APT42F50S N-Channel 500V 42A MOSFET Equivalent & Substitute Parts

Part Overview

The APT42F50S is an N-Channel MOSFET manufactured by Microchip Technology, rated for 500V drain-to-source voltage and 42A continuous drain current at 25°C. This device is housed in a D3PAK (TO-268AA) surface mount package and is designed for high-voltage switching applications requiring robust thermal performance up to 625W. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be achieved within the same package family while maintaining or exceeding critical specifications such as voltage rating, current capacity, and thermal characteristics. Alternative devices may be required due to inventory availability, application-specific performance optimization, or design flexibility across compatible product lines.

Substiute Parts

APT42F50S

Microchip TechnologyIn Stock: 698APT42F50S Datasheet

Current PartRFQ

IXFT50N50P3

IXYSIn Stock: 1012IXFT50N50P3 Datasheet

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IXFT60N50P3

IXYSIn Stock: 1359IXFT60N50P3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the APT42F50S are qualified based on the following criteria:

Mandatory Matching Parameters:

• Drain-to-Source Voltage (Vdss): 500V minimum
• Package Type: TO-268AA (D3PAK) surface mount configuration
• FET Type: N-Channel MOSFET
• Operating Temperature Range: -55°C to 150°C minimum
• RoHS3 Compliance and REACH Unaffected status

Performance Compatibility Parameters:

• Continuous Drain Current (Id): Equal to or greater than 42A
• On-State Resistance (Rds On): Equal to or lower than 130mOhm (lower values indicate improved performance)
• Gate Threshold Voltage (Vgs(th)): Within ±30V maximum gate voltage specification
• Power Dissipation: Equal to or greater than 625W

The identified substitute parts IXFT50N50P3 and IXFT60N50P3 from IXYS meet all mandatory parameters and provide enhanced current and thermal performance characteristics compared to the APT42F50S baseline specification.

Parameter Comparison

Engineering Selection Recommendations

APT42F50S Selection Criteria: The APT42F50S remains the primary choice for applications requiring the exact specified performance envelope of 42A continuous drain current and 625W power dissipation. This device is actively produced by Microchip Technology with full RoHS3 compliance and REACH unaffected status, ensuring long-term supply chain stability and regulatory compliance for industrial and commercial applications.

IXFT50N50P3 Selection Criteria: The IXFT50N50P3 provides a direct performance upgrade with 50A continuous drain current and 960W power dissipation while maintaining identical 500V voltage rating and TO-268AA package compatibility. This substitute is suitable for applications where increased current capacity and thermal headroom are beneficial without requiring design modification. The device exhibits lower on-state resistance (120mOhm versus 130mOhm) and reduced gate charge (85nC versus 170nC), resulting in improved switching efficiency. Full RoHS3 compliance and REACH unaffected status are maintained.

IXFT60N50P3 Selection Criteria: The IXFT60N50P3 represents the highest performance option within the substitute group, offering 60A continuous drain current and 1040W power dissipation. This device is appropriate for applications requiring maximum thermal performance and current capacity margin while operating within the same 500V voltage specification and TO-268AA package footprint. The on-state resistance of 100mOhm provides the lowest conduction losses among the three options. RoHS3 compliance and REACH unaffected status are confirmed.

All three devices maintain identical operating temperature range (-55°C to 150°C), gate voltage specification (±30V maximum), and regulatory compliance status, ensuring seamless integration into existing design frameworks.

Frequently Asked Questions (FAQ)

Q: Can the IXFT50N50P3 or IXFT60N50P3 be used as direct replacements for the APT42F50S in existing designs?

A: Yes. Both substitute parts are compatible with the APT42F50S in TO-268AA package footprint and PCB layout. All three devices share identical 500V drain-to-source voltage rating, operating temperature range (-55°C to 150°C), and gate voltage specification (±30V maximum). The substitute parts provide equal or superior electrical performance across all critical parameters including on-state resistance, gate charge, and power dissipation capability.

Q: What are the key differences in on-state resistance between these devices?

A: The APT42F50S exhibits 130mOhm on-state resistance at 21A and 10V gate voltage. The IXFT50N50P3 provides 120mOhm at 25A and 10V, while the IXFT60N50P3 delivers 100mOhm at 30A and 10V. Lower on-state resistance reduces conduction losses and heat generation during switching operation. Selection depends on application current requirements and thermal management strategy.

Q: How do gate charge specifications affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The APT42F50S requires 170nC at 10V gate voltage, while the IXFT50N50P3 requires only 85nC at 0V and the IXFT60N50P3 requires 96nC at 10V. Lower gate charge reduces driver circuit stress and enables faster switching transitions, improving overall system efficiency in high-frequency applications.

Q: Are all three devices RoHS3 compliant and REACH unaffected?

A: Yes. The APT42F50S, IXFT50N50P3, and IXFT60N50P3 are all RoHS3 compliant and REACH unaffected. All devices carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

Q: What is the significance of input capacitance (Ciss) differences?

A: Input capacitance affects gate drive circuit design and switching speed. The APT42F50S has 6810pF input capacitance at 25V, the IXFT50N50P3 has 4335pF, and the IXFT60N50P3 has 6250pF. Lower input capacitance reduces gate drive power requirements and enables faster switching transitions. Selection depends on gate driver capability and application switching frequency requirements.

Q: Can these devices be used interchangeably in thermal management designs?

A: The devices have different maximum power dissipation ratings: APT42F50S at 625W, IXFT50N50P3 at 960W, and IXFT60N50P3 at 1040W. While all three operate within the same temperature range (-55°C to 150°C), applications with higher power dissipation requirements benefit from the increased thermal capacity of the IXFT50N50P3 or IXFT60N50P3. Thermal design calculations must account for the specific device's power dissipation capability and junction temperature limits.

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

A: All three devices use identical TO-268-3 (D³Pak) surface mount package configuration with 2 leads plus tab. Pinout and PCB footprint are fully compatible across all three parts, enabling direct substitution without layout modification.