{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4744UR-1/TR","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4744UR-1-TR","canonicalUrl":"https://icboms.com/microchip/1N4744UR-1-TR","factsUrl":"https://icboms.com/api/mcp/products/1N4744UR-1%2FTR","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4744UR-1/TR Zener diode, 15 V nominal, 1 W, ±10% tolerance, DO-213AB MELF (glass) package, surface mount, Tape & Reel.","salesMarkdown":"## 15 V rail clamp in a glass MELF The 1N4744UR-1/TR is a 15 V Zener diode in a DO-213AB MELF (glass) package, rated for 1 W continuous power dissipation. The 15 V nominal regulation point makes it a direct fit for clamping a 12 V rail or providing a local reference in a mixed-signal supply. The reflow profile follows the solder-paste recommendation for the board's pad geometry; the glass body handles the heat without cracking, but the end-cap solder joints need a consistent thermal profile to avoid tombstoning. ## 1 W in a small footprint — thermal reality 1 W maximum power at 25°C ambient means the junction temperature rise is limited by the board's copper area under the MELF. At 15 V and 66 mA (the 1 W corner), the glass body conducts heat to the end caps; the PCB land pattern should match the recommended pad size in the datasheet to keep the junction below 175°C. The -65°C to 175°C operating range covers military and aerospace temperature grades — the diode stays within spec from a cold-soak satellite start to an engine-bay hot spot. The glass MELF seals against moisture ingress better than a plastic SOD package, which matters for conformal-coated or high-reliability assemblies.","metaTitle":"Microchip 1N4744UR-1/TR Zener Diode, 15 V, 1 W","metaDescription":"Microchip Technology 1N4744UR-1/TR Zener diode, 15 V nominal, 1 W, ±10% tolerance, DO-213AB MELF, -65°C to 175°C. Active production, sourced per 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) Cut Tape (CT)","Tolerance":"±10%","Power - Max":"1 W","Mounting Type":"Surface Mount","Package / Case":"DO-213AB, MELF (Glass)","Product Status":"Active","lifecycle_stage":"eol_hot","Impedance (Max) (Zzt)":"14 Ohms","Operating Temperature":"-65°C ~ 175°C","Supplier Device Package":"DO-213AB (MELF, LL41)","Voltage - Zener (Nom) (Vz)":"15 V","Current - Reverse Leakage @ Vr":"5 µA @ 11.4 V","Voltage - Forward (Vf) (Max) @ If":"1.2 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.4300","priceTiers":[{"qty":1,"price":"$3.43000","currency":"USD"},{"qty":100,"price":"$3.19000","currency":"USD"},{"qty":269,"price":"$3.19004","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a0251be6a72aede31ddcae209e0fcbbb.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N4744UR-1%2FTR/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance and leakage of the 1N4744UR-1/TR?","answer":"The Zener voltage tolerance is ±10%. Reverse leakage current is 5 µA maximum at 11.4 V reverse voltage. For a 15 V rail clamp, the leakage at the operating point is well below 5 µA — negligible for most bias and protection circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4744UR-1-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4744UR-1-TR 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}}