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Fairchild FQT4N20 200V N-Channel MOSFET Datasheet

Summary

A 200V N-channel enhancement mode power MOSFET rated at 0.85A continuous drain current with 1.4 ohm on-state resistance at 10V gate drive. Features low gate charge of 5.0nC typical, low Crss of 5.0pF, fast switching speed, and improved dv/dt capability. Packaged in SOT-223 surface-mount format. Designed using Fairchild proprietary planar stripe DMOS technology for high efficiency applications. Targeted at power electronics engineers for use in DC/DC converters, switch mode power supplies, DC-AC inverters for UPS systems, and motor control circuits.

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FQ T4N 20QFET

May 2001

FQT4N20 200V N-Channel MOSFET General Description Features These N-Channel enhancement mode power field effect 0.85A, 200V, RDS(on) = 1.4Ω @VGS = 10 V transistors are produced using Fairchild’s proprietary, Low gate charge ( typical 5.0 n C) planar stripe, DMOS technology. Low Crss ( typical 5.0 p F) This advanced technology has been especially tailored to Fast switching minimize on-state resistance, provide superior switching Improved dv/dt capability performance, and withstand high energy pulse in the avalanche and commutation mode. These devices are well suited for high efficiency switching DC/DC converters, switch mode power supply, DC-AC converters for uninterrupted power supply, motor control.

SOT-223 FQT Series

Absolute Maximum Ratings TC = 25°C unless otherwise noted Symbol Parameter FQT4N20 Units VDSS Drain-Source Voltage ID Drain Current - Continuous (TC = 25°C) 0.85

- Continuous (TC = 70°C) 0.68

IDM Drain Current - Pulsed (Note 1) 3.4 VGSS Gate-Source Voltage ± 30 EAS Single Pulsed Avalanche Energy (Note 2) m J IAR Avalanche Current (Note 1) 0.85 EAR Repetitive Avalanche Energy (Note 1) 0.22 m J

dv/dt Peak Diode Recovery dv/dt (Note 3) 5.5 V/ns

PD Power Dissipation (TC = 25°C) 2.2

- Derate above 25°C 0.018 W/°C

TJ, TSTG Operating and Storage Temperature Range -55 to +150 °C

Maximum lead temperature for soldering purposes,

TL °C

1/8" from case for 5 seconds

Thermal Characteristics Symbol Parameter Typ Max Units RθJA Thermal Resistance, Junction-to-Ambient * °C/W * When mounted on the minimum pad size recommended (PCB Mount)

Rev. A, May 2001©2001 Fairchild Semiconductor Corporation

Page Summary Contents For Fairchild FQT4N20 200V N-Channel MOSFET Datasheet

Page 1 FQ T4N 20QFET May 2001 FQT4N20 200V N-Channel MOSFET General Description Features These N-Channel enhancement mode power field effect 0.85A, 200V, RDS(on) = 1.4Ω @VGS = 10 V transistors are produced u...
Page 2 FQ T4N Electrical Characteristics TC = 25°C unless otherwise noted Symbol Parameter Test Conditions Min Typ Max Units Off Characteristics BVDSS Drain-Source Breakdown Voltage VGS = 0 V, ID = 250 µA ∆B...
Page 3 FQ T4N Typical Characteristics DS (o n) Ca pa cit an ce s [ p F , D ra in Cu rre nt [A Dr ain -S ou rc On -R es ist an ce VGS Top : 15 V 10 V 8.0 V 7.0 V 6.5 V 6.0 V Bottom : 5.5 V ※ Notes : ※ Notes :...
Page 4 FQ T4N Typical Characteristics (Continued) BV DS , (N orm ali ze d) D, ra in Cu rre nt [A Dr ain -S ou rce rea kd ow n V olt ag rm l R sp se 0.9 ※ Notes : 1. VGS = 0 V ※ Notes : 2. ID = 250 μA 0.5 1. ...
Page 5 FQ T4N Gate Charge Test Circuit & Waveform Same Type 50KΩ Qg as DUT Qgs Qgd Charge Resistive Switching Test Circuit & Waveforms VDS 90% VDD RG ( 0.5 rated VDS ) 10% DUT Vin td(on) tr td(off) o...
Page 6 FQ T4N Peak Diode Recovery dv/dt Test Circuit & Waveforms Driver RG Same Type as DUT VDD dv/dt controlled by RG IS controlled by pulse period Gate Pulse Width VGS D = Gate Pulse Period 10V ( Drive...
Page 7 FQ T4N Package Dimensions SOT-223 MAX1.80 2.30 TYP Rev. A, May 2001©2001 Fairchild Semiconductor Corporation
Page 8 TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx™ FAST...

Manual Details

Brand Fairchild
Pages 8
File Size 644.23 KB
Published June 17, 2026
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Frequently Asked Questions

What is the maximum continuous drain current at 25°C?

0.85A.

What is the typical gate charge of the FQT4N20?

5.0 nC.

Can this MOSFET be used in life support devices?

No, it is not authorized for use in life support devices without written approval.

What is the drain-source breakdown voltage?

200V.