{"schemaVersion":1,"slug":"open-collector-buffer","name":"Open-collector buffer","kind":"symbol","abbreviation":"OC-BUF","aliases":["open collector logic","pull up output driver"],"category":"logic-signals","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Provides a logic output through a transistor pull-down stage requiring the documented external load or pull-up.","description":["Provides a logic output through a transistor pull-down stage requiring the documented external load or pull-up.","On a schematic, identify the logic supply, collector output and pull-up/load supply and trace the wired output signal and receiving input. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.","An open collector can sink current under its limits; it does not actively drive the high state like a push-pull output.","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 logic supply, collector output and pull-up/load supply.","Trace the wired output signal and receiving input."],"drawingChecklist":["Label the logic supply, collector output and pull-up/load supply.","Cross-reference the wired output signal and receiving input.","Add the selected device or circuit documentation revision, power/reference connections and project signal convention."],"distinction":"An open collector can sink current under its limits; it does not actively drive the high state like a push-pull output.","facts":[{"label":"Common schematic mnemonic","value":"OC-BUF — descriptive only; project/device documentation defines reference designations."},{"label":"Terminal / interface focus","value":"The logic supply, collector output and pull-up/load supply"},{"label":"Artwork scope","value":"Original educational functional/circuit reference; not a selected product pinout."}],"references":[{"sourceId":"pub-electronics-ti-ls07","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}],"related":["logic-three-state-buffer","plc-io"],"artwork":"electronics-logic-open-collector","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/open-collector-buffer","illustration":{"url":"https://eloragrid.ai/library/illustrations/open-collector-buffer.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-ls07","title":"SN74LS07 — open-collector output buffers","publisher":"Texas Instruments","url":"https://www.ti.com/lit/ds/symlink/sn74ls07.pdf","type":"manufacturer","scope":"Public device-function and terminal documentation used as an example of open-collector output buffers. 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."}]}