IXFE39N90 Equivalent & Substitute Parts

Part Overview

The IXFE39N90 is an N-Channel MOSFET rated for 900V drain-to-source voltage with 34A continuous drain current in a chassis-mount SOT-227B package. This device is part of the IXYS HiPerFET™ series and is classified as obsolete. Due to its obsolete status, equivalent substitute parts with compatible electrical and mechanical specifications are necessary for ongoing design support and procurement continuity.

Substiute Parts

IXFE39N90

IXYSIn Stock: 906IXFE39N90 Datasheet

Current PartRFQ

IXFN44N100P

IXYSIn Stock: 826IXFN44N100P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFE39N90 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) must equal or exceed 900V
• Continuous Drain Current (Id) must equal or exceed 34A
• On-State Resistance (Rds On) must not exceed the original specification to maintain thermal performance
• Gate Charge (Qg) characteristics must be compatible with existing gate drive circuitry
• Operating temperature range must encompass the original -40°C to 150°C specification

Mechanical Compatibility Criteria:

• Package type must be SOT-227B (miniBLOC) for direct board-level compatibility
• Mounting type must be Chassis Mount
• Pin configuration must match the original SOT-227-4 footprint

The IXFN44N100P meets these substitution criteria through equivalent package geometry, compatible pin configuration, and electrical parameters that maintain or exceed the original device specifications.

Parameter Comparison

Engineering Selection Recommendations

The IXFN44N100P is a direct substitute for the IXFE39N90 based on the following engineering criteria:

Electrical Performance: The IXFN44N100P provides equivalent or superior electrical characteristics across all critical parameters. The 1000V Vdss rating exceeds the original 900V requirement, providing additional voltage margin. The 37A continuous drain current exceeds the 34A specification. The on-state resistance remains at 220 mOhm, maintaining thermal performance equivalence. The lower gate charge (305 nC versus 375 nC) reduces gate drive power requirements.

Mechanical Compatibility: Both devices utilize the identical SOT-227B (miniBLOC) package with chassis-mount configuration, ensuring direct board-level compatibility without layout modifications.

Product Status and Compliance: The IXFN44N100P holds Active product status, ensuring long-term availability and supply chain continuity. The substitute part is ROHS3 Compliant and maintains REACH Unaffected status, matching the regulatory compliance profile of the original device.

Thermal Performance: The increased power dissipation rating (890W versus 580W) and extended operating temperature range (-55°C to 150°C) provide enhanced thermal headroom for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the IXFN44N100P be used as a direct replacement for the IXFE39N90 without circuit modifications?

A: Yes. Both devices share identical SOT-227B package geometry, chassis-mount configuration, and pin assignments. The electrical parameters of the substitute meet or exceed the original specifications, requiring no circuit redesign.

Q: What is the significance of the higher Vdss rating (1000V) on the substitute part?

A: The higher voltage rating provides additional safety margin in applications operating near the 900V limit. This does not negatively impact circuit performance and is fully backward compatible.

Q: How does the lower gate charge (305 nC) on the IXFN44N100P affect gate drive design?

A: Lower gate charge reduces the energy required to switch the device, potentially decreasing gate drive power dissipation and allowing faster switching transitions. Existing gate drive circuits designed for the original 375 nC specification will operate within acceptable parameters.

Q: Are there any thermal considerations when substituting the IXFN44N100P?

A: The substitute part has a higher power dissipation rating (890W versus 580W) and extended temperature range (-55°C to 150°C). These characteristics provide improved thermal performance and do not impose additional cooling requirements beyond the original design.

Q: What is the difference between the HiPerFET™ and HiPerFET™ Polar series designations?

A: Both designations indicate membership in the IXYS HiPerFET™ family of high-performance MOSFETs. The Polar designation on the substitute part indicates additional performance optimization. Both are electrically and mechanically compatible.

Q: Is the IXFN44N100P available in the same packaging format as the IXFE39N90?

A: Yes. Both devices are supplied in SOT-227B (miniBLOC) chassis-mount packages. The IXFN44N100P is available in Tube packaging, ensuring component protection during handling and storage.

Q: Why is the original IXFE39N90 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The IXFN44N100P represents the current-generation equivalent, offering improved specifications and guaranteed long-term availability.