{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6485US/TR","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6485US-TR","canonicalUrl":"https://icboms.com/microchip/1N6485US-TR","factsUrl":"https://icboms.com/api/mcp/products/1N6485US%2FTR","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6485US/TR Military, MIL-PRF-19500/406 Zener Diode, 3.3 V nominal, 1.5 W, ±5%, SQ-MELF A, Tape & Reel.","salesMarkdown":"## Military-grade 3.3 V zener in hermetic SQ-MELF The 1N6485US/TR is a 3.3 V zener diode qualified to MIL-PRF-19500/406, rated for 1.5 W continuous power dissipation. The SQ-MELF A package is a hermetic, surface-mount ceramic body with metallized end caps — no plastic to outgas or crack in vacuum, high-altitude, or rapid thermal cycling. Operating junction temperature spans -65 to 175 °C, covering the full military temperature envelope. The ±5% tolerance on the nominal 3.3 V zener voltage is the standard tight bin for reference and clamping circuits. Maximum impedance (Zzt) is 10 Ohms at the test current — the dynamic resistance is low enough that the regulation line stays flat across the operating current range, which matters when the diode serves as a shunt regulator or voltage reference in an avionics supply rail. ## Leakage and forward conduction — the fine print Reverse leakage is 50 µA max at 1 V reverse bias — this is the off-state current that bleeds through the junction before breakdown. In a high-impedance bias network, 50 µA can shift the set point; design the divider current to dominate the leakage by at least 10:1. Forward voltage is 1.5 V max at 1 A — the diode can also serve as a high-temperature rectifier in the forward direction, but the 1.5 W total dissipation limits the duty cycle.","metaTitle":"1N6485US/TR Microchip Zener, 3.3 V 1.5 W SQ-MELF, Active","metaDescription":"Microchip 1N6485US/TR military-grade zener diode, 3.3 V nom, 1.5 W, SQ-MELF A, active production. Sourced to order — RFQ for current pricing and availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Series":"Military, MIL-PRF-19500/406","Package":"Tape & Reel (TR)","Tolerance":"±5%","Power - Max":"1.5 W","Mounting Type":"Surface Mount","Package / Case":"SQ-MELF, A","Product Status":"Active","lifecycle_stage":"eol_hot","Impedance (Max) (Zzt)":"10 Ohms","Operating Temperature":"-65°C~175°C(TJ)","Supplier Device Package":"A, SQ-MELF","Voltage - Zener (Nom) (Vz)":"3.3 V","Current - Reverse Leakage @ Vr":"50 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$24.8400","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6485US%2FTR/alternatives.json"},"ai":{"faq":[{"question":"What package does the 1N6485US/TR use?","answer":"The package is SQ-MELF A (surface-mount, ceramic, end-cap terminations), supplied on Tape & Reel. The hermetic seal makes it suitable for military, aerospace, and other high-reliability environments where plastic packages are not acceptable."},{"question":"What is the military specification for this zener diode?","answer":"It is qualified under MIL-PRF-19500/406, the military specification for zener diodes. This covers screening, reliability testing, and traceability requirements for defense and aerospace procurement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6485US-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6485US-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}}