IXFN44N50U2 Equivalent & Substitute Parts

Part Overview

The IXFN44N50U2 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 part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

IXFN44N50U2

IXYSIn Stock: 1050IXFN44N50U2 Datasheet

Current PartRFQ

APT5010JVRU3

Microchip TechnologyIn Stock: 821APT5010JVRU3 Datasheet

SimilarRFQ

STE48NM50

STMicroelectronicsIn Stock: 1678STE48NM50 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFN44N50U2 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• FET Type: N-Channel
• Drain to Source Voltage (Vdss): 500V minimum
• Continuous Drain Current (Id): 44A minimum at 25°C
• Drive Voltage: 10V
• Mounting Type: Chassis Mount
• Package compatibility: SOT-227 or equivalent miniBLOC form factor

Acceptable Variation Parameters:

• Rds On (Max): Equal to or lower than 120 mOhm
• Power Dissipation: Equal to or greater than 520W
• Operating Temperature Range: Must encompass -40°C to 150°C minimum
• Gate Charge (Qg): Variation acceptable within thermal and switching performance constraints
• Input Capacitance (Ciss): Variation acceptable within circuit design parameters

The substitute parts listed below meet or exceed these critical parameters while maintaining functional equivalence for the IXFN44N50U2 in standard applications.

Parameter Comparison

Engineering Selection Recommendations

APT5010JVRU3 (Microchip Technology)

The APT5010JVRU3 provides direct electrical and mechanical compatibility with the IXFN44N50U2. Both devices share identical Vdss (500V), Id (44A), and drive voltage (10V) specifications. The APT5010JVRU3 features improved Rds On performance (100 mOhm versus 120 mOhm) and maintains the same SOT-227-4 miniBLOC package form factor. This part is currently in active production status and carries ROHS3 compliance certification. The extended operating temperature range (-55°C to 150°C) provides additional thermal margin. This substitute is recommended for direct replacement in existing designs without layout or thermal management modifications.

STE48NM50 (STMicroelectronics)

The STE48NM50 offers electrical compatibility with enhanced performance characteristics. This device exceeds the IXFN44N50U2 specifications in Vdss (550V versus 500V) and Id (48A versus 44A), providing design margin for higher voltage and current applications. The STE48NM50 features significantly lower gate charge (117 nC versus 270 nC) and input capacitance (3700 pF versus 8400 pF), resulting in faster switching performance and reduced drive circuit requirements. The device is housed in an ISOTOP package rather than SOT-227-4, requiring PCB layout and thermal management evaluation. This part is in active production with ROHS3 compliance. The STE48NM50 is suitable for applications where improved switching speed and higher voltage/current ratings provide system benefits.

Frequently Asked Questions (FAQ)

Q: Can the APT5010JVRU3 be used as a direct drop-in replacement for the IXFN44N50U2?

A: Yes. Both devices share identical Vdss (500V), Id (44A), and drive voltage (10V) specifications. The APT5010JVRU3 is housed in the same SOT-227-4 miniBLOC package and maintains compatible pinout. No PCB layout modifications are required.

Q: What are the key differences between the APT5010JVRU3 and STE48NM50?

A: The APT5010JVRU3 maintains identical electrical ratings to the IXFN44N50U2 and uses the same SOT-227-4 package. The STE48NM50 offers higher Vdss (550V) and Id (48A) ratings, lower gate charge (117 nC), and lower input capacitance (3700 pF), but uses a different ISOTOP package requiring PCB layout evaluation.

Q: Does the STE48NM50 require PCB layout changes?

A: Yes. The STE48NM50 uses an ISOTOP package instead of the SOT-227-4 miniBLOC package. PCB footprint, thermal management, and mounting hardware must be re-evaluated and modified accordingly.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the APT5010JVRU3 and STE48NM50 carry ROHS3 compliance certification. The original IXFN44N50U2 RoHS status is not specified in the provided data.

Q: What is the impact of lower gate charge in the STE48NM50?

A: Lower gate charge (117 nC versus 270 nC) reduces the charge required to switch the device on and off, resulting in faster switching transitions and reduced drive circuit power dissipation. This may improve overall system efficiency in high-frequency switching applications.

Q: Can I use the STE48NM50 in a circuit designed for the IXFN44N50U2 without circuit modifications?

A: Electrical substitution is possible due to compatible Vdss and Id ratings. However, the different package (ISOTOP versus SOT-227-4) requires PCB layout and thermal management re-evaluation. Additionally, the lower gate charge and input capacitance may require drive circuit optimization for optimal performance.

Q: What is the operating temperature range difference between the substitutes?

A: The IXFN44N50U2 operates from -40°C to 150°C. The APT5010JVRU3 extends this range to -55°C to 150°C, providing additional low-temperature margin. The STE48NM50 specifies 150°C maximum without a minimum temperature specification in the provided data.

Q: Which substitute should I select for a new design?

A: For direct replacement of existing IXFN44N50U2 designs, select the APT5010JVRU3. For new designs where improved switching performance and higher voltage/current ratings provide system benefits, evaluate the STE48NM50 with full PCB layout and thermal management assessment.