{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4742CPE3/TR12","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4742CPE3-TR12","canonicalUrl":"https://icboms.com/microchip/1N4742CPE3-TR12","factsUrl":"https://icboms.com/api/mcp/products/1N4742CPE3%2FTR12","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4742CPE3/TR12 Zener Diode, 12 V nominal, 1 W, ±2% tolerance, DO-204AL (DO-41) Axial, Tape & Reel.","salesMarkdown":"## 12 V zener — 1 W rating and ±2% tolerance The 1N4742CPE3/TR12 is a 12 V zener diode rated for 1 W continuous power dissipation in the standard DO-204AL (DO-41) axial-lead package. The ±2% tolerance band means the actual zener voltage falls between 11.76 V and 12.24 V at the specified test current — tighter than the common 5% grade, so it suits precision shunt regulation or voltage reference circuits where the rail must stay within a narrow window. Maximum zener impedance is 9 Ohms (Zzt) at the test current; this value governs how much the output voltage shifts with changing load current. The lower the impedance, the stiffer the regulation — 9 Ohms is typical for a 1 W, 12 V device in this family. ## Temperature range and reverse leakage A design running at 85°C ambient still has 65°C margin to the absolute maximum, which matters when the diode shares a board with hot-running passives or sits in an outdoor enclosure. Reverse leakage is specified at 5 µA maximum with 9.1 V applied across the junction — well below the 12 V breakdown knee. In a battery-powered reference circuit, this leakage contributes to the quiescent draw; at 5 µA it is negligible against a typical coin-cell self-discharge rate. Forward voltage is 1.2 V maximum at 200 mA forward current — the standard silicon diode drop. If the part is ever forward-biased in the application (e.g., during a reverse-polarity transient), the 1 W power rating limits the forward current to about 830 mA continuous before the die exceeds its thermal budget. Sourced to order through independent distribution channels.","metaTitle":"Microchip 1N4742CPE3/TR12 Zener Diode, 12 V, 1 W, DO-41","metaDescription":"Microchip 1N4742CPE3/TR12 12 V zener diode, 1 W, ±2% tolerance, DO-204AL (DO-41) axial package. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Series":"-","Package":"Tape & Reel (TR)","Tolerance":"±2%","Power - Max":"1 W","Mounting Type":"Through Hole","Package / Case":"DO-204AL, DO-41, Axial","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"1N4742","Impedance (Max) (Zzt)":"9 Ohms","Operating Temperature":"-65°C~150°C","Supplier Device Package":"DO-204AL (DO-41)","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":"$1.1100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f2579cdb7aec091d0b5f99df5459e04c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the tolerance of the 1N4742CPE3/TR12 zener voltage?","answer":"The zener voltage tolerance is ±2%, tighter than the standard 5% grade. For a 12 V nominal device, the actual voltage falls between 11.76 V and 12.24 V at the specified test current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4742CPE3-TR12","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4742CPE3-TR12 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}}