FQP6N40C Equivalent & Substitute Parts

Part Overview

The FQP6N40C is an N-Channel MOSFET manufactured by onsemi, rated for 400V drain-to-source voltage with 6A continuous drain current at 25°C. This device is packaged in a Through Hole TO-220-3 configuration and is part of the QFET® series. The FQP6N40C is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	400	V
Current - Continuous Drain (Id) @ 25°C	6	A
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	1	Ohm @ 3A, 10V
Power Dissipation (Max)	73	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the FQP6N40C is determined by the following critical parameters:

Electrical Compatibility Requirements:

FET Type: N-Channel (must match)
Drain to Source Voltage (Vdss): Minimum 400V (equal or higher acceptable)
Current - Continuous Drain (Id) @ 25°C: Minimum 6A (equal or higher acceptable)
Operating Temperature Range: -55°C to 150°C (must encompass or match)
Gate Drive Voltage: 10V (standard for logic-level or standard gate drive)

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (must match)
Package / Case: TO-220-3 or compatible TO-220 variant (must match)

Compliance Requirements:

RoHS3 Compliant (required)
REACH Unaffected (required)

The substitute parts identified below meet these criteria with variations in drain current rating, power dissipation, and voltage rating that allow for direct functional replacement in applications designed for the FQP6N40C.

Parameter Comparison

Parameter	FQP6N40C	FCP600N65S3R0	STP11NK40Z	STP7NK40Z
Manufacturer	onsemi	onsemi	STMicroelectronics	STMicroelectronics
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	400 V	650 V	400 V	400 V
Current - Continuous Drain (Id) @ 25°C	6 A	6 A	9 A	5.4 A
Drive Voltage (Max Rds On)	10 V	10 V	10 V	10 V
Rds On (Max) @ Id, Vgs	1 Ohm @ 3A, 10V	600 mOhm @ 3A, 10V	550 mOhm @ 4.5A, 10V	1 Ohm @ 2.7A, 10V
Power Dissipation (Max)	73 W	54 W	110 W	70 W
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Active	Active

Engineering Selection Recommendations

FCP600N65S3R0 (onsemi SuperFET® III)

This part is classified as "Not For New Designs" and carries a higher Vdss rating of 650V compared to the FQP6N40C's 400V. While it maintains the same 6A continuous drain current and TO-220-3 package, the elevated voltage rating and reduced power dissipation (54W vs. 73W) make it suitable for applications where higher voltage margin is beneficial. However, the "Not For New Designs" status limits its use to legacy system support.

STP11NK40Z (STMicroelectronics SuperMESH™)

This part is classified as "Active" and provides a direct voltage match at 400V with an enhanced current rating of 9A. The increased power dissipation capability (110W vs. 73W) and improved on-resistance characteristics (550 mOhm at 4.5A) make this the preferred substitute for new designs. The TO-220-3 package and full compliance certifications ensure mechanical and electrical compatibility.

STP7NK40Z (STMicroelectronics SuperMESH™)

This part is classified as "Active" and maintains the 400V voltage rating with a slightly reduced current rating of 5.4A. The power dissipation (70W) and on-resistance (1 Ohm at 2.7A) are comparable to the FQP6N40C. This substitute is suitable for applications where the 5.4A rating is sufficient and represents a conservative replacement option.

Frequently Asked Questions (FAQ)

Q: Can the FCP600N65S3R0 be used as a direct replacement for the FQP6N40C?

A: The FCP600N65S3R0 is electrically compatible in terms of package, gate drive voltage, and current rating. However, its higher Vdss rating (650V vs. 400V) and "Not For New Designs" status make it suitable only for legacy applications requiring component continuity. For new designs, the STP11NK40Z is the recommended choice.

Q: What is the primary advantage of the STP11NK40Z over the FQP6N40C?

A: The STP11NK40Z offers an increased continuous drain current rating of 9A compared to 6A, higher power dissipation capability (110W vs. 73W), and improved on-resistance characteristics. It maintains the same 400V voltage rating and TO-220-3 package. Additionally, its "Active" product status ensures long-term availability and support.

Q: Is the STP7NK40Z suitable for all applications using the FQP6N40C?

A: The STP7NK40Z is suitable for applications where the 5.4A continuous drain current rating is adequate. It provides comparable on-resistance and power dissipation to the FQP6N40C while maintaining the same 400V voltage rating and TO-220-3 package. Applications requiring the full 6A rating should use the STP11NK40Z.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed (FCP600N65S3R0, STP11NK40Z, and STP7NK40Z) are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the FQP6N40C.

Q: Can these parts be used interchangeably on the same PCB layout?

A: Yes, all substitute parts use the TO-220-3 package and Through Hole mounting type, allowing direct PCB layout compatibility with the FQP6N40C. No layout modifications are required for mechanical fit.

Q: What is the difference between the onsemi and STMicroelectronics substitutes?

A: The onsemi FCP600N65S3R0 is from the SuperFET® III series with a higher voltage rating (650V) but "Not For New Designs" status. The STMicroelectronics parts (STP11NK40Z and STP7NK40Z) are from the SuperMESH™ series with "Active" status, providing better long-term availability and support for new designs.

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