MBR3045WTG Equivalent & Substitute Parts

Part Overview

The MBR3045WTG is a Schottky diode array manufactured by onsemi in the SWITCHMODE™ series. This component features a 1 Pair Common Cathode configuration with a maximum reverse voltage of 45 V and an average rectified current of 15 A per diode. The device is packaged in a TO-247-3 through-hole format and operates across a junction temperature range of -65°C to 175°C.

The MBR3045WTG is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

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	760 mV @ 30 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	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBR3045WTG is determined by the following critical parameters:

Mandatory Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V
Mounting Type: Through Hole
Package / Case: TO-247-3

Current Rating Considerations: Substitute parts are grouped by average rectified current capacity. The MBR3045WTG operates at 15 A per diode. Substitutes with equal or higher current ratings (15 A, 30 A, or 40 A) are electrically compatible, as they can handle the specified load without exceeding design limits.

Forward Voltage Characteristics: Forward voltage drop varies across substitute options. Parts with lower forward voltage (Vf) values provide improved efficiency, while parts with higher Vf values remain functionally compatible within the 45 V reverse voltage specification.

Temperature Range: The MBR3045WTG operates from -65°C to 175°C. Substitute parts with operating ranges of -55°C to 175°C or -55°C to 150°C are compatible for applications within the -55°C to 150°C overlap window.

Compliance and Status: All listed substitutes are ROHS3 compliant and REACH unaffected. Active product status indicates ongoing manufacturer support and availability.

Parameter Comparison

Part Number	Manufacturer	Status	Io (A)	Vf (Max) @ If	Vr (Max)	Temp Range (°C)	Package
MBR3045WTG	onsemi	Obsolete	15	760 mV @ 30 A	45 V	-65 ~ 175	TO-247-3
DSA30C45HB	IXYS	Active	15	740 mV @ 15 A	45 V	-55 ~ 175	TO-247-3
DSA60C45HB	IXYS	Active	30	770 mV @ 30 A	45 V	-55 ~ 175	TO-247-3
DSA80C45HB	IXYS	Active	40	780 mV @ 40 A	45 V	-55 ~ 175	TO-247-3
DSB30C45HB	IXYS	Active	15	580 mV @ 15 A	45 V	-55 ~ 175	TO-247-3
DSB60C45HB	IXYS	Active	30	620 mV @ 30 A	45 V	-55 ~ 150	TO-247-3
DSB80C45HB	IXYS	Active	40	620 mV @ 40 A	45 V	-55 ~ 150	TO-247-3
DSSK60-0045A	IXYS	Active	30	690 mV @ 30 A	45 V	-55 ~ 175	TO-247-3
DSSK60-0045B	IXYS	Active	30	500 mV @ 30 A	45 V	-55 ~ 150	TO-247-3
DSSK80-0045B	IXYS	Active	40	510 mV @ 40 A	45 V	-55 ~ 150	TO-247-3
MBR3045PT-E3/45	Vishay General Semiconductor - Diodes Division	Active	30	760 mV @ 30 A	45 V	-65 ~ 150	TO-247-3

Engineering Selection Recommendations

Direct Replacement (15 A Current Rating): DSA30C45HB and DSB30C45HB are direct current-rated equivalents to the MBR3045WTG. Both are active products with ROHS3 compliance. DSA30C45HB maintains a forward voltage of 740 mV at 15 A, while DSB30C45HB offers a lower forward voltage of 580 mV at 15 A, providing improved efficiency characteristics.

Higher Current Capacity Substitutes (30 A and 40 A Ratings): DSA60C45HB, DSA80C45HB, DSB60C45HB, DSB80C45HB, DSSK60-0045A, DSSK60-0045B, DSSK80-0045B, and MBR3045PT-E3/45 are electrically compatible substitutes with increased current handling capacity. These parts maintain the 45 V reverse voltage specification and TO-247-3 package format. Selection among these options depends on application current requirements and thermal management considerations.

Temperature Range Compatibility: Applications requiring operation below -55°C must use MBR3045WTG or MBR3045PT-E3/45, as these are the only options with -65°C minimum junction temperature. All other substitutes operate from -55°C minimum.

Product Status and Availability: All substitute parts listed are active products with confirmed inventory availability. The MBR3045WTG is obsolete; transition to an active equivalent is recommended for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can DSA30C45HB directly replace MBR3045WTG in existing designs?

A: Yes. DSA30C45HB matches the MBR3045WTG in diode configuration, reverse voltage rating, current capacity, and TO-247-3 package. Both are Schottky technology with fast recovery characteristics. The forward voltage is slightly lower (740 mV vs. 760 mV), which improves efficiency. Operating temperature range differs at the lower end (-55°C vs. -65°C minimum), which is compatible for most applications.

Q: What is the difference between DSA and DSB series parts?

A: Both DSA and DSB series are IXYS Schottky diode arrays with identical voltage and current ratings. The primary difference is forward voltage characteristics. DSB series parts exhibit lower forward voltage drops (580 mV to 620 mV) compared to DSA series (740 mV to 780 mV), resulting in reduced power dissipation and improved thermal performance.

Q: Can I use a 30 A or 40 A rated part in place of the 15 A MBR3045WTG?

A: Yes. Higher current-rated parts are electrically compatible substitutes. A 30 A or 40 A rated diode array can safely handle 15 A operation. The higher current rating provides design margin and does not introduce incompatibility. Package and voltage specifications remain identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the MBR3045WTG.

Q: What is the significance of forward voltage differences among substitutes?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. Lower Vf values reduce power dissipation and heat generation. For example, DSSK60-0045B and DSSK80-0045B exhibit Vf values of 500 mV and 510 mV respectively, compared to 760 mV for the MBR3045WTG. This difference is significant in high-current applications where thermal management is critical.

Q: Does the TO-247-3 package differ among manufacturers?

A: The TO-247-3 package specification is standardized across manufacturers. All listed parts use TO-247-3 or equivalent designations (TO-247AD, TO-3P-3, SC-65-3). Physical dimensions and pin configurations are compatible for direct board-level substitution.

Q: Which substitute offers the best thermal performance?

A: DSSK60-0045B and DSSK80-0045B offer the lowest forward voltage characteristics (500 mV and 510 mV respectively), resulting in minimal power dissipation and superior thermal performance compared to other options.

Q: Can I use MBR3045PT-E3/45 as a substitute?

A: Yes. MBR3045PT-E3/45 is manufactured by Vishay and is an active product. It matches the MBR3045WTG in voltage rating, package type, and diode configuration. The current rating is 30 A, providing design margin above the 15 A requirement. Operating temperature range is -65°C to 150°C, which covers the -65°C to 150°C overlap with the original part.

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