{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6637US","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6637US","canonicalUrl":"https://icboms.com/microchip/1N6637US","factsUrl":"https://icboms.com/api/mcp/products/1N6637US","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6637US Zener diode, SQ-MELF E package, 5.1 V nominal, 5 W, ±5% tolerance, surface mount.","salesMarkdown":"The 1N6637US is a 5.1 V Zener diode in a SQ-MELF, E case, rated for 5 W continuous power dissipation. The ±5% tolerance means the actual Zener voltage sits between 4.845 V and 5.355 V at the test current — a tight enough window to clamp a 5 V rail without pulling it out of regulation. Maximum impedance (Zzt) is 400 Ohms at the Zener test current. Combined with the 5 µA reverse leakage at 1 V, this diode holds the rail steady under light load; the leakage doubles roughly every 10 °C, so at 125 °C junction it draws about 80 µA — still negligible for a 5 W device. The SQ-MELF (D-5B) package is a hermetic ceramic barrel — it handles the thermal cycling and moisture resistance of avionics or downhole environments without the epoxy crack risk a plastic SOD-123 would carry. The bulk packaging means it ships loose in tubes or bags, not taped-and-reeled — factor that into the pick-and-place feeder setup if the line expects reeled parts.","metaTitle":"1N6637US Zener Diode, 5.1V, 5W, SQ-MELF, Microchip","metaDescription":"Microchip 1N6637US Zener diode, 5.1V nominal, 5W power dissipation, SQ-MELF surface mount package, ±5% tolerance. Active production.","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":"5 W","Mounting Type":"Surface Mount","Package / Case":"SQ-MELF, E","lifecycle_stage":"eol_hot","Base Product Number":"1N6637","Impedance (Max) (Zzt)":"400 Ohms","Operating Temperature":"-65°C~175°C","Supplier Device Package":"D-5B","Voltage - Zener (Nom) (Vz)":"5.1 V","Current - Reverse Leakage @ Vr":"5 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d8f5875a647571c98402a6a536757bfe.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6637US/alternatives.json"},"ai":{"faq":[{"question":"What package does the 1N6637US come in?","answer":"The 1N6637US is supplied in a SQ-MELF, E case (supplier device package D-5B). It is a hermetic ceramic surface-mount barrel — suitable for high-reliability and extreme-temperature applications. The listed packaging is bulk (loose parts), not tape-and-reel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6637US","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6637US 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}}