FESB8GTHE3_A/I Equivalent & Substitute Parts

Part Overview

The FESB8GTHE3_A/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V DC reverse voltage and 8 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to ensure continued design support and procurement availability for applications requiring 400 V / 8 A rectification performance with automotive-grade qualification.

Substiute Parts

FESB8GTHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 747FESB8GTHE3_A/I Datasheet

Current PartRFQ

FESB8GTHM3/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1082FESB8GTHM3/I Datasheet

MFR RecommendedRFQ

STTH8R06GY-TR

STMicroelectronicsIn Stock: 3153STTH8R06GY-TR Datasheet

MFR RecommendedRFQ

SDURB840

SMC Diode SolutionsIn Stock: 1618SDURB840 Datasheet

Parametric EquivalentRFQ

SFAS806G

Taiwan Semiconductor CorporationIn Stock: 2533SFAS806G Datasheet

Parametric EquivalentRFQ

SFAS806GH

Taiwan Semiconductor CorporationIn Stock: 2456SFAS806GH Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FESB8GTHE3_A/I are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Parametric Equivalents (400 V / 8 A)

Parts in this category maintain identical or superior electrical performance within the 400 V reverse voltage and 8 A current rating. These parts are interchangeable in applications where the original specifications are required. Key matching parameters include:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 8 A
• Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 8 A
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Mounting Type: Surface Mount
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Category 2: Higher Voltage Rated Alternative (600 V / 8 A)

The STTH8R06GY-TR operates at 600 V reverse voltage with the same 8 A current rating. This part is suitable for applications where higher voltage margin is acceptable or required. Selection of this part requires verification that the application circuit can accommodate the higher forward voltage drop (3.2 V vs. 1.3 V).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: FESB8GTHM3/I

The FESB8GTHM3/I is the manufacturer-recommended direct substitute from Vishay General Semiconductor - Diodes Division. This part maintains identical electrical specifications (400 V, 8 A, 1.3 V forward voltage) and package configuration. Both parts carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance. The FESB8GTHM3/I is in Active product status with higher inventory availability (973 pcs vs. 709 pcs for the original part).

Secondary Recommendations: SFAS806GH

The SFAS806GH from Taiwan Semiconductor Corporation provides parametric equivalence with automotive-grade qualification (AEC-Q101) and identical electrical specifications. This part offers improved reverse recovery time (35 ns vs. 50 ns) and is in Active product status with substantial inventory (2372 pcs).

Alternative Recommendation: SFAS806G

The SFAS806G from Taiwan Semiconductor Corporation is a parametric equivalent without automotive-grade designation. This part is suitable for non-automotive applications requiring 400 V / 8 A performance. It shares identical electrical specifications with SFAS806GH and offers the same improved reverse recovery time (35 ns).

Supplementary Option: SDURB840

The SDURB840 from SMC Diode Solutions provides parametric equivalence with 400 V / 8 A specifications and improved reverse recovery time (45 ns). This part does not carry automotive-grade qualification and has REACH Affected status. Selection is appropriate for non-automotive applications where automotive qualification is not required.

Higher Voltage Alternative: STTH8R06GY-TR

The STTH8R06GY-TR from STMicroelectronics operates at 600 V reverse voltage with 8 A current rating. This part is suitable only for applications where higher voltage margin is acceptable. The significantly higher forward voltage drop (3.2 V vs. 1.3 V) results in increased power dissipation and thermal load. This part carries automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40 to 175°C).

Frequently Asked Questions (FAQ)

Q: Can FESB8GTHM3/I be used as a direct replacement for FESB8GTHE3_A/I?

A: Yes. The FESB8GTHM3/I is the manufacturer-recommended substitute with identical electrical specifications, package configuration, and automotive qualification. Both parts are rated for 400 V reverse voltage, 8 A average rectified current, and 1.3 V forward voltage drop at 8 A. The primary difference is product status: FESB8GTHE3_A/I is Last Time Buy while FESB8GTHM3/I is Active.

Q: What is the difference between SFAS806G and SFAS806GH?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications (400 V, 8 A, 1.3 V forward voltage, 35 ns reverse recovery time). The primary difference is qualification: SFAS806GH carries automotive-grade qualification (AEC-Q101) while SFAS806G does not. Selection depends on application requirements for automotive compliance.

Q: Can STTH8R06GY-TR replace FESB8GTHE3_A/I in all applications?

A: No. While STTH8R06GY-TR maintains the same 8 A current rating and D2PAK package, it operates at 600 V reverse voltage with 3.2 V forward voltage drop compared to 400 V and 1.3 V for the original part. The higher forward voltage drop increases power dissipation and thermal load. This part is suitable only for applications where higher voltage rating is acceptable or required and where the increased forward voltage drop does not exceed thermal design limits.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-263-3 D2PAK (2 Leads + Tab) surface mount package, identical to the original FESB8GTHE3_A/I. This ensures mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Q: Which substitute part has the fastest reverse recovery time?

A: Both SFAS806G and SFAS806GH from Taiwan Semiconductor Corporation have the fastest reverse recovery time at 35 ns, compared to 50 ns for the original FESB8GTHE3_A/I. This faster recovery reduces switching losses in high-frequency applications.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. Parts carrying this qualification meet automotive industry reliability and quality requirements. For automotive applications, selection of AEC-Q101 qualified parts (FESB8GTHM3/I, SFAS806GH, or STTH8R06GY-TR) is required.

Q: Does REACH status affect part selection?

A: REACH status indicates regulatory compliance with European chemical regulations. The original FESB8GTHE3_A/I and most substitute parts are REACH Unaffected or REACH Compliant. SDURB840 is REACH Affected, which may require additional documentation for European supply chains. Selection should consider regional regulatory requirements.

Q: What inventory levels are available for each substitute?

A: Current inventory levels are: FESB8GTHM3/I (973 pcs), STTH8R06GY-TR (3100 pcs), SDURB840 (1561 pcs), SFAS806G (2506 pcs), and SFAS806GH (2372 pcs). These levels support procurement planning for volume production requirements.