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.
Page 1 Text Content
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
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.