FDA75N28 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDA75N28 is an N-Channel MOSFET manufactured by onsemi, rated for 280V drain-to-source voltage with 75A continuous drain current at 25°C. This device is packaged in a TO-3PN through-hole configuration and is part of the UniFET™ series. The FDA75N28 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

Substiute Parts

FDA75N28

onsemiIn Stock: 1533FDA75N28 Datasheet

Current PartRFQ

IXFQ94N30P3

IXYSIn Stock: 1111IXFQ94N30P3 Datasheet

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IXFR90N30

IXYSIn Stock: 1371IXFR90N30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDA75N28 are selected based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) must equal or exceed 280V
• Continuous Drain Current (Id) must equal or exceed 75A at 25°C
• On-State Resistance (Rds On) must support equivalent or superior switching performance
• Gate Threshold Voltage (Vgs(th)) must remain within acceptable control ranges
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

• Mounting type must be through-hole
• Package must be compatible with TO-3P or equivalent footprints
• Thermal dissipation capability must support the application requirements

The two substitute parts identified—IXFQ94N30P3 and IXFR90N30—both exceed the minimum voltage and current specifications of the FDA75N28. However, they differ in packaging configuration and thermal characteristics, requiring application-specific evaluation.

Parameter Comparison

Engineering Selection Recommendations

IXFQ94N30P3 Selection Criteria:

The IXFQ94N30P3 is an active product manufactured by IXYS and is ROHS3 compliant. This device maintains the same TO-3P-3 package footprint as the FDA75N28, enabling direct mechanical compatibility in existing PCB layouts. The IXFQ94N30P3 provides superior electrical performance with 300V Vdss rating, 94A continuous drain current, and reduced on-state resistance of 36 mOhm. Power dissipation capability is doubled at 1040W, providing thermal margin for demanding applications. Gate charge is reduced to 102 nC, improving switching speed characteristics. This substitute is suitable for applications requiring enhanced current handling and thermal performance within the same package envelope.

IXFR90N30 Selection Criteria:

The IXFR90N30 is an active product manufactured by IXYS and is ROHS3 compliant. This device uses the ISOPLUS247™ package (TO-247-3), which differs from the FDA75N28 TO-3P footprint. The IXFR90N30 matches the FDA75N28 continuous drain current specification at 75A while providing 300V Vdss rating and superior on-state resistance of 33 mOhm. Power dissipation is rated at 417W, slightly below the FDA75N28 specification. Gate charge is elevated at 360 nC due to the larger package format. This substitute is applicable when PCB layout can accommodate the TO-247-3 package and when thermal dissipation requirements are within the 417W specification.

Compliance and Status:

Both substitute parts are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The FDA75N28 obsolete status necessitates transition to one of these active alternatives for new designs or ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can the IXFQ94N30P3 be used as a direct replacement for the FDA75N28 in existing designs?

A: The IXFQ94N30P3 maintains the same TO-3P-3 package footprint and through-hole mounting configuration as the FDA75N28, enabling direct mechanical substitution on existing PCBs. Electrical specifications are superior across all critical parameters: 300V Vdss (vs. 280V), 94A Id (vs. 75A), and 36 mOhm Rds On (vs. 41 mOhm). Gate threshold voltage remains compatible at 5V. No circuit modifications are required for this substitution.

Q: What is the primary difference between the IXFQ94N30P3 and IXFR90N30 substitutes?

A: The IXFQ94N30P3 uses the TO-3P package matching the FDA75N28 footprint, while the IXFR90N30 uses the TO-247-3 package. The IXFQ94N30P3 provides higher continuous drain current (94A vs. 75A) and greater power dissipation (1040W vs. 417W). The IXFR90N30 offers lower on-state resistance (33 mOhm vs. 36 mOhm) but requires PCB layout modification to accommodate the different package format.

Q: Are both substitute parts suitable for the same thermal environment as the FDA75N28?

A: The IXFQ94N30P3 exceeds the FDA75N28 thermal capability at 1040W versus 520W, providing enhanced thermal margin. The IXFR90N30 operates at 417W, which is below the FDA75N28 specification. Thermal suitability depends on application power dissipation requirements. Applications dissipating less than 417W support either substitute. Applications requiring 417W to 520W dissipation require the IXFQ94N30P3. Applications exceeding 520W dissipation require the IXFQ94N30P3 or alternative solutions.

Q: Do the substitute parts maintain the same gate drive voltage requirements?

A: Both substitute parts specify 10V drive voltage for maximum on-state resistance, matching the FDA75N28 specification. Gate threshold voltages are compatible: IXFQ94N30P3 at 5V and IXFR90N30 at 4.5V, both within acceptable control ranges for the FDA75N28 application. Existing gate drive circuits require no modification.

Q: What is the impact of different gate charge specifications on circuit performance?

A: The FDA75N28 specifies 144 nC gate charge at 10V. The IXFQ94N30P3 reduces this to 102 nC, improving switching speed and reducing gate drive power dissipation. The IXFR90N30 increases gate charge to 360 nC due to the larger package, requiring higher gate drive current and extending switching transitions. Gate drive circuit capability must accommodate the selected substitute's gate charge specification.

Q: Are both substitute parts available in the same packaging format?

A: No. The IXFQ94N30P3 is packaged in TO-3P-3 (matching FDA75N28), supplied in tube packaging. The IXFR90N30 is packaged in TO-247-3 (ISOPLUS247™), requiring different PCB footprint and mounting hardware. Package selection depends on existing PCB design constraints and thermal management requirements.

Q: What compliance certifications apply to the substitute parts?

A: Both IXFQ94N30P3 and IXFR90N30 are ROHS3 compliant and REACH unaffected. Both carry ECCN EAR99 classification and HTSUS code 8541.29.0095, matching the FDA75N28 regulatory profile. Moisture sensitivity level is 1 (unlimited) for all three devices.