{"schemaVersion":1,"slug":"set-reset-latch","name":"Set-reset latch","kind":"symbol","abbreviation":"SR-LATCH","aliases":["S R latch","RS bistable","set reset memory"],"category":"logic-signals","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Retains a digital state that is changed by the defined set or reset input conditions.","description":["Retains a digital state that is changed by the defined set or reset input conditions.","On a schematic, identify the set/reset active levels and any prohibited simultaneous condition and trace the stored output and reset/startup logic. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.","Active-high and active-low SR implementations have different input conventions; a bare SR label does not resolve simultaneous-input behaviour.","The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing."],"readingNotes":["Identify the set/reset active levels and any prohibited simultaneous condition.","Trace the stored output and reset/startup logic."],"drawingChecklist":["Label the set/reset active levels and any prohibited simultaneous condition.","Cross-reference the stored output and reset/startup logic.","Add the selected device or circuit documentation revision, power/reference connections and project signal convention."],"distinction":"Active-high and active-low SR implementations have different input conventions; a bare SR label does not resolve simultaneous-input behaviour.","facts":[{"label":"Common schematic mnemonic","value":"SR-LATCH — descriptive only; project/device documentation defines reference designations."},{"label":"Terminal / interface focus","value":"The set/reset active levels and any prohibited simultaneous condition"},{"label":"Artwork scope","value":"Original educational functional/circuit reference; not a selected product pinout."}],"references":[{"sourceId":"pub-electronics-ti-ls279","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}],"related":["transparent-d-latch","plc-io"],"artwork":"electronics-memory-sr","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/set-reset-latch","illustration":{"url":"https://eloragrid.ai/library/illustrations/set-reset-latch.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-electronics-ti-ls279","title":"SN74LS279A — set-reset latches","publisher":"Texas Instruments","url":"https://www.ti.com/product/SN74LS279A","type":"manufacturer","scope":"Public device-function and terminal documentation used as an example of set-reset latches. Example part numbers are manufacturer identifiers, not IEC/IEEE symbol IDs. Device ratings, pin numbering and availability remain in the selected product documentation.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}]}