MBR1040 Equivalent & Substitute Parts

Part Overview

The MBR1040 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 10 A average rectified current in a through-hole TO-220AC package. Manufactured by Diodes Incorporated, this component is classified as obsolete product status. Due to its obsolete designation, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	10 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 10 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 40 V
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C

Substitute Part Grouping Explanation

Substitution of the MBR1040 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 40 V
Current - Average Rectified (Io) rating must equal or exceed 10 A
Technology must be Schottky
Mounting type must be Through Hole
Package must be TO-220-2 or equivalent TO-220AC configuration

Acceptable Variation Parameters:

Voltage - Forward (Vf) may vary within acceptable circuit design margins
Operating temperature range may differ provided minimum junction temperature does not fall below -55°C and maximum does not fall below 150°C
Current - Reverse Leakage may vary at the rated voltage
Capacitance specifications may be absent in substitute parts without affecting functional compatibility

All substitute parts listed meet or exceed the mandatory compatibility criteria and are available from active manufacturers with current product status.

Parameter Comparison

Parameter	MBR1040	MBR1040-BP	MBR1045-E3/45	MBR1045G	STPS1045D
Manufacturer	Diodes Incorporated	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	45 V	45 V	45 V
Current - Average Rectified (Io)	10 A	10 A	10 A	10 A	10 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 10 A	Not Specified	570 mV @ 10 A	840 mV @ 20 A	600 mV @ 10 A
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	No Recovery Time > 500mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 40 V	100 µA @ 40 V	100 µA @ 45 V	100 µA @ 45 V	100 µA @ 45 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 175°C	Max 175°C
RoHS Status	ROHS3 Compliant	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

MBR1040-BP (Micro Commercial Co)

This substitute provides direct voltage and current rating equivalence at 40 V and 10 A. Product status is active with current manufacturing availability. The component is REACH Unaffected, eliminating regulatory compliance concerns associated with the original MBR1040. Operating temperature range extends to -55°C minimum, which is acceptable for most industrial applications. This part represents the closest functional equivalent to the obsolete MBR1040.

MBR1045-E3/45 (Vishay General Semiconductor - Diodes Division)

This substitute provides enhanced voltage rating at 45 V while maintaining 10 A current capacity. Forward voltage is reduced to 570 mV at 10 A, indicating improved efficiency characteristics. Product status is active with high inventory availability (2350 pcs). RoHS3 compliance and REACH Unaffected status ensure regulatory alignment. Operating temperature range matches the original specification at -65°C to 150°C. This part is suitable for applications where the higher voltage rating provides design margin.

MBR1045G (onsemi)

This substitute offers 45 V voltage rating with 10 A current capacity in the SWITCHMODE™ series. Product status is active with substantial inventory (50200 pcs). Operating temperature range extends to 175°C maximum, providing thermal margin for high-temperature environments. RoHS3 compliance and REACH Unaffected status are confirmed. This part is suitable for applications requiring extended thermal performance.

STPS1045D (STMicroelectronics)

This substitute provides 45 V voltage rating with 10 A current capacity. Forward voltage is specified at 600 mV at 10 A. Product status is active with high inventory availability (55200 pcs). RoHS3 compliance and REACH Unaffected status are confirmed. Operating temperature maximum is 175°C. This part is suitable for general-purpose rectification applications requiring active manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the MBR1040 be directly replaced with any of these substitute parts?

A: Yes. All listed substitute parts meet the mandatory compatibility criteria: 40 V minimum voltage rating, 10 A minimum current rating, Schottky technology, through-hole mounting, and TO-220-2 package configuration. Direct pin-compatible replacement is possible without circuit modification.

Q: What is the difference between the 40 V rated MBR1040-BP and the 45 V rated alternatives?

A: The MBR1040-BP maintains the original 40 V specification, providing exact voltage equivalence. The 45 V alternatives (MBR1045-E3/45, MBR1045G, STPS1045D) provide higher voltage rating, which increases design margin but does not affect compatibility in 40 V applications. Selection depends on circuit design requirements and available inventory.

Q: Are there compliance differences between these substitute parts?

A: The original MBR1040 is REACH Affected. All substitute parts are REACH Unaffected, eliminating regulatory compliance concerns. All active substitutes maintain RoHS3 compliance status. For applications requiring specific regulatory compliance, the REACH Unaffected status of all substitutes represents an improvement over the original component.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage variations (570 mV to 840 mV at 10 A) affect power dissipation and heat generation. Lower forward voltage (MBR1045-E3/45 at 570 mV) results in reduced power loss. Higher forward voltage (MBR1040 and MBR1045G at 840 mV) results in increased power loss. Selection should be based on thermal design requirements and efficiency specifications of the application.

Q: What is the significance of the operating temperature range differences?

A: The original MBR1040 operates from -65°C to 150°C. MBR1040-BP operates from -55°C to 150°C, which is acceptable for most industrial applications but may not be suitable for extreme cold environments. MBR1045G and STPS1045D extend the maximum temperature to 175°C, providing thermal margin for high-temperature applications. Selection depends on the specific operating environment.

Q: Why is the MBR1040 classified as obsolete?

A: Obsolete status indicates the manufacturer (Diodes Incorporated) has discontinued production. Active substitutes from other manufacturers ensure continued component availability for new designs and field replacements.

Q: Are there inventory considerations for these substitute parts?

A: Yes. MBR1045G has the highest inventory (50200 pcs), followed by STPS1045D (55200 pcs), MBR1045-E3/45 (2350 pcs), and MBR1040-BP (949 pcs). For applications requiring immediate availability, MBR1045G or STPS1045D are preferred. For exact voltage equivalence with active status, MBR1040-BP is recommended.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the constraints of circuit design specifications. All parts are pin-compatible in TO-220-2 packages. Verify that the application circuit can accommodate the voltage and current ratings of the selected substitute. Forward voltage differences may affect thermal design but do not prevent functional substitution.

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