{"schemaVersion":1,"slug":"photodiode","name":"Photodiode","kind":"symbol","abbreviation":"PD","aliases":["HDI1B4","VDI1B4"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A photodiode is a light-sensitive semiconductor device used in a documented sensing circuit.","description":["A photodiode is a light-sensitive semiconductor device used in a documented sensing circuit. Its electrical connections and optical input are separate aspects of the representation."],"readingNotes":["Identify whether the associated circuit biases the diode or measures its generated response.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Show polarity and bias circuit","Reference optical input","State selected device type"],"distinction":"A photodiode senses light; an LED emits light.","facts":[{"label":"Drawing role","value":"Semiconductor function"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HDI1B4, VDI1B4 (Autodesk identifiers; not IEC symbol numbers)"},{"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."}],"references":[{"sourceId":"pub-symbol-semiconductors","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["resistor","power-converter"],"artwork":"edu-photodiode","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/photodiode","illustration":{"url":"https://eloragrid.ai/library/illustrations/photodiode.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-semiconductors","title":"AutoCAD Electrical: Semiconductor components","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-AC954072-7314-4682-88AF-38160D61E9A2.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}