MBR4045PT Equivalent & Substitute Parts

Part Overview

The MBR4045PT is a Schottky diode array manufactured by Diodes Incorporated, configured as a 1 Pair Common Cathode with a maximum reverse voltage of 45V and average rectified current of 40A per diode. The component is packaged in TO-3P-3 (SC-65-3) through-hole configuration and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary for ongoing design support and production continuity.

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)	40 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°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-3P-3, SC-65-3
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MBR4045PT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Diode Configuration: 1 Pair Common Cathode (must match)
Technology: Schottky (must match)
Voltage - DC Reverse (Vr) (Max): 45 V (must match or exceed)
Current - Average Rectified (Io) (per Diode): Minimum 40 A (must meet or exceed)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (must match)

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (must match)
Package / Case: TO-3P-3 or equivalent through-hole package

Compliance Requirements:

RoHS Status: ROHS3 Compliant (preferred for new designs)

The substitute parts identified operate at the same 45V reverse voltage and Schottky technology. However, the available active alternatives operate at 20A average rectified current, which is lower than the original 40A specification. These substitutes are suitable for applications where the 40A requirement can be accommodated through parallel configuration or where the actual circuit demand does not require the full 40A rating. All identified substitutes maintain the 1 Pair Common Cathode configuration and fast recovery speed characteristics.

Parameter Comparison

Parameter	MBR4045PT	MBR4045WT	STPS4045CW	STPS4045CWY	STPS40L45CW	VS-40L45CW-N3
Manufacturer	Diodes Incorporated	Vishay General Semiconductor	STMicroelectronics	STMicroelectronics	STMicroelectronics	Vishay General Semiconductor
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
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io) (per Diode)	40 A	20 A	20 A	20 A	20 A	20 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 20 A	590 mV @ 20 A	760 mV @ 20 A	760 mV @ 20 A	530 mV @ 20 A	530 mV @ 20 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)
Current - Reverse Leakage @ Vr	1 mA @ 45 V	1.75 mA @ 45 V	200 µA @ 45 V	200 µA @ 45 V	600 µA @ 45 V	1.5 mA @ 45 V
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	175°C (Max)	-40°C ~ 175°C	150°C (Max)	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-3P-3, SC-65-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247-3
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Active Product Alternatives:

The MBR4045PT is obsolete. All identified substitute parts with active product status are manufactured by STMicroelectronics or Vishay General Semiconductor and are ROHS3 compliant, making them suitable for new designs and ongoing production.

STPS4045CW and STPS4045CWY (STMicroelectronics): Both parts are active, ROHS3 compliant, and maintain the 45V reverse voltage and Schottky technology. STPS4045CWY includes automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40°C ~ 175°C), making it suitable for automotive and high-reliability applications. STPS4045CW operates to 175°C maximum junction temperature. Both are packaged in TO-247-3 and rated for 20A average rectified current.

STPS40L45CW (STMicroelectronics): Active product, ROHS3 compliant, 45V reverse voltage, Schottky technology, TO-247-3 package, 20A average rectified current. Features lower forward voltage (530 mV @ 20 A) compared to STPS4045CW/CWY variants, resulting in reduced power dissipation. Maximum junction temperature is 150°C.

VS-40L45CW-N3 (Vishay General Semiconductor): Active product, ROHS3 compliant, 45V reverse voltage, Schottky technology, TO-247-3 package, 20A average rectified current. Forward voltage specification matches STPS40L45CW (530 mV @ 20 A). Maximum junction temperature is 150°C.

MBR4045WT (Vishay General Semiconductor): Obsolete product, RoHS non-compliant. Not recommended for new designs due to compliance status and obsolete classification.

Current Rating Consideration: All active substitutes are rated for 20A average rectified current, compared to the original 40A specification. Circuit designs requiring the full 40A capacity must implement parallel configuration of substitute devices or conduct thermal and electrical analysis to confirm adequacy at the actual operating current.

Package Transition: Substitutes transition from TO-3P-3 (SC-65-3) to TO-247-3 package. PCB layout and thermal management design must accommodate the different package footprint and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can STPS4045CW, STPS4045CWY, STPS40L45CW, or VS-40L45CW-N3 directly replace MBR4045PT without circuit modification?

A: Direct replacement requires verification of two factors: (1) The circuit's actual operating current demand must not exceed 20A per diode, as all active substitutes are rated for 20A versus the original 40A specification. (2) PCB layout must accommodate the TO-247-3 package transition from the original TO-3P-3 package. Thermal management design must be re-evaluated for the new package.

Q: What is the difference between STPS4045CW and STPS4045CWY?

A: Both parts are electrically identical with 45V reverse voltage, 20A average rectified current, and 760 mV forward voltage @ 20A. STPS4045CWY includes automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40°C ~ 175°C) versus STPS4045CW which operates to 175°C maximum. STPS4045CWY is specified for automotive and high-reliability applications.

Q: How do STPS40L45CW and VS-40L45CW-N3 differ from STPS4045CW?

A: STPS40L45CW and VS-40L45CW-N3 feature lower forward voltage (530 mV @ 20 A) compared to STPS4045CW (760 mV @ 20 A), resulting in reduced power dissipation and heat generation. Both operate to 150°C maximum junction temperature versus 175°C for STPS4045CW. The lower forward voltage makes these parts suitable for applications where thermal management is critical.

Q: Why are all active substitutes rated for 20A instead of 40A?

A: The 40A rating of the original MBR4045PT reflects its specific TO-3P-3 package thermal characteristics. Active substitute parts in TO-247-3 package are rated for 20A based on their thermal design. Applications requiring 40A capacity must implement parallel configuration of two 20A devices or conduct thermal analysis to confirm the actual circuit demand does not exceed 20A per device.

Q: Is MBR4045WT a suitable substitute?

A: MBR4045WT is obsolete and RoHS non-compliant. It is not recommended for new designs. While electrically compatible (45V, 20A, Schottky, 1 Pair Common Cathode), its compliance status and obsolete classification make it unsuitable for production use.

Q: What are the compliance differences between substitute parts?

A: STPS4045CW, STPS4045CWY, STPS40L45CW, and VS-40L45CW-N3 are all ROHS3 compliant and REACH unaffected, making them suitable for new designs and regulated markets. MBR4045WT is RoHS non-compliant and REACH unaffected. The original MBR4045PT is ROHS3 compliant but obsolete.

Q: Can I use STPS4045CWY in non-automotive applications?

A: Yes. STPS4045CWY is automotive-grade qualified (AEC-Q101) but is not restricted to automotive use. Its extended operating temperature range (-40°C ~ 175°C) and higher reliability qualification make it suitable for any application requiring these performance characteristics.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage affects power dissipation and heat generation. STPS40L45CW and VS-40L45CW-N3 (530 mV @ 20 A) dissipate less power than STPS4045CW and STPS4045CWY (760 mV @ 20 A). In high-current applications, the 230 mV difference results in measurable thermal reduction. Circuit thermal design must account for the selected substitute's forward voltage specification.

Q: Are there any temperature range limitations I should consider?

A: The original MBR4045PT operates from -65°C to 150°C. STPS4045CWY extends the upper limit to 175°C and lower limit to -40°C. STPS4045CW, STPS40L45CW, and VS-40L45CW-N3 operate to 150°C maximum. If the application requires operation below -55°C, only the original MBR4045PT specification is met; however, this part is obsolete. Circuit requirements must be evaluated against available substitute temperature ranges.

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