{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4742AUR","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4742AUR","canonicalUrl":"https://icboms.com/microchip/1N4742AUR","factsUrl":"https://icboms.com/api/mcp/products/1N4742AUR","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4742AUR zener diode, 12 V nominal, 1 W, ±5% tolerance, DO-213AB MELF surface mount.","salesMarkdown":"## 12 V regulation in a MELF barrel The 1N4742AUR is a 12 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 voltage means the actual zener knee sits between 11.4 V and 12.6 V at the test current — tight enough for reference or clamp duties where a few percent off the rail matters. ## Leakage and impedance — the real-world limits Reverse leakage is specified at 5 µA maximum with 9.1 V across the junction — that is 2.9 V below the zener knee, so the diode stays nearly open until the rail approaches regulation. The 9 Ohm maximum zener impedance (Zzt) at the test current sets the dynamic resistance: a 10 mA load step shifts the regulation point by roughly 90 mV, which is predictable for a 1 W part in this voltage class. ## Temperature range and package The DO-213AB MELF (metal electrode leadless face) package is a cylindrical surface-mount body with solderable end caps — it reflows on standard SMT lines but requires careful pad geometry to avoid tombstoning during reflow.","metaTitle":"1N4742AUR Zener Diode, 12 V, 1 W, DO-213AB MELF","metaDescription":"Microchip Technology 1N4742AUR zener diode, 12 V nominal, 1 W, ±5% tolerance, DO-213AB MELF. Active production, available 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":"1N4742","Impedance (Max) (Zzt)":"9 Ohms","Operating Temperature":"-65°C~175°C","Supplier Device Package":"DO-213AB","Voltage - Zener (Nom) (Vz)":"12 V","Current - Reverse Leakage @ Vr":"5 µA @ 9.1 V","Voltage - Forward (Vf) (Max) @ If":"1.2 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.3300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/bc4f081abf264e3fbd0ed0846e93ec3c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the tolerance of the 1N4742AUR zener voltage?","answer":"The 1N4742AUR has a ±5% tolerance on the nominal 12 V zener voltage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4742AUR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4742AUR 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}}