DIAC

A DIAC (initials for the English term DI ode for have lternative C urrent) is an electronics component gathering 2 diodes of the type Zener assembled in parallel, head digs. This component is primarily used for the order of thyristors and triacs.

Characteristic

A DIAC is not conducting at rest (except for the escapes of potential) and becomes it when a potential difference electric higher than its threshold is carried on its terminals.

typical DIAC have a threshold about 32V (between 25V and 45V in general).

Use

Whereas standard a Zener diode is component one-way (it can lead the current only in one direction), a DIAC makes it possible to play the part of zener diode for alternative course. Ideally, a DIAC of threshold 0V would play the part of resistance in an electronic circuit; the not-nullity of the threshold confers a behavior slightly more interesting to him: When the current changes direction, let us suppose that it becomes positive, DIAC becomes blocking until the positive threshold is reached, and this until the current changes direction. DIAC becomes again then blocking and becomes again conducting when the negative threshold is reached. And so on.

On a sinusoid, the result would be the following:

Symmetrical DIAC have the same positive and negative threshold (the most current DIAC).

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