Equivalent & Substitute Parts for 20ETF04S

Part Overview

The 20ETF04S is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V DC reverse voltage and 20 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement.

The 20ETF04S features fast recovery characteristics with a reverse recovery time of 160 ns and forward voltage of 1.3 V at 20 A. Due to its obsolete status and non-RoHS compliance, active alternatives are required for new designs and production continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	20 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 20 A
Reverse Recovery Time (trr)	160 ns
Current - Reverse Leakage @ Vr	100 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Operating Temperature - Junction	-40°C ~ 150°C
Technology	Standard

Substitute Part Grouping Explanation

Substitute parts for the 20ETF04S are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Substitutes that maintain identical electrical specifications and package form factor. These parts satisfy the core requirements: 400 V reverse voltage rating, 20 A average rectified current, fast recovery characteristics, TO-263AB package, and -40°C to 150°C operating temperature range. Parametric equivalents differ only in product status (active vs. obsolete) and RoHS compliance.

Manufacturer Recommended Alternatives (Functional Substitutes): Substitutes that meet or exceed the electrical performance requirements but may differ in specific parameters such as current rating, reverse recovery time, or reverse leakage current. These parts maintain the same package form factor and voltage rating but offer enhanced performance characteristics or different thermal specifications.

The following key parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 20 A
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Must be Surface Mount
Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Parameter Comparison

Parameter	20ETF04S	VS-20ETF04STRL-M3	VS-20ETF04STRR-M3	RFUH20NS3STL	STTH30R04G	STTH30R04G-TR
Manufacturer	Vishay	Vishay	Vishay	Rohm	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	350 V	400 V	400 V
Current - Average Rectified (Io)	20 A	20 A	20 A	20 A	30 A	30 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 20 A	1.3 V @ 20 A	1.3 V @ 20 A	1.5 V @ 20 A	1.45 V @ 30 A	1.45 V @ 30 A
Reverse Recovery Time (trr)	160 ns	160 ns	160 ns	25 ns	100 ns	100 ns
Current - Reverse Leakage @ Vr	100 µA @ 400 V	100 µA @ 400 V	100 µA @ 400 V	10 µA @ 350 V	15 µA @ 400 V	15 µA @ 400 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)
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	150°C	-40°C ~ 175°C	-40°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
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tube	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Parametric Equivalents - Vishay VS-20ETF04STRL-M3 and VS-20ETF04STRR-M3:

These parts are direct electrical and mechanical equivalents to the 20ETF04S. Both maintain identical specifications for voltage rating (400 V), current rating (20 A), forward voltage (1.3 V @ 20 A), reverse recovery time (160 ns), and reverse leakage current (100 µA @ 400 V). The primary advantages are active product status and ROHS3 compliance. Selection between these two variants depends on packaging requirements: VS-20ETF04STRL-M3 and VS-20ETF04STRR-M3 are both supplied in Tape & Reel format. These are the preferred direct replacements for the obsolete 20ETF04S.

Manufacturer Recommended Alternative - Rohm RFUH20NS3STL:

The RFUH20NS3STL is a Rohm Semiconductor alternative that maintains the 20 A current rating and fast recovery classification. This part operates at a lower voltage rating of 350 V, which is acceptable only for applications where the maximum reverse voltage does not exceed 350 V. The RFUH20NS3STL exhibits superior reverse recovery characteristics (25 ns vs. 160 ns) and lower reverse leakage current (10 µA @ 350 V vs. 100 µA @ 400 V). Forward voltage is slightly higher at 1.5 V @ 20 A. This part is suitable for designs with reduced voltage stress margins and where improved switching performance is beneficial.

Manufacturer Recommended Alternatives - STMicroelectronics STTH30R04G and STTH30R04G-TR:

The STTH30R04G and STTH30R04G-TR are STMicroelectronics parts with enhanced current ratings of 30 A, exceeding the 20 A requirement of the 20ETF04S. Both maintain the 400 V voltage rating and fast recovery classification. These parts feature improved reverse recovery time (100 ns vs. 160 ns) and significantly lower reverse leakage current (15 µA @ 400 V vs. 100 µA @ 400 V). The extended operating temperature range (-40°C to 175°C vs. -40°C to 150°C) provides additional thermal margin. Selection between STTH30R04G (Tube packaging) and STTH30R04G-TR (Cut Tape & Digi-Reel packaging) depends on procurement and assembly requirements. These parts are suitable for applications requiring higher current capacity or improved thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the VS-20ETF04STRL-M3 or VS-20ETF04STRR-M3 be used as direct replacements for the 20ETF04S?

A: Yes. Both Vishay parts are parametric equivalents with identical electrical specifications and package form factor. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). These parts are suitable for direct substitution in existing designs.

Q: What is the difference between VS-20ETF04STRL-M3 and VS-20ETF04STRR-M3?

A: Both parts are electrically identical. The difference lies in packaging designation: VS-20ETF04STRL-M3 and VS-20ETF04STRR-M3 are both supplied in Tape & Reel format. Selection depends on specific procurement and assembly line requirements.

Q: Can the RFUH20NS3STL be used in all applications where the 20ETF04S is specified?

A: The RFUH20NS3STL is suitable only for applications where the maximum reverse voltage does not exceed 350 V. The 20ETF04S is rated for 400 V. If the application requires the full 400 V rating, the RFUH20NS3STL is not appropriate. However, for designs with 350 V or lower voltage stress, the RFUH20NS3STL offers superior reverse recovery characteristics and lower leakage current.

Q: What are the advantages of the STMicroelectronics STTH30R04G over the 20ETF04S?

A: The STTH30R04G provides higher current capacity (30 A vs. 20 A), faster reverse recovery (100 ns vs. 160 ns), lower reverse leakage current (15 µA vs. 100 µA), and an extended operating temperature range (-40°C to 175°C vs. -40°C to 150°C). These improvements result in better thermal performance and switching efficiency.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (VS-20ETF04STRL-M3, VS-20ETF04STRR-M3, RFUH20NS3STL, STTH30R04G, and STTH30R04G-TR) are ROHS3 compliant. The original 20ETF04S is RoHS non-compliant.

Q: What packaging options are available for these substitute parts?

A: Vishay parts are supplied in Tape & Reel format. Rohm RFUH20NS3STL is supplied in Tape & Reel format. STMicroelectronics STTH30R04G is supplied in Tube packaging, while STTH30R04G-TR is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Can the STTH30R04G-TR be used interchangeably with STTH30R04G?

A: Yes, electrically and mechanically. Both parts are identical in specifications. The difference is packaging format: STTH30R04G is supplied in Tube, while STTH30R04G-TR is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly line requirements and handling preferences.

Q: What is the impact of the higher forward voltage in the RFUH20NS3STL (1.5 V vs. 1.3 V)?

A: The 0.2 V difference in forward voltage results in slightly higher power dissipation during conduction. For a 20 A load, this represents an additional 4 W of dissipation. This is acceptable in most applications but should be verified in designs with tight thermal budgets.

Q: Are there any compliance or certification differences between the substitute parts?

A: All substitute parts share identical REACH, ECCN (EAR99), and HTSUS classifications with the original 20ETF04S. All are ROHS3 compliant, whereas the 20ETF04S is RoHS non-compliant. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts.

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