STP40N65M2 Equivalent & Substitute Parts

Part Overview

The STP40N65M2 is an N-Channel MOSFET manufactured by STMicroelectronics, designed for high-voltage switching applications. This device operates at 650V drain-to-source voltage with a continuous drain current of 32A at 25°C and maximum power dissipation of 250W. The component is housed in a TO-220-3 through-hole package and is part of the MDmesh™ M2 series. The product maintains Active status and is ROHS3 compliant.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances, or when similar performance characteristics are available in alternative package configurations or from different manufacturers. Alternative components may be required due to supply chain considerations, package availability, or design optimization for specific thermal or mechanical constraints.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	32	A
Rds On (Max) @ 16A, 10V	99	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	56.5	nC
Power Dissipation (Max)	250	W
Operating Temperature (TJ)	150	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitute parts for the STP40N65M2 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (STW40N65M2): This substitute maintains identical electrical specifications across all critical parameters including Vdss (650V), Id (32A), Rds On (99mOhm @ 16A, 10V), gate charge (56.5 nC @ 10V), and power dissipation (250W). The primary difference is the package configuration: TO-247-3 instead of TO-220-3. Both are through-hole mounting types with equivalent thermal and electrical performance. This classification permits direct functional substitution where PCB layout and thermal management accommodate the alternative package footprint.

Similar Manufacturer Part (FCP104N60F): This onsemi component provides comparable performance within relaxed parameter tolerances. The device operates at 600V Vdss (50V lower than the main part), supports 37A continuous drain current (5A higher), and dissipates 357W maximum power (107W higher). The Rds On specification is 104mOhm @ 18.5A, 10V, representing a 5mOhm increase. Gate charge is significantly higher at 145 nC @ 10V. This part maintains TO-220-3 package compatibility but carries a "Not For New Designs" product status. Selection of this substitute requires verification that the 50V voltage margin reduction and increased gate charge do not compromise circuit performance or switching characteristics.

Parameter Comparison

Parameter	STP40N65M2 (Main)	STW40N65M2 (Parametric Equivalent)	FCP104N60F (Similar)
Manufacturer	STMicroelectronics	STMicroelectronics	onsemi
Drain to Source Voltage (Vdss)	650 V	650 V	600 V
Continuous Drain Current (Id) @ 25°C	32 A	32 A	37 A
Rds On (Max) @ Vgs 10V	99 mOhm @ 16A	99 mOhm @ 16A	104 mOhm @ 18.5A
Gate Threshold Voltage (Vgs(th)) @ 250µA	4 V	4 V	5 V
Gate Charge (Qg) @ 10V	56.5 nC	56.5 nC	145 nC
Input Capacitance (Ciss) @ Vds	2355 pF @ 100V	2355 pF @ 100V	6130 pF @ 25V
Power Dissipation (Max)	250 W	250 W	357 W
Operating Temperature (TJ)	150°C	150°C	-55°C ~ 150°C
Package / Case	TO-220-3	TO-247-3	TO-220-3
Product Status	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STW40N65M2 Selection Criteria: This substitute is appropriate for applications where the TO-247-3 package footprint is acceptable and thermal management requirements can be met with the alternative package geometry. Electrical performance is identical to the STP40N65M2, ensuring no circuit redesign is necessary. Both components maintain Active product status and ROHS3 compliance. The TO-247-3 package typically provides superior thermal performance compared to TO-220-3 due to increased copper area and improved heat dissipation characteristics. This substitute is suitable for new designs and production applications.

FCP104N60F Selection Criteria: This component is classified as "Not For New Designs" and should be reserved for legacy system maintenance, repair, or applications where existing inventory must be utilized. The 50V reduction in Vdss (from 650V to 600V) requires circuit analysis to confirm adequate voltage margin for the intended application. The significantly higher gate charge (145 nC versus 56.5 nC) will increase switching losses and may require gate driver circuit modifications. The increased input capacitance (6130 pF versus 2355 pF) affects switching speed and gate drive requirements. Selection of this part is limited to scenarios where performance degradation is acceptable and the reduced voltage rating does not compromise system reliability.

Frequently Asked Questions (FAQ)

Q: Can STW40N65M2 be used as a direct replacement for STP40N65M2 in existing designs?

A: STW40N65M2 provides identical electrical specifications and can function as a direct electrical substitute. However, the TO-247-3 package has a different PCB footprint than the TO-220-3 package of the main part. PCB layout modification is required to accommodate the alternative package. Thermal management characteristics differ between packages; verify that thermal performance remains acceptable in the target application.

Q: What are the limitations of using FCP104N60F as a substitute?

A: FCP104N60F operates at 600V maximum Vdss compared to 650V for the STP40N65M2, reducing the voltage safety margin by 50V. Gate charge is 2.56 times higher (145 nC versus 56.5 nC), increasing switching losses and potentially requiring gate driver circuit redesign. Input capacitance is 2.6 times higher, affecting switching speed. The product carries "Not For New Designs" status, restricting its use to legacy applications. These factors make FCP104N60F unsuitable for new circuit designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both STW40N65M2 and FCP104N60F are ROHS3 compliant, matching the compliance status of the STP40N65M2. All three components are REACH Unaffected and carry EAR99 ECCN classification.

Q: How do package differences affect thermal performance?

A: TO-247-3 packages typically provide superior thermal performance compared to TO-220-3 packages due to increased copper area and improved heat dissipation paths. When substituting STP40N65M2 (TO-220-3) with STW40N65M2 (TO-247-3), thermal resistance may be lower, potentially improving overall system thermal management. Verify thermal performance through thermal simulation or testing for the specific application.

Q: What is the significance of the "Not For New Designs" status for FCP104N60F?

A: This designation indicates that onsemi has discontinued active development and support for FCP104N60F. The component remains available for existing applications but is not recommended for new circuit designs. Manufacturers typically apply this status when superior alternatives exist or when the product line is being phased out. New designs should prioritize Active status components such as STP40N65M2 or STW40N65M2.

Q: Can gate charge differences affect circuit performance?

A: Yes. Gate charge directly impacts switching speed and gate driver power requirements. FCP104N60F requires 145 nC compared to 56.5 nC for STP40N65M2, representing a 2.56x increase. Higher gate charge increases switching losses, extends switching time, and demands higher gate driver current capability. Existing gate driver circuits designed for STP40N65M2 may require modification to accommodate FCP104N60F.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message