{"schemaVersion":1,"slug":"ansi-diac","name":"ANSI/IEEE DIAC form","kind":"symbol","abbreviation":"DIAC","aliases":["HDI1V3","VDI1V3","IEEE Diac Diode - Two Way","ANSI DIAC"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of diac: a DIAC is a bidirectional triggering semiconductor device used in a documented control circuit.","description":["This reference locates diac in Autodesk's IEEE-oriented semiconductor components family. A DIAC is a bidirectional triggering semiconductor device used in a documented control circuit. Its terminals and breakover characteristics are defined by the selected component. The public library uses HDI1V3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline.","Follow the trigger circuit rather than treating the device as a controlled switch with a separate gate. A DIAC does not have the same controlled gate terminal as a TRIAC. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Follow the trigger circuit rather than treating the device as a controlled switch with a separate gate.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Identify connected terminals","Reference breakover rating","Show associated trigger network"],"distinction":"A DIAC does not have the same controlled gate terminal as a TRIAC.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Semiconductor Components; published form: Diac Diode - Two Way."},{"label":"Public vendor block","value":"HDI1V3. Vendor library token, not an IEEE symbol number."},{"label":"Drawing role","value":"Semiconductor function"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-ec01cfc2-47b9-4ae3-ae5e-0fb86d327a82","relevance":"Public IEEE-oriented Semiconductor Components table explicitly lists HDI1V3 as Diac Diode - Two Way. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["diac","resistor","power-converter"],"artwork":"s28-ansi-diac","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Diac Diode - Two Way","reference":"Autodesk IEEE Symbol Preview: Semiconductor Components, block HDI1V3. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"diac"},"plainEnglish":{"title":"What does ANSI/IEEE DIAC form mean?","introduction":"This reference locates diac in Autodesk's IEEE-oriented semiconductor components family. A DIAC is a bidirectional triggering semiconductor device used in a documented control circuit. Its terminals and breakover characteristics are defined by the selected component. The public library uses HDI1V3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline.","drawings":"Follow the trigger circuit rather than treating the device as a controlled switch with a separate gate. A DIAC does not have the same controlled gate terminal as a TRIAC. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview — Semiconductor Components","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EC01CFC2-47B9-4AE3-AE5E-0FB86D327A82.htm"}],"detail":"IEEE-library form of diac: a DIAC is a bidirectional triggering semiconductor device used in a documented control circuit. A DIAC does not have the same controlled gate terminal as a TRIAC.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-diac","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-diac.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-ec01cfc2-47b9-4ae3-ae5e-0fb86d327a82","title":"Autodesk IEEE Symbol Preview — Semiconductor Components","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EC01CFC2-47B9-4AE3-AE5E-0FB86D327A82.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Semiconductor Components table explicitly lists HDI1V3 as Diac Diode - Two Way. This supports the vendor convention context, not reproduction of the publisher graphic."}]}