{"schemaVersion":1,"slug":"npn-darlington-transistor","name":"NPN Darlington transistor","kind":"symbol","abbreviation":"NPN-DAR","aliases":["Darlington pair NPN","high-gain NPN pair"],"category":"electronics-components","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Two NPN transistor stages connected as a Darlington pair to provide a combined current-amplifying device.","description":["Two NPN transistor stages connected as a Darlington pair to provide a combined current-amplifying device.","On a schematic, identify the common collector, input base and output emitter and trace the load and base-drive circuit. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.","A Darlington is a compound connection rather than a single ordinary NPN transistor; its voltage drops and switching behaviour require the device data.","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 common collector, input base and output emitter.","Trace the load and base-drive circuit."],"drawingChecklist":["Label the common collector, input base and output emitter.","Cross-reference the load and base-drive circuit.","Add the selected device or circuit documentation revision, power/reference connections and project signal convention."],"distinction":"A Darlington is a compound connection rather than a single ordinary NPN transistor; its voltage drops and switching behaviour require the device data.","facts":[{"label":"Common schematic mnemonic","value":"NPN-DAR — descriptive only; project/device documentation defines reference designations."},{"label":"Terminal / interface focus","value":"The common collector, input base and output emitter"},{"label":"Artwork scope","value":"Original educational functional/circuit reference; not a selected product pinout."}],"references":[{"sourceId":"pub-electronics-darlington","relevance":"Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored."}],"related":["npn-bipolar-transistor","diode"],"artwork":"electronics-darlington-npn","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/npn-darlington-transistor","illustration":{"url":"https://eloragrid.ai/library/illustrations/npn-darlington-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-darlington","title":"TIP120/TIP125 complementary Darlington transistor documentation","publisher":"STMicroelectronics","url":"https://www.st.com/resource/en/datasheet/tip120.pdf","type":"manufacturer","scope":"Public manufacturer explanation and diagrams of NPN and PNP compound Darlington devices. Educational geometry is independently drawn; package drawings are not rehosted.","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."}]}