STWA50N65DM2AG N-Channel 650V 38A MOSFET Equivalent & Substitute Parts

Part Overview

The STWA50N65DM2AG is an N-Channel 650V 38A MOSFET manufactured by STMicroelectronics in the MDmesh™ DM2 series. This device is packaged in TO-247-3 through-hole configuration and rated for 300W power dissipation at case temperature. The part is qualified to AEC-Q101 automotive standards and carries Active product status with ROHS3 compliance.

Substitute parts are necessary when the primary device is unavailable, when design requirements demand alternative electrical characteristics within acceptable operating parameters, or when supply chain considerations require qualified alternatives. Equivalent MOSFETs must maintain compatibility across drain-source voltage rating, continuous drain current capability, gate drive voltage, on-state resistance, and thermal performance within the application's design margins.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	650	V
Continuous Drain Current (Id) @ 25°C	38	A
Rds On (Max) @ 19A, 10V	87	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	69	nC
Power Dissipation (Max)	300	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	Through Hole
Qualification	AEC-Q101	Automotive

Substitute Part Grouping Explanation

Substitution of the STWA50N65DM2AG is determined by the following critical parameters:

Voltage Rating Compatibility: The primary device operates at 650V Vdss. Substitute parts must maintain equal or higher voltage rating to ensure safe operation under maximum applied drain-source voltage. Parts rated at 600V represent a 50V reduction and are acceptable only when application maximum voltage does not exceed 600V.

Current Capability: The STWA50N65DM2AG delivers 38A continuous drain current. Substitute parts with equal or higher current ratings ensure thermal margin and prevent device stress. Parts with lower current ratings require application re-evaluation.

On-State Resistance (Rds On): The 87mOhm specification at 19A and 10V gate drive determines conduction losses. Substitute parts with comparable or lower Rds On values maintain or improve efficiency characteristics.

Gate Drive Voltage: All qualified substitutes operate at 10V gate drive voltage, ensuring compatibility with existing gate driver circuits.

Thermal Performance: Power dissipation rating of 300W and operating temperature range of -55°C to 150°C define thermal envelope. Substitute parts must support equivalent or superior thermal performance.

Package and Mounting: TO-247-3 through-hole configuration is mandatory for mechanical and electrical compatibility with existing PCB layouts.

Compliance and Qualification: AEC-Q101 automotive qualification and ROHS3 compliance are specified for the primary device. Substitute parts with matching or equivalent certifications ensure regulatory and quality requirements are maintained.

Parameter Comparison

Parameter	STWA50N65DM2AG	TK39N60W5,S1VF	TK35N65W,S1F	FCH077N65F-F085	APT47N60BC3G	FCH47N60-F133	IPW60R070P6XKSA1	IXFX64N60P3
Manufacturer	STMicroelectronics	Toshiba	Toshiba	Fairchild	Microchip	onsemi	Infineon	IXYS
Vdss (V)	650	600	650	650	600	600	600	600
Id @ 25°C (A)	38	38.8	35	54	47	47	53.5	64
Rds On (mOhm)	87 @ 19A	74 @ 19.4A	80 @ 17.5A	77 @ 27A	70 @ 30A	70 @ 23.5A	70 @ 20.6A	95 @ 32A
Vgs(th) (V)	5 @ 250µA	4.5 @ 1.9mA	3.5 @ 2.1mA	5 @ 250µA	3.9 @ 2.7mA	5 @ 250µA	4.5 @ 1.72mA	5 @ 4mA
Qg @ 10V (nC)	69	135	100	164	260	270	100	145
Power Dissipation (W)	300	270	270	481	417	417	391	1130
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-247-3	TO-247-3	TO-247-3	TO-247-3	TO-247 [B]	TO-247-3	PG-TO247-3	PLUS247™-3
Product Status	Active	Active	Active	Active	Active	Not For New Designs	Active	Active
AEC-Q101	Yes	No	No	Yes	No	No	No	No
ROHS3	Yes	Yes	Yes	Not Specified	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Primary Equivalent (650V Rating, Automotive Qualified):

FCH077N65F-F085 from Fairchild Semiconductor is the closest functional equivalent. This device maintains the 650V Vdss rating required for applications designed to the STWA50N65DM2AG specification. It delivers 54A continuous drain current, exceeding the 38A requirement with thermal margin. The 77mOhm on-state resistance is comparable to the primary device. Gate charge of 164nC is higher than the primary device's 69nC, requiring verification of gate driver capability. The device carries AEC-Q101 automotive qualification matching the primary part. Product status is Active, ensuring long-term availability. Power dissipation rating of 481W provides superior thermal performance.

Secondary Equivalent (650V Rating, Non-Automotive):

TK35N65W,S1F from Toshiba Semiconductor maintains 650V Vdss rating with 35A continuous current capability. The 80mOhm on-state resistance is within acceptable range of the primary device. Gate charge of 100nC is moderate. This device is Active status with ROHS3 compliance but does not carry AEC-Q101 qualification. Use is appropriate for non-automotive applications or where automotive qualification is not contractually required.

Alternative (600V Rating, Higher Current):

APT47N60BC3G from Microchip Technology operates at 600V Vdss, suitable for applications where maximum voltage does not exceed 600V. The device delivers 47A continuous current with 70mOhm on-state resistance, both superior to the primary device. Gate charge of 260nC is significantly higher, requiring gate driver re-evaluation. Product status is Active with ROHS3 compliance. This part is appropriate for non-automotive applications requiring higher current capability.

Alternative (600V Rating, Highest Current):

IXFX64N60P3 from IXYS operates at 600V Vdss with 64A continuous current capability. The 95mOhm on-state resistance is higher than the primary device, resulting in increased conduction losses. Power dissipation rating of 1130W is exceptional. Gate charge of 145nC is moderate. Product status is Active with ROHS3 compliance. This part is suitable for applications prioritizing current capacity over efficiency.

Not Recommended for New Designs:

FCH47N60-F133 and FCH070N60E from onsemi carry "Not For New Designs" product status. These devices should not be selected for new applications despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I substitute the STWA50N65DM2AG with a 600V rated MOSFET?

A: Substitution with 600V rated devices is permissible only when the application's maximum drain-source voltage does not exceed 600V. The primary device is rated for 650V operation. If your circuit design applies voltages between 600V and 650V, a 600V substitute will not provide adequate safety margin and must not be used. Verify maximum voltage stress in your application before selecting a 600V alternative.

Q: What is the significance of the gate charge (Qg) parameter in substitution?

A: Gate charge determines the energy required to switch the MOSFET on and off. The primary device requires 69nC at 10V gate drive. Substitute parts with significantly higher gate charge (such as FCH47N60-F133 at 270nC) require higher gate driver current capability and may increase switching losses. Verify that your gate driver circuit can supply the required charge current for the substitute device without exceeding driver output current ratings.

Q: Is AEC-Q101 qualification mandatory for my application?

A: AEC-Q101 automotive qualification is mandatory only if your application is subject to automotive industry standards or contractual requirements. The primary device carries this qualification. If your application is non-automotive or does not require automotive qualification, substitute parts without this certification are acceptable. Verify your application's qualification requirements before selecting a substitute.

Q: Can I use a MOSFET with lower continuous current rating than the primary device?

A: No. The primary device is rated for 38A continuous drain current. Substitute parts must deliver equal or higher current capability. Using a device with lower current rating will cause thermal stress, reduced reliability, and potential device failure. Current rating must be equal to or greater than the primary device specification.

Q: What is the difference between TO-247-3 and PLUS247™-3 packaging?

A: Both are through-hole packages with three leads (Gate, Drain, Source) suitable for TO-247-3 PCB footprints. PLUS247™-3 is a variant designation used by IXYS. Mechanical and electrical compatibility with standard TO-247-3 layouts is maintained. Verify PCB footprint dimensions with the device datasheet if substituting between these package variants.

Q: Why does the STWA50N65DM2AG have lower gate charge than some substitutes?

A: Gate charge is determined by the device's internal capacitance and switching characteristics. The primary device's 69nC specification reflects its specific die design and process technology. Substitute devices from different manufacturers may have higher gate charge due to different internal architectures. Lower gate charge reduces switching losses and gate driver stress, making it a desirable characteristic. When substituting with higher gate charge devices, verify gate driver capability.

Q: Can I use FCH077N65F-F085 as a direct replacement without circuit modification?

A: FCH077N65F-F085 is electrically compatible with the STWA50N65DM2AG for most applications. However, the higher gate charge (164nC versus 69nC) requires verification that your gate driver can supply the additional charge current. The higher continuous current rating (54A versus 38A) and power dissipation (481W versus 300W) provide design margin. No other circuit modifications are required if gate driver capability is confirmed.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer is discontinuing the product and will not support new applications. These devices may still be available from inventory but should not be selected for new circuit designs. Use only when substituting into existing designs where the part is already qualified and in production. For new applications, select devices with Active product status.

Q: Is the operating temperature range identical across all substitute parts?

A: Yes. All listed substitute parts operate across the -55°C to 150°C temperature range, matching the primary device. This ensures thermal compatibility across the full operating envelope. No thermal re-qualification is required when substituting between these devices based on temperature range alone.

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