Equivalent & Substitute Parts for 20ETS12FP

Part Overview

The Vishay 20ETS12FP is a general-purpose rectifier diode rated for 1200 V DC reverse voltage and 20 A average rectified current in a TO-220AC Full Pack through-hole package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

20ETS12FP

Vishay General Semiconductor - Diodes DivisionIn Stock: 71020ETS12FP Datasheet

Current PartRFQ

STTH512FP

STMicroelectronicsIn Stock: 16130STTH512FP Datasheet

MFR RecommendedRFQ

STTH812DI

STMicroelectronicsIn Stock: 7154STTH812DI Datasheet

MFR RecommendedRFQ

STTH812FP

STMicroelectronicsIn Stock: 1340STTH812FP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 20ETS12FP is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts maintain the 1200 V DC reverse voltage specification, ensuring electrical compatibility in high-voltage applications.

Current Rating Consideration: The 20ETS12FP operates at 20 A average rectified current. The substitute parts listed (STTH512FP, STTH812DI, STTH812FP) have lower current ratings of 5 A and 8 A respectively. These substitutes are suitable only for applications where the actual circuit current demand does not exceed the substitute part's rating.

Package and Mounting: All substitute parts utilize through-hole mounting in TO-220 package variants (TO-220FPAC or TO-220AC), maintaining mechanical compatibility with existing PCB layouts and thermal management designs.

Recovery Speed: The 20ETS12FP employs standard recovery characteristics (>500ns). The substitute parts feature fast recovery characteristics (≤500ns), which represents an improvement in switching performance and reduced reverse recovery losses.

Compliance Status: The 20ETS12FP is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current regulatory requirements for new designs and manufacturing.

Parameter Comparison

Engineering Selection Recommendations

For Direct Current Capacity Replacement: No substitute part listed maintains the full 20 A current rating of the 20ETS12FP. Applications requiring the complete 20 A capacity cannot use the provided substitutes without circuit redesign or parallel configuration.

For Reduced Current Applications: The STTH812DI and STTH812FP are suitable for applications where circuit current does not exceed 8 A. Both parts maintain 1200 V voltage rating and through-hole TO-220 mounting compatibility. The STTH812FP offers isolated tab packaging (TO-220FPAC), while STTH812DI provides insulated packaging (TO-220AC ins).

For Minimum Current Applications: The STTH512FP is suitable for applications where circuit current does not exceed 5 A, with identical voltage rating and through-hole mounting.

Compliance Advantage: All substitute parts are ROHS3 compliant and active products, addressing the obsolescence and regulatory non-compliance status of the 20ETS12FP. All substitute parts feature improved reverse recovery characteristics (fast recovery ≤500ns versus standard recovery >500ns), resulting in reduced switching losses and improved thermal performance.

Temperature Rating Improvement: Substitute parts operate to 175°C maximum junction temperature, compared to 150°C for the 20ETS12FP, providing enhanced thermal margin in high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the STTH812FP directly replace the 20ETS12FP in all applications?

A: The STTH812FP maintains voltage rating and through-hole TO-220 mounting compatibility. However, it is rated for 8 A average rectified current versus the 20ETS12FP's 20 A rating. Direct replacement is only suitable for applications where actual circuit current does not exceed 8 A.

Q: What is the difference between STTH812DI and STTH812FP?

A: Both parts share identical electrical specifications (1200 V, 8 A, fast recovery). The primary difference is packaging: STTH812DI uses TO-220AC insulated tab configuration, while STTH812FP uses TO-220FPAC full pack with isolated tab. Package selection depends on thermal management requirements and PCB layout constraints.

Q: Why do the substitute parts have higher forward voltage drops?

A: The substitute parts specify 2.2 V forward voltage at their respective current ratings (5 A or 8 A), compared to 1.1 V for the 20ETS12FP at 20 A. Forward voltage is current-dependent and cannot be directly compared across different current levels. At equivalent current densities, the fast recovery technology of substitute parts may exhibit different forward voltage characteristics.

Q: Are the substitute parts suitable for new product designs?

A: Yes. All substitute parts are active products with ROHS3 compliance, making them appropriate for new designs. The improved recovery characteristics and higher maximum junction temperature provide design advantages over the obsolete 20ETS12FP.

Q: What is the impact of fast recovery versus standard recovery?

A: Fast recovery (≤500ns) reduces reverse recovery losses and switching noise compared to standard recovery (>500ns). This results in lower power dissipation, reduced EMI, and improved efficiency in switching applications.

Q: Can multiple substitute parts be paralleled to achieve 20 A capacity?

A: Paralleling diodes requires careful consideration of current sharing, thermal management, and reverse recovery characteristics. This approach is outside the scope of direct substitution and requires detailed circuit analysis.

Q: Is the isolated tab feature of STTH812FP important for my application?

A: The isolated tab (TO-220FPAC) provides electrical isolation between the tab and the semiconductor junction, useful in applications where the tab is used for heat sinking to a common ground plane. The insulated tab (TO-220AC ins) of STTH812DI provides similar isolation. Selection depends on thermal design and grounding requirements.