IXFN32N120 N-Channel 1200V 32A MOSFET Equivalent & Substitute Parts

Part Overview

The IXFN32N120 is an N-Channel 1200V 32A MOSFET manufactured by IXYS in the HiPerFET™ series, housed in a SOT-227B chassis mount package. This device is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Alternative equivalent and substitute parts are necessary for ongoing production support, maintenance applications, and design continuity where this specific device is currently deployed.

Substiute Parts

IXFN32N120

IXYSIn Stock: 1419IXFN32N120 Datasheet

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IXFN32N120P

IXYSIn Stock: 68890IXFN32N120P Datasheet

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APT21M100J

Microchip TechnologyIn Stock: 1005APT21M100J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IXFN32N120 is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute must maintain a Drain to Source Voltage (Vdss) rating of 1200V or higher to ensure safe operation in the original application circuit.

Current Rating: The substitute must support a continuous drain current (Id) of 32A or greater at 25°C to handle the same load conditions.

On-State Resistance (Rds On): The substitute should maintain comparable or lower on-state resistance to preserve thermal performance and power dissipation characteristics.

Package and Mounting: The substitute must use a SOT-227B chassis mount package or equivalent form factor to ensure mechanical compatibility with existing PCB layouts and thermal management systems.

Compliance: The substitute must maintain ROHS3 compliance and MSL 1 rating to meet regulatory and handling requirements.

Two substitute parts meet these criteria: the IXFN32N120P (same manufacturer, active product status) and the APT21M100J (alternative manufacturer, with voltage and current trade-offs).

Parameter Comparison

Engineering Selection Recommendations

IXFN32N120P (IXYS): This is the primary equivalent substitute. It maintains identical voltage (1200V) and current (32A) ratings, operates in the same SOT-227B package, and carries Active product status. The IXFN32N120P features improved on-state resistance (310 mOhm vs. 350 mOhm) and reduced gate charge (360 nC vs. 400 nC), providing superior thermal and switching performance. Both devices are ROHS3 compliant with MSL 1 rating. This substitute is suitable for direct replacement in existing designs and new production runs.

APT21M100J (Microchip Technology): This substitute is available as an alternative when IXYS devices are unavailable. However, it presents electrical trade-offs: the voltage rating is reduced to 1000V (100V lower than the original), and the continuous drain current is reduced to 21A (11A lower than the original). The on-state resistance is slightly higher at 380 mOhm. The APT21M100J is housed in an ISOTOP® package, which is mechanically compatible with SOT-227-4 miniBLOC form factors. This substitute is suitable only for applications where the 1000V voltage rating and 21A current rating are sufficient. Both devices maintain ROHS3 compliance and MSL 1 rating.

All three devices are classified under ECCN EAR99 and HTSUS 8541.29.0095, ensuring consistent regulatory treatment.

Frequently Asked Questions (FAQ)

Q: Can the IXFN32N120P be used as a direct replacement for the IXFN32N120?

A: Yes. The IXFN32N120P is a direct equivalent substitute. Both devices share identical voltage (1200V) and current (32A) ratings, the same SOT-227B chassis mount package, and equivalent thermal characteristics. The IXFN32N120P is the recommended substitute due to its Active product status and improved electrical performance (lower Rds On and gate charge).

Q: What are the limitations of using the APT21M100J as a substitute?

A: The APT21M100J has two significant electrical limitations: the voltage rating is 1000V instead of 1200V, and the continuous drain current is 21A instead of 32A. These reductions mean the APT21M100J cannot be used in applications requiring the full 1200V voltage margin or 32A current capacity. Use this substitute only when the application circuit operates safely within 1000V and 21A limits.

Q: Are all three devices compatible with the same PCB layout?

A: The IXFN32N120 and IXFN32N120P use identical SOT-227B packages and are fully compatible with the same PCB layout. The APT21M100J uses an ISOTOP® package, which is mechanically compatible with the SOT-227-4 miniBLOC form factor but may require verification of thermal interface and mounting hardware compatibility with the original design.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. The IXFN32N120P and APT21M100J both maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and REACH Unaffected status, matching the original IXFN32N120 device. All three devices are classified under ECCN EAR99.

Q: Which substitute should be selected for new production?

A: The IXFN32N120P is the recommended choice for new production. It carries Active product status, maintains identical electrical specifications, and offers improved performance characteristics. The APT21M100J should be considered only as a secondary option when IXYS devices are unavailable and the application can tolerate reduced voltage and current ratings.

Q: How do the switching characteristics compare between the main part and substitutes?

A: The IXFN32N120P features lower gate charge (360 nC vs. 400 nC) and improved on-state resistance (310 mOhm vs. 350 mOhm), resulting in faster switching and reduced power dissipation. The APT21M100J has significantly lower gate charge (260 nC) and input capacitance (8500 pF), enabling faster switching but with reduced current capacity. Gate threshold voltage varies slightly across all three devices (5V to 6.5V range), which may require minor gate drive circuit adjustments in sensitive applications.