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Hello everyone, in this lesson we will learn the code name of the MOS tube

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First of all, let's look at the circuit symbol of the MOS tube

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MOS tubes can be divided into N-channel MOS tubes and P-channel MOS tubes according to different structures.

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Therefore, there are two types of circuit symbols for MOS tubes.

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These two circuit symbols look very similar, only the direction of the small arrow in the middle is different

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So how do we tell the difference?

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We first need to expand the triangle corresponding to the G pole into a circuit symbol of a diode

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After the expansion, let's first look at the circuit symbol on the left

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The G pole corresponds to the negative pole of the diode, and the negative pole is also the N pole.

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Then the MOS tube on the left is an N-channel MOS tube

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Let's look at the circuit symbol on the right again.

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Corresponding to the G pole is the positive pole of the diode, which is exactly P

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Then the one on the right is the P-channel MOS tube

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MOS tube can also be represented by Q, and Q is also used to represent triode

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So when we see Q in the circuit diagram,

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it is best to look at his circuit symbol to confirm what component he is

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At the same time, we can also judge its pin definition according to the circuit symbol of the MOS tube.

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The MOS tube has a total of 3 poles, D pole, G pole and S pole

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By observing the circuit symbol in the lower left figure,

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we can know that pins 1, 2, and 3 of this MOS tube are the S pole,

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pin 5 is the D pole, and pin 4 is the G pole.