{"schemaVersion":1,"slug":"phototransistor-optocoupler","name":"Phototransistor optocoupler","kind":"symbol","abbreviation":"OPTO-TR","aliases":["optoisolator transistor output","optical transistor isolator"],"category":"electronics-components","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"An optical isolation component using an input light emitter and a transistor output on the isolated side.","description":["An optical isolation component using an input light emitter and a transistor output on the isolated side.","On a schematic, identify the emitter current circuit, output collector/emitter and isolation boundary and trace the isolated input status or feedback path. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.","Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.","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 emitter current circuit, output collector/emitter and isolation boundary.","Trace the isolated input status or feedback path."],"drawingChecklist":["Label the emitter current circuit, output collector/emitter and isolation boundary.","Cross-reference the isolated input status or feedback path.","Add the selected device or circuit documentation revision, power/reference connections and project signal convention."],"distinction":"Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.","facts":[{"label":"Common schematic mnemonic","value":"OPTO-TR — descriptive only; project/device documentation defines reference designations."},{"label":"Terminal / interface focus","value":"The emitter current circuit, output collector/emitter and isolation boundary"},{"label":"Artwork scope","value":"Original educational functional/circuit reference; not a selected product pinout."}],"references":[{"sourceId":"pub-electronics-vishay-opto","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}],"related":["solid-state-relay","diode"],"artwork":"electronics-opto-transistor","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/phototransistor-optocoupler","illustration":{"url":"https://eloragrid.ai/library/illustrations/phototransistor-optocoupler.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-vishay-opto","title":"Optocoupler output-family reference","publisher":"Vishay","url":"https://www.vishay.com/en/optocouplers/","type":"manufacturer","scope":"Public family information for phototransistor and other optocoupler outputs, including application documentation. Isolation ratings and output operating method must be selected from the actual device.","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."}]}