MBR3045PT Equivalent & Substitute Parts

Part Overview

The MBR3045PT 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 format and operates across a junction temperature range of -65°C to 175°C. The MBR3045PT 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)	15 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-247-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MBR3045PT is determined by the following critical parameters: diode configuration (1 pair common cathode), technology (Schottky), maximum reverse voltage (45 V), average rectified current per diode, package type (TO-247-3), and mounting method (through hole). Substitute parts are grouped into two categories based on current rating compatibility:

Category 1: Direct Current Rating Match (15 A per Diode) Parts with 15 A average rectified current per diode maintain identical current handling capacity to the MBR3045PT. These include DSSK30-0045A, DSSK30-0045B, STPS3045CW, and STPS30L45CW.

Category 2: Higher Current Rating (20 A - 30 A per Diode) Parts with current ratings of 20 A or 30 A per diode provide increased current capacity while maintaining the 45 V reverse voltage specification and TO-247-3 package format. These include STPS4045CWY (20 A), MBR3045PT-E3/45 (30 A), DSSK60-0045B (30 A), and STPS60L45CW (30 A).

Category 3: Voltage or Current Derating Parts with reduced voltage ratings (35 V) or different current specifications are listed for reference but represent design trade-offs: MBR3035PT (35 V, 30 A) and MBR3050PT (50 V, 20 A).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	Package	Temp Range	RoHS Status	Product Status
MBR3045PT	onsemi	45 V	15 A	600 mV @ 20 A	TO-247-3	-65°C ~ 175°C	Non-compliant	Obsolete
DSSK30-0045A	IXYS	45 V	15 A	660 mV @ 15 A	TO-247-3	-55°C ~ 175°C	ROHS3 Compliant	Active
DSSK30-0045B	IXYS	45 V	15 A	470 mV @ 15 A	TO-247-3	-55°C ~ 150°C	ROHS3 Compliant	Active
DSSK60-0045B	IXYS	45 V	30 A	500 mV @ 30 A	TO-247-3	-55°C ~ 150°C	ROHS3 Compliant	Active
MBR3035PT	Solid State Inc.	35 V	30 A	Not specified	TO-247-3	Not specified	ROHS3 Compliant	Active
MBR3045PT-E3/45	Vishay General Semiconductor - Diodes Division	45 V	30 A	760 mV @ 30 A	TO-247-3	-65°C ~ 150°C	ROHS3 Compliant	Active
MBR3050PT	Fairchild Semiconductor	50 V	20 A	750 mV @ 20 A	TO-247-3	-65°C ~ 150°C	ROHS3 Compliant	Active
STPS3045CW	STMicroelectronics	45 V	15 A	570 mV @ 15 A	TO-247-3	-40°C ~ 200°C	ROHS3 Compliant	Active
STPS30L45CW	STMicroelectronics	45 V	15 A	550 mV @ 15 A	TO-247-3	-40°C ~ 150°C	ROHS3 Compliant	Active
STPS4045CWY	STMicroelectronics	45 V	20 A	760 mV @ 20 A	TO-247-3	-40°C ~ 175°C	ROHS3 Compliant	Active
STPS60L45CW	STMicroelectronics	45 V	30 A	550 mV @ 30 A	TO-247-3	-40°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (15 A Current Rating, 45 V Reverse Voltage)

STPS30L45CW (STMicroelectronics) and STPS3045CW (STMicroelectronics) are active, ROHS3-compliant alternatives with identical electrical specifications to the MBR3045PT. STPS30L45CW offers lower forward voltage (550 mV @ 15 A) compared to the original specification (600 mV @ 20 A). DSSK30-0045B (IXYS) provides the lowest forward voltage (470 mV @ 15 A) among 15 A rated options and is ROHS3 compliant, though with a reduced maximum junction temperature of 150°C.

For Increased Current Capacity (20 A - 30 A Current Rating, 45 V Reverse Voltage)

STPS4045CWY (STMicroelectronics, 20 A) maintains the original forward voltage specification (760 mV @ 20 A) and includes automotive qualification (AEC-Q101) with extended temperature range (-40°C to 175°C). STPS60L45CW (STMicroelectronics, 30 A) and MBR3045PT-E3/45 (Vishay, 30 A) provide doubled current capacity while maintaining 45 V reverse voltage rating and ROHS3 compliance. DSSK60-0045B (IXYS, 30 A) is an alternative 30 A option with ROHS3 compliance.

For Voltage Derating Applications

MBR3050PT (Fairchild Semiconductor) provides 50 V reverse voltage with 20 A current rating and ROHS3 compliance for applications requiring higher voltage margin. MBR3035PT (Solid State Inc.) offers 30 A current capacity at reduced 35 V reverse voltage rating with ROHS3 compliance.

All substitute parts maintain Schottky technology, 1 pair common cathode configuration, fast recovery speed (≤ 500ns), and TO-247-3 through-hole packaging. All active substitutes are ROHS3 compliant, addressing the non-compliance status of the obsolete MBR3045PT.

Frequently Asked Questions (FAQ)

Q: Can STPS4045CWY be used as a direct replacement for MBR3045PT?

A: STPS4045CWY is functionally compatible with MBR3045PT in applications where the 20 A current rating (versus 15 A) does not create design constraints. Both devices share identical 45 V reverse voltage, Schottky technology, fast recovery speed, and TO-247-3 packaging. STPS4045CWY is active and ROHS3 compliant, whereas MBR3045PT is obsolete and non-compliant.

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

A: Both IXYS parts maintain 45 V reverse voltage and 15 A current rating in TO-247-3 packaging. DSSK30-0045B features lower forward voltage (470 mV @ 15 A) compared to DSSK30-0045A (660 mV @ 15 A), resulting in reduced power dissipation. DSSK30-0045B has a maximum junction temperature of 150°C, while DSSK30-0045A extends to 175°C.

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

A: All listed substitute parts are packaged in TO-247-3 through-hole format, maintaining mechanical and thermal compatibility with the MBR3045PT. Mounting type is through-hole for all devices, enabling direct board-level substitution without layout modification.

Q: Which substitute offers the lowest forward voltage drop?

A: DSSK30-0045B (IXYS) provides the lowest forward voltage at 470 mV @ 15 A. STPS30L45CW and STPS60L45CW (STMicroelectronics) also offer reduced forward voltage at 550 mV for their respective current ratings.

Q: Can higher current-rated parts (20 A or 30 A) be used in circuits designed for 15 A?

A: Higher current-rated parts are electrically compatible with 15 A circuit designs. The increased current capacity does not create functional incompatibility; the device will operate within its rated specifications. Thermal and PCB layout considerations remain unchanged.

Q: What is the temperature range difference between MBR3045PT and its substitutes?

A: MBR3045PT operates from -65°C to 175°C. Most active substitutes operate from -55°C to 175°C (DSSK30-0045A) or -40°C to 175°C (STPS4045CWY). Some 30 A rated parts have maximum junction temperatures of 150°C. Application temperature requirements determine suitability.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original MBR3045PT is RoHS non-compliant. Compliance status is a primary driver for substitution in new designs and manufacturing environments with RoHS requirements.

Q: Which substitute is recommended for automotive applications?

A: STPS4045CWY (STMicroelectronics) includes automotive qualification per AEC-Q101 standard with operating temperature range of -40°C to 175°C, making it suitable for automotive circuit requirements.

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