FDA20N50F Equivalent & Substitute Parts

Part Overview

The FDA20N50F is an N-Channel MOSFET manufactured by onsemi, rated for 500V drain-to-source voltage with 22A continuous drain current in a TO-3PN through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design alternatives. The part belongs to the FRFET® and UniFET™ series and is ROHS3 compliant.

Substiute Parts

FDA20N50F

onsemiIn Stock: 32611FDA20N50F Datasheet

Current PartRFQ

NTHL190N65S3HF

onsemiIn Stock: 1170NTHL190N65S3HF Datasheet

MFR RecommendedRFQ

IXTQ26N50P

IXYSIn Stock: 5376IXTQ26N50P Datasheet

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IXTQ460P2

IXYSIn Stock: 22161IXTQ460P2 Datasheet

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RJK5015DPK-00#T0

Renesas Electronics CorporationIn Stock: 929RJK5015DPK-00#T0 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDA20N50F is determined by the following critical parameters:

Voltage Rating (Vdss): Substitute parts must maintain the 500V rating or exceed it to ensure safe operation in the original circuit topology.

Continuous Drain Current (Id): Substitute parts must support a minimum of 22A continuous drain current at 25°C to handle the design load requirements.

On-State Resistance (Rds On): Substitute parts should maintain comparable or lower on-state resistance to preserve power efficiency and thermal characteristics.

Gate Charge (Qg): Lower gate charge values reduce switching losses and improve circuit performance.

Package Compatibility: The original TO-3PN package can be substituted with equivalent through-hole packages (TO-3P, TO-247-3) that share the same pin configuration and thermal characteristics.

Operating Temperature Range: All substitutes must support the -55°C to 150°C operating range.

Compliance Status: All substitute parts must maintain ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

IXTQ26N50P (IXYS): This part is the closest functional equivalent to the FDA20N50F. It maintains the 500V voltage rating, exceeds the 22A current requirement with 26A capability, and provides comparable gate charge characteristics. The IXTQ26N50P is active in production status, ensuring long-term availability. The TO-3P package is mechanically compatible with the original TO-3PN footprint. This part is suitable for direct replacement in existing designs.

IXTQ460P2 (IXYS): This alternative offers the same 500V rating with 24A continuous current, meeting the design requirements. The IXTQ460P2 features lower gate charge (48 nC) compared to the main part, reducing switching losses. The PolarP2™ series designation indicates advanced technology. This part is active in production and provides higher power dissipation capability (480W), making it suitable for thermally demanding applications.

RJK5015DPK-00#T0 (Renesas Electronics): This part maintains 500V voltage rating with 25A continuous current, exceeding the original specification. The on-state resistance of 240 mOhm is comparable to the main part. However, the maximum power dissipation rating of 150W is significantly lower than the original 388W, limiting its use to lower-power applications. This part is active in production and ROHS3 compliant.

NTHL190N65S3HF (onsemi): This part offers a higher voltage rating of 650V, providing additional design margin for overvoltage conditions. However, the continuous drain current of 20A falls below the original 22A specification, making it unsuitable for applications requiring the full 22A rating. The lower gate charge (34 nC) and reduced input capacitance offer switching performance advantages. This part is classified as not for new designs, limiting its applicability for new system development.

Frequently Asked Questions (FAQ)

Q: Can the FDA20N50F be directly replaced with the IXTQ26N50P?

A: Yes. Both parts share the same 500V voltage rating, comparable continuous drain current (26A vs. 22A), and compatible through-hole packages (TO-3P vs. TO-3PN). The IXTQ26N50P is active in production, ensuring availability and long-term support.

Q: What is the primary difference between the IXTQ26N50P and IXTQ460P2?

A: Both parts maintain 500V rating and are suitable substitutes. The IXTQ460P2 offers higher power dissipation (480W vs. 400W) and lower gate charge (48 nC vs. 65 nC), making it preferable for high-frequency switching applications. The IXTQ26N50P provides higher continuous current (26A vs. 24A).

Q: Why is the NTHL190N65S3HF listed as a substitute if it has lower current rating?

A: The NTHL190N65S3HF is included as a substitute option for applications where the 20A current rating is sufficient and the higher 650V voltage rating provides additional design margin. It is not suitable for designs requiring the full 22A specification.

Q: Is the RJK5015DPK-00#T0 suitable for high-power applications?

A: No. The RJK5015DPK-00#T0 has a maximum power dissipation of 150W, significantly lower than the original FDA20N50F (388W). This part is suitable only for low-power applications where thermal dissipation is not a limiting factor.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for both existing and new designs.

Q: What package considerations apply when substituting the FDA20N50F?

A: The original TO-3PN package can be substituted with TO-3P or TO-247-3 packages. All three packages are through-hole mounted and share compatible pin configurations. PCB layout modifications may be required for TO-247-3 packages due to different pin spacing.

Q: Which substitute part is recommended for new designs?

A: The IXTQ26N50P or IXTQ460P2 are recommended for new designs, as both are active in production status. The IXTQ26N50P provides the closest electrical match to the original part, while the IXTQ460P2 offers enhanced switching performance through lower gate charge.