STW40NF20 Equivalent & Substitute Parts

Part Overview

The STW40NF20 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 200V drain-to-source voltage and 40A continuous drain current in a TO-247-3 through-hole package. This device is part of the STripFET™ series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	40	A
On-State Resistance (Rds On) @ 20A, 10V	45	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	75	nC
Power Dissipation (Max)	160	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-247-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the STW40NF20 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss) must equal or exceed 200V
Continuous Drain Current (Id) must equal or exceed 40A at 25°C
On-State Resistance (Rds On) must not exceed 45mOhm at the specified gate voltage
Gate Threshold Voltage (Vgs(th)) must be compatible at 4V nominal
Operating temperature range must encompass -55°C to 150°C minimum

Mechanical Compatibility Requirements:

Package must be TO-247-3 or equivalent through-hole variant
Mounting type must be through-hole
Pin configuration must be compatible with TO-247-3 standard

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalent (Same Manufacturer) The STP40NF20 from STMicroelectronics maintains identical electrical specifications but uses a TO-220 package instead of TO-247-3. This represents a direct functional equivalent with different thermal and mechanical packaging.

Category 2: Cross-Manufacturer Equivalents (TO-247 Package) Parts from Infineon Technologies (IRFP260 series), Microchip Technology (APT20M45 series), and IXYS (IXFH series) meet or exceed the electrical requirements while maintaining TO-247-3 package compatibility. These parts feature equal or superior current ratings, voltage ratings, and thermal performance.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Package	Status
STW40NF20	STMicroelectronics	200	40	45	75	160	TO-247-3	Obsolete
STP40NF20	STMicroelectronics	200	40	45	75	160	TO-220	Active
APT20M45BVFRG	Microchip Technology	200	56	45	195	300	TO-247-3	Active
APT20M45BVRG	Microchip Technology	200	56	45	195	300	TO-247-3	Active
IRFP260MPBF	Infineon Technologies	200	50	40	234	300	TO-247-3	Active
IRFP260NPBF	Infineon Technologies	200	50	40	234	300	TO-247-3	Active
IRFP260PBF	Vishay Siliconix	200	46	55	230	280	TO-247-3	Active
IXFH50N20	IXYS	200	50	45	220	300	TO-247-3	Active
IXFH58N20	IXYS	200	58	40	220	300	TO-247-3	Active
IXFH70N20Q3	IXYS	200	70	40	67	690	TO-247-3	Active
IXFH74N20P	IXYS	200	74	34	107	480	TO-247-3	Active

Engineering Selection Recommendations

For Direct Package Compatibility (TO-247-3):

The IRFP260MPBF and IRFP260NPBF from Infineon Technologies are the primary recommended substitutes. Both devices maintain 200V Vdss rating, exceed the 40A continuous drain current requirement at 50A, and feature superior on-state resistance of 40mOhm compared to the original 45mOhm specification. Both parts are ROHS3 compliant and carry active product status with extensive inventory availability (40,300 and 65,300 units respectively).

The IXFH50N20 from IXYS provides equivalent electrical performance with 50A continuous drain current and 45mOhm on-state resistance in TO-247-3 package. This part is ROHS3 compliant and active.

The IXFH58N20 from IXYS offers enhanced current capability at 58A with improved on-state resistance of 40mOhm, maintaining full TO-247-3 compatibility and ROHS3 compliance.

For Enhanced Thermal Performance:

The APT20M45BVFRG and APT20M45BVRG from Microchip Technology provide 56A continuous drain current with 300W power dissipation (compared to 160W in the original), enabling superior thermal management in demanding applications. Both maintain 200V Vdss and 45mOhm on-state resistance specifications.

The IXFH70N20Q3 and IXFH74N20P from IXYS deliver significantly higher power dissipation ratings (690W and 480W respectively) with improved on-state resistance characteristics, suitable for high-power applications requiring thermal headroom.

For Package Variant (TO-220):

The STP40NF20 from STMicroelectronics provides identical electrical specifications to the original STW40NF20 but in TO-220 package. This option is suitable only when PCB layout and thermal management accommodate the TO-220 form factor. This part is ROHS3 compliant and active.

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8541.29.0095) to the original part.

Frequently Asked Questions (FAQ)

Q: Can the STP40NF20 be used as a direct replacement for the STW40NF20?

A: The STP40NF20 provides identical electrical specifications (200V, 40A, 45mOhm Rds On, 160W power dissipation) but uses a TO-220 package instead of TO-247-3. Substitution is possible only if the PCB layout and thermal design accommodate the TO-220 form factor. The TO-220 package has different pin spacing and thermal characteristics compared to TO-247-3.

Q: What is the primary advantage of using IRFP260MPBF or IRFP260NPBF over the original STW40NF20?

A: Both IRFP260 variants maintain the 200V voltage rating and TO-247-3 package compatibility while providing 50A continuous drain current (25% higher than the original 40A) and superior on-state resistance of 40mOhm (compared to 45mOhm). Both parts are active products with extensive inventory availability and ROHS3 compliance.

Q: Are there performance differences between IXFH50N20 and IXFH58N20?

A: Both parts maintain 200V Vdss and TO-247-3 package compatibility. The IXFH58N20 provides higher continuous drain current at 58A (versus 50A) and improved on-state resistance of 40mOhm (versus 45mOhm). Gate charge is identical at 220nC for both devices. Selection depends on application current requirements and thermal design margins.

Q: Why do some substitute parts have higher gate charge (Qg) values?

A: Gate charge is determined by device design and die size. Higher gate charge values (such as 195nC in APT20M45 series or 234nC in IRFP260 series) reflect larger die areas that enable higher current ratings and improved thermal performance. This does not affect substitution compatibility but may require gate driver adjustment in high-frequency switching applications.

Q: Can IXFH70N20Q3 or IXFH74N20P be used in place of STW40NF20?

A: Yes. Both devices exceed all electrical requirements with 70A and 74A continuous drain current respectively, maintain 200V Vdss, and provide TO-247-3 package compatibility. The primary consideration is that these parts feature significantly higher power dissipation ratings (690W and 480W) and lower on-state resistance (40mOhm and 34mOhm), making them suitable for applications requiring enhanced thermal performance or lower conduction losses.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. These certifications match the original STW40NF20 specifications, ensuring regulatory compatibility for replacement in existing designs.

Q: Is there a performance difference between APT20M45BVFRG and APT20M45BVRG?

A: Both parts are electrically identical with 200V Vdss, 56A continuous drain current, 45mOhm on-state resistance, and 300W power dissipation in TO-247-3 package. The difference lies in packaging and inventory availability (893 units for BVFRG versus 3,431 units for BVRG). Selection should be based on supply chain requirements and lead time considerations.

Q: What is the operating temperature range compatibility for substitutes?

A: The original STW40NF20 operates from -55°C to 150°C. Most substitute parts maintain this range or exceed it. IRFP260MPBF and IRFP260NPBF extend to 175°C, and IXFH74N20P also reaches 175°C. All other substitutes maintain the -55°C to 150°C range. Verify application temperature requirements before selection.

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