{"schemaVersion":1,"slug":"npn-bipolar-transistor","name":"NPN bipolar transistor","kind":"symbol","abbreviation":"NPN","aliases":["NPN BJT","bipolar junction transistor NPN"],"category":"electronics-components","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"A bipolar transistor with base, collector and emitter terminals arranged for NPN operation.","description":["A bipolar transistor with base, collector and emitter terminals arranged for NPN operation.","On a schematic, identify the base drive, collector node and emitter reference and trace the switched or amplified collector circuit. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.","The emitter arrow distinguishes NPN from PNP in common schematics; the package pin order must still come from the selected part.","Terminal letters describe electrical roles, not package pin numbers. Check the selected public datasheet for the actual pin assignment, polarity and any internally connected terminals before completing the drawing."],"readingNotes":["Identify the base drive, collector node and emitter reference.","Trace the switched or amplified collector circuit."],"drawingChecklist":["Label the base drive, collector node and emitter reference.","Cross-reference the switched or amplified collector circuit.","Add the selected device or circuit documentation revision, power/reference connections and project signal convention."],"distinction":"The emitter arrow distinguishes NPN from PNP in common schematics; the package pin order must still come from the selected part.","facts":[{"label":"Common schematic mnemonic","value":"NPN — descriptive only; project/device documentation defines reference designations."},{"label":"Terminal / interface focus","value":"The base drive, collector node and emitter reference"},{"label":"Artwork scope","value":"Original educational component glyph; not a certified standard graphic or package pinout."}],"references":[{"sourceId":"pub-electronics-nexperia-npn","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}],"related":["pnp-bipolar-transistor","diode"],"artwork":"electronics-bjt-npn","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/npn-bipolar-transistor","illustration":{"url":"https://eloragrid.ai/library/illustrations/npn-bipolar-transistor.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-nexperia-npn","title":"BC847 NPN transistor documentation","publisher":"Nexperia","url":"https://assets.nexperia.com/documents/data-sheet/BC847X_SER.pdf","type":"manufacturer","scope":"Public NPN transistor terminal and component reference. The catalogue supplies no manufacturer package pinout or product-rating substitute.","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."}]}