FDA33N25 Equivalent & Substitute Parts

Part Overview

The FDA33N25 is an N-Channel MOSFET manufactured by onsemi, rated for 250V drain-to-source voltage with 33A continuous drain current at 25°C. This device features the UniFET™ series technology and is housed in a TO-3PN package for through-hole mounting applications. The FDA33N25 is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating package and mounting requirements.

Substiute Parts

FDA33N25

onsemiIn Stock: 5330FDA33N25 Datasheet

Current PartRFQ

NTHL099N60S5

onsemiIn Stock: 1443NTHL099N60S5 Datasheet

MFR RecommendedRFQ

IXTQ42N25P

IXYSIn Stock: 1349IXTQ42N25P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDA33N25 are identified based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: Substitute devices must support the 250V Vdss specification or higher. Devices rated above 250V (such as 600V) are acceptable as they provide voltage margin for the application.

Current Rating Compatibility: Substitute devices must support a minimum continuous drain current of 33A at 25°C. Devices rated at or above 33A meet this requirement.

On-State Resistance: Rds On characteristics must be comparable to enable equivalent power dissipation and thermal performance in the application circuit.

Package and Mounting: Substitute devices must be through-hole mounted components. Package types TO-3P, TO-3PN, and TO-247-3 are mechanically compatible with standard through-hole PCB layouts.

Operating Temperature Range: Substitute devices must support the full -55°C to 150°C operating temperature range.

Gate Drive Voltage: Substitute devices must operate with standard 10V gate drive voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

NTHL099N60S5 (onsemi SuperFET® V Series)

The NTHL099N60S5 is a manufacturer-recommended substitute from onsemi. This device maintains the same 33A continuous drain current rating and supports the full -55°C to 150°C operating temperature range. The 600V Vdss rating provides voltage margin above the 250V requirement. On-state resistance of 99 mOhm is comparable to the FDA33N25 at 94 mOhm. Gate charge of 48 nC is nearly identical to the original part at 46.8 nC. The device is housed in a TO-247-3 through-hole package, which requires PCB layout modification from the original TO-3PN footprint. The NTHL099N60S5 carries ROHS3 compliance and is classified as Not For New Designs, indicating limited long-term availability.

IXTQ42N25P (IXYS Polar Series)

The IXTQ42N25P is a similar substitute from IXYS, maintaining the exact 250V Vdss rating as the FDA33N25. This device provides enhanced current capability at 42A continuous drain current, exceeding the 33A requirement. On-state resistance of 84 mOhm is superior to the original part. Power dissipation capability is increased to 300W compared to 245W in the FDA33N25. The device operates across the full -55°C to 150°C temperature range and is housed in a TO-3P through-hole package, compatible with the original TO-3PN footprint. The IXTQ42N25P is classified as Active, providing superior long-term availability and design continuity. ROHS3 compliance is maintained.

Both substitute parts satisfy the electrical and thermal requirements of the FDA33N25 application. Selection between NTHL099N60S5 and IXTQ42N25P depends on package compatibility with existing PCB layouts and long-term component availability requirements.

Frequently Asked Questions (FAQ)

Q: Can the NTHL099N60S5 be used as a direct replacement for the FDA33N25?

A: The NTHL099N60S5 is electrically compatible with the FDA33N25 across all critical parameters including voltage, current, and temperature ratings. However, the TO-247-3 package differs from the original TO-3PN package, requiring PCB layout modification for mounting and thermal management.

Q: What is the primary advantage of the IXTQ42N25P over the FDA33N25?

A: The IXTQ42N25P provides 42A continuous drain current compared to 33A in the FDA33N25, along with lower on-state resistance (84 mOhm versus 94 mOhm) and higher power dissipation capability (300W versus 245W). The TO-3P package is mechanically compatible with the original TO-3PN footprint.

Q: Why does the NTHL099N60S5 have a higher Vdss rating than the FDA33N25?

A: The NTHL099N60S5 is rated for 600V Vdss, which exceeds the 250V requirement of the FDA33N25. This higher voltage rating does not prevent substitution; it provides additional voltage margin for the application circuit.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the NTHL099N60S5 and IXTQ42N25P are ROHS3 compliant, matching the compliance status of the FDA33N25.

Q: What is the difference in gate charge between the substitute parts and the original?

A: The FDA33N25 has a gate charge of 46.8 nC at 10V. The NTHL099N60S5 is nearly identical at 48 nC. The IXTQ42N25P has a higher gate charge of 70 nC, which may require adjustment to gate drive circuit timing in high-frequency switching applications.

Q: Can the IXTQ42N25P be used in applications requiring the exact TO-3PN package?

A: The IXTQ42N25P uses a TO-3P package, which is mechanically compatible with TO-3PN footprints in standard through-hole PCB designs. Verification of specific mounting requirements with your PCB layout is necessary.

Q: What is the product status of each substitute part?

A: The NTHL099N60S5 is classified as Not For New Designs, indicating limited future availability. The IXTQ42N25P is classified as Active, providing superior long-term procurement and design continuity for new applications.