IXFN44N50 N-Channel 500V 44A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFN44N50 is an N-Channel MOSFET manufactured by IXYS, rated for 500V drain-to-source voltage and 44A continuous drain current in a SOT-227B chassis mount package. This device is part of the HiPerFET™ series and is classified as not for new designs, indicating it has been superseded in the manufacturer's product roadmap. Equivalent and substitute parts are necessary for applications requiring continued component availability, design flexibility, or performance optimization within the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	44	A (Tc)
On-State Resistance (Rds On Max) @ 10V	120	mOhm
Gate Threshold Voltage (Vgs(th)) @ 8mA	4	V
Gate Charge (Qg) @ 10V	270	nC
Power Dissipation (Max)	520	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Chassis Mount	—
Package Type	SOT-227-4, miniBLOC	—

Substitute Part Grouping Explanation

Substitution of the IXFN44N50 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 500V minimum
Continuous Drain Current (Id): 44A or greater
On-State Resistance (Rds On): 120 mOhm or lower at specified gate voltage
Gate Threshold Voltage (Vgs(th)): Compatible with 4V to 5.5V range
Mounting Type: Chassis Mount
Package Compatibility: SOT-227-4, miniBLOC, or ISOTOP® (mechanically compatible variants)

Secondary Considerations:

Gate Charge (Qg): Lower values indicate faster switching
Power Dissipation: 520W or greater capacity
Operating Temperature: -55°C to 150°C minimum range
RoHS3 Compliance and REACH Unaffected status

Substitute parts are grouped into two categories: direct SOT-227B package equivalents and mechanically compatible ISOTOP® package alternatives. All listed substitutes maintain the same voltage rating and meet or exceed the current rating and thermal performance of the IXFN44N50.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Vgs(th) (V)	Qg @ 10V (nC)	Power Diss. (W)	Package	Product Status
IXFN44N50	IXYS	500	44	120	4	270	520	SOT-227B	Not For New Designs
IXFN64N50P	IXYS	500	61	85	5.5	150	700	SOT-227B	Active
VS-FA40SA50LC	Vishay	500	40	130	4	420	543	SOT-227	Active
APT5010JLL	Microchip	500	41	100	5	95	—	ISOTOP®	Active
APT5010JVR	Microchip	500	44	100	4	470	—	ISOTOP®	Active
STE48NM50	STMicroelectronics	550	48	100	5	117	450	ISOTOP®	Active
STE53NC50	STMicroelectronics	500	53	80	4	434	460	ISOTOP®	Active

Engineering Selection Recommendations

Direct Package Equivalent (SOT-227B):

The IXFN64N50P is the primary active-status equivalent from IXYS. It maintains the same 500V voltage rating and SOT-227B package footprint while providing superior electrical performance: 61A current rating (39% higher), 85 mOhm on-state resistance (29% lower), and 700W power dissipation (35% higher). This part is suitable for direct replacement in applications where the increased current capacity and reduced losses are beneficial. The IXFN64N50P carries Active product status and full RoHS3 compliance.

The VS-FA40SA50LC from Vishay provides a conservative alternative with 40A current rating and 130 mOhm on-state resistance. This part is appropriate for applications with lower current demands or where thermal management is less critical. It maintains SOT-227 package compatibility and Active product status.

ISOTOP® Package Alternatives:

The APT5010JVR from Microchip provides an exact current rating match (44A) with improved on-state resistance (100 mOhm) and ISOTOP® package mounting. This part is suitable for applications where the ISOTOP® package offers superior thermal performance or mechanical advantages over SOT-227B.

The STE53NC50 from STMicroelectronics offers the highest current rating (53A) and lowest on-state resistance (80 mOhm) among all substitutes, with 500V voltage rating and ISOTOP® package. This part is appropriate for applications requiring maximum current capacity and efficiency.

The STE48NM50 from STMicroelectronics provides a 550V voltage rating (10% margin above the IXFN44N50) with 48A current capability and 100 mOhm on-state resistance in ISOTOP® package. This part is suitable for applications requiring enhanced voltage headroom.

All recommended substitutes carry Active product status, RoHS3 compliance, and REACH Unaffected designation.

Frequently Asked Questions (FAQ)

Q: Can the IXFN64N50P directly replace the IXFN44N50 in existing designs?

A: Yes. The IXFN64N50P maintains identical 500V voltage rating and SOT-227B package footprint. The higher current rating (61A vs. 44A) and lower on-state resistance (85 mOhm vs. 120 mOhm) provide improved performance margins. Thermal design should be verified to ensure the increased power dissipation capability does not create thermal management issues in the application.

Q: What is the difference between SOT-227B and ISOTOP® packages?

A: Both are chassis mount packages with SOT-227-4 or miniBLOC mechanical compatibility. The ISOTOP® package is a variant offering different thermal and mechanical mounting characteristics. Parts using ISOTOP® packaging (APT5010JVR, STE48NM50, STE53NC50) are mechanically compatible with SOT-227B applications but require verification of mounting hardware and thermal interface specifications.

Q: Is the VS-FA40SA50LC suitable for applications requiring 44A continuous current?

A: No. The VS-FA40SA50LC is rated for 40A continuous drain current, which is below the IXFN44N50 specification of 44A. This part is suitable only for applications with maximum current requirements of 40A or lower.

Q: Which substitute offers the best on-state resistance performance?

A: The STE53NC50 provides the lowest on-state resistance at 80 mOhm, representing a 33% improvement over the IXFN44N50 (120 mOhm). This results in reduced conduction losses and improved efficiency in switching applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant status and REACH Unaffected designation, meeting current environmental and regulatory requirements.

Q: What is the significance of the "Not For New Designs" status of the IXFN44N50?

A: This designation indicates the IXFN44N50 has been superseded in the IXYS product portfolio. While existing inventory remains available, new designs should utilize active-status alternatives such as the IXFN64N50P or other listed substitutes to ensure long-term component availability and access to manufacturer support.

Q: Can the APT5010JLL be used as a substitute despite its lower current rating?

A: The APT5010JLL is rated for 41A continuous current, which is below the IXFN44N50 specification of 44A. It is suitable only for applications with maximum current requirements of 41A or lower. The APT5010JVR, rated for 44A, is the appropriate Microchip alternative for exact current matching.

Q: Does the STE48NM50 higher voltage rating (550V vs. 500V) affect compatibility?

A: No. The 550V rating provides a 10% voltage margin above the IXFN44N50 specification and is fully compatible with 500V applications. This higher rating offers additional design margin for transient voltage conditions without any negative effects on circuit operation.

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