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What does DIAC stand for? 

What does DIAC mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: DIAC.

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DIAC

Diapulse Corporation of America

Business » NASDAQ Symbols

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DIAC

Delft Intelligent Assembly Cell

Computing » Assembly

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DIAC

Department of Immigration and Citizenship

Governmental » Immigration

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DIAC

Defense Intelligence Analysis Center

Governmental » Military

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DIAC

Durham Integrated Arts Camp

Community » Art

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DIAC

Dubai International Arbitration Centre

International

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DIAC

Diversity and Inclusion Action Coalition

Miscellaneous » Unclassified

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DIAC

Dubai International Academic City

Academic & Science

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DIAC

Delaware Information and Analysis Center

Governmental » Law & Legal

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DIAC

Dental Industry Association of Canada

Medical » Dental

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DIAC

Design Industry Advisory Committee

Business » Advisory

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DIAC

Directions in Authenticated Ciphers

Miscellaneous » Unclassified

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DIAC

Disability Information and Advice Centre

Medical » Disability

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DIAC

Dubai International Aquatic Championships

Miscellaneous » Unclassified

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DIAC

Dynamic Ignition Advance Control

Miscellaneous » Automotive

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DIAC

Directions and Implications of Advanced Computing

Computing » IT

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DIAC

Diffusion Industrielle et Automobile Par le Credit

Miscellaneous » Automotive

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DIAC

Diffusion Industrielle Automobile et Agricole Cherifienne

Miscellaneous » Automotive

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What does DIAC mean?

DIAC
The DIAC (diode for alternating current) is a diode that conducts electrical current only after its breakover voltage, VBO, has been reached momentarily. Three, four, and five layer structures may be used. 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, IH. Below this threshold, the diode switches back to its high-resistance, non-conducting state. This behavior is 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 a lower voltages. DIACs have no gate or trigger electrode, unlike some other thyristors that they are commonly used to trigger, such as TRIACs. 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.

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