MBR4045PT Equivalent & Substitute Parts

Part Overview

The MBR4045PT 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 housed in a TO-247-3 through-hole package and features fast recovery characteristics suitable for switching applications. The MBR4045PT is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

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)	20 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction	-65°C ~ 150°C
Mounting Type	Through Hole
Package / Case	TO-247-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBR4045PT is determined by the following critical parameters: diode configuration (1 pair common cathode), technology (Schottky), reverse voltage rating (45 V maximum), average rectified current per diode (20 A), package type (TO-247-3 through-hole), and fast recovery speed characteristics (≤ 500 ns). Substitute parts are grouped into three categories based on current rating and voltage rating compatibility:

Category 1: Direct Current and Voltage Match (45 V, 20 A) Parts with identical 45 V reverse voltage and 20 A current ratings provide direct functional equivalence with minimal circuit redesign.

Category 2: Higher Current Rating at Same Voltage (45 V, > 20 A) Parts rated for 45 V reverse voltage with current ratings exceeding 20 A (30 A or 40 A) function as direct substitutes with improved current handling capability.

Category 3: Higher Voltage Rating at Same or Higher Current (> 45 V, ≥ 20 A) Parts with reverse voltage ratings above 45 V maintain backward compatibility in circuits designed for 45 V operation while providing additional voltage margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package	Product Status	RoHS Status
MBR4045PT	onsemi	45 V	20 A	700 mV @ 20 A	TO-247-3	Obsolete	Non-compliant
STPS4045CWY	STMicroelectronics	45 V	20 A	760 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant
DSSK30-0045A	IXYS	45 V	15 A	660 mV @ 15 A	TO-247-3	Active	ROHS3 Compliant
DSSK30-0045B	IXYS	45 V	15 A	470 mV @ 15 A	TO-247-3	Active	ROHS3 Compliant
DSSK60-0045A	IXYS	45 V	30 A	690 mV @ 30 A	TO-247-3	Active	ROHS3 Compliant
DSSK60-0045B	IXYS	45 V	30 A	500 mV @ 30 A	TO-247-3	Active	ROHS3 Compliant
DSSK80-0045B	IXYS	45 V	40 A	510 mV @ 40 A	TO-247-3	Active	ROHS3 Compliant
MBR40H45PT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	40 A	730 mV @ 40 A	TO-247-3	Active	ROHS3 Compliant
DSSK40-006B	IXYS	60 V	20 A	530 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant
DSSK70-008A	IXYS	80 V	35 A	770 mV @ 35 A	TO-247-3	Active	ROHS3 Compliant
MBR4050PT-E3/45	Vishay General Semiconductor - Diodes Division	50 V	40 A	720 mV @ 20 A	TO-247-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: STPS4045CWY

The STPS4045CWY from STMicroelectronics provides direct electrical equivalence to the MBR4045PT with identical 45 V reverse voltage and 20 A current ratings in the same TO-247-3 package. This part is active in production status and ROHS3 compliant, addressing the obsolescence of the original component. The STPS4045CWY carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Secondary Substitutes for Higher Current Applications: DSSK60-0045A, DSSK60-0045B, DSSK80-0045B, MBR40H45PT-E3/45

These parts maintain the 45 V reverse voltage rating while providing current ratings of 30 A or 40 A, enabling use in circuits requiring higher current capacity without voltage derating. All are active in production and ROHS3 compliant.

Substitutes for Higher Voltage Applications: DSSK40-006B, DSSK70-008A, MBR4050PT-E3/45

These parts provide reverse voltage ratings above 45 V (50 V, 60 V, or 80 V) while maintaining or exceeding the 20 A current requirement. These options are suitable for circuits where additional voltage margin is required. All are active in production and ROHS3 compliant.

Lower Current Alternative: DSSK30-0045A, DSSK30-0045B

These parts are rated for 45 V reverse voltage with 15 A current per diode. These options are suitable only for applications where the circuit current requirement does not exceed 15 A per diode. Both are active in production and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can STPS4045CWY directly replace MBR4045PT without circuit modification?

A: Yes. The STPS4045CWY provides identical electrical specifications: 45 V reverse voltage, 20 A average rectified current per diode, 1 pair common cathode configuration, and TO-247-3 package. Direct substitution is supported without circuit redesign.

Q: What is the advantage of using DSSK60-0045A or DSSK80-0045B over STPS4045CWY?

A: DSSK60-0045A and DSSK80-0045B provide higher current ratings (30 A and 40 A respectively) at the same 45 V reverse voltage. These parts are selected when circuit current requirements exceed 20 A per diode, providing improved thermal performance and reduced forward voltage drop at higher currents.

Q: Are higher voltage-rated parts such as DSSK40-006B (60 V) backward compatible with MBR4045PT (45 V) circuits?

A: Yes. Parts with higher reverse voltage ratings operate in circuits designed for lower voltages. The DSSK40-006B rated for 60 V functions in 45 V applications with additional voltage margin. This approach is used when circuit voltage stress margins require enhancement.

Q: What is the difference between DSSK30-0045A and DSSK30-0045B?

A: Both parts are rated for 45 V reverse voltage and 15 A current per diode in TO-247-3 packages. The primary difference is forward voltage: DSSK30-0045A exhibits 660 mV at 15 A, while DSSK30-0045B exhibits 470 mV at 15 A. DSSK30-0045B provides lower forward voltage drop, reducing power dissipation in applications operating at 15 A or below.

Q: Why is MBR4045PT classified as obsolete?

A: The MBR4045PT is no longer in active production. Active alternatives such as STPS4045CWY, MBR40H45PT-E3/45, and DSSK series parts provide equivalent or superior performance with current manufacturing support and compliance certifications.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original MBR4045PT is RoHS non-compliant. Selection of ROHS3 compliant alternatives ensures compliance with current environmental and regulatory requirements.

Q: What package options are available for substitutes?

A: All substitute parts listed are housed in TO-247-3 through-hole packages, maintaining mechanical and thermal compatibility with the original MBR4045PT footprint. Package designation may vary by manufacturer (TO-247-3, TO-247AD, TO-3P-3, SC-65-3) but all reference the same physical form factor.

Q: Can MBR4050PT-E3/45 (50 V, 40 A) be used in place of MBR4045PT (45 V, 20 A)?

A: Yes. The MBR4050PT-E3/45 provides higher voltage (50 V) and current (40 A) ratings, functioning as a substitute with enhanced performance margins. This part is suitable for applications where additional voltage and current headroom is beneficial.

Q: What is the operating temperature range difference between MBR4045PT and STPS4045CWY?

A: MBR4045PT operates from -65°C to 150°C junction temperature. STPS4045CWY operates from -40°C to 175°C. The STPS4045CWY provides extended high-temperature operation to 175°C, beneficial for high-temperature applications.

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