{"schemaVersion":1,"slug":"ansi-three-input-and-gate","name":"ANSI three-input AND gate","kind":"symbol","abbreviation":"AND3","aliases":["3-input AND gate","triple-input AND","distinctive-shape AND3"],"category":"logic-signals","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"D-shaped AND outline with three input leads; the output is high only when all three inputs are high.","description":["The three-input AND keeps the familiar flat-backed D outline and simply adds a third input lead on the flat side. All three inputs must be at logic 1 in positive logic for the output to be at logic 1. Packages such as triple three-input AND devices provide this function directly.","Drafters use the wider gate rather than cascading two-input gates when the function is a single permissive with three conditions, such as guard closed, pressure healthy and mode selected. A single symbol keeps the logic readable and avoids implying an intermediate signal that does not exist.","The outline does not show whether an unused input is tied high when a three-input part is used for two signals. Unused inputs on the physical device need a defined level shown on the schematic."],"readingNotes":["Count the input leads; a third input is easy to overlook where leads are closely spaced.","Check unused inputs are tied to a defined level."],"drawingChecklist":["Space the three inputs evenly along the flat side.","Label each permissive signal.","Show tie-offs for unused inputs on multi-input packages."],"distinction":"A two-input AND followed by another AND produces the same logic but implies an intermediate net.","facts":[{"label":"Inputs","value":"Three"},{"label":"Example device family","value":"Triple three-input AND packages"},{"label":"Artwork scope","value":"Original educational illustration; consult the applicable standard and the selected device documentation for the exact graphic"}],"references":[{"sourceId":"s28-ti-hc11","relevance":"Manufacturer documentation for triple three-input AND gates."}],"related":["logic-and-gate","iec-and-gate","ansi-four-input-nand-gate"],"artwork":"s28-ansi-three-input-and-gate","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"D-shaped AND outline with three inputs","reference":"Distinctive-shape form as used in IEEE/ANSI-style schematics and manufacturer data books. Independent educational drawing; exact standard geometry and compliance are not asserted. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.","counterpart":"logic-and-gate"},"plainEnglish":{"title":"What does ANSI three-input AND gate mean?","introduction":"The three-input AND keeps the familiar flat-backed D outline and simply adds a third input lead on the flat side. All three inputs must be at logic 1 in positive logic for the output to be at logic 1. Packages such as triple three-input AND devices provide this function directly.","example":"Drafters use the wider gate rather than cascading two-input gates when the function is a single permissive with three conditions, such as guard closed, pressure healthy and mode selected. A single symbol keeps the logic readable and avoids implying an intermediate signal that does not exist.","drawings":"The outline does not show whether an unused input is tied high when a three-input part is used for two signals. Unused inputs on the physical device need a defined level shown on the schematic.","terms":[{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"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":"SNx4HC11 triple 3-input AND gates","url":"https://www.ti.com/lit/ds/symlink/sn74hc11.pdf"}],"detail":"D-shaped AND outline with three input leads; the output is high only when all three inputs are high. A two-input AND followed by another AND produces the same logic but implies an intermediate net.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-three-input-and-gate","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-three-input-and-gate.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-ti-hc11","title":"SNx4HC11 triple 3-input AND gates","publisher":"Texas Instruments","url":"https://www.ti.com/lit/ds/symlink/sn74hc11.pdf","type":"manufacturer","scope":"Device documentation for three-input AND gates.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Manufacturer documentation for triple three-input AND gates."}]}