Equivalent & Substitute Parts for MBR1045/45 Schottky Rectifier Diode

Part Overview

The MBR1045/45 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 45 V DC reverse voltage and 10 A average rectified current in a TO-220-2 through-hole package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with comparable or enhanced performance characteristics within the same package and application envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 20 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution eligibility for the MBR1045/45 is determined by the following critical parameters: voltage rating (45 V DC reverse minimum), current rating (10 A average rectified), package type (TO-220-2 through-hole), and technology classification (Schottky). Parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents maintain all electrical specifications and differ only in packaging format or product status. These parts are pin-compatible and electrically interchangeable without circuit modification.

Parametric Equivalents provide identical core electrical ratings (45 V, 10 A, Schottky technology, TO-220-2 package) with variations in secondary characteristics such as forward voltage or capacitance that do not affect primary circuit function.

Upgrade Alternatives meet or exceed the primary electrical requirements (45 V, 10 A, Schottky, TO-220-2) while offering improved performance metrics such as lower forward voltage drop or higher maximum junction temperature. These parts are functionally superior and directly substitutable.

Downgrade Alternatives provide reduced voltage ratings (40 V) or different recovery characteristics while maintaining 10 A current capacity and TO-220-2 packaging. These parts are suitable only for applications with lower voltage requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Speed	Tj (Max) [°C]	Product Status	RoHS Status
MBR1045/45	Vishay General Semiconductor	45	10	840 @ 20A	Fast Recovery ≤ 500ns	150	Obsolete	Non-compliant
MBR1045-E3/45	Vishay General Semiconductor	45	10	570 @ 10A	Fast Recovery ≤ 500ns	150	Active	ROHS3 Compliant
VS-MBR1045-M3	Vishay General Semiconductor	45	10	840 @ 20A	Fast Recovery ≤ 500ns	150	Active	Not specified
STPS1045D	STMicroelectronics	45	10	600 @ 10A	Fast Recovery ≤ 500ns	175	Active	ROHS3 Compliant
MBR1045-BP	Micro Commercial Co	45	10	Not specified	No Recovery Time > 500mA	150	Active	Not specified
MBR1045	Taiwan Semiconductor Corporation	45	10	700 @ 10A	Fast Recovery ≤ 500ns	150	Active	ROHS3 Compliant
MBR1040-BP	Micro Commercial Co	40	10	Not specified	No Recovery Time > 500mA	150	Active	Not specified
MBR1050	Fairchild Semiconductor	50	10	950 @ 10A	Fast Recovery ≤ 500ns	150	Active	Not specified

Engineering Selection Recommendations

Primary Recommendation: MBR1045-E3/45 (Vishay General Semiconductor)

The MBR1045-E3/45 is the preferred direct substitute for the obsolete MBR1045/45. This part maintains identical voltage (45 V), current (10 A), and package specifications (TO-220-2 through-hole). The MBR1045-E3/45 is in active production status with ROHS3 compliance, addressing regulatory requirements for new designs. The forward voltage specification (570 mV @ 10 A) is lower than the original part, resulting in reduced power dissipation. Inventory availability is substantial at 2,350 units.

Secondary Recommendation: STPS1045D (STMicroelectronics)

The STPS1045D provides equivalent electrical performance with enhanced thermal characteristics. Maximum junction temperature is rated at 175°C compared to 150°C for the original part, providing improved thermal margin in high-temperature applications. Forward voltage (600 mV @ 10 A) is lower than the original specification. ROHS3 compliance is confirmed. Inventory availability is highest among all substitutes at 55,200 units.

Tertiary Recommendation: MBR1045 (Taiwan Semiconductor Corporation)

The MBR1045 from Taiwan Semiconductor Corporation maintains full electrical equivalence with 45 V rating, 10 A current, and fast recovery characteristics. ROHS3 compliance is confirmed. This part is suitable for applications requiring strict parameter matching with the original MBR1045/45. Inventory availability is 4,214 units.

Alternative for Reduced Voltage Applications: MBR1040-BP (Micro Commercial Co)

The MBR1040-BP is suitable only for applications where the circuit operates at voltages below 40 V. This part reduces the voltage safety margin and should be selected only when the application voltage requirement is confirmed to be 40 V or lower. Inventory availability is 949 units.

Alternative for Elevated Voltage Applications: MBR1050 (Fairchild Semiconductor)

The MBR1050 provides a 50 V rating, suitable for applications requiring higher voltage margin than the original 45 V specification. This part is functionally compatible but introduces higher forward voltage (950 mV @ 10 A), resulting in increased power dissipation. Selection should be based on specific circuit voltage requirements. Inventory availability is 1,972 units.

Frequently Asked Questions (FAQ)

Q: Can the MBR1045-E3/45 be used as a direct replacement for the MBR1045/45 without circuit modification?

A: Yes. The MBR1045-E3/45 maintains identical voltage rating (45 V), current rating (10 A), package type (TO-220-2), and mounting configuration (through-hole). Pin compatibility is confirmed. The lower forward voltage specification (570 mV @ 10 A versus 840 mV @ 20 A) results in reduced power dissipation, which is beneficial for thermal performance.

Q: What is the difference between "Fast Recovery ≤ 500ns" and "No Recovery Time > 500mA" specifications?

A: Fast Recovery ≤ 500ns indicates a Schottky diode with specified recovery time of 500 nanoseconds or less at currents exceeding 200 mA. "No Recovery Time > 500mA" indicates a different recovery characteristic specification. These represent different measurement methodologies and should be evaluated based on specific circuit switching requirements.

Q: Is the STPS1045D suitable for applications requiring the original MBR1045/45 specifications?

A: Yes. The STPS1045D meets all primary electrical requirements: 45 V DC reverse voltage, 10 A average rectified current, Schottky technology, and TO-220-2 package. The enhanced maximum junction temperature (175°C versus 150°C) and lower forward voltage (600 mV @ 10 A) represent performance improvements. ROHS3 compliance is confirmed.

Q: Can the MBR1040-BP be used in place of the MBR1045/45?

A: The MBR1040-BP is suitable only for applications where the circuit operates at voltages of 40 V or lower. The reduced voltage rating (40 V versus 45 V) eliminates the 5 V safety margin provided by the original part. Use of this part in circuits designed for 45 V operation is not recommended.

Q: What is the significance of ROHS3 compliance for substitute part selection?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances Directive requirements, which restricts the use of specific hazardous materials in electrical and electronic equipment. For new designs and procurement in regulated markets, ROHS3-compliant parts are required. The MBR1045-E3/45, STPS1045D, and MBR1045 (Taiwan Semiconductor Corporation) all carry ROHS3 certification.

Q: Are all substitute parts available in the same packaging format as the original MBR1045/45?

A: All substitute parts listed maintain the TO-220-2 through-hole package configuration. Packaging format variations (Tube, Bulk) refer to the quantity and container type for procurement and do not affect the component package or pin configuration. All parts are mechanically and electrically compatible with the original TO-220-2 footprint.

Q: What inventory considerations should guide substitute part selection?

A: Inventory availability varies significantly among substitutes. The STPS1045D offers the highest availability at 55,200 units, followed by VS-MBR1045-M3 at 8,652 units. For applications requiring immediate procurement, parts with higher inventory levels reduce lead time risk. For long-term production, multiple qualified sources should be maintained.

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