{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6636US","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6636US","canonicalUrl":"https://icboms.com/microchip/1N6636US","factsUrl":"https://icboms.com/api/mcp/products/1N6636US","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6636US Zener diode, 4.7 V nominal, 5 W, ±5% tolerance, SQ-MELF surface-mount package, D-5B.","salesMarkdown":"## Zener regulation at 4.7 V, 5 W in a hermetic MELF The 1N6636US is a 4.7 V zener diode rated for 5 W continuous power dissipation in a SQ-MELF, E surface-mount package. The ±5% tolerance on the nominal voltage means the actual zener voltage at the test current falls between 4.465 V and 4.935 V — tight enough for most rail-clamp or reference applications that do not require a precision bandgap. Maximum zener impedance is 450 Ohms at the specified test current; this sets the dynamic resistance the load sees when the diode regulates. Reverse leakage is 20 µA at 1 V reverse bias, and forward voltage drop is 1.5 V max at 1 A — the diode can handle brief forward-current surges during reverse-polarity events without exceeding the junction rating. ## Hermetic SQ-MELF package and temperature range The SQ-MELF, E (D-5B supplier device package) is a hermetic, ceramic-bodied surface-mount package designed for high-reliability environments. The -65°C to +175°C operating temperature range covers military and aerospace thermal profiles — the hermetic seal prevents moisture ingress and parameter drift through temperature cycling. The package is supplied in Bulk format, which suits low-to-medium volume assembly or prototype builds where tape-and-reel handling is not required.","metaTitle":"Microchip 1N6636US Zener Diode, 4.7 V, 5 W, SQ-MELF","metaDescription":"1N6636US Zener diode, 4.7 V nominal, 5 W power dissipation, ±5% tolerance. SQ-MELF surface-mount package. Active production. Quoted 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":"5 W","Mounting Type":"Surface Mount","Package / Case":"SQ-MELF, E","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"1N6636","Impedance (Max) (Zzt)":"450 Ohms","Operating Temperature":"-65°C~175°C","Supplier Device Package":"D-5B","Voltage - Zener (Nom) (Vz)":"4.7 V","Current - Reverse Leakage @ Vr":"20 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$13.1700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d8f5875a647571c98402a6a536757bfe.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6636US/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6636US","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6636US 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}}