2SK4209 Equivalent & Substitute Parts

Part Overview

The 2SK4209 is an N-Channel MOSFET rated for 800V drain-to-source voltage with 12A continuous drain current in a through-hole TO-3PB package. Manufactured by onsemi, this device is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The obsolete status of the 2SK4209 requires engineers to evaluate functionally compatible alternatives that maintain electrical and mechanical compatibility within system specifications.

Substiute Parts

2SK4209

onsemiIn Stock: 11962SK4209 Datasheet

Current PartRFQ

FQA13N80-F109

onsemiIn Stock: 28768FQA13N80-F109 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SK4209 is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 800 V
• Continuous Drain Current (Id): Must meet or exceed 12 A at rated conditions
• Gate-Source Voltage (Vgs): Must support ±30 V maximum rating
• On-State Resistance (Rds On): Must not exceed specified maximum values at equivalent test conditions
• FET Technology: N-Channel MOSFET (Metal Oxide)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole configuration required
• Package Classification: TO-3P series compatible footprints
• Thermal Performance: Power dissipation capability must support application requirements

The FQA13N80-F109 meets these substitution criteria through equivalent voltage rating, superior current capability, compatible package footprint, and active product status enabling continued supply chain availability.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 2SK4209 is classified as obsolete, whereas the FQA13N80-F109 maintains active product status. Active status ensures continued manufacturing, documented supply chain availability, and manufacturer technical support.

Compliance and Certification: Both devices carry REACH Unaffected status and EAR99 ECCN classification. The FQA13N80-F109 additionally carries RoHS3 Compliance certification, meeting current regulatory requirements for new designs and production environments subject to RoHS directives.

Electrical Performance: The FQA13N80-F109 provides equivalent or superior electrical performance across all critical parameters. The 800 V Vdss rating matches the 2SK4209 requirement. Continuous drain current of 12.6 A exceeds the 12 A specification. On-state resistance of 750 mΩ is lower than the 2SK4209 specification of 1.08 Ω, resulting in reduced power dissipation and improved thermal performance in equivalent applications.

Thermal Performance: Maximum power dissipation of 300 W (Tc) for the FQA13N80-F109 substantially exceeds the 190 W (Tc) rating of the 2SK4209, providing enhanced thermal margin and improved reliability in thermally constrained applications.

Package and Mechanical Compatibility: Both devices utilize TO-3P series through-hole packages with identical footprints (TO-3P-3, SC-65-3), enabling direct mechanical substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the FQA13N80-F109 directly replace the 2SK4209 in existing designs?

A: Yes. Both devices share identical drain-to-source voltage (800 V), equivalent gate-source voltage ratings (±30 V), and compatible through-hole TO-3P package footprints. The FQA13N80-F109 provides equal or superior electrical performance across all critical parameters, enabling direct substitution without circuit modification.

Q: What are the key electrical differences between these devices?

A: The FQA13N80-F109 provides higher continuous drain current (12.6 A versus 12 A), lower on-state resistance (750 mΩ versus 1.08 Ω), and higher power dissipation capability (300 W versus 190 W). Gate charge is slightly higher (88 nC versus 75 nC) and input capacitance is higher (3500 pF versus 1500 pF). These differences result in improved thermal performance and reduced conduction losses in the substitute device.

Q: Are the package footprints identical?

A: Both devices use TO-3P series through-hole packages with identical case designations (TO-3P-3, SC-65-3). The 2SK4209 uses TO-3PB packaging while the FQA13N80-F109 uses TO-3PN packaging. Both variants share the same footprint and pin configuration, enabling direct PCB compatibility.

Q: What is the significance of the FQA13N80-F109 being an active product?

A: Active product status ensures ongoing manufacturing, documented technical support from the manufacturer, and reliable supply chain availability. The 2SK4209 obsolete status creates supply risk and limits access to manufacturer technical resources. Selection of the active FQA13N80-F109 mitigates long-term supply chain risk.

Q: Does the FQA13N80-F109 require different gate drive circuitry?

A: No. Both devices operate with 10 V drive voltage and support ±30 V maximum gate-source voltage. Gate threshold voltage differs slightly (5 V versus 4 V), but this difference does not require gate drive circuit modification for standard applications. Gate charge is higher in the substitute (88 nC versus 75 nC), which may require slightly longer switching times in high-frequency applications but does not prevent direct substitution.

Q: What compliance certifications apply to the FQA13N80-F109?

A: The FQA13N80-F109 carries RoHS3 Compliance certification, REACH Unaffected status, and EAR99 ECCN classification. These certifications meet current regulatory requirements for electronic components in most jurisdictions and support compliance with environmental and export control regulations.

Q: How does the higher input capacitance of the FQA13N80-F109 affect circuit performance?

A: Input capacitance of 3500 pF (FQA13N80-F109) versus 1500 pF (2SK4209) increases gate charge requirements and may extend switching transition times in high-frequency switching applications. For standard switching frequencies below 100 kHz, this difference has negligible impact on circuit performance. High-frequency applications should verify switching characteristics through detailed circuit simulation or prototype testing.

Q: Is thermal management different between these devices?

A: The FQA13N80-F109 provides substantially higher power dissipation capability (300 W versus 190 W), enabling operation with reduced thermal stress or smaller heatsinks for equivalent power levels. Lower on-state resistance (750 mΩ versus 1.08 Ω) reduces conduction losses, further improving thermal performance. Existing heatsink designs for the 2SK4209 remain suitable for the FQA13N80-F109 with improved thermal margin.