2SK3707 Equivalent & Substitute Parts

Part Overview

The 2SK3707 is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 20A continuous drain current in a Through Hole TO-220ML package. This device is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and production continuity. The 2SK3707 is suitable for switching applications requiring moderate voltage and current ratings with thermal management via the TO-220 form factor.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	20	A
Rds On (Max) @ 10A, 10V	60	mOhm
Gate Charge (Qg) @ 10V	44	nC
Input Capacitance (Ciss) @ 20V	2150	pF
Maximum Gate Voltage (Vgs)	±20	V
Power Dissipation (Max)	2 (Ta), 25 (Tc)	W
Operating Temperature (TJ)	150	°C
Package Type	TO-220ML	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the 2SK3707 is based on electrical and mechanical parameter alignment within the N-Channel MOSFET category. The primary substitution criteria are:

Electrical Parameters:

Drain to Source Voltage (Vdss): Must equal or exceed 100V
Continuous Drain Current (Id): Must equal or exceed 20A
Gate Voltage Rating (Vgs): Must support ±20V operation
Rds On characteristics: Must be compatible with 60mOhm maximum specification

Mechanical Parameters:

Package Type: TO-220 form factor (TO-220ML or TO-220AB acceptable)
Mounting Type: Through Hole configuration
Thermal characteristics: Must support required power dissipation levels

The IRFI540NPBF from Infineon Technologies meets these criteria as an N-Channel MOSFET with identical voltage and current ratings, compatible TO-220AB packaging, and superior thermal performance characteristics.

Parameter Comparison

Parameter	2SK3707 (onsemi)	IRFI540NPBF (Infineon)	Unit
FET Type	N-Channel	N-Channel	—
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	—
Drain to Source Voltage (Vdss)	100	100	V
Continuous Drain Current (Id) @ 25°C	20 (Ta)	20 (Tc)	A
Rds On (Max)	60 @ 10A, 10V	52 @ 11A, 10V	mOhm
Gate Charge (Qg) @ 10V	44	94	nC
Input Capacitance (Ciss)	2150 @ 20V	1400 @ 25V	pF
Maximum Gate Voltage (Vgs)	±20	±20	V
Power Dissipation (Max)	2 (Ta), 25 (Tc)	54 (Tc)	W
Operating Temperature (TJ)	150	-55 to 175	°C
Package Type	TO-220ML	TO-220AB Full-Pak	—
Mounting Type	Through Hole	Through Hole	—
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The IRFI540NPBF is a direct electrical substitute for the 2SK3707 with the following considerations:

Compliance and Availability: The IRFI540NPBF is classified as Active product status with RoHS3 compliance, ensuring long-term availability and regulatory alignment. The 2SK3707 is obsolete, making the IRFI540NPBF the appropriate selection for new designs and production continuity.

Electrical Compatibility: Both devices share identical Vdss (100V) and Id (20A) ratings. The IRFI540NPBF exhibits lower Rds On (52mOhm versus 60mOhm), resulting in reduced conduction losses. The IRFI540NPBF has higher gate charge (94nC versus 44nC) and lower input capacitance (1400pF versus 2150pF), which may affect switching speed characteristics in specific circuit topologies.

Thermal Performance: The IRFI540NPBF provides superior power dissipation capability (54W at Tc versus 25W at Tc for the 2SK3707), enabling operation in higher thermal stress environments. The extended operating temperature range (-55°C to 175°C) of the IRFI540NPBF provides greater flexibility for extreme environment applications.

Package Compatibility: Both devices utilize Through Hole TO-220 packaging. The TO-220AB Full-Pak variant of the IRFI540NPBF is mechanically compatible with TO-220ML footprints, with identical pin configuration and thermal interface requirements.

Frequently Asked Questions (FAQ)

Q: Can the IRFI540NPBF directly replace the 2SK3707 in existing PCB designs?

A: Yes. Both devices share identical pin configuration in the TO-220 package and equivalent electrical ratings for Vdss and Id. PCB footprints designed for TO-220ML accept TO-220AB components without modification. Thermal interface requirements remain consistent.

Q: What are the key electrical differences between these devices?

A: The IRFI540NPBF has lower on-resistance (52mOhm versus 60mOhm), higher gate charge (94nC versus 44nC), and lower input capacitance (1400pF versus 2150pF). These differences result in reduced conduction losses but may require gate drive circuit evaluation for switching speed optimization.

Q: Why is the IRFI540NPBF recommended over the 2SK3707?

A: The 2SK3707 is classified as obsolete, creating supply chain risk. The IRFI540NPBF is an active product with superior thermal performance (54W versus 25W), extended temperature range (-55°C to 175°C), and RoHS3 compliance, ensuring regulatory alignment and long-term availability.

Q: Are there any circuit design considerations when substituting these devices?

A: Gate drive circuits should be evaluated for the higher gate charge of the IRFI540NPBF (94nC versus 44nC). Switching frequency and thermal management may require adjustment based on the specific application. Both devices support identical gate voltage ratings (±20V).

Q: What is the moisture sensitivity level for both devices?

A: Both the 2SK3707 and IRFI540NPBF are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are both devices REACH compliant?

A: Yes. Both the 2SK3707 and IRFI540NPBF are classified as REACH Unaffected, confirming compliance with REACH regulations.

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