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Construction of Diac

A diac is a four-layer, two-terminal semiconductor device with a P-N-P-N structure that resembles a bipolar junction transistor but lacks a base terminal and has identical doping in the two end P-layers, giving it symmetrical switching behavior for either voltage polarity. It has two main terminals, MT2 and MTX, but no control terminal like a diode or transistor.

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436 views1 page

Construction of Diac

A diac is a four-layer, two-terminal semiconductor device with a P-N-P-N structure that resembles a bipolar junction transistor but lacks a base terminal and has identical doping in the two end P-layers, giving it symmetrical switching behavior for either voltage polarity. It has two main terminals, MT2 and MTX, but no control terminal like a diode or transistor.

Uploaded by

Mild Steel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Construction of a Diac.

A diac is a P-N-P-N structured four-layer, two-terminal semiconductor device, as shown in


figure.A. MT2 and MTX are the two main terminals of the device. There is no control terminal in
this device. From the diagram, a diac unlike a diode, resembles a bipolar junction transistor
(BJT) but with the following exceptions.

there is no terminal attached to the middle layer (base),

the three regions are nearly identical in size,

the doping level at the two end P-layers is the same so that the device gives symmetrical
switching characteristics for either polarity of the applied voltage.

DIAC Circuit Symbol

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