{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6634US","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6634US","canonicalUrl":"https://icboms.com/microchip/1N6634US","factsUrl":"https://icboms.com/api/mcp/products/1N6634US","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology Zener diode, 1N6634US, 3.9 V nominal, 5 W, ±5% tolerance, SQ-MELF E package, D-5B, surface mount, -65°C to 175°C.","salesMarkdown":"## Zener voltage and power rating The 1N6634US is a 3.9 V Zener diode rated for 5 W continuous power dissipation. That 5 W ceiling means the device can handle sustained reverse-bias current without exceeding the junction temperature limit — useful for clamping or regulation in a high-ambient environment like an engine bay or industrial control cabinet. ## Package and mounting Supplied in a SQ-MELF, E case (supplier device package D-5B) — a surface-mount hermetic package. The MELF barrel footprint is common for high-reliability Zener and rectifier diodes; the cylindrical body self-centers during reflow, but the lack of flat sides means the pick-and-place nozzle needs a vacuum cup sized for the barrel diameter. ## Leakage and forward characteristics Reverse leakage is 175 µA max at 1 V reverse voltage — a check for low-power standby circuits where the leakage current could eat into the quiescent budget. Forward voltage is 1.5 V max at 1 A, so the diode can also serve as a general-purpose rectifier in a pinch, though the 5 W dissipation limit governs the average forward current.","metaTitle":"1N6634US Zener Diode, 3.9 V, 5 W, SQ-MELF","metaDescription":"Microchip Technology 1N6634US Zener diode, 3.9 V nominal, 5 W, ±5% tolerance, SQ-MELF E package, -65°C to 175°C. Active production, sourced 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":"1N6634","Impedance (Max) (Zzt)":"500 Ohms","Operating Temperature":"-65°C~175°C","Supplier Device Package":"D-5B","Voltage - Zener (Nom) (Vz)":"3.9 V","Current - Reverse Leakage @ Vr":"175 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.9450","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d8f5875a647571c98402a6a536757bfe.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6634US/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance of the 1N6634US Zener voltage?","answer":"The Zener voltage tolerance is ±5%."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6634US","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6634US 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}}