FES10J Equivalent & Substitute Parts

Part Overview

The FES10J is a general-purpose rectifier diode manufactured by onsemi, rated for 600V DC reverse voltage and 10A 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 This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio.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 substitute parts is necessary for applications requiring continued support, legacy system maintenance, or when the primary part becomes unavailable from inventory.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	1.8 V @ 10 A	V
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Package / Case	TO-277, 3-PowerDFN	—
Operating Temperature - Junction	-55 to 175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FES10J are identified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600V minimum
Package / Case: TO-277, 3-PowerDFN form factor
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Current - Average Rectified (Io): Equal to or greater than required application current
Operating Temperature Range: Minimum -55°C to 175°C junction temperature
Automotive Grade and AEC-Q101 qualification (where applicable)

The identified substitute parts operate at the same reverse voltage rating and share the same package footprint. However, current ratings and recovery characteristics differ, requiring circuit-level evaluation for specific applications.

Parameter Comparison

Parameter	FES10J (onsemi)	S4PJ-M3/87A (Vishay)	SE40PJHM3_A/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	10 A	4 A	2.4 A
Voltage - Forward (Vf) (Max) @ If	1.8 V @ 10 A	1.1 V @ 4 A	1.05 V @ 4 A
Reverse Recovery Time (trr)	30 ns	2.5 µs	2.2 µs
Current - Reverse Leakage @ Vr	5 µA @ 600 V	10 µA @ 600 V	10 µA @ 600 V
Capacitance @ Vr, F	140 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	28 pF @ 4V, 1MHz
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN
Operating Temperature - Junction	-55 to 175 °C	-55 to 150 °C	-55 to 175 °C
Grade	Automotive	—	Automotive
Qualification	AEC-Q101	—	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active

Engineering Selection Recommendations

FES10J (onsemi) — Primary Part: The FES10J is classified as "Not For New Designs" and carries automotive-grade AEC-Q101 qualification. This part is suitable for legacy system support and maintenance applications where the original specification must be maintained. The 10A current rating and fast recovery time (30 ns) define the baseline performance envelope.

S4PJ-M3/87A (Vishay) — Partial Substitute: This part shares the 600V reverse voltage rating and TO-277 package footprint. However, the current rating is reduced to 4A, and recovery time extends to 2.5 µs. This part is not automotive-qualified and operates to a maximum junction temperature of 150°C, compared to 175°C for the FES10J. Selection of this substitute is limited to applications where the 4A current rating is sufficient and the extended recovery time does not impact circuit performance.

SE40PJHM3_A/H (Vishay) — Partial Substitute: This part maintains the 600V reverse voltage rating, TO-277 package footprint, and automotive-grade AEC-Q101 qualification. The operating temperature range matches the FES10J (-55 to 175°C). However, the current rating is reduced to 2.4A, and recovery time extends to 2.2 µs. This substitute is applicable only to applications where the 2.4A current rating is adequate.

Substitution Constraints: Both Vishay alternatives have lower current ratings than the FES10J. Direct substitution is only valid when the application current requirement does not exceed the substitute part's rating. The extended recovery times of the Vishay parts may affect high-frequency switching performance compared to the FES10J's 30 ns specification.

Frequently Asked Questions (FAQ)

Q: Can the S4PJ-M3/87A replace the FES10J in all applications?

A: No. The S4PJ-M3/87A has a maximum current rating of 4A, compared to the FES10J's 10A rating. Substitution is valid only when the application current requirement does not exceed 4A. Additionally, the S4PJ-M3/87A is not automotive-qualified and has a lower maximum junction temperature (150°C vs. 175°C).

Q: What is the significance of the reverse recovery time difference?

A: The FES10J has a reverse recovery time of 30 ns (fast recovery), while both Vishay substitutes have recovery times in the microsecond range (2.5 µs and 2.2 µs). In high-frequency switching applications, the longer recovery time may increase switching losses and heat generation. Applications operating at low switching frequencies may not be affected.

Q: Are the substitute parts pin-compatible with the FES10J?

A: Yes. All three parts use the TO-277, 3-PowerDFN package, which provides identical pin configuration and footprint. Physical board-level replacement is possible without PCB redesign.

Q: Which substitute part is preferred for automotive applications?

A: The SE40PJHM3_A/H is the preferred substitute for automotive applications. It carries AEC-Q101 qualification and maintains the full -55 to 175°C operating temperature range of the FES10J. However, its 2.4A current rating limits its use to lower-current applications.

Q: Can I use the S4PJ-M3/87A in an automotive application?

A: The S4PJ-M3/87A is not automotive-qualified and does not carry AEC-Q101 certification. Use in automotive applications is not recommended based on the provided specifications.

Q: What should I verify before selecting a substitute part?

A: Confirm that the application's maximum current requirement does not exceed the substitute part's current rating. Verify that the switching frequency and recovery time requirements are compatible with the substitute's specifications. For automotive applications, ensure AEC-Q101 qualification is maintained if required by system specifications.

Q: Are all three parts RoHS3 compliant?

A: Yes. The FES10J, S4PJ-M3/87A, and SE40PJHM3_A/H are all ROHS3 compliant and REACH unaffected.

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