40EPF10 Equivalent & Substitute Parts

Part Overview

The 40EPF10 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 40 A average rectified current in a TO-247AC Modified through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status and limited availability from original sources, identifying equivalent and substitute parts is necessary for ongoing design support and production continuity. Active alternatives with comparable or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	40	A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 40 A	V
Reverse Recovery Time (trr)	450	ns
Current - Reverse Leakage @ Vr	100 µA @ 1000 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-247-2	—
Operating Temperature - Junction	-40 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the 40EPF10 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Current - Average Rectified (Io): 40 A or greater
Mounting Type: Through Hole
Package / Case: TO-247 family (TO-247-2 or equivalent mechanical compatibility)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Category 1: Direct Parametric Equivalent The VS-40EPF10-M3 is a parametric equivalent manufactured by Vishay General Semiconductor - Diodes Division. It maintains identical electrical specifications to the 40EPF10 while offering active product status and improved compliance certifications.

Category 2: Reduced Current Rating Substitutes The APT15D100BG and APT15DQ100BG (Microchip Technology) are rated for 15 A average rectified current, which is below the 40 A specification of the main part. These substitutes are applicable only in applications where the actual circuit current requirement does not exceed 15 A, despite the original design specification.

Category 3: Intermediate Current Rating Substitutes The STTH3010W (STMicroelectronics) is rated for 30 A average rectified current, positioned between the reduced-current and full-current options. This substitute is applicable in applications where circuit current requirements fall between 30 A and 40 A.

Category 4: Elevated Current Rating Substitutes The STTH6010WY (STMicroelectronics) is rated for 60 A average rectified current, exceeding the 40 A specification of the main part. This substitute provides additional current capacity margin and is applicable across the full operating range of the 40EPF10.

All substitute parts maintain the 1000 V DC reverse voltage rating and fast recovery speed classification required for compatibility with the original design.

Parameter Comparison

Parameter	40EPF10	VS-40EPF10-M3	APT15D100BG	APT15DQ100BG	STTH3010W	STTH6010WY
Manufacturer	Vishay	Vishay	Microchip	Microchip	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	40 A	40 A	15 A	15 A	30 A	60 A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 40 A	1.4 V @ 40 A	2.3 V @ 15 A	3 V @ 15 A	2 V @ 30 A	2 V @ 60 A
Reverse Recovery Time (trr)	450 ns	450 ns	260 ns	235 ns	100 ns	115 ns
Current - Reverse Leakage @ Vr	100 µA @ 1000 V	100 µA @ 1000 V	250 µA @ 1000 V	100 µA @ 1000 V	15 µA @ 1000 V	20 µA @ 1000 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-247-2	TO-247-2	TO-247-2	TO-247-3	DO-247-2	DO-247-2
Operating Temperature - Junction (Max)	150°C	150°C	175°C	175°C	175°C	175°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: VS-40EPF10-M3

The VS-40EPF10-M3 is the recommended substitute for direct replacement of the 40EPF10. This part is manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) and maintains identical electrical specifications across all critical parameters: 1000 V reverse voltage, 40 A average rectified current, 1.4 V forward voltage at 40 A, and 450 ns reverse recovery time. The VS-40EPF10-M3 carries active product status and ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original part. Mechanical compatibility is confirmed through identical TO-247-2 package designation. This substitute requires no circuit redesign or thermal management recalculation.

Secondary Selection: STTH6010WY

The STTH6010WY (STMicroelectronics) is suitable for applications where the 40EPF10 is specified but design margin or future capacity expansion is desired. This part exceeds the current rating at 60 A, maintains the 1000 V voltage specification, and offers superior reverse recovery characteristics (115 ns versus 450 ns). The STTH6010WY is ROHS3 compliant and carries active product status. The DO-247-2 package is mechanically compatible with TO-247-2 applications in through-hole mounting. Forward voltage at rated current (2 V @ 60 A) is lower than the original specification, resulting in reduced power dissipation. This substitute is applicable without circuit modification.

Tertiary Selection: STTH3010W

The STTH3010W (STMicroelectronics) is suitable for applications where actual circuit current requirements are confirmed to be 30 A or less. This part maintains the 1000 V voltage specification and fast recovery speed classification. The STTH3010W offers significantly improved reverse recovery time (100 ns versus 450 ns) and lower reverse leakage current (15 µA versus 100 µA). The DO-247-2 package is mechanically compatible with TO-247-2 applications. This substitute is applicable without circuit modification when current requirements are verified to be within its 30 A rating.

Limited Applicability: APT15D100BG and APT15DQ100BG

The APT15D100BG and APT15DQ100BG (Microchip Technology) are rated for 15 A average rectified current. These substitutes are applicable only in applications where the actual circuit current requirement does not exceed 15 A. Use of these parts in circuits designed for 40 A operation will result in component failure. Both parts maintain the 1000 V voltage specification and fast recovery speed classification. These substitutes are ROHS3 compliant and carry active product status. Selection of these parts requires verification that circuit current demands are substantially below the original 40 A specification.

Compliance and Availability Considerations

All recommended substitutes (VS-40EPF10-M3, STTH6010WY, STTH3010W) are ROHS3 compliant and carry active product status, addressing the regulatory and supply chain limitations of the obsolete 40EPF10. The VS-40EPF10-M3 offers the lowest implementation risk due to parametric equivalence. The STMicroelectronics options (STTH6010WY and STTH3010W) provide enhanced performance characteristics and extended operating temperature ranges (175°C maximum junction temperature versus 150°C for the original part).

Frequently Asked Questions (FAQ)

Q: Can the VS-40EPF10-M3 be used as a direct replacement for the 40EPF10?

A: Yes. The VS-40EPF10-M3 is a parametric equivalent with identical electrical specifications: 1000 V reverse voltage, 40 A average rectified current, 1.4 V forward voltage at 40 A, and 450 ns reverse recovery time. Both parts use the TO-247-2 package. No circuit modification is required.

Q: What is the difference between the TO-247-2 and DO-247-2 packages?

A: Both TO-247-2 and DO-247-2 are through-hole packages with identical pin configurations and mechanical compatibility for standard PCB mounting. The designations reflect different manufacturer naming conventions. Parts in either package can be used interchangeably in applications designed for through-hole mounting.

Q: Can the STTH6010WY be used in place of the 40EPF10?

A: Yes. The STTH6010WY maintains the 1000 V reverse voltage specification and exceeds the 40 A current rating at 60 A. The part is mechanically compatible through the DO-247-2 package. The STTH6010WY offers improved reverse recovery time (115 ns versus 450 ns) and lower forward voltage drop (2 V @ 60 A), resulting in reduced power dissipation. No circuit modification is required.

Q: Can the STTH3010W be used in place of the 40EPF10?

A: The STTH3010W is suitable only if the actual circuit current requirement is confirmed to be 30 A or less. The part maintains the 1000 V reverse voltage specification and fast recovery speed classification. The STTH3010W offers improved reverse recovery time (100 ns versus 450 ns) and significantly lower reverse leakage current (15 µA versus 100 µA). No circuit modification is required when current requirements are verified to be within its 30 A rating.

Q: Can the APT15D100BG or APT15DQ100BG be used in place of the 40EPF10?

A: These parts are rated for 15 A average rectified current and are suitable only in applications where the actual circuit current requirement does not exceed 15 A. Use in circuits designed for 40 A operation will result in component failure. Verification of actual circuit current demands is required before selection.

Q: What are the key differences in reverse recovery time among the substitute options?

A: The 40EPF10 has a reverse recovery time of 450 ns. The VS-40EPF10-M3 maintains this specification at 450 ns. The STMicroelectronics options offer significantly faster recovery: STTH6010WY at 115 ns and STTH3010W at 100 ns. Faster recovery times reduce switching losses and improve efficiency in high-frequency applications. The Microchip options (APT15D100BG at 260 ns and APT15DQ100BG at 235 ns) offer intermediate recovery performance.

Q: Are all substitute parts RoHS compliant?

A: The 40EPF10 is RoHS non-compliant. All recommended substitutes (VS-40EPF10-M3, APT15D100BG, APT15DQ100BG, STTH3010W, and STTH6010WY) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: What is the maximum operating temperature for each substitute?

A: The 40EPF10 is rated to 150°C maximum junction temperature. The VS-40EPF10-M3 maintains this specification at 150°C. All other substitutes (APT15D100BG, APT15DQ100BG, STTH3010W, and STTH6010WY) are rated to 175°C maximum junction temperature, providing additional thermal margin in high-temperature applications.

Q: How do forward voltage drops compare among the substitutes?

A: The 40EPF10 has a forward voltage of 1.4 V @ 40 A. The VS-40EPF10-M3 maintains this specification. The STTH6010WY and STTH3010W both have 2 V forward voltage at their respective rated currents (60 A and 30 A), representing a 0.6 V increase. The APT15D100BG has 2.3 V @ 15 A, and the APT15DQ100BG has 3 V @ 15 A. Higher forward voltage results in increased power dissipation; thermal design should account for this difference when selecting substitutes with higher forward voltage specifications.

Q: What is the reverse leakage current specification for each part?

A: The 40EPF10 has reverse leakage of 100 µA @ 1000 V. The VS-40EPF10-M3 maintains this specification. The APT15D100BG has 250 µA @ 1000 V, representing higher leakage. The APT15DQ100BG has 100 µA @ 1000 V, matching the original. The STTH3010W has 15 µA @ 1000 V, and the STTH6010WY has 20 µA @ 1000 V, both significantly lower than the original specification. Lower reverse leakage reduces standby power consumption and improves circuit efficiency.

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