STP8N65M5 Equivalent & Substitute Parts

Part Overview

The STP8N65M5 is an N-Channel 650V 7A MOSFET manufactured by STMicroelectronics in the MDmesh™ V series. This device is packaged in TO-220-3 through-hole configuration and rated for 70W maximum power dissipation at case temperature. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and availability constraints.

Substiute Parts

STP8N65M5

STMicroelectronicsIn Stock: 2448STP8N65M5 Datasheet

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STP11N65M5

STMicroelectronicsIn Stock: 893STP11N65M5 Datasheet

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FCP7N60

onsemiIn Stock: 15208FCP7N60 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STP8N65M5 is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The Drain to Source Voltage (Vdss) of 650V establishes the maximum blocking voltage. Substitute parts must maintain this rating or exceed it without introducing incompatibility in the application circuit.

Current Rating: The continuous drain current (Id) of 7A at 25°C defines the thermal and electrical load capacity. Substitute parts with equal or higher current ratings are acceptable provided thermal management remains adequate.

On-State Resistance (Rds On): The maximum on-state resistance of 600mOhm at 3.5A and 10V gate voltage directly impacts power dissipation and switching losses. Substitute parts with equal or lower Rds On values maintain or improve circuit efficiency.

Gate Charge (Qg): The gate charge of 15nC at 10V determines gate drive requirements and switching speed. Substitute parts with comparable or lower gate charge ensure compatibility with existing gate drive circuits.

Threshold Voltage (Vgs(th)): The gate threshold voltage of 5V at 250µA establishes the minimum gate voltage for device turn-on. Substitute parts must maintain this specification for reliable switching operation.

Package and Mounting: The TO-220-3 through-hole package is a mechanical requirement. Substitute parts must use identical or directly compatible packaging to ensure PCB layout and thermal interface compatibility.

Compliance: RoHS3 compliance and REACH unaffected status are mandatory for regulatory conformance. All substitute parts must maintain these certifications.

Parameter Comparison

Engineering Selection Recommendations

STP11N65M5 (STMicroelectronics)

The STP11N65M5 is the primary substitute for the STP8N65M5. Both devices are from the same manufacturer's MDmesh™ V series and share identical voltage ratings (650V Vdss) and gate threshold specifications (5V @ 250µA). The STP11N65M5 offers superior electrical performance with 9A continuous drain current versus 7A, 85W power dissipation versus 70W, and lower on-state resistance (480mOhm @ 4.5A versus 600mOhm @ 3.5A). The device is currently in active production status, ensuring long-term availability and supply chain stability. Gate charge is marginally higher at 17nC versus 15nC, representing a 13% increase that remains within acceptable gate drive circuit tolerances. This part is suitable for direct replacement in applications where the higher current and power ratings provide design margin.

FCP7N60 (onsemi)

The FCP7N60 provides functional equivalence with matched current rating (7A) and on-state resistance (600mOhm @ 3.5A). The device maintains the same gate threshold voltage (5V @ 250µA) and TO-220-3 package configuration. However, the Vdss rating is reduced to 600V, representing a 50V margin reduction from the original 650V specification. This voltage derating is acceptable only in applications where the maximum operating voltage does not exceed 600V. The gate charge specification is significantly higher at 30nC versus 15nC, requiring verification of gate drive circuit capability to deliver the additional charge within acceptable switching time windows. The device is classified as "Not For New Designs," indicating limited future availability and potential obsolescence risk. Input capacitance is also elevated at 920pF, which may impact switching speed in high-frequency applications. This part is suitable as a secondary substitute where voltage margin is available and gate drive capability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the STP11N65M5 be used as a direct replacement for the STP8N65M5?

A: Yes. The STP11N65M5 is a direct substitute with superior electrical specifications. Both devices share identical Vdss (650V), Vgs(th) (5V @ 250µA), and package configuration (TO-220-3). The STP11N65M5 provides higher current capacity (9A versus 7A) and lower on-state resistance (480mOhm versus 600mOhm), making it suitable for direct PCB replacement without circuit modification. The marginal increase in gate charge (17nC versus 15nC) is within standard gate drive tolerances.

Q: What is the voltage limitation when using the FCP7N60?

A: The FCP7N60 has a Vdss rating of 600V, which is 50V lower than the STP8N65M5 (650V). This part is suitable only for applications where the maximum operating voltage does not exceed 600V. Applications requiring the full 650V blocking voltage must use the STP11N65M5 or equivalent 650V-rated devices.

Q: How does gate charge affect gate drive circuit selection?

A: Gate charge (Qg) determines the total charge that must be supplied to the gate to achieve full on-state conduction. The STP8N65M5 requires 15nC, the STP11N65M5 requires 17nC, and the FCP7N60 requires 30nC. Gate drive circuits must supply sufficient current to deliver this charge within the required switching time. The FCP7N60's 30nC specification is double that of the STP8N65M5, potentially requiring gate drive circuit verification or redesign in high-frequency switching applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the STP11N65M5 and FCP7N60 are RoHS3 compliant and REACH unaffected, matching the compliance status of the original STP8N65M5. All three devices are suitable for applications with regulatory compliance requirements.

Q: What is the difference between the product status classifications?

A: The STP8N65M5 is classified as obsolete, indicating it is no longer manufactured and existing inventory is limited. The STP11N65M5 is active, meaning it is in current production with assured long-term availability. The FCP7N60 is classified as "Not For New Designs," indicating the manufacturer recommends against using this part in new product development due to planned obsolescence. For new designs, the STP11N65M5 is the preferred choice.

Q: Can the FCP7N60 be used in high-frequency switching applications?

A: The FCP7N60 has higher input capacitance (920pF @ 25V) and gate charge (30nC) compared to the STP8N65M5 (690pF @ 100V and 15nC). These characteristics result in slower switching transitions and increased switching losses at high frequencies. Applications operating above 100kHz should use the STP11N65M5 or verify that the FCP7N60's switching performance meets thermal and efficiency requirements.

Q: Is the TO-220-3 package identical across all three parts?

A: Yes. All three devices use the TO-220-3 through-hole package with identical pin configuration and mechanical dimensions. Direct PCB replacement is possible without layout modification. Thermal interface requirements (heatsink mounting) remain consistent across all three parts.