MBR3045WT Equivalent & Substitute Parts

Part Overview

The MBR3045WT 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 15 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. The MBR3045WT is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

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 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-247-3	—

Substitute Part Grouping Explanation

Substitute parts for the MBR3045WT are selected based on strict electrical and mechanical parameter compatibility. The following criteria determine substitution eligibility:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode (mandatory match)
Technology: Schottky (mandatory match)
Voltage - DC Reverse (Vr) (Max): 45 V (mandatory match)
Mounting Type: Through Hole (mandatory match)
Package / Case: TO-247-3 (mandatory match)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory match)

Secondary Compatibility Parameters:

Current - Average Rectified (Io) (per Diode): Equal to or greater than 15 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 760 mV @ 30 A
Current - Reverse Leakage @ Vr: Must not exceed 1 mA @ 45 V
Operating Temperature - Junction: Minimum -65°C, maximum 175°C

Substitute parts are classified into three categories:

Direct Equivalents: Parts meeting all primary and secondary criteria with identical electrical performance specifications.

Parametric Equivalents: Parts meeting all primary criteria with secondary parameters within acceptable operational ranges.

Similar Parts: Parts meeting primary criteria with current ratings or temperature ranges that differ from the original specification but remain functionally compatible within defined limits.

Parameter Comparison

Parameter	MBR3045WT (onsemi)	30CPQ045 (SMC)	MBR3045PT-E3/45 (Vishay)	STPS3045CW (STMicroelectronics)	STPS4045CW (STMicroelectronics)	STPS4045CWY (STMicroelectronics)	STPS40L45CW (STMicroelectronics)	VS-MBR3045WT-N3 (Vishay)
Manufacturer	onsemi	SMC Diode Solutions	Vishay General Semiconductor - Diodes Division	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	Vishay General Semiconductor - Diodes Division
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	—	30 A	15 A	20 A	20 A	20 A	15 A
Voltage - Forward (Vf) (Max) @ If	760 mV @ 30 A	540 mV @ 15 A	760 mV @ 30 A	570 mV @ 15 A	760 mV @ 20 A	760 mV @ 20 A	530 mV @ 20 A	760 mV @ 30 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 45 V	1 mA @ 45 V	1 mA @ 45 V	200 µA @ 45 V	200 µA @ 45 V	200 µA @ 45 V	600 µA @ 45 V	1 mA @ 45 V
Operating Temperature - Junction	-65 to 175°C	-55 to 150°C	-65 to 150°C	Max 200°C	Max 175°C	-40 to 175°C	Max 150°C	Not specified
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-3	TO-247-3	TO-3P-3, SC-65-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VS-MBR3045WT-N3 (Vishay General Semiconductor - Diodes Division)

The VS-MBR3045WT-N3 is the primary parametric equivalent for the MBR3045WT. This part maintains identical electrical specifications including 15 A average rectified current, 45 V reverse voltage, and 760 mV forward voltage at 30 A. The device is ROHS3 compliant and carries active product status, ensuring long-term availability. The TO-247-3 package provides direct mechanical compatibility. This part is suitable for direct substitution in applications requiring the original MBR3045WT specifications.

STPS3045CW (STMicroelectronics)

The STPS3045CW is a direct equivalent offering identical 15 A current rating and 45 V reverse voltage in TO-247-3 package. This part features improved reverse leakage characteristics at 200 µA compared to the original 1 mA specification, and a maximum junction temperature of 200°C. ROHS3 compliance and active product status support production continuity. This part is suitable for applications where the original MBR3045WT specifications are required.

STPS4045CW and STPS4045CWY (STMicroelectronics)

Both STPS4045CW and STPS4045CWY are similar parts with 20 A average rectified current, exceeding the original 15 A specification. These devices maintain 45 V reverse voltage and TO-247-3 package compatibility. The STPS4045CWY variant includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 175°C), suitable for automotive applications. Both parts are ROHS3 compliant with active product status. These parts are suitable for applications where higher current capacity is acceptable.

STPS40L45CW (STMicroelectronics)

The STPS40L45CW provides 20 A current rating with improved forward voltage characteristics at 530 mV @ 20 A. This part features reduced reverse leakage at 600 µA and is ROHS3 compliant with active product status. The TO-247-3 package ensures mechanical compatibility. This part is suitable for applications where lower forward voltage drop is beneficial.

MBR3045PT-E3/45 (Vishay General Semiconductor - Diodes Division)

The MBR3045PT-E3/45 offers doubled current capacity at 30 A while maintaining 45 V reverse voltage and identical forward voltage characteristics. This part is ROHS3 compliant with active product status. The package designation TO-3P-3 (SC-65-3) differs from the original TO-247-3, requiring mechanical layout verification. This part is suitable for applications requiring higher current handling with compatible package footprints.

30CPQ045 (SMC Diode Solutions)

The 30CPQ045 maintains 45 V reverse voltage and 1 Pair Common Cathode configuration in TO-247-3 package. This part features improved forward voltage at 540 mV @ 15 A and is ROHS3 compliant with active product status. The operating temperature range (-55°C to 150°C) is narrower than the original specification. This part is suitable for applications within the specified temperature range.

Frequently Asked Questions (FAQ)

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

A: Yes. The VS-MBR3045WT-N3 maintains identical electrical specifications including 15 A average rectified current, 45 V reverse voltage, 760 mV forward voltage at 30 A, and TO-247-3 package configuration. The part is ROHS3 compliant with active product status.

Q: What is the primary difference between STPS3045CW and STPS4045CW?

A: The STPS3045CW is rated for 15 A average rectified current, matching the original MBR3045WT specification. The STPS4045CW is rated for 20 A average rectified current, providing higher current capacity. Both maintain 45 V reverse voltage and TO-247-3 package compatibility.

Q: Is the STPS4045CWY suitable for automotive applications?

A: Yes. The STPS4045CWY carries AEC-Q101 automotive qualification and operates across -40°C to 175°C junction temperature range. This part is suitable for automotive applications requiring 20 A current capacity at 45 V reverse voltage.

Q: Can the MBR3045PT-E3/45 be used in place of the MBR3045WT?

A: The MBR3045PT-E3/45 maintains electrical compatibility with 45 V reverse voltage and identical forward voltage characteristics. However, the package designation differs (TO-3P-3 versus TO-247-3). Mechanical layout verification is required to confirm footprint compatibility before substitution.

Q: What is the significance of the forward voltage difference between STPS40L45CW (530 mV @ 20 A) and the original MBR3045WT (760 mV @ 30 A)?

A: Forward voltage specifications are measured at different current levels. The STPS40L45CW measurement at 20 A indicates lower forward voltage drop at that specific current, which may reduce power dissipation in applications operating at 20 A. Direct comparison requires evaluation at identical current levels.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original MBR3045WT is RoHS non-compliant. Substitution with any listed part ensures compliance with current RoHS3 regulations.

Q: What is the operating temperature range limitation for the 30CPQ045?

A: The 30CPQ045 operates across -55°C to 150°C junction temperature range, which is narrower than the original MBR3045WT range of -65°C to 175°C. This part is suitable for applications within the specified temperature range.

Q: Can parts with higher current ratings (20 A or 30 A) be used in applications designed for 15 A?

A: Yes. Parts with higher current ratings are suitable for applications designed for lower current ratings. The higher rating provides additional design margin and thermal headroom. Electrical specifications including voltage ratings and forward voltage characteristics must remain compatible.

Q: What is the difference between TO-247-3 and TO-247AC package designations?

A: Both designations refer to the same physical TO-247-3 through-hole package. The suffix designations (such as AC) indicate supplier-specific package variants. Mechanical and electrical compatibility is maintained.

Q: Is the STPS3045CW reverse leakage specification of 200 µA better than the original 1 mA?

A: Yes. Lower reverse leakage current indicates reduced leakage at the specified reverse voltage. The STPS3045CW specification of 200 µA @ 45 V represents improved leakage characteristics compared to the original 1 mA @ 45 V specification.

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