{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6491US/TR","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N6491US-TR","canonicalUrl":"https://icboms.com/microchip/1N6491US-TR","factsUrl":"https://icboms.com/api/mcp/products/1N6491US%2FTR","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N6491US/TR Zener diode, 5.6 V nominal, 1.5 W power dissipation, ±5% tolerance, SQ-MELF surface mount package, Tape & Reel.","salesMarkdown":"The 1N6491US/TR is a 5.6 V Zener diode rated for 1.5 W continuous power dissipation. The 5 Ohm maximum impedance (Zzt) at the test current means the regulation voltage shifts by up to 5 mV per mA of load change — tight enough for many reference and bias applications, but not a precision bandgap substitute. The ±5% tolerance on Vz means a 5.6 V part can land anywhere from 5.32 V to 5.88 V; if your circuit needs a tighter window, you may need to sort or select a different grade. ## Leakage, forward drop, and temperature range Reverse leakage is specified at 500 nA maximum when the applied voltage is 2 V — well below the Zener knee, so this is the leakage you see in a circuit that back-biases the diode below its regulation voltage. The forward voltage (Vf) is 1.5 V maximum at 1 A forward current, meaning the diode can also serve as a moderate-current rectifier or flyback clamp if the application needs it, though the 1.5 W power limit still governs. The SQ-MELF (A-case) package is a hermetic glass body with metallized end caps — it handles thermal cycling and moisture better than plastic SMD packages, which is why you see it in avionics, downhole tools, and other high-reliability environments where a plastic SOD-123 or SOT-23 would risk cracking or delamination.","metaTitle":"Microchip 1N6491US/TR Zener Diode, 5.6 V, 1.5 W, SQ-MELF","metaDescription":"Microchip 1N6491US/TR Zener diode, 5.6 V nominal, 1.5 W power dissipation, SQ-MELF surface mount, -65 to 175°C. Active production, available to order.","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)","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)":"5 Ohms","Operating Temperature":"-65°C~175°C(TJ)","Supplier Device Package":"A, SQ-MELF","Voltage - Zener (Nom) (Vz)":"5.6 V","Current - Reverse Leakage @ Vr":"500 nA @ 2 V","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$13.5300","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6491US%2FTR/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 1N6491US/TR and get a price?","answer":"The 1N6491US/TR is sourced to order against an RFQ through independent and authorized distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N6491US-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N6491US-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}}