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 Diodes Incorporated MBR1045 is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter ranges for the same application category.

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 @ 10 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	—
RoHS Status	ROHS3 Compliant	—

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
Package / Case: TO-220-2
Mounting Type: Through Hole
Technology: Schottky

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Forward voltage drop must not exceed application circuit requirements
Speed: Fast Recovery characteristic (≤ 500ns, > 200mA) for switching applications
Current - Reverse Leakage @ Vr: Maximum 100 µA @ rated voltage
Operating Temperature - Junction: Minimum -65°C to 150°C range

Parts are grouped into three categories:

Direct Equivalents: Identical electrical specifications and package, different manufacturers or part number variants.

Manufacturer Recommended Substitutes: Active production parts with identical voltage and current ratings, minor variations in forward voltage or temperature range.

Parametric Equivalents: Parts meeting or exceeding all critical parameters with acceptable variations in secondary characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Tj Range [°C]	Product Status	Package
MBR1045	Diodes Incorporated	45	10	840 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	-65 to 150	Obsolete	TO-220-2
MBR1045	Taiwan Semiconductor Corporation	45	10	700 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	-55 to 150	Active	TO-220-2
MBR1045-E3/45	Vishay General Semiconductor - Diodes Division	45	10	570 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	-65 to 150	Active	TO-220-2
MBR1045-BP	Micro Commercial Co	45	10	Not Specified	No Recovery Time > 500mA	100 @ 45 V	-55 to 150	Active	TO-220-2
MBR1050	Fairchild Semiconductor	50	10	950 @ 10 A	Fast Recovery ≤ 500ns	100 @ 50 V	-65 to 150	Active	TO-220-2
STPS1045D	STMicroelectronics	45	10	600 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	-55 to 175	Active	TO-220-2
VS-MBR1045-M3	Vishay General Semiconductor - Diodes Division	45	10	840 @ 20 A	Fast Recovery ≤ 500ns	100 @ 45 V	-65 to 150	Active	TO-220-2

Engineering Selection Recommendations

Direct Equivalent Selection:

The MBR1045 from Taiwan Semiconductor Corporation and MBR1045-E3/45 from Vishay General Semiconductor - Diodes Division are direct functional equivalents with active product status. Both maintain the 45 V / 10 A rating and TO-220-2 package. The Taiwan Semiconductor Corporation variant offers lower forward voltage (700 mV vs. 840 mV), while the Vishay variant provides the lowest forward voltage (570 mV) and matches the original temperature range (-65°C to 150°C). Both are ROHS3 compliant.

Manufacturer Recommended Substitute:

STPS1045D from STMicroelectronics provides an active production alternative with identical voltage and current ratings. Forward voltage is 600 mV @ 10 A, representing a 29% reduction from the original specification. Maximum junction temperature extends to 175°C. This part is ROHS3 compliant with highest inventory availability (55,200 units).

Parametric Equivalent:

VS-MBR1045-M3 from Vishay maintains all critical electrical parameters with forward voltage specified at 840 mV @ 20 A. This part is suitable for applications requiring higher current measurement points and matches the original temperature range.

Higher Voltage Alternative:

MBR1050 from Fairchild Semiconductor provides a 50 V rated alternative for applications requiring additional voltage margin. Forward voltage is 950 mV @ 10 A. This part is appropriate only when circuit design permits the higher voltage rating.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance. REACH status varies: Taiwan Semiconductor Corporation and STMicroelectronics variants are REACH Unaffected, while Vishay variants are REACH Unaffected. Micro Commercial Co MBR1045-BP status is not specified for REACH.

Frequently Asked Questions (FAQ)

Q: Can the MBR1045 be directly replaced with any of the listed substitutes?

A: Direct replacement is possible with MBR1045 from Taiwan Semiconductor Corporation and MBR1045-E3/45 from Vishay. Both maintain identical voltage and current ratings in the same TO-220-2 package. Other parts require circuit design verification due to parameter variations.

Q: What is the primary difference between the original MBR1045 and the Taiwan Semiconductor Corporation equivalent?

A: The Taiwan Semiconductor Corporation MBR1045 has lower forward voltage (700 mV vs. 840 mV @ 10 A) and a slightly narrower operating temperature range (-55°C to 150°C vs. -65°C to 150°C). Both are electrically compatible for standard applications.

Q: Why is the Vishay MBR1045-E3/45 recommended as a primary substitute?

A: The MBR1045-E3/45 offers the lowest forward voltage (570 mV @ 10 A) among direct equivalents, reducing power dissipation. It maintains the original temperature range (-65°C to 150°C) and is actively produced with adequate inventory.

Q: Is the STPS1045D from STMicroelectronics a suitable replacement?

A: Yes. STPS1045D maintains the 45 V / 10 A rating and TO-220-2 package. Forward voltage is 600 mV @ 10 A. The maximum junction temperature is 175°C, providing thermal margin. Highest inventory availability supports procurement continuity.

Q: Can the MBR1050 be used as a substitute for the MBR1045?

A: The MBR1050 is a higher voltage rated part (50 V vs. 45 V). It is suitable only when circuit design permits the increased voltage rating. Forward voltage is higher (950 mV @ 10 A), resulting in greater power dissipation.

Q: What packaging options are available for MBR1045 substitutes?

A: All listed substitutes use the TO-220-2 through-hole package. Packaging variants include Tube (Vishay, STMicroelectronics) and Bulk (Micro Commercial Co, Fairchild). Tube packaging is standard for component handling and traceability.

Q: Are all substitutes RoHS compliant?

A: ROHS3 compliance is confirmed for MBR1045 (Diodes Incorporated), Taiwan Semiconductor Corporation variant, MBR1045-E3/45 (Vishay), and STPS1045D (STMicroelectronics). Compliance status for MBR1045-BP and MBR1050 is not specified in available data.

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

A: Forward voltage directly affects power dissipation in the diode. Lower forward voltage (570 mV for Vishay MBR1045-E3/45, 600 mV for STPS1045D) reduces heat generation compared to the original 840 mV specification. Circuit thermal design may benefit from lower forward voltage variants.

Q: Which substitute offers the best inventory availability?

A: STPS1045D from STMicroelectronics has the highest inventory (55,200 units), followed by VS-MBR1045-M3 from Vishay (8,652 units). Taiwan Semiconductor Corporation MBR1045 has 4,214 units available.

Q: Are there temperature range considerations for substitute selection?

A: The original MBR1045 operates from -65°C to 150°C. Taiwan Semiconductor Corporation and Micro Commercial Co variants operate from -55°C to 150°C, providing 10°C less low-temperature margin. STPS1045D extends to 175°C maximum junction temperature. Application requirements determine acceptable ranges.

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