Metal Oxide Field Effect Transistors (MOSFET)

Transistors has at least 3 terminalsis. Voltage/Current to one pair of the terminal changes the current flowing through the other pair of terminals thus used for amplifying or switching electronic signals. 


Metal Oxide Field Effect Transistors (MOSFET)




















MOSFET
-low voltage gain
-high current gain
-very high input impedance
-high output impedance
-low noice generation
-fast switching time
-easily damage by static!!!(USE OF AN ANTI-STRAP IS RECOMMENDED)
-some require an input to turn it "OFF"
-voltage controlled device
-more expancive than BJT

2 Types of mosfet= 'N' channel and 'P' channel

Data sheet

The Linear De-rating Factor, tells you how many watts must be reduce as the temperature increase
example. If the device was operating at 55oC, what would be the max power the device could handle?

(temp needed to operate at) - (normal operating temp) = X
X x (linear derating factor) = Y
(Power Dissipation(PD) - Y = Z <-- this is now the max PD@TC=XoC

55 oC – 25 oC = 30
30 x 0.59 = 17.7
88 – 17.7 = 70.3W – This is now the max PD @ TC = 55 oC.