MBR1045 Equivalent & Substitute Parts

Part Overview

The MBR1045 is a Schottky rectifier diode rated for 45 V DC reverse voltage and 10 A average rectified current in a Through Hole TO-220-2 package. The original onsemi MBR1045 is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Active alternatives from multiple manufacturers provide functional equivalence while maintaining the same electrical ratings and mechanical form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	10	A
Technology	Schottky	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction	-65 to 175	°C

Substitute Part Grouping Explanation

Substitution of the MBR1045 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 10 A minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: TO-220-2

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower values indicate improved efficiency
Current - Reverse Leakage @ Vr: Lower values indicate better performance
Operating Temperature - Junction: Must accommodate application requirements
Product Status: Active parts are preferred over obsolete classifications
RoHS Compliance: ROHS3 Compliant parts meet current regulatory requirements

Parts are grouped as Direct Equivalents (identical electrical and mechanical specifications), Similar Parts (meet core substitution criteria with minor parameter variations), and Alternative Parts (meet minimum requirements with notable parameter differences).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Tj (Max) [°C]	Product Status	RoHS Status
MBR1045	onsemi	45	10	840 @ 20 A	100 @ 45 V	175	Obsolete	RoHS non-compliant
MBR1045G	onsemi	45	10	840 @ 20 A	100 @ 45 V	175	Active	ROHS3 Compliant
MBR1045	Taiwan Semiconductor Corporation	45	10	700 @ 10 A	100 @ 45 V	150	Active	ROHS3 Compliant
MBR1045-E3/45	Vishay General Semiconductor - Diodes Division	45	10	570 @ 10 A	100 @ 45 V	150	Active	ROHS3 Compliant
DSS10-0045B	IXYS	45	10	510 @ 10 A	5 @ 45 V	150	Active	ROHS3 Compliant
MBR1040-BP	Micro Commercial Co	40	10	—	100 @ 40 V	150	Active	—
MBR1040F-BP	Micro Commercial Co	40	10	550 @ 10 A	500 @ 40 V	150	Active	—
MBR1045-BP	Micro Commercial Co	45	10	—	100 @ 45 V	150	Active	—
STPS1045D	STMicroelectronics	45	10	600 @ 10 A	100 @ 45 V	175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Obsolete Part Replacement):

MBR1045G (onsemi) is the direct successor to the obsolete MBR1045. It maintains identical electrical specifications (45 V, 10 A, 840 mV forward voltage) and maximum junction temperature (175°C). The part is Active and ROHS3 Compliant, making it the primary choice for direct substitution in existing designs.

Active Alternatives with Improved Performance:

MBR1045-E3/45 (Vishay) and STPS1045D (STMicroelectronics) both meet the 45 V / 10 A core requirements and are Active with ROHS3 Compliance. These parts feature lower forward voltage characteristics (570 mV and 600 mV respectively at 10 A) compared to the original specification, resulting in reduced power dissipation. STPS1045D maintains the 175°C maximum junction temperature of the original part.

Alternative with Superior Leakage Performance:

DSS10-0045B (IXYS) meets all core electrical requirements (45 V, 10 A) and is Active with ROHS3 Compliance. This part exhibits significantly lower reverse leakage current (5 µA at 45 V versus 100 µA), which may be advantageous in applications sensitive to leakage performance.

Lower Voltage Alternatives:

MBR1040-BP and MBR1040F-BP (Micro Commercial Co) are rated for 40 V maximum reverse voltage. These parts are suitable only for applications where the circuit design operates below 40 V. MBR1040F-BP provides forward voltage specification (550 mV at 10 A) and is Active.

Compliance Considerations:

All recommended Active alternatives carry ROHS3 Compliance certification. The original onsemi MBR1045 is RoHS non-compliant; designs requiring RoHS compliance must transition to an Active equivalent.

Frequently Asked Questions (FAQ)

Q: Can MBR1045G directly replace the obsolete onsemi MBR1045?

A: Yes. MBR1045G is the Active equivalent from onsemi with identical electrical ratings (45 V, 10 A, 840 mV forward voltage) and maximum junction temperature (175°C). It is the recommended direct replacement.

Q: What is the difference between MBR1045-E3/45 and the original MBR1045?

A: MBR1045-E3/45 meets the same voltage and current ratings (45 V, 10 A) but features lower forward voltage (570 mV at 10 A versus 840 mV at 20 A in the original). The maximum junction temperature is 150°C versus 175°C. Both are Schottky diodes in TO-220-2 packages.

Q: Can I use MBR1040-BP or MBR1040F-BP as substitutes?

A: MBR1040-BP and MBR1040F-BP are rated for 40 V maximum reverse voltage, compared to 45 V for the MBR1045. These parts are suitable only if your circuit design operates at or below 40 V. They are not direct substitutes for 45 V applications.

Q: What are the packaging differences between these parts?

A: All substitute parts use the Through Hole TO-220-2 package, maintaining mechanical compatibility with the original MBR1045. Packaging variations include Tube (MBR1045G, MBR1045-E3/45, DSS10-0045B, STPS1045D) and Bulk (MBR1040-BP, MBR1040F-BP, MBR1045-BP) configurations, which affect procurement and handling but not electrical performance.

Q: Which substitute offers the best forward voltage performance?

A: DSS10-0045B (IXYS) provides the lowest forward voltage at 510 mV at 10 A, followed by MBR1045-E3/45 at 570 mV at 10 A. Lower forward voltage reduces power dissipation and heat generation in the diode.

Q: Are all Active alternatives ROHS3 Compliant?

A: MBR1045G, MBR1045-E3/45, DSS10-0045B, and STPS1045D are all ROHS3 Compliant. MBR1040-BP, MBR1040F-BP, and MBR1045-BP do not specify RoHS status in the provided data. For designs requiring RoHS compliance, select from the ROHS3 Compliant alternatives.

Q: What is the maximum junction temperature range across all substitutes?

A: MBR1045G and STPS1045D maintain the original 175°C maximum. MBR1045-E3/45, DSS10-0045B, MBR1040-BP, MBR1040F-BP, and MBR1045-BP are rated to 150°C maximum. Verify thermal requirements for your application before selection.

Q: How does reverse leakage current affect part selection?

A: DSS10-0045B exhibits 5 µA reverse leakage at 45 V, significantly lower than the 100 µA specification of the original MBR1045 and most alternatives. Applications with strict leakage requirements may benefit from this part. MBR1040F-BP shows 500 µA leakage at 40 V, which is higher than standard specifications.

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