{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4730AUR","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4730AUR","canonicalUrl":"https://icboms.com/microchip/1N4730AUR","factsUrl":"https://icboms.com/api/mcp/products/1N4730AUR","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4730AUR Zener diode, 3.9 V nominal, 1 W, ±5% tolerance, DO-213AB MELF surface mount, -65°C to 175°C.","salesMarkdown":"The 1N4730AUR is a 3.9 V Zener diode from Microchip Technology, rated for 1 W continuous power dissipation in the DO-213AB MELF package. The ±5% tolerance on the nominal 3.9 V breakdown means the actual Zener voltage for any given unit sits between 3.705 V and 4.095 V — tight enough to clamp a 3.3 V logic rail or provide a stable reference for a low-voltage bias circuit without an external trim. The 9 Ohm maximum Zener impedance (Zzt) at the test current means the regulation slope is shallow — a 10 mA change in current shifts the output voltage by roughly 90 mV, which is acceptable for a shunt regulator or protection clamp but not for a precision reference without a buffer. ## Leakage and forward drop — the second-order specs that matter Reverse leakage is specified at 50 µA maximum at 1 V reverse bias — well below the breakdown knee, so this is the leakage before the diode starts conducting. At 25°C the actual leakage is typically much lower, but the 50 µA ceiling is the number to budget for a high-impedance node that sits below the Zener voltage. Forward voltage is 1.2 V maximum at 200 mA forward current. If the diode is used as a general-purpose rectifier or flyback clamp in the forward direction, the 1.2 V drop at 200 mA means the power dissipation in forward conduction adds to the thermal budget — the 1 W total power limit applies to both forward and reverse operation combined.","metaTitle":"1N4730AUR Zener Diode, 3.9 V, 1 W, DO-213AB MELF","metaDescription":"Microchip Technology 1N4730AUR Zener diode, 3.9 V nominal, 1 W, ±5% tolerance, DO-213AB MELF, -65 to 175 °C. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Series":"-","Package":"Bulk","Tolerance":"±5%","Power - Max":"1 W","Mounting Type":"Surface Mount","Package / Case":"DO-213AB, MELF","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"1N4730","Impedance (Max) (Zzt)":"9 Ohms","Operating Temperature":"-65°C~175°C","Supplier Device Package":"DO-213AB","Voltage - Zener (Nom) (Vz)":"3.9 V","Current - Reverse Leakage @ Vr":"50 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.2 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.3300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/bc4f081abf264e3fbd0ed0846e93ec3c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N4730AUR/alternatives.json"},"ai":{"faq":[{"question":"What is the 1N4730AUR used for?","answer":"It is a 3.9 V Zener diode used for voltage regulation, shunt clamping, or as a low-voltage reference in circuits that need a stable 3.9 V rail."},{"question":"What package does the 1N4730AUR come in?","answer":"The DO-213AB MELF (Metal Electrode Leadless Face) package — a cylindrical glass body with metallized end caps, surface-mount, compatible with standard MELF resistor footprints."},{"question":"What is the tolerance of the 1N4730AUR?","answer":"±5% on the nominal 3.9 V Zener voltage, so the actual breakdown sits between 3.705 V and 4.095 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4730AUR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4730AUR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}