40EPF06 Equivalent & Substitute Parts

Part Overview

The 40EPF06 is a general-purpose rectifier diode rated for 600 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 relative to active alternatives, equivalent substitute parts are necessary for ongoing design support and production continuity. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating package variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	40	A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 40 A	V
Reverse Recovery Time (trr)	180	ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-247-2	—
Operating Temperature - Junction	-40°C to 150°C	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 40EPF06 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 600 V to ensure safe operation in the original application circuit.

Current Rating: The 40EPF06 is rated for 40 A average rectified current. Substitute parts with lower current ratings (30 A) are acceptable only when the application circuit does not require the full 40 A capacity. Substitutes with 30 A ratings represent a current derating and must be evaluated against actual circuit load requirements.

Package Compatibility: The original part uses TO-247-2 package with TO-247AC Modified supplier designation. Substitute parts may use TO-247-2, TO-247 [B], or DO-247-2 packages, all of which are mechanically compatible through-hole configurations suitable for the same PCB footprint.

Recovery Characteristics: All substitutes maintain fast recovery classification (≤ 500ns, > 200mA). Reverse recovery time values vary among substitutes but remain within acceptable fast-recovery parameters.

Thermal Range: The 40EPF06 operates from -40°C to 150°C junction temperature. Substitutes with extended ranges (-55°C to 175°C) provide additional thermal margin and are directly compatible.

Compliance Status: The 40EPF06 is RoHS non-compliant. Active substitute parts are RoHS3 compliant, supporting modern supply chain requirements.

Parameter Comparison

Parameter	40EPF06	VS-40EPF06-M3	APT30D60BG	RHRG3060-F085	RURG3060-F085	STTH3006W
Manufacturer	Vishay	Vishay	Microchip	onsemi	onsemi	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	40 A	40 A	30 A	30 A	30 A	30 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 40 A	1.25 V @ 40 A	1.8 V @ 30 A	2.1 V @ 30 A	1.5 V @ 30 A	1.85 V @ 30 A
Reverse Recovery Time (trr)	180 ns	180 ns	85 ns	45 ns	80 ns	70 ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	100 µA @ 600 V	250 µA @ 600 V	250 µA @ 600 V	250 µA @ 600 V	25 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
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-247-2	TO-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
AEC-Q101 Qualification	—	—	—	Yes	Yes	—

Engineering Selection Recommendations

Direct Parametric Equivalent (Preferred for Pin-Compatible Replacement):

VS-40EPF06-M3 is the direct parametric equivalent to the 40EPF06. Both parts share identical electrical specifications: 600 V reverse voltage, 40 A average rectified current, 1.25 V forward voltage at 40 A, and 180 ns reverse recovery time. The VS-40EPF06-M3 is manufactured by the same supplier (Vishay) and maintains the same TO-247-2 package. The primary distinction is product status: VS-40EPF06-M3 is active and RoHS3 compliant, whereas the 40EPF06 is obsolete and RoHS non-compliant. This part is suitable for direct substitution without circuit modification.

Current-Derated Alternatives (30 A Rated):

APT30D60BG (Microchip), RHRG3060-F085 (onsemi), RURG3060-F085 (onsemi), and STTH3006W (STMicroelectronics) are all rated for 30 A average rectified current, representing a 25% current derating from the original 40 A specification. These parts maintain the 600 V reverse voltage rating and fast recovery characteristics. Selection among these alternatives depends on application current requirements and compliance needs:

APT30D60BG provides active product status and RoHS3 compliance with 85 ns reverse recovery time and extended thermal range (-55°C to 175°C).

RHRG3060-F085 and RURG3060-F085 are automotive-grade parts with AEC-Q101 qualification. RURG3060-F085 offers superior forward voltage characteristics (1.5 V @ 30 A) and faster recovery time (80 ns) compared to RHRG3060-F085 (2.1 V @ 30 A, 45 ns recovery). Both support extended thermal operation to 175°C.

STTH3006W (STMicroelectronics) features the lowest reverse leakage current (25 µA @ 600 V) and fast recovery time (70 ns). Package designation is DO-247-2 with straight leads, mechanically compatible with TO-247-2 footprints.

Compliance Considerations:

All active substitute parts are RoHS3 compliant, supporting modern procurement and environmental standards. RHRG3060-F085 and RURG3060-F085 carry AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can VS-40EPF06-M3 be used as a direct replacement for 40EPF06?

A: Yes. VS-40EPF06-M3 is electrically and mechanically identical to the 40EPF06. Both are rated for 600 V, 40 A, with identical forward voltage and recovery characteristics. The primary difference is that VS-40EPF06-M3 is active and RoHS3 compliant, whereas 40EPF06 is obsolete. No circuit modifications are required.

Q: Why do some substitutes have lower current ratings (30 A instead of 40 A)?

A: APT30D60BG, RHRG3060-F085, RURG3060-F085, and STTH3006W are rated for 30 A average rectified current. These parts are acceptable substitutes only when the application circuit does not require the full 40 A capacity. If the circuit demands 40 A operation, only VS-40EPF06-M3 maintains the original current rating. Verify actual circuit load requirements before selecting a 30 A rated part.

Q: Are the package differences between TO-247-2 and DO-247-2 significant?

A: TO-247-2 and DO-247-2 are both through-hole packages with compatible PCB footprints. STTH3006W uses DO-247-2 with straight leads, while the original 40EPF06 and most substitutes use TO-247-2. Both packages fit standard TO-247 footprints. Mechanical compatibility is maintained across these package variants.

Q: What is the significance of reverse recovery time differences among substitutes?

A: Reverse recovery time (trr) affects switching speed and switching losses in rectifier applications. The 40EPF06 has 180 ns recovery time. Substitutes range from 45 ns (RHRG3060-F085) to 85 ns (APT30D60BG). Faster recovery times reduce switching losses and heat generation. If the application is sensitive to switching performance, select substitutes with lower trr values. If switching speed is not critical, any substitute within the fast recovery classification is acceptable.

Q: Should I select an automotive-qualified part (RHRG3060-F085 or RURG3060-F085) for non-automotive applications?

A: Automotive-qualified parts (AEC-Q101) meet stringent reliability and quality standards applicable to automotive environments. These qualifications do not restrict use in non-automotive applications. Selection should be based on application requirements, compliance mandates, and availability rather than automotive qualification alone.

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

A: Forward voltage (Vf) affects power dissipation in the diode. The 40EPF06 has 1.25 V @ 40 A. Substitutes range from 1.5 V (RURG3060-F085) to 2.1 V (RHRG3060-F085) at their respective current ratings. Higher forward voltage results in greater power dissipation and heat generation. For applications sensitive to thermal performance, select substitutes with lower forward voltage specifications.

Q: Is RoHS compliance mandatory for my application?

A: RoHS compliance is determined by regulatory requirements in your target market and customer specifications. The 40EPF06 is RoHS non-compliant. All active substitutes are RoHS3 compliant. If your application or supply chain requires RoHS compliance, select from the active substitute parts. If RoHS compliance is not required, the 40EPF06 remains available if procurement channels support obsolete inventory.

Q: Can I use STTH3006W if my PCB is designed for TO-247AC Modified package?

A: STTH3006W uses DO-247-2 package with straight leads, while the original 40EPF06 uses TO-247AC Modified. Both packages are mechanically compatible with standard TO-247 PCB footprints. Physical fit and electrical connection are maintained. Verify that your PCB layout accommodates the straight-lead configuration of the DO-247-2 package.

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