FESB8CTHE3_A/I Equivalent & Substitute Parts

Part Overview

The FESB8CTHE3_A/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 150 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. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 8 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	10 µA @ 150 V	µA
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	°C
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the FESB8CTHE3_A/I are classified into two categories based on electrical and mechanical compatibility:

Category 1: Manufacturer Recommended Upgrade (Higher Voltage Rating) The FESB8DTHM3/I is a direct upgrade from Vishay General Semiconductor - Diodes Division with identical current rating (8 A), identical forward voltage characteristics (950 mV @ 8 A), identical package (TO-263AB), and identical thermal performance (-55°C ~ 150°C). The primary difference is an increased reverse voltage rating of 200 V, providing enhanced voltage margin. This part maintains Active product status and full automotive qualification (AEC-Q101).

Category 2: Parametric Equivalents (Identical Electrical Specifications) The SFAS803G MNG and SFAS803GHMNG from Taiwan Semiconductor Corporation are parametric equivalents matching the FESB8CTHE3_A/I across all critical electrical parameters: 150 V reverse voltage, 8 A current rating, 950 mV forward voltage, 35 ns reverse recovery time, and identical package configuration (TO-263AB). Both maintain Active product status and full automotive qualification (AEC-Q101).

Category 3: Functional Substitute (Different Package, Lower Current Rating) The STPS3150UY from STMicroelectronics is a Schottky diode with identical 150 V reverse voltage rating but reduced current capacity (3 A versus 8 A) and different package (SMB versus TO-263AB). This substitute is applicable only in applications where the 3 A current rating is sufficient.

Substitution logic is based strictly on: reverse voltage rating, average rectified current, forward voltage characteristics, reverse recovery time, package compatibility, operating temperature range, and automotive qualification status.

Parameter Comparison

Parameter	FESB8CTHE3_A/I (Main)	FESB8DTHM3/I	SFAS803G MNG	SFAS803GHMNG	STPS3150UY
Manufacturer	Vishay	Vishay	Taiwan Semiconductor	Taiwan Semiconductor	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	150 V	200 V	150 V	150 V	150 V
Current - Average Rectified (Io)	8 A	8 A	8 A	8 A	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 8 A	950 mV @ 8 A	950 mV @ 8 A	950 mV @ 8 A	820 mV @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	35 ns	≤ 500 ns
Current - Reverse Leakage @ Vr	10 µA @ 150 V	10 µA @ 200 V	10 µA @ 150 V	10 µA @ 150 V	2 µA @ 150 V
Technology	Standard	Standard	Standard	Standard	Schottky
Package / Case	TO-263AB (D2PAK)	TO-263AB (D2PAK)	TO-263AB (D2PAK)	TO-263AB (D2PAK)	SMB (DO-214AA)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 175°C
Grade	Automotive	Automotive	Not specified	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	Not specified	AEC-Q101	Not specified
Product Status	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

The FESB8DTHM3/I, SFAS803G MNG, and SFAS803GHMNG are suitable direct substitutes for the FESB8CTHE3_A/I in applications requiring 8 A rectified current at 150 V reverse voltage with TO-263AB package mounting. All three maintain identical electrical performance and thermal operating range.

The FESB8DTHM3/I provides an upgrade path with increased voltage margin (200 V rating) while maintaining all other specifications. This part carries Active product status and full AEC-Q101 automotive qualification.

The SFAS803GHMNG from Taiwan Semiconductor Corporation provides parametric equivalence with full automotive qualification (AEC-Q101) and Active product status. The SFAS803G MNG variant is also parametrically equivalent but lacks specified automotive grade designation.

Secondary Substitute (Current-Limited Applications)

The STPS3150UY is applicable only in applications where the average rectified current requirement does not exceed 3 A. This Schottky diode offers lower forward voltage (820 mV @ 3 A) and extended upper operating temperature (175°C junction maximum). The SMB package requires different PCB layout and thermal management considerations compared to the TO-263AB package. This part carries Active product status but lacks specified AEC-Q101 qualification.

Compliance Considerations

All substitute parts maintain ROHS3 compliance and EAR99 export classification. The FESB8DTHM3/I, SFAS803GHMNG, and STPS3150UY carry automotive-grade designation. Selection should prioritize parts with specified AEC-Q101 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the FESB8DTHM3/I replace the FESB8CTHE3_A/I in existing designs?

A: Yes. The FESB8DTHM3/I is a direct substitute with identical current rating (8 A), forward voltage (950 mV @ 8 A), reverse recovery time (35 ns), package (TO-263AB), and operating temperature range (-55°C ~ 150°C). The increased reverse voltage rating (200 V versus 150 V) provides additional voltage margin without affecting circuit operation.

Q: What is the difference between the SFAS803G MNG and SFAS803GHMNG?

A: Both parts are parametrically identical with 150 V reverse voltage, 8 A current rating, 950 mV forward voltage, and TO-263AB package. The SFAS803GHMNG carries specified automotive grade and AEC-Q101 qualification, while the SFAS803G MNG does not have these designations specified in the provided data.

Q: Can the STPS3150UY be used as a direct replacement?

A: The STPS3150UY is not a direct replacement due to reduced current capacity (3 A versus 8 A) and different package (SMB versus TO-263AB). This substitute is applicable only in applications where the circuit current requirement does not exceed 3 A and where SMB package mounting is acceptable.

Q: Are all substitute parts automotive-qualified?

A: The FESB8DTHM3/I, SFAS803GHMNG, and STPS3150UY carry automotive-grade designation. The SFAS803G MNG does not have specified automotive grade or AEC-Q101 qualification in the provided data. For automotive applications, selection should prioritize parts with explicit AEC-Q101 qualification.

Q: What is the significance of the Last Time Buy status for the FESB8CTHE3_A/I?

A: Last Time Buy status indicates that the FESB8CTHE3_A/I is no longer in production. Existing inventory is available but will not be replenished. Designs should transition to Active-status alternatives such as the FESB8DTHM3/I, SFAS803G MNG, or SFAS803GHMNG to ensure long-term component availability.

Q: Do the substitute parts have identical thermal characteristics?

A: The FESB8DTHM3/I, SFAS803G MNG, and SFAS803GHMNG maintain identical operating temperature range (-55°C ~ 150°C junction). The STPS3150UY has an extended upper temperature limit (175°C junction maximum). All parts in the TO-263AB package have identical thermal dissipation characteristics.

Q: What packaging considerations apply to the STPS3150UY?

A: The STPS3150UY uses SMB (DO-214AA) package, which differs from the TO-263AB (D2PAK) package of the main part and other primary substitutes. SMB package requires different PCB footprint, trace routing, and thermal management design. This substitute is suitable only when PCB layout can accommodate the SMB package configuration.

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