Editing DIAC (section)

{{Short description|Type of diode}}
{{Other uses}}
{{No footnotes|date=February 2020}}
{{Infobox electronic component
|name              = DIAC
|image             = 
|image_size        =
|caption           = DIAC
|type              = [[Passivity (engineering)|Passive]]
|working_principle = 
|invented          = 
|first_produced    = 
|symbol            = [[Image:Diac.svg|100px]]
|pins              = [[anode]] 1, [[anode]] 2
}}
[[File:D3capas sym.PNG|thumb|80px|Three-layer DIAC]]
The '''DIAC''' ('''diode for alternating current''') is a [[diode]] that conducts [[electrical current]] only after its breakover [[voltage]], V<sub>BO</sub>, has been reached momentarily. Three, four, and five layer structures may be used.<ref>{{cite web |last1=Electronics |first1=Hub |title=Diacs |date=28 March 2024 |url=https://www.electronicshub.org/diac/#DIAC_Construction}}</ref> Behavior is similar to the voltage breakdown of a [[TRIAC]] without a gate terminal.

When breakdown occurs, internal positive feedback (impact ionization or two transistor feedback) ensures that the diode enters a region of [[negative dynamic resistance]], leading to  a sharp increase in current through the diode and a decrease in the voltage drop across it (typically full switch-on takes a few hundred nanoseconds to microseconds). The diode remains in conduction until the current through it drops below a value characteristic for the device, called the ''holding current'', I<sub>H</sub>. Below this threshold, the diode switches back to its high-resistance, non-conducting state. This behavior is [[Bidirectional current|bi-directional]], meaning typically the same for both directions of current.

Most DIACs have a three-layer structure with breakover voltage of approximately 30 V and an on voltage of less than 3 V. Their behavior is analogous to the striking and extinction voltages of a [[neon lamp]], but it can be more repeatable and takes place at lower voltages.

DIACs have no gate or trigger [[electrode]], unlike some other [[thyristor]]s that they are commonly used to trigger, such as [[TRIAC]]s. Some TRIACs, like [[Quadrac]], contain a built-in DIAC in series with the TRIAC's gate terminal for this purpose.

DIACs are also called "symmetrical trigger diodes" due to the symmetry of their characteristic curve. Because DIACs are bidirectional devices, their terminals are not labeled as anode and cathode but as A1 and A2 or main terminal MT1 and MT2.
[[File:Kennlinie DIAC.svg|thumb|Typical DIAC voltage and current relationships. V<sub>BO</sub> is the breakover voltage.]]