IXFL44N60 Equivalent & Substitute Parts

Part Overview

The IXFL44N60 is an N-Channel 600V 41A MOSFET manufactured by IXYS in the HiPerFET™ series, housed in the ISOPLUS264™ package. This device is rated for 500W power dissipation and operates across a temperature range of -55°C to 150°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design considerations.

Substiute Parts

IXFL44N60

IXYSIn Stock: 823IXFL44N60 Datasheet

Current PartRFQ

IPW60R099CPAFKSA1

Infineon TechnologiesIn Stock: 989IPW60R099CPAFKSA1 Datasheet

SimilarRFQ

SPW35N60CFDFKSA1

Infineon TechnologiesIn Stock: 1203SPW35N60CFDFKSA1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFL44N60 is determined by strict alignment of electrical and mechanical parameters within the N-Channel 600V MOSFET category. The critical substitution criteria are:

Electrical Parameters:

• Drain to Source Voltage (Vdss): Must equal 600V
• Continuous Drain Current (Id): Must meet or exceed 41A at 25°C
• On-State Resistance (Rds On): Must not exceed 130mOhm at rated conditions
• Gate Threshold Voltage (Vgs(th)): Must remain within ±20V gate voltage specification
• Power Dissipation: Must support thermal requirements of the application

Mechanical Parameters:

• Mounting Type: Through Hole configuration required
• Package Compatibility: Physical footprint and pin configuration must accommodate board layout

The identified substitute parts—IPW60R099CPAFKSA1 and SPW35N60CFDFKSA1—satisfy the 600V voltage class and N-Channel topology. Both are through-hole mounted devices with compatible gate voltage specifications. However, each presents distinct trade-offs in current rating, on-state resistance, and thermal performance relative to the original IXFL44N60.

Parameter Comparison

Engineering Selection Recommendations

IPW60R099CPAFKSA1 (Infineon CoolMOS™)

This device is classified as Active and carries AEC-Q101 automotive qualification. The IPW60R099CPAFKSA1 delivers superior on-state resistance performance (105mOhm) and significantly reduced gate charge (80nC), resulting in lower switching losses and improved thermal efficiency. However, the continuous drain current rating of 31A falls below the IXFL44N60 specification of 41A, and maximum power dissipation is limited to 255W. This substitute is suitable for applications where current and thermal requirements do not exceed these limits. The lower operating temperature minimum (-40°C versus -55°C) must be evaluated against system requirements. Active product status ensures ongoing availability and technical support.

SPW35N60CFDFKSA1 (Infineon CoolMOS™)

This device is classified as Not For New Designs but remains available. The SPW35N60CFDFKSA1 provides a closer current rating match at 34.1A and intermediate on-state resistance of 118mOhm. Power dissipation capability of 313W exceeds the IPW60R099CPAFKSA1 but remains below the original IXFL44N60. The operating temperature range of -55°C to 150°C matches the original specification. Gate charge of 212nC represents a middle ground between the other two devices. This substitute is applicable for legacy system maintenance where new design constraints do not apply.

Both substitutes comply with RoHS3, REACH, and moisture sensitivity requirements equivalent to the original part. Package transition from ISOPLUS264™ to TO-247-3 requires mechanical board layout verification.

Frequently Asked Questions (FAQ)

Q: Can the IPW60R099CPAFKSA1 directly replace the IXFL44N60 in all applications?

A: The IPW60R099CPAFKSA1 is electrically compatible at the 600V voltage class and N-Channel topology. However, the 31A continuous drain current rating is 24% lower than the IXFL44N60 specification of 41A. Applications requiring the full 41A rating cannot use this substitute. Additionally, the package changes from ISOPLUS264™ to TO-247-3, requiring board layout modification. Thermal design must account for the reduced 255W power dissipation limit.

Q: What are the advantages of the SPW35N60CFDFKSA1 over the IPW60R099CPAFKSA1?

A: The SPW35N60CFDFKSA1 provides higher continuous drain current (34.1A versus 31A) and greater power dissipation capability (313W versus 255W). The operating temperature minimum of -55°C matches the original IXFL44N60, whereas the IPW60R099CPAFKSA1 is limited to -40°C. Gate charge of 212nC is higher than the IPW60R099CPAFKSA1 (80nC) but lower than the original part (330nC), affecting switching speed and efficiency characteristics.

Q: Does the package change from ISOPLUS264™ to TO-247-3 affect electrical performance?

A: Package geometry does not alter electrical performance characteristics. However, the physical footprint and pin configuration differ significantly. TO-247-3 packages have different thermal coupling to the PCB and may require modified heatsinking arrangements. Board layout must be verified for mechanical compatibility, including mounting hole spacing and clearance requirements.

Q: Are both substitute parts suitable for new designs?

A: The IPW60R099CPAFKSA1 is classified as Active and is suitable for new designs. The SPW35N60CFDFKSA1 is classified as Not For New Designs and should be used only for legacy system support and maintenance applications. For new designs, the IPW60R099CPAFKSA1 is the recommended choice, subject to current and thermal requirements validation.

Q: How do gate charge differences affect circuit design?

A: The IXFL44N60 has gate charge of 330nC, the IPW60R099CPAFKSA1 has 80nC, and the SPW35N60CFDFKSA1 has 212nC. Lower gate charge reduces driver power requirements and enables faster switching transitions. If the original circuit design relies on specific gate charge characteristics for timing or driver current calculations, substitution with significantly different gate charge values requires driver circuit re-evaluation.

Q: What compliance certifications are maintained across all three devices?

A: All three devices are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. The IPW60R099CPAFKSA1 additionally carries AEC-Q101 automotive qualification. These certifications ensure regulatory compliance and supply chain consistency across substitution options.