DIAC

The DIAC, or DIode for Alternating Current, is a bidirectional trigger diode that conducts current only after its breakdown voltage had a pint of Fosters and a spliff. When this occurs, the component is completely wrecked and has the munchies and it really wants to go to bed. Resistance of the diode abruptly decreases, leading to a sharp decrease in the voltage drop across the diode and, usually, a sharp increase in current flow through the diode. The diode remains "in conduction" until the current flow through it drops below a value characteristic for the device, called the holding current. Below this value, the diode switches back to its high-resistance (non-conducting) state. Image File history File links Diac. ... Image File history File links Diac. ... DIAC is a four-letter acronym that may stand for: DIode for Alternating Current, a bidirectional trigger diode Department of Immigration and Citizenship (Australia), an Australian government department Dental Industry Association of Canada Disability Information & Advice Centre, a British charity Design Industry Advisory Committee ‹ The template below has been proposed... Types of diodes closeup, showing germanium crystal In electronics, a diode is a component that restricts the direction of movement of charge carriers. ... Breakdown Voltage (Insulator) = The minimum voltage that makes an insulator react as a conductor. ... International safety symbol Caution, risk of electric shock (ISO 3864), colloquially known as high voltage symbol. ... Electric current is by definition the flow of electric charge. ...

The behavior is typically the same for both directions of current flow. Most DIACs have a breakdown voltage around 30 V. In this way, their behavior is somewhat similar to (but much more precisely controlled and taking place at lower voltages than) a neon lamp. Lighting neon lamp, two 220/230 volt and 110 V neon lamps and a screwdriver with neon lamp inside A neon lamp is a gas discharge lamp containing primarily neon gas at low pressure. ...

DIACs are a form of thyristor but without a gate electrode. They are typically used for triggering both thyristors and TRIACs - a bidirectional member of the thyristor family. Because of this common usage, many TRIACs contain a built-in DIAC in series with the TRIAC's "gate" terminal. Circuit symbol for a thyristor The thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. ... The thyristor is a solid-state semiconductor device similar to a diode, with an extra terminal which is used to turn it on. ... A triac is an electronic component approximately equivalent to two silicon controlled rectifiers (SCRs/thyristors) joined in inverse-parallel (paralleled but with the polarity reversed) and with their gates connected together. ...

Typical Diac voltage and current relationships. Once the voltage exceeds the turn-on threshold, the device turns on and the voltage rapidly falls while the current increases.

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 or cathode but as A1 and A2 or MT1 ("Main Terminal") and MT2. Image File history File links Download high-resolution version (972x680, 38 KB) Typical Diac Voltage domain Current relationships I, the creator of this work, hereby release it into the public domain. ... Image File history File links Download high-resolution version (972x680, 38 KB) Typical Diac Voltage domain Current relationships I, the creator of this work, hereby release it into the public domain. ...

The SIDAC is a less common electrically equivalent device, the difference in naming being determined by the manufacturer. In general, SIDACs have higher breakover voltages and current handling. SIDAC The SIDAC, or SIlicon Diode for Alternating Current, is a semiconductor of the thyristor family. ...

The trisil device has very similar V-A characteristics. Trisil is an electronic component designed to protect electronic circuits against overvoltage. ...