FS8G Equivalent & Substitute Parts

Part Overview

The FS8G is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 8 A average rectified current in a surface mount TO-277-3 package. This component is classified as not for new designs, indicating it has been superseded in onsemi's product portfolio. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 8 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-277, 3-PowerDFN	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of rectifier diodes is determined by electrical compatibility across the following critical parameters:

Voltage Rating: All substitute parts must maintain the 400 V DC reverse voltage specification to ensure safe operation within the intended circuit application.

Current Rating: The average rectified current (Io) is the primary limiting factor. The FS8G is rated for 8 A. Substitute parts must meet or exceed this current specification to handle the same load conditions.

Forward Voltage Drop: Forward voltage characteristics at the specified current level must be equivalent to ensure consistent circuit performance and power dissipation profiles.

Recovery Characteristics: Standard recovery speed classification (>500 ns, >200 mA) must be maintained for proper switching behavior in rectification applications.

Reverse Leakage Current: Leakage specifications must be equivalent to maintain circuit reliability and prevent unintended current paths.

Package Compatibility: Surface mount TO-277 family packages (TO-277, TO-277A, TO-277B, TO-277-3) are mechanically and electrically compatible within the 3-PowerDFN footprint designation.

Environmental Compliance: RoHS3 compliance and MSL ratings ensure substitutes meet regulatory and manufacturing process requirements.

Parameter Comparison

Parameter	FS8G (onsemi)	GV804_R1_00001 (Panjit)	GV804B_R2_00001 (Panjit)	S8PG-M3/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	8 A	8 A	8 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 8 A	1.1 V @ 8 A	1.1 V @ 8 A	1.1 V @ 8 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
Product Status	Not For New Designs	Active	Active	Active

Engineering Selection Recommendations

Full Parametric Equivalents: GV804_R1_00001 and GV804B_R2_00001 (both Panjit International Inc.) are parametric equivalents to the FS8G. These parts maintain identical electrical specifications across voltage rating, current capacity, forward voltage drop, recovery characteristics, and reverse leakage current. Both are classified as active products, ensuring continued availability and manufacturing support. The primary distinction between these two Panjit alternatives is the package variant designation (TO-277 versus TO-277B), both compatible with the 3-PowerDFN footprint. Selection between GV804_R1_00001 and GV804B_R2_00001 depends on specific PCB layout requirements and supplier availability.

Partial Substitute: S8PG-M3/H (Vishay General Semiconductor - Diodes Division) shares the same voltage rating, forward voltage characteristics, recovery speed, reverse leakage current, and operating temperature range as the FS8G. However, this part is rated for 2 A average rectified current, which is below the 8 A specification of the FS8G. S8PG-M3/H is suitable only for applications where the actual circuit current requirement does not exceed 2 A, despite the FS8G design specification of 8 A.

Product Status Consideration: The FS8G is designated as not for new designs. For new circuit designs, GV804_R1_00001 or GV804B_R2_00001 are recommended as they maintain active product status with ongoing manufacturer support and supply chain continuity.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and equivalent environmental specifications, ensuring regulatory alignment with the original FS8G component.

Frequently Asked Questions (FAQ)

Q: Can GV804_R1_00001 or GV804B_R2_00001 be used as direct replacements for FS8G in existing designs?

A: Yes. Both Panjit parts are parametric equivalents with identical electrical specifications: 400 V reverse voltage, 8 A current rating, 1.1 V forward voltage drop at 8 A, standard recovery speed, and 5 µA reverse leakage current. Package compatibility within the TO-277 family and 3-PowerDFN footprint allows direct substitution without circuit redesign.

Q: What is the difference between GV804_R1_00001 and GV804B_R2_00001?

A: Both parts are manufactured by Panjit International Inc. and share identical electrical specifications. The distinction is the package variant: GV804_R1_00001 uses TO-277 packaging, while GV804B_R2_00001 uses TO-277B packaging. Both are compatible with the 3-PowerDFN footprint. Selection depends on PCB layout requirements and supplier availability.

Q: Why is S8PG-M3/H listed as a substitute if it has a lower current rating?

A: S8PG-M3/H is listed as a partial substitute because it maintains all electrical characteristics except current capacity. It is suitable for applications where the actual circuit current does not exceed 2 A. For circuits requiring the full 8 A capacity of the FS8G, S8PG-M3/H is not appropriate.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. FS8G, GV804_R1_00001, GV804B_R2_00001, and S8PG-M3/H are all ROHS3 compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the moisture sensitivity level (MSL) for S8PG-M3/H?

A: The MSL specification for S8PG-M3/H is not provided in the available technical data. Consult the manufacturer's datasheet for complete moisture sensitivity information if this parameter is critical for your manufacturing process.

Q: Can these diodes be used in automotive applications?

A: The FS8G carries automotive grade qualification (AEC-Q101). Automotive qualification status for the substitute parts (GV804_R1_00001, GV804B_R2_00001, and S8PG-M3/H) is not specified in the provided data. Consult manufacturer documentation if automotive qualification is a requirement.

Q: What is the reverse recovery time (trr) for each part?

A: FS8G has a reverse recovery time of 3.37 µs. GV804_R1_00001 and GV804B_R2_00001 do not specify trr in the provided data. S8PG-M3/H has a reverse recovery time of 5 µs. Consult detailed datasheets if reverse recovery time is a critical parameter for your application.

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