FDP26N40 Equivalent & Substitute Parts

Part Overview

The FDP26N40 is an N-Channel MOSFET manufactured by onsemi, rated for 400V drain-to-source voltage with 26A continuous drain current at 25°C. This device is packaged in a Through Hole TO-220-3 configuration and is part of the UniFET™ series. The FDP26N40 is classified as Obsolete, indicating it is no longer in active production. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for applications requiring this performance class.

Substiute Parts

FDP26N40

onsemiIn Stock: 30743FDP26N40 Datasheet

Current PartRFQ

FCP165N65S3

onsemiIn Stock: 962FCP165N65S3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDP26N40 is determined by electrical and mechanical compatibility within the N-Channel MOSFET category. The primary substitution criteria are:

Electrical Parameters:

• Drain-to-Source Voltage (Vdss) must equal or exceed 400V
• Continuous Drain Current (Id) must equal or exceed 26A at 25°C
• On-State Resistance (Rds On) must not exceed the specified maximum to maintain thermal performance
• Gate Threshold Voltage (Vgs(th)) must be compatible with existing gate drive circuits
• Operating Temperature Range must encompass -55°C to 150°C

Mechanical Parameters:

• Package Type must be TO-220-3 Through Hole configuration
• Mounting Type must be Through Hole

The FCP165N65S3 is identified as a substitute part. While this device operates at a higher voltage rating (650V Vdss) and lower continuous current (19A), it maintains compatibility with the TO-220-3 package and operates within the required temperature range. The higher voltage rating provides design margin for applications where the 400V specification is a minimum requirement.

Parameter Comparison

Engineering Selection Recommendations

FDP26N40 Status: Obsolete. This part is no longer manufactured and is not recommended for new designs.

FCP165N65S3 Status: Not For New Designs. This substitute part is also not recommended for new design implementations.

Both the main part and the identified substitute are subject to product lifecycle discontinuation. For applications currently using the FDP26N40, the FCP165N65S3 provides electrical and mechanical compatibility within the constraints of its lower current rating (19A versus 26A) and higher voltage rating (650V versus 400V).

Compliance Considerations:

• Both parts are ROHS3 Compliant
• Both parts are REACH Unaffected
• Both parts share identical operating temperature ranges (-55°C to 150°C)
• Both parts are packaged in TO-220-3 Through Hole configuration

Selection between these parts must account for application-specific current requirements. The FCP165N65S3 is suitable for applications where the 19A continuous drain current is sufficient and where the higher voltage rating does not introduce design complications.

Frequently Asked Questions (FAQ)

Q: Can the FCP165N65S3 directly replace the FDP26N40 in all applications?

A: Direct replacement is limited by current rating. The FCP165N65S3 is rated for 19A continuous drain current, while the FDP26N40 is rated for 26A. Applications requiring the full 26A capability cannot use the FCP165N65S3 as a direct substitute. Applications operating below 19A continuous current can use the FCP165N65S3.

Q: What is the significance of the higher voltage rating on the FCP165N65S3?

A: The FCP165N65S3 operates at 650V Vdss compared to the FDP26N40 at 400V Vdss. This higher voltage rating provides additional design margin in applications where transient overvoltage conditions may occur. The higher voltage rating does not negatively impact applications designed for 400V operation.

Q: Are the gate drive requirements identical between these parts?

A: Both parts have a maximum gate threshold voltage (Vgs(th)) of approximately 5V and accept a maximum gate voltage of ±30V. Gate drive circuits designed for the FDP26N40 are compatible with the FCP165N65S3. The FCP165N65S3 has a lower gate charge (39 nC versus 60 nC), which may result in faster switching characteristics.

Q: Is the TO-220-3 package identical for both parts?

A: Both parts use the TO-220-3 Through Hole package configuration. Pin assignments and mechanical dimensions are identical, allowing for direct physical substitution on printed circuit boards.

Q: What are the thermal considerations when substituting these parts?

A: The FDP26N40 has a maximum power dissipation of 265W, while the FCP165N65S3 is rated for 154W. Applications designed with thermal management for the FDP26N40 may have excess thermal capacity when using the FCP165N65S3. Thermal design review is necessary if the FCP165N65S3 is operated at its maximum power dissipation rating.

Q: Are there compliance or regulatory differences between these parts?

A: Both parts are ROHS3 Compliant and REACH Unaffected. No compliance or regulatory differences exist between the FDP26N40 and FCP165N65S3.

Q: Why are both parts classified as Obsolete or Not For New Designs?

A: Both parts have reached end-of-life status in onsemi's product portfolio. The FDP26N40 is Obsolete, and the FCP165N65S3 is Not For New Designs. For new design implementations, consultation with onsemi technical resources is necessary to identify current-generation alternatives that meet the required electrical and mechanical specifications.