FESB8FTHE3_A/I Equivalent & Substitute Parts

Part Overview

The FESB8FTHE3_A/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 300 V DC reverse voltage and 8 A average rectified current in a surface mount TO-263AB (D2PAK) package. This component is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Equivalent and substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring general-purpose rectification in automotive and industrial environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 8 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10 @ 300 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FESB8FTHE3_A/I are classified based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 300 V
Current - Average Rectified (Io): Equal to or greater than 8 A
Voltage - Forward (Vf) (Max) @ If: Equal to or less than 1.3 V at rated current
Reverse Recovery Time (trr): Equal to or less than 50 ns
Current - Reverse Leakage @ Vr: Equal to or less than 10 µA at rated voltage
Package / Case: TO-263-3 D2PAK or equivalent surface mount package
Mounting Type: Surface Mount
Operating Temperature - Junction: Range must encompass -55°C to 150°C minimum
Grade: Automotive qualification preferred
Qualification: AEC-Q101 compliance preferred

Substitution Categories:

Parametric Equivalents (Identical Electrical and Mechanical Specifications): Parts meeting all primary criteria with matching voltage, current, and package specifications.

Manufacturer Recommended Alternatives (Enhanced Specifications): Parts with superior voltage ratings or current capabilities while maintaining package compatibility and thermal performance.

Cross-Manufacturer Equivalents (Different Manufacturer, Matched Specifications): Parts from alternative manufacturers meeting identical electrical and mechanical parameters.

Parameter Comparison

Parameter	FESB8FTHE3_A/I (Main)	FESB8GTHM3/I	STTH1003SBY-TR	SDURB830	SFAS805G	SFAS805GH
Manufacturer	Vishay	Vishay	STMicroelectronics	SMC Diode Solutions	Taiwan Semiconductor	Taiwan Semiconductor
Voltage - DC Reverse (Vr) (Max)	300 V	400 V	300 V	300 V	300 V	300 V
Current - Average Rectified (Io)	8 A	8 A	10 A	8 A	8 A	8 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 8 A	1.3 V @ 8 A	1.3 V @ 10 A	1.3 V @ 8 A	1.3 V @ 8 A	1.3 V @ 8 A
Reverse Recovery Time (trr)	50 ns	50 ns	35 ns	45 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 300 V	10 µA @ 400 V	10 µA @ 300 V	10 µA @ 300 V	10 µA @ 300 V	10 µA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-252-3, DPAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-40 to 175°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Grade	Automotive	Automotive	Automotive	Not specified	Not specified	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	Not specified	Not specified	AEC-Q101
Product Status	Last Time Buy	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FESB8GTHM3/I (Vishay General Semiconductor - Diodes Division)

This manufacturer-recommended alternative provides enhanced voltage rating (400 V) while maintaining identical current capacity (8 A) and forward voltage characteristics. The part is in Active product status with superior inventory availability (973 pcs). It maintains identical package specifications (TO-263AB D2PAK), thermal range (-55°C to 150°C), automotive grade, and AEC-Q101 qualification. This part is suitable for applications requiring higher voltage margin or where supply continuity is critical.

STTH1003SBY-TR (STMicroelectronics)

This cross-manufacturer substitute offers enhanced current capacity (10 A versus 8 A) at identical voltage rating (300 V). The part features improved reverse recovery time (35 ns versus 50 ns), indicating faster switching performance. Operating temperature range extends to 175°C maximum junction temperature. Package differs to DPAK (TO-252-3) instead of D2PAK, requiring PCB layout modification. The part maintains automotive grade and AEC-Q101 qualification with high inventory availability (2700 pcs). Selection requires verification of PCB footprint compatibility.

SDURB830 (SMC Diode Solutions)

This parametric equivalent matches the main part specifications exactly: 300 V voltage rating, 8 A current capacity, 1.3 V forward voltage, and TO-263AB D2PAK package. Reverse recovery time is slightly improved (45 ns versus 50 ns). Operating temperature range and RoHS compliance are identical. The part is in Active product status with substantial inventory (1405 pcs). REACH status is listed as Affected, requiring compliance verification for specific applications. No automotive grade or AEC-Q101 qualification is specified.

SFAS805G (Taiwan Semiconductor Corporation)

This parametric equivalent provides identical electrical specifications (300 V, 8 A, 1.3 V forward voltage) and package configuration (TO-263AB D2PAK). Reverse recovery time is improved (35 ns versus 50 ns). Capacitance specification is provided (60 pF @ 4V, 1MHz). The part is in Active product status with high inventory (2658 pcs). No automotive grade or AEC-Q101 qualification is specified. RoHS3 compliance and unlimited moisture sensitivity level are confirmed.

SFAS805GH (Taiwan Semiconductor Corporation)

This parametric equivalent matches SFAS805G specifications with the addition of automotive grade and AEC-Q101 qualification. Electrical parameters are identical to the main part (300 V, 8 A, 1.3 V forward voltage). Package is TO-263AB D2PAK with identical thermal range (-55°C to 150°C). Reverse recovery time is improved (35 ns). The part is in Active product status with high inventory (2534 pcs). This part provides the closest functional match to the main part with active supply status and full automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can FESB8GTHM3/I be used as a direct replacement for FESB8FTHE3_A/I?

A: Yes. FESB8GTHM3/I is a manufacturer-recommended substitute with identical current rating (8 A), forward voltage (1.3 V @ 8 A), package (TO-263AB D2PAK), and thermal range (-55°C to 150°C). The 400 V voltage rating exceeds the 300 V requirement, providing additional voltage margin. Both parts maintain automotive grade and AEC-Q101 qualification.

Q: What is the difference between STTH1003SBY-TR and the main part?

A: STTH1003SBY-TR differs in three aspects: (1) Current capacity is increased to 10 A versus 8 A; (2) Reverse recovery time is improved to 35 ns versus 50 ns; (3) Package is DPAK (TO-252-3) instead of D2PAK (TO-263AB), requiring PCB footprint modification. Voltage rating remains 300 V. Operating temperature maximum extends to 175°C.

Q: Are SFAS805G and SFAS805GH interchangeable?

A: SFAS805G and SFAS805GH have identical electrical specifications and package configuration. The primary difference is that SFAS805GH includes automotive grade designation and AEC-Q101 qualification, while SFAS805G does not specify these qualifications. For automotive applications requiring AEC-Q101 compliance, SFAS805GH is the appropriate selection.

Q: Can SDURB830 be used in automotive applications?

A: SDURB830 meets the electrical and package requirements of the main part (300 V, 8 A, TO-263AB D2PAK). However, automotive grade and AEC-Q101 qualification are not specified for this part. Application suitability depends on specific automotive qualification requirements. REACH status is listed as Affected, requiring compliance verification.

Q: What is the significance of the reverse recovery time differences?

A: Reverse recovery time (trr) indicates the speed at which a diode transitions from conducting to blocking state. The main part specifies 50 ns. Substitute parts with lower trr values (35 ns for STTH1003SBY-TR, SFAS805G, and SFAS805GH; 45 ns for SDURB830) provide faster switching performance, reducing switching losses and electromagnetic interference in high-frequency applications.

Q: Is package compatibility critical when selecting a substitute?

A: Package compatibility is critical for PCB assembly. FESB8FTHE3_A/I, FESB8GTHM3/I, SDURB830, SFAS805G, and SFAS805GH all use TO-263AB D2PAK package with identical pinout and footprint. STTH1003SBY-TR uses DPAK (TO-252-3) package, which has a different footprint and requires PCB modification. Direct substitution without layout changes is possible only with D2PAK packaged parts.

Q: What inventory considerations apply to these substitutes?

A: The main part FESB8FTHE3_A/I is Last Time Buy status with 843 pcs available. All substitute parts are in Active product status with higher inventory: FESB8GTHM3/I (973 pcs), STTH1003SBY-TR (2700 pcs), SDURB830 (1405 pcs), SFAS805G (2658 pcs), and SFAS805GH (2534 pcs). Active status parts provide long-term supply continuity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant. The main part FESB8FTHE3_A/I is also ROHS3 Compliant. All parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Which substitute part is recommended for new designs?

A: For new designs requiring identical specifications with active supply status and full automotive qualification, SFAS805GH is recommended. It provides parametric equivalence to the main part (300 V, 8 A, 1.3 V forward voltage, TO-263AB D2PAK), improved reverse recovery time (35 ns), automotive grade, AEC-Q101 qualification, and high inventory availability (2534 pcs).

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