Fairchild FDH44N50 Data Handbook
Summary
Optimize your power electronics designs with this high-performance MOSFET. Built for efficiency, the FDH44N50 is ideal for advanced Switch Mode Power Supplies (SMPS), PFC Boost, and various converter topologies requiring reliable operation up to 175°C. This comprehensive technical resource provides complete electrical specifications—including details on low gate charge, fast switching speed, and reduced power losses—making it an essential guide for power engineers selecting components for high-density, efficient systems.
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44N 50FDH44N50
August 2002
44A, 500V, 0.12 Ohm, N-Channel SMPS Power MOSFET Applications Features
Switch Mode Power Supplies(SMPS), such as Low Gate Charge Qg results in Simple Drive Requirement
PFC Boost
Two-Switch Forward Converter Improved Gate, Avalanche and High Reapplied dv/dt Ruggedness
Single Switch Forward Converter
Reduced r DS(ON)
Flyback Converter
Buck Converter Reduced Miller Capacitance and Low Input Capacitance
High Speed Switching
Improved Switching Speed with Low EMI
175°C Rated Junction Temperature
Package Symbol
JEDEC TO-247
SOURCE DRAIN
DRAIN (FLANGE)
Absolute Maximum Ratings TC = 25o C unless otherwise noted Symbol Parameter Ratings Units
VDSS Drain to Source Voltage
VGS Gate to Source Voltage ±30
Drain Current Continuous (TC = 25o C, VGS = 10V) 44
Continuous (TC = 100o C, VGS = 10V) 32 Pulsed1 Power dissipation
Derate above 25o C W/o C o C
TJ, TSTG Operating and Storage Temperature -55 to 175
Soldering Temperature for 10 seconds 300 (1.6mm from case) Mounting Torque, 8-32 or M3 Screw 10ibf*in (1.1N*m)
Thermal Characteristics
RθJC Thermal Resistance Junction to Case 0.2 RθCS Thermal Resistance Case to Sink, Flat, Greased Surface 0.24 o C/W
RθJA Thermal Resistance Junction to Ambient
©2002 Fairchild Semiconductor Corporation FDH44N50 Rev. A4, August 2002
Page Summary Contents For Fairchild FDH44N50 Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 6 |
| File Size | 133.42 KB |
| Published | July 22, 2026 |
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Frequently Asked Questions
What is the Drain to Source On-Resistance (RDS(ON))?
The typical value of RDS(ON) is 0.12 Ohm at V = 10V and I = 22A.
What are the absolute maximum operational ratings for this MOSFET?
Maximum operating temperature is -55 to 175°C, and the drain-to-source voltage (VDSS) is rated up to 500 V.
How does the device perform under different junction temperatures?
The RDS(ON) increases as junction temperature falls from 175°C down to room temperature.