltage (Vr): 45 V
Average rectified current (Io): 20 A per diode
Speed classification: Fast recovery ≤ 500ns, > 200mA (Io)
Mounting type: Through hole
Package type: TO-247-3 (physical compatibility)

Allowable Variations:

Forward voltage (Vf) at 20 A: Substitute parts may vary within the range of 490 mV to 760 mV
Reverse leakage current: Substitute parts may range from 200 µA to 4 mA at 45 V
Operating temperature range: Substitute parts may have different minimum and maximum junction temperatures, provided they support the application's thermal requirements
Packaging designation: TO-247-3, TO-247AC, and TO-247AD are mechanically equivalent
RoHS compliance status: May differ between main part and substitutes
Product status: Active substitutes are preferred over obsolete parts

Substitute parts that do not specify current rating (Io) are excluded from direct substitution consideration.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [mA]	Tj (Operating) [°C]	Package	Product Status	RoHS
MBR4045WT	onsemi	45	20	700 @ 20 A	1 @ 45 V	-65 to 175	TO-247-3	Obsolete	Non-compliant
MBR4045WT	Vishay General Semiconductor	45	20	590 @ 20 A	1.75 @ 45 V	-55 to 150	TO-247-3	Obsolete	Non-compliant
STPS4045CW	STMicroelectronics	45	20	760 @ 20 A	0.2 @ 45 V	-40 to 175	TO-247-3	Active	ROHS3 Compliant
40CPQ045	SMC Diode Solutions	45	20	490 @ 20 A	4 @ 45 V	-55 to 150	TO-247-3	Active	ROHS3 Compliant
MBR6045WT	SMC Diode Solutions	45	Not specified	650 @ 30 A	1 @ 45 V	-55 to 150	TO-247-3	Active	ROHS3 Compliant
STPS4045CWY	STMicroelectronics	45	20	760 @ 20 A	0.2 @ 45 V	-40 to 175	TO-247-3	Active	ROHS3 Compliant
VS-40L45CW-N3	Vishay General Semiconductor	45	20	530 @ 20 A	1.5 @ 45 V	-55 to 150	TO-247-3	Active	ROHS3 Compliant
VS-MBR4045WT-N3	Vishay General Semiconductor	45	20	590 @ 20 A	1.75 @ 45 V	-55 to 150	TO-247-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

STPS4045CW and STPS4045CWY from STMicroelectronics are active production parts with full electrical parameter compatibility. Both maintain 45 V reverse voltage and 20 A average rectified current specifications. STPS4045CWY includes automotive-grade qualification (AEC-Q101) and extended operating temperature range to 175°C maximum, making it suitable for applications requiring automotive reliability. STPS4045CW provides equivalent performance without automotive qualification. Both parts are RoHS3 compliant.

VS-MBR4045WT-N3 from Vishay General Semiconductor is an active production equivalent with identical base part number designation. This part maintains the same electrical specifications as the original onsemi MBR4045WT and is RoHS3 compliant. Operating temperature range is -55°C to 150°C.

Secondary Substitutes (Parameter Variations Within Tolerance):

VS-40L45CW-N3 from Vishay General Semiconductor is an active part with lower forward voltage (530 mV @ 20 A) compared to the original specification (700 mV @ 20 A). This represents improved efficiency characteristics. Reverse leakage current is 1.5 mA at 45 V, within acceptable variation. RoHS3 compliant.

40CPQ045 from SMC Diode Solutions is an active part with the lowest forward voltage specification (490 mV @ 20 A), offering superior efficiency. Reverse leakage current is 4 mA at 45 V, at the upper limit of acceptable variation. RoHS3 compliant. Operating temperature range is -55°C to 150°C.

Not Recommended for Direct Substitution:

MBR6045WT from SMC Diode Solutions does not specify average rectified current (Io) per diode. Forward voltage is specified at 30 A rather than 20 A, preventing direct electrical comparison. This part cannot be confirmed as a direct substitute without additional current rating information.

Compliance Considerations:

The original MBR4045WT is RoHS non-compliant. All active substitute parts listed (STPS4045CW, STPS4045CWY, 40CPQ045, VS-40L45CW-N3, VS-MBR4045WT-N3) are RoHS3 compliant, supporting modern procurement and environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can STPS4045CWY replace MBR4045WT in all applications?

A: STPS4045CWY maintains electrical compatibility across all critical parameters: 45 V reverse voltage, 20 A average rectified current, fast recovery Schottky technology, and TO-247-3 through-hole packaging. The part is RoHS3 compliant and includes automotive-grade qualification (AEC-Q101). Operating temperature range extends to 175°C maximum, matching the original specification. This part is suitable for direct substitution in applications not requiring specific RoHS non-compliant characteristics.

Q: What is the difference between STPS4045CW and STPS4045CWY?

A: Both parts are manufactured by STMicroelectronics with identical electrical specifications: 45 V reverse voltage, 20 A average rectified current, 760 mV forward voltage at 20 A, and 200 µA reverse leakage at 45 V. STPS4045CWY includes automotive-grade qualification (AEC-Q101) and is rated for -40°C to 175°C operating temperature. STPS4045CW is rated for -40°C to 175°C without automotive qualification. Both are RoHS3 compliant and packaged in TO-247-3.

Q: Are TO-247-3, TO-247AC, and TO-247AD packages mechanically interchangeable?

A: Yes. TO-247-3, TO-247AC, and TO-247AD are mechanical variants of the same through-hole package family with identical pin configurations and mounting footprints. Parts specified in any of these package designations are physically compatible in applications designed for TO-247-3 mounting.

Q: Why does MBR6045WT not appear as a recommended substitute?

A: MBR6045WT does not specify average rectified current (Io) per diode. The forward voltage specification is provided at 30 A rather than the required 20 A rating, preventing direct electrical comparison with the MBR4045WT. Without confirmed 20 A current rating, this part cannot be validated as a direct substitute.

Q: What is the significance of forward voltage variation among substitute parts?

A: Forward voltage (Vf) directly affects power dissipation and thermal performance. The original MBR4045WT specifies 700 mV at 20 A. Substitute parts range from 490 mV (40CPQ045) to 760 mV (STPS4045CW/CWY). Lower forward voltage reduces power loss and heat generation, improving efficiency. Higher forward voltage increases power dissipation. Selection depends on thermal design requirements and efficiency targets of the application.

Q: Is RoHS compliance a substitution requirement?

A: RoHS compliance is not a substitution requirement for electrical functionality. However, modern procurement standards and environmental regulations often mandate RoHS-compliant components. The original MBR4045WT is RoHS non-compliant. All active substitute parts listed are RoHS3 compliant, supporting contemporary supply chain and regulatory requirements.

Q: Can VS-40L45CW-N3 be used in high-temperature applications?

A: VS-40L45CW-N3 is rated for maximum junction temperature of 150°C. The original MBR4045WT is rated to 175°C. Applications requiring sustained operation above 150°C should use STPS4045CW or STPS4045CWY, both rated to 175°C maximum junction temperature.

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

A: This configuration indicates the diode array contains two diodes with a shared cathode terminal. All substitute parts maintain this same configuration, ensuring pin-compatible replacement in applications designed for common cathode topology.

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