FESB8ATHE3_A/I Equivalent & Substitute Parts

Part Overview

The FESB8ATHE3_A/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount device is rated for 50 V DC reverse voltage and 8 A average rectified current in a TO-263AB (D2PAK) package. The part is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 8 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FESB8ATHE3_A/I are classified into two categories based on electrical parameter compatibility:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 50 V reverse voltage rating, 8 A average rectified current, 950 mV forward voltage drop at 8 A, 35 ns reverse recovery time, and 10 µA reverse leakage current at rated voltage. These parts are interchangeable in applications where the original voltage and current ratings are required. Parametric equivalents include SFAS801G MNG and SFAS801GHMNG from Taiwan Semiconductor Corporation.

Manufacturer Recommended Substitute (FESB8DTHM3/I) shares the same 8 A current rating and identical forward voltage, recovery time, and leakage characteristics, but features an elevated 200 V reverse voltage rating. This part is suitable for applications requiring higher voltage margin or where circuit topology permits operation at higher voltage ratings without performance degradation.

All substitute parts maintain identical package configuration (TO-263AB D2PAK), mounting type (surface mount), operating temperature range (-55°C to 150°C), and automotive-grade qualification (AEC-Q101).

Parameter Comparison

Parameter	FESB8ATHE3_A/I	FESB8DTHM3/I	SFAS801G MNG	SFAS801GHMNG
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	50 V	200 V	50 V	50 V
Current - Average Rectified (Io)	8 A	8 A	8 A	8 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 8 A	950 mV @ 8 A	950 mV @ 8 A	950 mV @ 8 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 200 V	10 µA @ 50 V	10 µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-263AB (D2PAK)	TO-263AB (D2PAK)	TO-263AB (D2PAK)	TO-263AB (D2PAK)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Grade	Automotive	Automotive	Not specified	Automotive
Qualification	AEC-Q101	AEC-Q101	Not specified	AEC-Q101
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

SFAS801GHMNG is the preferred parametric equivalent. This part maintains all electrical specifications identical to the FESB8ATHE3_A/I while offering active product status and full automotive qualification (AEC-Q101). The part carries ROHS3 compliance and MSL 1 rating, matching the original device specifications. Current inventory of 943 pieces supports production requirements.

SFAS801G MNG provides parametric equivalence with identical electrical performance. However, automotive grade and AEC-Q101 qualification are not specified for this variant. This part is suitable for non-automotive applications or where automotive qualification is not required. Current inventory of 793 pieces is available.

For Higher Voltage Applications:

FESB8DTHM3/I is the manufacturer-recommended substitute when circuit design permits operation at elevated voltage ratings. The 200 V reverse voltage rating provides increased voltage margin while maintaining identical current handling (8 A), forward voltage drop (950 mV @ 8 A), and recovery characteristics (35 ns trr). This part carries active product status, automotive grade, and AEC-Q101 qualification. Current inventory of 888 pieces is available.

Selection Criteria:

For automotive applications requiring direct replacement, select SFAS801GHMNG. For non-automotive applications, SFAS801G MNG is acceptable. For designs requiring higher voltage headroom, select FESB8DTHM3/I. All substitute parts are surface mount compatible with existing TO-263AB footprints and require no PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SFAS801G MNG be used in automotive applications?

A: SFAS801G MNG lacks specified automotive grade and AEC-Q101 qualification. For automotive applications, use SFAS801GHMNG or FESB8DTHM3/I, both of which carry AEC-Q101 qualification.

Q: What is the difference between SFAS801G MNG and SFAS801GHMNG?

A: Both parts are parametric equivalents with identical electrical specifications (50 V, 8 A, 950 mV Vf, 35 ns trr). SFAS801GHMNG includes automotive grade designation and AEC-Q101 qualification, while SFAS801G MNG does not specify these qualifications.

Q: Can FESB8DTHM3/I be used as a direct replacement for FESB8ATHE3_A/I?

A: FESB8DTHM3/I is electrically compatible for applications operating at or below 50 V. The 200 V rating provides additional voltage margin. All other electrical parameters (current, forward voltage, recovery time, leakage) are identical. Package and mounting are identical. This part is suitable for direct replacement in 50 V applications.

Q: Are all substitute parts RoHS compliant?

A: SFAS801G MNG, SFAS801GHMNG, and the original FESB8ATHE3_A/I are ROHS3 compliant. FESB8DTHM3/I RoHS status is not specified in available data.

Q: Do substitute parts require PCB layout changes?

A: No. All substitute parts use identical TO-263AB (D2PAK) package configuration with the same pinout and thermal tab. No PCB modifications are required.

Q: What is the moisture sensitivity level for substitute parts?

A: SFAS801G MNG and SFAS801GHMNG both carry MSL 1 (Unlimited), matching the original part. FESB8DTHM3/I MSL rating is not specified.

Q: Which substitute part has the highest current inventory?

A: SFAS801GHMNG has 943 pieces in stock, followed by FESB8DTHM3/I with 888 pieces and SFAS801G MNG with 793 pieces.

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