{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6277ARL4G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1N6277ARL4G","canonicalUrl":"https://icboms.com/littelfuse-inc/1N6277ARL4G","factsUrl":"https://icboms.com/api/mcp/products/1N6277ARL4G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Mosorb™ Zener, 1N6277ARL4G, 1500W peak pulse, 15.3V reverse standoff (typ), 17.1V minimum breakdown, 25.2V clamping maximum, DO-201AD axial through-hole.","salesMarkdown":"## What the voltage ratings mean for a TVS selection The 1N6277ARL4G: For a 24 V rail with transients, that 15.3 V standoff gives roughly 9 V of headroom before the device turns on — enough to keep the line unclamped under normal switching while snapping shut on a surge. The clamping voltage at 25.2 V is the number that sizes the downstream IC's abs-max margin. ## Temperature grade and the 175°C junction ceiling Rated from -65°C to 175°C junction temperature — that range puts the Mosorb™ series in industrial and automotive-adjacent environments rather than consumer electronics. A 175°C TJ ceiling with a typical board-level thermal resistance on a DO-201AD gives real headroom in enclosed panels or under-hood instrument clusters where ambient can spike. The lead solder joint and the axial lead thermal resistance are the limiting path to the ambient; a long lead length into a heat-sinking plane can drop the effective TJ significantly below the 175°C rating at full pulse. ## Sourcing reality — obsolete with no named successor There is no cross-reference to a pin-compatible replacement in the current Mosorb™ line. For a new design this means a parametric re-evaluation against the current Littelfuse TPSMB or 1.5KE series is required before committing to the BOM — the board footprint may be reusable if the DO-201AD package is retained, but the exact clamping characteristics need verification against the current datasheet revision.","metaTitle":"Littelfuse 1N6277ARL4G Zener, 1.5kW Peak Pulse, DO-201AD","metaDescription":"Obsolete Littelfuse Mosorb™ Zener, 15.3V standoff / 17.1V breakdown / 25.2V clamping at 1.5 kW peak pulse.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"Mosorb™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AD, Axial","Product Status":"Obsolete","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1N6277A","Operating Temperature":"-65°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"Axial","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"17.1V","Voltage - Clamping (Max) @ Ipp":"25.2V","Voltage - Reverse Standoff (Typ)":"15.3V","Current - Peak Pulse (10/1000µs)":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b2bad05ac2a782d44789dbfb00c46ecc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6277ARL4G/alternatives.json"},"ai":{"faq":[{"question":"What does the Mosorb™ series designation tell me about this Zener?","answer":"Mosorb™ is Littelfuse's screened Zener / TVS series — the series name on the listing indicates a product family rated for transient suppression on power and signal lines, not a precision voltage reference. The general-purpose application tag and the 1.5 kW peak pulse rating are consistent with a clamp-for-surge role rather than a regulation function."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1N6277ARL4G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1N6277ARL4G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T16:43:13.822Z","lastPublished":"2026-07-22T16:43:13.822Z","indexable":true}}