FESB8HT-E3/81 Equivalent & Substitute Parts

Part Overview

The FESB8HT-E3/81 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 500 V DC reverse voltage with an 8 A average rectified current rating in a TO-263AB (D2PAK) package. The device is classified as Last Time Buy, indicating discontinued production status. Identification of equivalent and substitute parts is necessary to ensure continued design support and procurement availability for applications requiring this diode specification or compatible alternatives.

Substiute Parts

FESB8HT-E3/81

Vishay General Semiconductor - Diodes DivisionIn Stock: 1018FESB8HT-E3/81 Datasheet

Current PartRFQ

FESB8JT-M3/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 869FESB8JT-M3/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FESB8HT-E3/81 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed the original specification (500 V minimum)
• Current - Average Rectified (Io) must equal or exceed 8 A
• Voltage - Forward (Vf) must not exceed the original specification at rated current
• Reverse Recovery Time (trr) must not exceed 50 ns
• Current - Reverse Leakage must not exceed 10 µA at rated voltage

Mechanical Compatibility Criteria:

• Package / Case must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Mounting Type must be Surface Mount
• Operating Temperature range must encompass -55°C to 150°C

Compliance Criteria:

• RoHS3 Compliance required

The FESB8JT-M3/I meets all substitution criteria with enhanced voltage rating and active product status.

Parameter Comparison

Engineering Selection Recommendations

The FESB8JT-M3/81 is a direct substitute for the FESB8HT-E3/81 based on the following factors:

Electrical Performance: The substitute part maintains identical forward voltage drop, reverse recovery time, and reverse leakage current specifications. The increased DC reverse voltage rating (600 V versus 500 V) provides enhanced overvoltage margin without degrading performance in 500 V applications.

Package Compatibility: Both parts utilize the TO-263AB (D2PAK) surface mount package with identical pinout and thermal characteristics, enabling direct PCB layout compatibility.

Product Status: The FESB8JT-M3/I carries Active product status, ensuring long-term availability and supply chain continuity compared to the Last Time Buy status of the original part.

Compliance: Both parts meet ROHS3 compliance requirements, supporting regulatory and environmental standards.

Automotive Grade: The substitute part carries AEC-Q101 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the FESB8JT-M3/I be used as a direct replacement for the FESB8HT-E3/81 in existing designs?

A: Yes. The substitute part is electrically and mechanically compatible. Identical forward voltage, reverse recovery time, and current ratings ensure equivalent circuit performance. The TO-263AB package pinout is identical, permitting direct PCB substitution without layout modification.

Q: What is the significance of the higher 600 V rating on the substitute part?

A: The 600 V DC reverse voltage rating on the FESB8JT-M3/I exceeds the 500 V specification of the original part. This provides additional safety margin against transient overvoltages and voltage spikes in the application. The substitute part operates within the original 500 V design envelope while offering enhanced robustness.

Q: Are there any thermal or performance differences between these parts?

A: No. Both parts share identical operating temperature range (-55°C to 150°C), forward voltage characteristics, and reverse recovery time specifications. Thermal performance in the TO-263AB package is equivalent.

Q: Why is the FESB8JT-M3/I listed as Active while the original part is Last Time Buy?

A: The FESB8HT-E3/81 has reached end-of-life status, with production discontinued. The FESB8JT-M3/I remains in active production, ensuring continued availability for new designs and replacement procurement.

Q: Does the AEC-Q101 qualification on the substitute part affect its use in non-automotive applications?

A: No. AEC-Q101 qualification indicates automotive-grade reliability testing and is applicable to all applications. Non-automotive designs benefit from the enhanced reliability assurance without any performance penalty.

Q: Are the reverse leakage current specifications directly comparable between the two parts?

A: The specifications are comparable within engineering tolerance. The original part specifies 10 µA leakage at 500 V, while the substitute specifies 10 µA at 600 V. Leakage current measured at higher voltage represents a more stringent specification, confirming compatibility.