FQAF33N10 Equivalent & Substitute Parts

Part Overview

The FQAF33N10 is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 25.8A continuous drain current at 25°C. This device is packaged in a TO-3PF through-hole configuration and is part of the QFET® series. The FQAF33N10 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating potential package differences.

Substiute Parts

FQAF33N10

onsemiIn Stock: 2033FQAF33N10 Datasheet

Current PartRFQ

IRFP140NPBF

Infineon TechnologiesIn Stock: 15730IRFP140NPBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FQAF33N10 are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain to Source Voltage (Vdss): Must equal or exceed 100V
• Continuous Drain Current (Id): Must equal or exceed 25.8A at 25°C
• Gate Threshold Voltage (Vgs(th)): Must be compatible at 4V @ 250µA
• Rds On characteristics: Must support equivalent on-state resistance performance
• Operating Temperature Range: Must span -55°C to 175°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole configuration required
• Package compatibility: Devices in alternative through-hole packages (TO-247AC, TO-3P variants) are acceptable provided electrical parameters are met

The IRFP140NPBF meets these substitution criteria through equivalent voltage rating, superior current capacity, compatible threshold voltage, and matching operating temperature range, despite packaging in TO-247AC rather than TO-3PF.

Parameter Comparison

Engineering Selection Recommendations

The IRFP140NPBF is a qualified substitute for the FQAF33N10 based on the following engineering factors:

Electrical Equivalence: The IRFP140NPBF maintains identical Vdss (100V) and Vgs(th) (4V @ 250µA) specifications. The continuous drain current rating of 33A exceeds the FQAF33N10 requirement of 25.8A, providing operational margin. On-state resistance (Rds On) is equivalent at 52mOhm, ensuring comparable conduction losses. The operating temperature range (-55°C to 175°C) is identical.

Product Status and Availability: The FQAF33N10 is classified as obsolete, while the IRFP140NPBF maintains active product status with 15,700 units in stock, ensuring long-term availability and supply chain continuity.

Compliance and Certifications: Both devices are REACH Unaffected and classified under ECCN EAR99. The IRFP140NPBF carries RoHS3 compliance certification, meeting current regulatory requirements.

Package Consideration: The IRFP140NPBF is packaged in TO-247AC rather than TO-3PF. Both are through-hole configurations with different mechanical footprints. PCB layout and thermal management design modifications are required to accommodate the package change.

Frequently Asked Questions (FAQ)

Q: Can the IRFP140NPBF directly replace the FQAF33N10 without circuit modifications?

A: Electrical substitution is valid. The IRFP140NPBF meets all critical electrical parameters. However, the package change from TO-3PF to TO-247AC requires PCB layout modifications, including different mounting hole patterns and lead configurations. Thermal management design must be re-evaluated for the new package geometry.

Q: What is the significance of the higher gate charge (94 nC vs. 51 nC) in the IRFP140NPBF?

A: Gate charge directly affects gate drive circuit requirements. The IRFP140NPBF requires approximately 84% more gate charge than the FQAF33N10. Gate driver circuits must supply sufficient current to charge the gate within acceptable switching time windows. Existing gate drive circuits may require adjustment or replacement.

Q: Why does the IRFP140NPBF have higher power dissipation rating (140W vs. 83W)?

A: Power dissipation rating reflects the device's thermal capability under specified conditions. The higher rating in the IRFP140NPBF indicates superior thermal performance, typically due to improved die design and package thermal characteristics. This provides additional thermal margin in applications operating near the FQAF33N10 limits.

Q: Are there any restrictions on using the IRFP140NPBF in existing FQAF33N10 applications?

A: The IRFP140NPBF is electrically compatible for applications within the FQAF33N10 electrical envelope. Physical package differences require PCB redesign. Gate drive circuit adjustments may be necessary due to increased gate charge. Thermal management design must account for the TO-247AC package thermal characteristics.

Q: What is the difference between TO-3PF and TO-247AC packages?

A: TO-3PF is a three-lead through-hole package with a specific mounting configuration. TO-247AC is a three-lead through-hole package with different lead spacing and mounting geometry. Both are through-hole devices, but mechanical compatibility requires PCB layout changes. Thermal interface design differs between packages.

Q: Is the IRFP140NPBF suitable for high-frequency switching applications?

A: The IRFP140NPBF exhibits higher gate charge (94 nC) compared to the FQAF33N10 (51 nC), which affects switching speed. In high-frequency applications, the increased gate charge may result in longer switching times and higher switching losses. Application-specific analysis is required to determine suitability for frequency-dependent designs.