Equivalent & Substitute Parts for 20ETF12FP

Part Overview

The Vishay 20ETF12FP is a general-purpose rectifier diode rated for 1200 V DC reverse voltage and 20 A average rectified current in a Through Hole TO-220AC Full Pack configuration. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	1200 V
Current - Average Rectified (Io)	20 A
Voltage - Forward (Vf) (Max) @ If	1.31 V @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	400 ns
Current - Reverse Leakage @ Vr	100 µA @ 1200 V
Mounting Type	Through Hole
Package / Case	TO-220-2 Full Pack
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 20ETF12FP rectifier diode is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must maintain the 1200 V DC reverse voltage specification to ensure safe operation within the intended circuit voltage envelope.

Current Rating Consideration: The 20 A average rectified current rating is the primary load-carrying specification. Equivalent parts maintain this rating, while substitute parts may operate at reduced current ratings (5 A or 8 A) and are suitable only for applications with lower current demands.

Package and Mounting: All candidates utilize Through Hole mounting in TO-220-2 Full Pack or TO-220FPAC configurations, ensuring mechanical and thermal interface compatibility.

Recovery Characteristics: Fast recovery operation (≤ 500ns) is maintained across all substitute options, supporting high-frequency switching applications.

Compliance Status: The original 20ETF12FP is RoHS non-compliant and obsolete. Active substitute parts provide RoHS3 compliance and current product status for new designs and long-term availability.

Parameter Comparison

Parameter	20ETF12FP (Main)	VS-20ETF12FP-M3 (Equivalent)	STTH512FP (Substitute)	STTH812FP (Substitute)
Manufacturer	Vishay	Vishay	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	1200 V	1200 V	1200 V	1200 V
Current - Average Rectified (Io)	20 A	20 A	5 A	8 A
Voltage - Forward (Vf) (Max) @ If	1.31 V @ 20 A	1.31 V @ 20 A	2.2 V @ 5 A	2.2 V @ 8 A
Speed	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Reverse Recovery Time (trr)	400 ns	400 ns	95 ns	100 ns
Current - Reverse Leakage @ Vr	100 µA @ 1200 V	100 µA @ 1200 V	5 µA @ 1200 V	8 µA @ 1200 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Full Pack	TO-220-2 Full Pack	TO-220-2 Full Pack, Isolated Tab	TO-220-2 Full Pack, Isolated Tab
Operating Temperature - Junction (Max)	150°C	150°C	175°C	175°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Parametric Match):

The VS-20ETF12FP-M3 from Vishay General Semiconductor - Diodes Division is the parametric equivalent to the 20ETF12FP. This part maintains identical electrical specifications including 1200 V reverse voltage, 20 A average rectified current, 1.31 V forward voltage at 20 A, and 400 ns reverse recovery time. The VS-20ETF12FP-M3 is currently active in production with RoHS3 compliance and Tube packaging, providing direct functional replacement with improved regulatory status and supply continuity.

Current-Reduced Substitutes (STMicroelectronics):

The STTH512FP and STTH812FP from STMicroelectronics are manufacturer-recommended substitutes for applications where the full 20 A current rating is not required. Both parts maintain the 1200 V reverse voltage specification and fast recovery characteristics. The STTH512FP operates at 5 A average rectified current, while the STTH812FP operates at 8 A. These parts feature improved reverse recovery times (95 ns and 100 ns respectively) and lower reverse leakage currents compared to the original 20ETF12FP. Both are RoHS3 compliant with active product status and higher maximum junction temperature ratings (175°C).

Compliance and Availability:

For new designs and applications requiring regulatory compliance, the VS-20ETF12FP-M3 or STMicroelectronics substitutes are recommended due to RoHS3 compliance and active product status. The original 20ETF12FP, classified as obsolete and RoHS non-compliant, should not be specified for new designs.

Frequently Asked Questions (FAQ)

Q: Can the VS-20ETF12FP-M3 be used as a direct replacement for the 20ETF12FP?

A: Yes. The VS-20ETF12FP-M3 is a parametric equivalent with identical electrical specifications (1200 V, 20 A, 1.31 V forward voltage, 400 ns recovery time) and compatible Through Hole TO-220-2 Full Pack mounting. The primary difference is improved RoHS3 compliance and active product status.

Q: What is the difference between the VS-20ETF12FP-M3 and the STMicroelectronics STTH512FP or STTH812FP?

A: The VS-20ETF12FP-M3 maintains the full 20 A current rating. The STTH512FP and STTH812FP are current-reduced substitutes rated for 5 A and 8 A respectively. These STMicroelectronics parts feature faster recovery times (95-100 ns versus 400 ns) and lower reverse leakage. Selection depends on application current requirements.

Q: Are the STMicroelectronics STTH512FP and STTH812FP suitable for all applications using the 20ETF12FP?

A: No. These parts are suitable only for applications where the average rectified current does not exceed 5 A (STTH512FP) or 8 A (STTH812FP). Applications requiring the full 20 A rating must use the VS-20ETF12FP-M3 equivalent.

Q: What is the significance of the isolated tab in the STMicroelectronics package?

A: The isolated tab in the TO-220FPAC package provides electrical isolation between the tab and the semiconductor junction, reducing thermal coupling to the mounting surface. This is a package design feature that does not affect electrical substitution compatibility but may influence thermal management in specific circuit layouts.

Q: Is the 20ETF12FP still available for procurement?

A: The 20ETF12FP is classified as obsolete. While inventory may exist from legacy stock (708 Pcs noted), new procurement should specify the active equivalent VS-20ETF12FP-M3 or appropriate STMicroelectronics substitutes to ensure long-term supply continuity and regulatory compliance.

Q: Do all substitute parts maintain fast recovery operation?

A: Yes. All substitute parts (VS-20ETF12FP-M3, STTH512FP, STTH812FP) maintain fast recovery operation with recovery times ≤ 500ns, supporting high-frequency switching applications.

Q: What is the operating temperature range difference between the 20ETF12FP and the STMicroelectronics substitutes?

A: The 20ETF12FP operates to a maximum junction temperature of 150°C. The STMicroelectronics STTH512FP and STTH812FP operate to 175°C maximum junction temperature, providing improved thermal margin in high-temperature environments.

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