IXFN44N50U3 Equivalent & Substitute Parts

Part Overview

The IXFN44N50U3 is an N-Channel MOSFET manufactured by IXYS, rated for 500V drain-to-source voltage with 44A continuous drain current at 25°C. This device is housed in a SOT-227B (miniBLOC) chassis mount package and is part of the HiPerFET™ series. The component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	500	V
Current - Continuous Drain (Id) @ 25°C	44	A (Tc)
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	120	mOhm @ 500mA, 10V
Vgs(th) (Max) @ Id	4	V @ 8mA
Gate Charge (Qg) (Max) @ Vgs	270	nC @ 10V
Power Dissipation (Max)	520	W (Tc)
Operating Temperature	-40 to 150	°C (TJ)
Mounting Type	Chassis Mount	—
Package / Case	SOT-227-4, miniBLOC	—

Substitute Part Grouping Explanation

Substitution of the IXFN44N50U3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) must be equal to or greater than 500V
Continuous Drain Current (Id) must be equal to or greater than 44A at 25°C
Gate drive voltage compatibility at 10V
Rds On performance at specified gate voltage and current conditions

Mechanical Compatibility Requirements:

Chassis mount configuration
Package compatibility with SOT-227 or equivalent miniBLOC form factor

Thermal Requirements:

Power dissipation capability and operating temperature range

The substitute parts listed below meet these criteria while offering active product status and improved availability compared to the obsolete IXFN44N50U3.

Parameter Comparison

Parameter	IXFN44N50U3	APT5010JVRU3	STE48NM50	STE53NC50	Unit
Manufacturer	IXYS	Microchip Technology	STMicroelectronics	STMicroelectronics	—
Product Status	Obsolete	Active	Active	Active	—
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	—
Drain to Source Voltage (Vdss)	500	500	550	500	V
Current - Continuous Drain (Id) @ 25°C	44	44	48	53	A (Tc)
Drive Voltage (Max Rds On)	10	10	10	10	V
Rds On (Max) @ Id, Vgs	120 @ 500mA, 10V	100 @ 22A, 10V	100 @ 24A, 10V	80 @ 27A, 10V	mOhm
Vgs(th) (Max) @ Id	4 @ 8mA	4 @ 2.5mA	5 @ 250µA	4 @ 250µA	V
Gate Charge (Qg) (Max) @ Vgs	270 @ 10V	312 @ 10V	117 @ 10V	434 @ 10V	nC
Vgs (Max)	±20	±30	±30	±30	V
Input Capacitance (Ciss) (Max) @ Vds	8400 @ 25V	7410 @ 25V	3700 @ 25V	11200 @ 25V	pF
Power Dissipation (Max)	520	450	450	460	W (Tc)
Operating Temperature	-40 to 150	-55 to 150	150	150	°C (TJ)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	—
Package / Case	SOT-227-4, miniBLOC	SOT-227-4, miniBLOC	ISOTOP	ISOTOP	—
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

APT5010JVRU3 (Microchip Technology)

The APT5010JVRU3 provides direct electrical and mechanical compatibility with the IXFN44N50U3. Both devices share identical Vdss (500V) and Id (44A) ratings, operate at 10V gate drive voltage, and utilize the SOT-227-4 miniBLOC package. The APT5010JVRU3 is classified as active product status with ROHS3 compliance and REACH unaffected designation. This part is suitable for direct replacement in existing designs without layout modifications.

STE48NM50 (STMicroelectronics)

The STE48NM50 offers higher voltage capability (550V Vdss) and increased current rating (48A Id), providing design margin above the IXFN44N50U3 specifications. This device uses the ISOTOP® package, which differs mechanically from the SOT-227B form factor and requires PCB layout redesign. The STE48NM50 is active product status with ROHS3 compliance. Selection of this part is appropriate when thermal performance and higher current capacity are design priorities and package transition is feasible.

STE53NC50 (STMicroelectronics)

The STE53NC50 delivers the highest current rating (53A Id) among substitute options while maintaining 500V Vdss matching the original part. This device features improved Rds On performance (80 mOhm) and operates within the same voltage class. The ISOTOP® package requires mechanical redesign similar to the STE48NM50. The STE53NC50 is active product status with ROHS3 compliance and represents the highest performance option for applications requiring maximum current capacity.

All substitute parts maintain REACH unaffected status and are classified as EAR99 for export control purposes, matching the regulatory profile of the original IXFN44N50U3.

Frequently Asked Questions (FAQ)

Q: Can the APT5010JVRU3 be used as a direct drop-in replacement for the IXFN44N50U3?

A: Yes. The APT5010JVRU3 shares identical electrical ratings (500V Vdss, 44A Id) and uses the same SOT-227-4 miniBLOC package. No PCB layout modifications are required for this substitution.

Q: What is the primary difference between the SOT-227B package used by IXFN44N50U3 and the ISOTOP package used by STE48NM50 and STE53NC50?

A: The SOT-227B and ISOTOP are distinct mechanical packages with different pin configurations and mounting interfaces. Substitution between these package types requires PCB redesign and cannot be performed as a direct replacement.

Q: Are the STMicroelectronics parts (STE48NM50 and STE53NC50) suitable for applications requiring the exact 44A current rating of the IXFN44N50U3?

A: Yes. Both STMicroelectronics parts exceed the 44A requirement (48A and 53A respectively) and are electrically compatible. The higher current ratings provide design margin and do not create incompatibility with circuits designed for 44A operation.

Q: What is the significance of the Rds On differences between substitute parts?

A: Rds On (on-state resistance) directly affects power dissipation and thermal performance. Lower Rds On values reduce heat generation. The STE53NC50 (80 mOhm) provides superior thermal performance compared to the IXFN44N50U3 (120 mOhm), while the APT5010JVRU3 (100 mOhm) offers intermediate performance.

Q: Do all substitute parts meet the same regulatory and compliance standards as the IXFN44N50U3?

A: All substitute parts maintain REACH unaffected status and EAR99 export classification matching the original part. The active substitute parts (APT5010JVRU3, STE48NM50, STE53NC50) additionally carry ROHS3 compliance certification.

Q: What is the impact of Gate Charge (Qg) differences on circuit design?

A: Gate charge affects gate drive circuit design and switching speed. The STE48NM50 has the lowest gate charge (117 nC), enabling faster switching, while the STE53NC50 has the highest (434 nC), requiring more robust gate drive capability. The APT5010JVRU3 (312 nC) falls between these values.

Q: Can the APT5010JVRU3 operate at the lower temperature range (-40°C) specified for the IXFN44N50U3?

A: The APT5010JVRU3 operates from -55°C to 150°C, which exceeds the IXFN44N50U3 temperature range of -40°C to 150°C. This provides extended low-temperature capability for applications requiring operation below -40°C.

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