FS8J Equivalent & Substitute Parts

Part Overview

The FS8J is a general-purpose rectifier diode manufactured by onsemi, rated for 600 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 This component is classified as not for new designs, indicating it has been superseded in onsemi's product portfolio.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 sourcing, design flexibility, or alternative supplier options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	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 @ 600 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	TO-277, 3-PowerDFN
Technology	Standard
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the FS8J rectifier diode is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 8 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 8 A maximum
Current - Reverse Leakage @ Vr: 5 µA @ 600 V maximum
Operating Temperature - Junction: -55°C to 150°C minimum range
Mounting Type: Surface Mount
Package / Case: TO-277 family variants
Technology: Standard recovery diode
RoHS3 Compliance: Required

Substitute Classification:

Parametric Equivalents (GV806_R1_00001, GV806B_R2_00001): These parts meet or exceed all critical electrical parameters and maintain identical package family specifications. Both are manufactured by Panjit International Inc. and carry active product status with full compliance certifications.

Functional Substitute (S8PJ-M3/H): This Vishay part maintains voltage and forward voltage specifications but is rated for 2 A average rectified current, which is below the 8 A requirement of the FS8J. This part is suitable only for applications where the actual current demand does not exceed 2 A, despite the FS8J's 8 A rating.

Parameter Comparison

Parameter	FS8J (onsemi)	GV806_R1_00001 (Panjit)	GV806B_R2_00001 (Panjit)	S8PJ-M3/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 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 @ 600 V	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 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
Supplier Device Package	TO-277-3	TO-277	TO-277B	TO-277A (SMPC)
Technology	Standard	Standard	Standard	Standard
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active

Engineering Selection Recommendations

For Full Parametric Equivalence:

GV806_R1_00001 and GV806B_R2_00001 (both Panjit International Inc.) are direct parametric equivalents to the FS8J. Both parts maintain the complete electrical specification set, including 8 A average rectified current, 600 V reverse voltage, and 1.1 V forward voltage at 8 A. Both carry active product status, ensuring continued availability and manufacturing support. Both are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1). The primary distinction between these two Panjit variants is the supplier device package designation (TO-277 versus TO-277B), which represents minor physical packaging variations within the TO-277 family. Both are suitable for direct replacement in applications currently using the FS8J.

For Current-Limited Applications:

S8PJ-M3/H (Vishay General Semiconductor - Diodes Division) maintains voltage and forward voltage specifications but is rated for 2 A average rectified current. This part is suitable only for circuit designs where the actual operating current does not exceed 2 A. Use of this part in applications requiring the full 8 A capability of the FS8J will result in component overstress and potential failure.

Compliance Considerations:

All substitute parts listed carry ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the FS8J. The FS8J carries automotive grade qualification (AEC-Q101), while the Panjit equivalents do not explicitly list automotive qualification in the provided specifications. Applications requiring automotive-grade components should confirm qualification status with the manufacturer before selection.

Frequently Asked Questions (FAQ)

Q: Can GV806_R1_00001 or GV806B_R2_00001 be used as direct replacements for FS8J?

A: Yes. Both Panjit parts meet all critical electrical parameters: 600 V reverse voltage, 8 A average rectified current, 1.1 V forward voltage at 8 A, and identical operating temperature range. Both are surface mount components in the TO-277 package family. The primary difference is product status: the FS8J is not for new designs, while both Panjit parts are active. Both Panjit parts are suitable for direct substitution in existing FS8J applications.

Q: Why is S8PJ-M3/H listed as a substitute if it has only 2 A current rating?

A: S8PJ-M3/H is listed as a functional substitute based on voltage and forward voltage compatibility. However, its 2 A current rating is significantly lower than the FS8J's 8 A rating. This part is suitable only for applications where actual circuit current does not exceed 2 A. It is not a full replacement for designs requiring 8 A capability.

Q: What is the difference between GV806_R1_00001 and GV806B_R2_00001?

A: Both parts are manufactured by Panjit International Inc. and share identical electrical specifications. The difference is in the supplier device package designation: GV806_R1_00001 uses TO-277, while GV806B_R2_00001 uses TO-277B. These represent minor physical packaging variations within the TO-277 family. Both are electrically equivalent and suitable for the same applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The FS8J and all listed substitute parts (GV806_R1_00001, GV806B_R2_00001, and S8PJ-M3/H) are ROHS3 compliant. All carry REACH unaffected status and EAR99 ECCN classification.

Q: Does the FS8J have automotive qualification?

A: Yes. The FS8J carries automotive grade qualification with AEC-Q101 certification. The Panjit equivalents (GV806_R1_00001 and GV806B_R2_00001) do not list automotive qualification in the provided specifications. Applications requiring automotive-grade components should verify qualification status with Panjit before selection.

Q: What is the reverse recovery time difference between FS8J and the Panjit substitutes?

A: The FS8J specifies a reverse recovery time (trr) of 3.37 µs. GV806_R1_00001 and GV806B_R2_00001 do not provide a specific trr value in the available specifications, only the standard recovery speed classification. Both parts meet the standard recovery specification (>500ns, >200mA). For applications sensitive to reverse recovery time, confirm the exact trr specification with Panjit.

Q: Can the FS8J be used in new designs?

A: No. The FS8J is marked as not for new designs, indicating it has been superseded in onsemi's product portfolio. For new designs, use GV806_R1_00001 or GV806B_R2_00001 (Panjit), which carry active product status and ensure long-term availability.

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