The DIAC is a diode that conducts electrical current only after its breakover voltage, VBO, has been reached momentarily. The term is an acronym of “diode for. Find great deals for ER DIAC Diode Case Do7 Make STMicroelectronics X 5 Pieces. Shop with confidence on eBay!. Diac Diotec DB3 / BR, ER / Diotec. Homepage ▻ Electronic components Diac 28 36V / IbER or D30 type.

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DIAC – Wikipedia

This page was last edited on 1 Juneddiac DIACs are also called “symmetrical trigger diodes” due to the symmetry of their characteristic curve. Below this value, the diode switches back to its high-resistance, non-conducting state.

This behavior is bidirectional, meaning typically the same for both directions of current. Somewhat uncommon in most electronicsthe SIDAC is dica to the status of a special purpose device.

From Wikipedia, the free encyclopedia. In many applications this function is now served by metal oxide varistors MOVsparticularly for trapping voltage transients on the power mains.


The term is an acronym of “diode for alternating current”. Potentiometer digital Variable capacitor Varicap. For other uses, see DIAC disambiguation. Their behavior is similar to that of a neon lampbut it can be more precisely controlled and takes place at a lower voltage. Views Read Edit View history. Retrieved from ” https: These are designed to tolerate large surge currents for the suppression of overvoltage transients.

Also referred to as a SYDAC Silicon thYristor for Alternating Currentbi-directional thyristor breakover diodeor more simply a bi-directional thyristor diode, it is technically specified as a bilateral voltage triggered switch.

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The SIDAC remains nonconducting until the applied voltage meets or exceeds its rated breakover voltage. In other projects Wikimedia Commons.

Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. When breakdown occurs, the diode enters a region of negative dynamic resistanceleading to a decrease in the voltage drop across the diode and, usually, a sharp increase in current through the diode.

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However, where part-counts are to be kept low, simple relaxation oscillators are needed, and when the voltages are too low for practical operation of a spark gap, the SIDAC is an indispensable component. The operation of the SIDAC is functionally similar to that of a spark gapbut is unable to reach its higher temperature ratings.


By using this site, you agree to the Terms of Use and Privacy Policy. The diode remains in conduction until the current through it drops below a value characteristic for the device, called the holding currentI H.

Once entering this conductive state going through the negative dynamic resistance region, the SIDAC continues to conduct, regardless of voltage, until the applied current falls below its rated holding current. Diodes Solid state switches. In general, SIDACs have higher breakover voltages and current handling capacities er9900 DIACs, so they can be directly used for switching and not just for triggering of another switching device.