MOSFET Classification Characteristics

MOSFET because of its high input resistance, low noise, thermal stability, integrated advantages in electronic circuits and its large power flow, large operating voltage power supply circuit is widely used; proper application, identify the MOSFET pin, polarity is very important, with the same transistor, need to skillfully identify the MOSFET pin, polarity must first understand its structure and basic principles. MOSFET pin has a gate G, drain D and source S three electrical levels, if the dual-gate tube has four electrical levels.

MOSFETs can be divided into junction MOSFETs and insulated layer gate MOSFETs according to the construction, of which the insulated layer gate MOSFETs are divided into enhancement and depletion; junction MOSFETs “junction” refers to the pn junction, insulated layer gate MOSFETs insulated layer gate refers to a layer of gate and source, drain in the middle. Silicon dioxide cable sheath, there is no conductive connection between them. According to the conductive channel characteristics, junction MOSFET and insulated layer grid MOSFET can be divided into electronic and hole-type channel, it is MOSFET conductive safe channel.MOSFET is attributed to unipolar crystal transistor, transistor is attributed to the bipolar crystal transistor, that is, in front of a kind of free electrons only by a kind of conductive, the latter is a kind of conductive by two kinds of free electrons. MOSFET belongs to the voltage-controlled crystal transistor, according to the gate and the source of the middle of the working voltage shift to change the channel of the conductive work capacity. The triode is classified as a flux-manipulated crystal triode, and the size of the collector junction current is changed according to the shift of the flux.

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