8EWF04STRL Equivalent & Substitute Parts

Part Overview

The 8EWF04STRL is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V DC reverse voltage and 8 A average rectified current in a surface mount TO-252AA (DPAK) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The diode features fast recovery characteristics with a reverse recovery time of 140 ns and operates across a junction temperature range of -40°C to 150°C. Due to its obsolete status and non-RoHS3 compliance, alternative components with active product status are required for new designs and legacy system replacements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.2 @ 8 A	V
Reverse Recovery Time (trr)	140	ns
Current - Reverse Leakage @ Vr	100 @ 200 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction	-40 to 150	°C
Product Status	Obsolete	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 8EWF04STRL is determined by the following critical parameters: voltage rating (400 V DC reverse), current rating (8 A average rectified), forward voltage drop (1.2 V maximum at 8 A), reverse recovery time classification (fast recovery ≤ 500ns), package type (TO-252-3 DPAK), and thermal operating range (-40°C to 150°C).

Substitute parts are grouped into two categories:

Parametric Equivalents (Vishay VS-8EWF04 Series): Parts VS-8EWF04STR-M3, VS-8EWF04STRL-M3, and VS-8EWF04STRR-M3 maintain identical voltage and current ratings, forward voltage characteristics, package configuration, and operating temperature range. These parts are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) and share the same base product number (8EWF04). All three are active products with RoHS3 compliance. Differences exist in reverse recovery time (55 ns for STR-M3 and STRL-M3; 200 ns for STRR-M3) and reverse leakage current measurement conditions (100 µA @ 400 V for all VS variants versus 100 µA @ 200 V for the original 8EWF04STRL).

Manufacturer-Recommended Substitute (onsemi NRVUD340T4G-VF01): This part is designated as a manufacturer-recommended alternative. It maintains the 400 V voltage rating and DPAK package configuration but differs in current rating (3 A versus 8 A), forward voltage (1.15 V @ 3 A), reverse recovery time (50 ns), and operating temperature range (-55°C to 175°C). This part is classified as obsolete and is suitable only for applications where the reduced current rating is acceptable.

Parameter Comparison

Parameter	8EWF04STRL	VS-8EWF04STR-M3	VS-8EWF04STRL-M3	VS-8EWF04STRR-M3	NRVUD340T4G-VF01
Manufacturer	Vishay	Vishay	Vishay	Vishay	onsemi
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	8 A	8 A	8 A	8 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 8 A	1.2 V @ 8 A	1.2 V @ 8 A	1.2 V @ 8 A	1.15 V @ 3 A
Reverse Recovery Time (trr)	140 ns	55 ns	55 ns	200 ns	50 ns
Current - Reverse Leakage @ Vr	100 µA @ 200 V	100 µA @ 400 V	100 µA @ 400 V	100 µA @ 400 V	5 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature - Junction	-40 to 150°C	-40 to 150°C	-40 to 150°C	-40 to 150°C	-55 to 175°C
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Bulk

Engineering Selection Recommendations

Primary Substitutes (Vishay VS-8EWF04 Series):

The three Vishay variants—VS-8EWF04STR-M3, VS-8EWF04STRL-M3, and VS-8EWF04STRR-M3—are the preferred substitutes for the 8EWF04STRL. All three maintain full electrical equivalence in voltage rating (400 V), current rating (8 A), forward voltage (1.2 V @ 8 A), and package configuration (TO-252-3 DPAK). All three are active products with RoHS3 compliance, addressing the regulatory limitations of the obsolete original part.

Selection among these three variants depends on reverse recovery time requirements:

VS-8EWF04STR-M3 and VS-8EWF04STRL-M3 feature a reverse recovery time of 55 ns, representing an improvement over the original 140 ns specification. These variants are suitable for applications requiring faster switching performance.

VS-8EWF04STRR-M3 features a reverse recovery time of 200 ns, which exceeds the original 140 ns specification. This variant is suitable for applications where the original recovery time specification is not a limiting constraint.

All three Vishay variants are supplied in Tape & Reel packaging, appropriate for automated assembly processes.

Alternative Substitute (onsemi NRVUD340T4G-VF01):

The NRVUD340T4G-VF01 is designated as a manufacturer-recommended substitute but is classified as obsolete. This part is suitable only for applications where the current rating can be reduced from 8 A to 3 A. The 400 V voltage rating and DPAK package are maintained. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin compared to the original part. This substitute is not recommended for new designs due to its obsolete status and reduced current capacity.

Frequently Asked Questions (FAQ)

Q: Can the VS-8EWF04STR-M3, VS-8EWF04STRL-M3, or VS-8EWF04STRR-M3 be used as direct replacements for the 8EWF04STRL?

A: Yes. All three Vishay variants maintain the same voltage rating (400 V), current rating (8 A), forward voltage (1.2 V @ 8 A), and package configuration (TO-252-3 DPAK). They are electrically and mechanically compatible. The primary differences are reverse recovery time and reverse leakage measurement conditions, which do not prevent direct substitution in applications designed for the original part.

Q: What is the difference between the three Vishay substitute parts?

A: The three parts differ in reverse recovery time: VS-8EWF04STR-M3 and VS-8EWF04STRL-M3 have 55 ns recovery time, while VS-8EWF04STRR-M3 has 200 ns recovery time. All other electrical and mechanical parameters are identical. Selection depends on the application's switching speed requirements.

Q: Why is the NRVUD340T4G-VF01 listed as a substitute if it has a lower current rating?

A: The NRVUD340T4G-VF01 is designated as a manufacturer-recommended alternative by Vishay. However, its 3 A current rating is insufficient for applications requiring the full 8 A capacity of the 8EWF04STRL. This part is suitable only for applications where the reduced current rating is acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: The three Vishay variants (VS-8EWF04STR-M3, VS-8EWF04STRL-M3, and VS-8EWF04STRR-M3) are RoHS3 compliant. The onsemi NRVUD340T4G-VF01 is also RoHS3 compliant. The original 8EWF04STRL is non-compliant. Substitution with any of the active Vishay variants addresses RoHS compliance requirements.

Q: What packaging formats are available for the substitute parts?

A: The three Vishay variants are supplied in Tape & Reel (TR) packaging, suitable for automated assembly. The original 8EWF04STRL and the onsemi NRVUD340T4G-VF01 are supplied in bulk packaging. Tape & Reel packaging is standard for high-volume production environments.

Q: Can the reverse recovery time difference affect circuit performance?

A: Reverse recovery time affects switching speed and switching losses in rectifier applications. The VS-8EWF04STR-M3 and VS-8EWF04STRL-M3 (55 ns) provide faster switching than the original 140 ns specification, potentially reducing switching losses. The VS-8EWF04STRR-M3 (200 ns) has slower switching than the original. Application-specific circuit analysis determines whether these differences are significant.

Q: Are the reverse leakage current specifications equivalent?

A: The original 8EWF04STRL specifies 100 µA @ 200 V, while the three Vishay variants specify 100 µA @ 400 V. The Vishay variants provide leakage current specification at the full rated voltage, which is a more stringent measurement condition. The onsemi NRVUD340T4G-VF01 specifies 5 µA @ 400 V, indicating lower leakage current.

Q: What is the inventory status of the substitute parts?

A: VS-8EWF04STR-M3 has 903 pieces in stock, VS-8EWF04STRL-M3 has 714 pieces in stock, and VS-8EWF04STRR-M3 has 1024 pieces in stock. The onsemi NRVUD340T4G-VF01 has 10,100 pieces in stock. The original 8EWF04STRL has 632 pieces in stock.

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