IXFR150N15 Equivalent & Substitute Parts

Part Overview

The IXFR150N15 is an N-Channel MOSFET rated for 150V drain-to-source voltage with a continuous drain current of 105A at 25°C. This device is manufactured by IXYS and features the HiPerFET™ series technology in an ISOPLUS247™ package configuration. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. Substitute parts must maintain compatibility across critical electrical parameters including voltage rating, current capacity, and thermal characteristics while accommodating package variations.

Substiute Parts

IXFR150N15

IXYSIn Stock: 735IXFR150N15 Datasheet

Current PartRFQ

IRFP4321PBF

Infineon TechnologiesIn Stock: 2308IRFP4321PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IXFR150N15 is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute part must maintain a Drain to Source Voltage (Vdss) rating of 150V or higher to ensure safe operation across all specified application conditions.

Current Capacity: The substitute part must support a continuous drain current (Id) at 25°C that meets or exceeds the application requirements. The IXFR150N15 specifies 105A; substitute parts with lower current ratings require application-level verification of thermal and electrical margins.

Package and Mounting: Both the main part and substitute must use through-hole mounting in TO-247-3 package configuration to ensure mechanical and thermal interface compatibility with existing PCB designs and heatsink assemblies.

Thermal Performance: Power dissipation capability and operating temperature range must support the thermal environment of the target application. The IXFR150N15 specifies 400W maximum power dissipation and -55°C to 150°C operating range.

Gate Drive Characteristics: Gate charge (Qg) and gate threshold voltage (Vgs(th)) must be compatible with the gate drive circuit design to ensure proper switching performance and reliability.

The IRFP4321PBF meets the voltage rating and package requirements but exhibits reduced continuous current capacity (78A versus 105A) and lower power dissipation (310W versus 400W). This substitute is suitable for applications where the actual operating current does not exceed the substitute part's rating.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs:

The IRFP4321PBF is the recommended substitute for the obsolete IXFR150N15. This part is manufactured by Infineon Technologies and maintains active product status, ensuring long-term availability and supply chain stability. Both devices share identical voltage ratings (150V Vdss) and package configurations (TO-247-3 through-hole), enabling direct mechanical and thermal interface compatibility.

Current Capacity Considerations:

The IRFP4321PBF provides 78A continuous drain current compared to the IXFR150N15's 105A rating. Applications operating at or below 78A require no circuit modification. Applications requiring the full 105A capacity of the original part must either accept reduced current margin or implement parallel device configurations with appropriate current-sharing networks.

Compliance and Regulatory Status:

The IRFP4321PBF is RoHS3 compliant and maintains REACH Unaffected status, matching the regulatory profile of the original part. Both devices carry EAR99 export classification and identical HTSUS commodity codes, supporting consistent procurement and compliance documentation.

Thermal Performance:

The IRFP4321PBF supports an extended operating temperature range (-55°C to 175°C) compared to the IXFR150N15 (-55°C to 150°C), providing additional thermal margin in high-temperature environments. However, the reduced power dissipation rating (310W versus 400W) requires verification that thermal design margins remain adequate for the target application.

Gate Drive Compatibility:

The IRFP4321PBF exhibits lower gate charge (110nC versus 360nC) and input capacitance (4460pF versus 9100pF), resulting in faster switching transitions and reduced gate drive power requirements. Existing gate drive circuits designed for the IXFR150N15 will operate with improved performance characteristics when driving the IRFP4321PBF.

Frequently Asked Questions (FAQ)

Q: Can the IRFP4321PBF directly replace the IXFR150N15 in existing designs?

A: Direct mechanical and thermal replacement is supported due to identical TO-247-3 package configuration and through-hole mounting. Electrical compatibility depends on application current requirements. If the application operates at or below 78A continuous drain current, the IRFP4321PBF is a direct functional substitute. Applications requiring sustained current above 78A must implement design modifications such as parallel device configurations or circuit redesign.

Q: What are the implications of the lower gate charge specification in the IRFP4321PBF?

A: The IRFP4321PBF gate charge of 110nC (versus 360nC in the IXFR150N15) results in reduced switching time and lower gate drive power dissipation. Existing gate drive circuits will operate with improved efficiency and faster switching transitions. No gate drive circuit modifications are required; the substitute part is compatible with gate drive designs specified for the original part.

Q: How does the reduced power dissipation rating affect thermal design?

A: The IRFP4321PBF maximum power dissipation is 310W compared to 400W for the IXFR150N15. Thermal design margins must be recalculated based on actual application power dissipation. If the application dissipates less than 310W, no heatsink modification is required. Applications approaching or exceeding 310W dissipation require verification that existing heatsink thermal resistance remains adequate for the substitute part.

Q: Are there package or pinout differences between these devices?

A: Both devices use TO-247-3 package configuration with identical pinout and mechanical dimensions. No PCB layout modifications are required for mechanical compatibility. Thermal interface characteristics are equivalent, supporting direct heatsink mounting without modification.

Q: What is the impact of the higher gate threshold voltage in the IRFP4321PBF?

A: The IRFP4321PBF gate threshold voltage is 5V (at 250µA) compared to 4V (at 8mA) in the IXFR150N15. This represents a 1V increase in the minimum gate voltage required to initiate conduction. Gate drive circuits designed for the IXFR150N15 will operate with the IRFP4321PBF without modification, as typical gate drive voltages (10V to 15V) exceed both threshold specifications with adequate margin.

Q: Does the extended operating temperature range of the IRFP4321PBF provide additional design flexibility?

A: The IRFP4321PBF supports operation to 175°C junction temperature compared to 150°C for the IXFR150N15. This extended range provides additional thermal margin in high-temperature environments. Applications operating near the 150°C limit of the original part benefit from the additional 25°C margin available with the substitute part.

Q: What is the significance of the different Rds On measurement conditions between these parts?

A: The IXFR150N15 specifies Rds On at 75A and 10V gate voltage, while the IRFP4321PBF specifies Rds On at 33A and 10V gate voltage. The IRFP4321PBF exhibits higher on-state resistance (15.5mOhm versus 12.5mOhm) at its specified measurement point. However, on-state resistance varies with drain current; direct comparison requires evaluation at the actual operating current of the application.