FS8M Equivalent & Substitute Parts

Part Overview

The FS8M is a general-purpose rectifier diode manufactured by onsemi, rated for 1000 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 This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued support, legacy system maintenance, or when the primary part becomes unavailable. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating package variant differences.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 8 A	V
Reverse Recovery Time (trr)	3.37	µs
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-277, 3-PowerDFN	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the FS8M are grouped based on strict electrical parameter matching and package compatibility. The primary substitution criteria are:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 8 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 8 A
Operating Temperature - Junction: -55°C to 150°C
Mounting Type: Surface Mount
Package Family: TO-277 variants (TO-277, TO-277A, TO-277B)

Substitution Logic:

Parts GV810_R1_00001 and GV810B_R2_00001 (Panjit International Inc.) are parametric equivalents that match all critical electrical specifications and maintain the same operating temperature range. These parts differ only in package variant designation (TO-277 versus TO-277B) but remain within the TO-277 family, ensuring mechanical and electrical compatibility.

Part S8PM-M3/H (Vishay General Semiconductor - Diodes Division) presents a limited substitution option. While it maintains the 1000 V reverse voltage rating and identical forward voltage specification, its average rectified current rating is reduced to 2 A, making it unsuitable for applications requiring the full 8 A capacity of the FS8M.

Parameter Comparison

Parameter	FS8M (onsemi)	GV810_R1_00001 (Panjit)	GV810B_R2_00001 (Panjit)	S8PM-M3/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 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 @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C 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
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Not For New Designs	Active	Active	Active

Engineering Selection Recommendations

Recommended Substitutes (Full Electrical Equivalents):

GV810_R1_00001 and GV810B_R2_00001 from Panjit International Inc. are the primary recommended substitutes for the FS8M. Both parts maintain complete electrical equivalence across all critical parameters: 1000 V reverse voltage, 8 A average rectified current, 1.1 V forward voltage at 8 A, and identical operating temperature range. Both are classified as Active products, ensuring continued availability and support. The distinction between these two parts is the package variant designation (TO-277 versus TO-277B), both of which are compatible with TO-277 family footprints. Both parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the FS8M.

Limited Substitution Option:

S8PM-M3/H from Vishay General Semiconductor - Diodes Division is not recommended as a direct substitute due to its reduced average rectified current rating of 2 A, which is insufficient for applications requiring the full 8 A capacity of the FS8M. This part is suitable only for applications with reduced current requirements.

Compliance Considerations:

The FS8M carries Automotive grade classification with AEC-Q101 qualification. While the Panjit substitutes do not explicitly list automotive qualification in the provided data, both are Active products with ROHS3 and REACH compliance. Applications requiring automotive-grade components should confirm AEC-Q101 qualification status with the manufacturer before final selection.

Frequently Asked Questions (FAQ)

Q: Can GV810_R1_00001 or GV810B_R2_00001 be used as direct replacements for FS8M in existing designs?

A: Yes. Both Panjit parts are parametric equivalents with identical electrical specifications: 1000 V reverse voltage, 8 A average rectified current, and 1.1 V forward voltage at 8 A. Both are Surface Mount devices in the TO-277 package family and are mechanically compatible with FS8M footprints.

Q: What is the difference between GV810_R1_00001 and GV810B_R2_00001?

A: The primary difference is the package variant designation: GV810_R1_00001 uses TO-277, while GV810B_R2_00001 uses TO-277B. Both are within the TO-277 family and maintain identical electrical specifications and footprint compatibility.

Q: Why is S8PM-M3/H not recommended as a substitute?

A: S8PM-M3/H has a maximum average rectified current rating of 2 A, compared to the 8 A requirement of the FS8M. This part is unsuitable for applications requiring full 8 A capacity and would result in component overstress and potential failure.

Q: Are the Panjit substitutes suitable for automotive applications?

A: The provided data indicates both Panjit parts are Active products with ROHS3 and REACH compliance. However, automotive qualification status (AEC-Q101) is not explicitly stated in the available specifications. Applications requiring automotive-grade components should confirm qualification requirements with the manufacturer.

Q: What is the inventory status of substitute parts?

A: GV810B_R2_00001 has 10,692 pieces in stock, GV810_R1_00001 has 940 pieces in stock, and S8PM-M3/H has 671 pieces in stock. The FS8M has 11,352 pieces in stock but is classified as "Not For New Designs."

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All substitute parts listed (GV810_R1_00001, GV810B_R2_00001, and S8PM-M3/H) are ROHS3 compliant and REACH Unaffected, matching the regulatory compliance of the FS8M.

Q: Can package variant differences affect PCB layout?

A: All parts in this comparison use the TO-277 package family with 3-PowerDFN configuration. While TO-277, TO-277A, and TO-277B are distinct variants, they maintain compatible footprints for Surface Mount applications. PCB layout verification is recommended when transitioning between specific package variants.

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