APT4F120K Equivalent & Substitute Parts

Part Overview

The APT4F120K is an N-Channel 1200V 4A MOSFET manufactured by Microchip Technology in a Through Hole TO-220-3 package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement. The APT4F120K serves applications requiring high-voltage switching with moderate current handling in thermal management and power conversion circuits.

Substiute Parts

APT4F120K

Microchip TechnologyIn Stock: 200606APT4F120K Datasheet

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IXFP3N120

IXYSIn Stock: 1133IXFP3N120 Datasheet

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IXTP3N120

IXYSIn Stock: 5389IXTP3N120 Datasheet

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STP3NK90Z

STMicroelectronicsIn Stock: 41570STP3NK90Z Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the APT4F120K is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain to Source Voltage (Vdss): Minimum 1200V for direct substitution
• Continuous Drain Current (Id): Minimum 4A at 25°C for equivalent current handling
• Package Type: TO-220-3 Through Hole for mechanical compatibility
• Operating Temperature Range: -55°C to 150°C minimum
• Gate Drive Voltage: 10V maximum Rds On specification

Substitution Categories:

Category 1 - Full Electrical Equivalents (1200V, ≥3A): Parts meeting or exceeding the 1200V Vdss specification with comparable current ratings and thermal characteristics. These devices maintain voltage class compatibility and support equivalent application requirements.

Category 2 - Reduced Voltage Alternatives (900V, ≥3A): Parts with reduced Vdss specification (900V) suitable only for applications where maximum voltage stress does not exceed 900V. These devices are not interchangeable in circuits requiring full 1200V rating.

The IXFP3N120 and IXTP3N120 (both IXYS HiPerFET™ series) operate at 1200V with 3A continuous drain current, representing reduced current capacity compared to the APT4F120K. The STP3NK90Z (STMicroelectronics SuperMESH™) operates at 900V with 3A, representing both reduced voltage and current capacity.

Parameter Comparison

Engineering Selection Recommendations

IXFP3N120 and IXTP3N120 Selection:

Both IXYS HiPerFET™ devices (IXFP3N120 and IXTP3N120) maintain the 1200V Vdss specification of the APT4F120K and are classified as Active products with ROHS3 compliance. These parts are suitable for applications where the APT4F120K's 4A continuous drain current can be reduced to 3A without circuit redesign. The 1200V voltage class ensures compatibility with existing high-voltage switching applications. Both devices operate across the identical -55°C to 150°C temperature range and utilize the same TO-220-3 package.

The IXFP3N120 provides 200W maximum power dissipation compared to the APT4F120K's 225W, with gate charge of 39nC and input capacitance of 1050pF. The IXTP3N120 provides identical 200W power dissipation with gate charge of 42nC and input capacitance of 1350pF, more closely matching the APT4F120K's input capacitance specification.

STP3NK90Z Selection:

The STMicroelectronics STP3NK90Z SuperMESH™ device operates at 900V Vdss, representing a reduced voltage class unsuitable for direct substitution in applications requiring the full 1200V rating. This part is applicable only in circuits where maximum voltage stress does not exceed 900V. The device provides 3A continuous drain current and 90W maximum power dissipation. The significantly lower gate charge (22.7nC) and input capacitance (590pF) indicate faster switching characteristics compared to the APT4F120K.

Compliance and Availability:

All three substitute parts are Active products with REACH Unaffected status and EAR99 classification, matching the APT4F120K's regulatory profile. The IXYS devices provide superior long-term availability through active product status and ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can the IXFP3N120 or IXTP3N120 directly replace the APT4F120K in all applications?

A: Direct replacement is possible in applications where the continuous drain current requirement does not exceed 3A. Both IXYS devices maintain the 1200V Vdss specification and TO-220-3 package compatibility. Applications requiring the full 4A continuous drain current of the APT4F120K require circuit redesign or parallel device configuration.

Q: What is the primary difference between IXFP3N120 and IXTP3N120?

A: Both devices share identical electrical specifications at 1200V, 3A, and 200W power dissipation. The IXTP3N120 provides input capacitance of 1350pF, more closely matching the APT4F120K's 1385pF specification. The IXFP3N120 provides lower input capacitance at 1050pF. Gate charge specifications differ slightly (39nC versus 42nC), with IXTP3N120 more closely matching the APT4F120K's 43nC specification.

Q: Is the STP3NK90Z suitable for replacement in 1200V applications?

A: The STP3NK90Z operates at 900V maximum Vdss and is not suitable for applications requiring the full 1200V rating of the APT4F120K. This device is applicable only in circuits where maximum voltage stress does not exceed 900V. Use of this device in 1200V applications results in device failure.

Q: What are the thermal considerations when substituting these devices?

A: The APT4F120K provides 225W maximum power dissipation, while both IXYS alternatives provide 200W. The STP3NK90Z provides 90W. Thermal management design based on the APT4F120K's 225W specification remains valid for IXYS substitutes with 200W rating. Applications designed for the full 225W dissipation require thermal redesign when using 200W-rated devices. The STP3NK90Z's 90W rating requires significant thermal redesign.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts utilize the TO-220-3 Through Hole package, providing mechanical compatibility with the APT4F120K. Printed circuit board layouts and heatsink mounting configurations require no modification for package compatibility.

Q: What is the significance of the gate voltage (Vgs) maximum rating difference?

A: The APT4F120K and STP3NK90Z support ±30V maximum gate voltage, while both IXYS devices support ±20V. Gate drive circuits designed for ±30V operation require modification when using IXYS substitutes to ensure gate voltage does not exceed ±20V during operation.

Q: How do the gate charge specifications affect circuit performance?

A: The APT4F120K specifies 43nC gate charge at 10V. The IXTP3N120 provides 42nC, closely matching this specification. The IXFP3N120 provides 39nC, representing approximately 9% reduction. The STP3NK90Z provides 22.7nC, representing approximately 47% reduction. Lower gate charge enables faster switching transitions and reduced gate drive power requirements.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain REACH Unaffected status and EAR99 classification, matching the APT4F120K's regulatory profile. The IXYS devices provide additional ROHS3 compliance certification, supporting environmental compliance requirements in regulated markets.