{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE20ARL4G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE20ARL4G","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE20ARL4G","factsUrl":"https://icboms.com/api/mcp/products/1.5KE20ARL4G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Mosorb™ series, Zener TVS diode, order code 1.5KE20ARL4G, 1500W peak pulse power, 27.7V clamping voltage, DO-201AD axial through-hole package, unidirectional.","salesMarkdown":"## 1500 W peak pulse, 27.7 V clamp — what the ratings mean for your rail The 1.5KE20ARL4G: Reverse standoff is 17.1 V, meaning the diode draws negligible leakage at normal operating voltage up to that level. Breakdown starts at 19 V minimum, so the device stays off until the transient pushes past that threshold. ## Obsolete — sourcing through independent channels Littelfuse lists the 1.5KE20ARL4G as obsolete. The DO-201AD axial package and through-hole mounting are standard for this power class, so a functional equivalent from another supplier (same package, same voltage and power rating) can be cross-referenced without a board spin, but no pin-compatible direct replacement is published by Littelfuse. ## Temperature range and deployment context Operating junction temperature spans -65°C to 175°C, covering most industrial and automotive under-hood environments. The wide range means the clamping voltage shifts with temperature — the 27.7 V figure is at 25°C; at 175°C the breakdown voltage rises roughly 0.1%/°C, so budget margin if your rail sits near the clamp ceiling at high ambient. General-purpose application classification means it fits power-supply input protection, DC bus clamping, and signal-line transient suppression where unidirectional clamping is acceptable.","metaTitle":"1.5KE20ARL4G Littelfuse TVS Diode, 1.5kW, 27.7V Clamp","metaDescription":"Obsolete Littelfuse 1.5KE20ARL4G Zener TVS, 1500W peak pulse, 27.7V clamping at 54A. DO-201AD axial. Sourced to order against RFQ.","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)","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":"1.5KE","Operating Temperature":"-65°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"Axial","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"19V","Voltage - Clamping (Max) @ Ipp":"27.7V","Voltage - Reverse Standoff (Typ)":"17.1V","Current - Peak Pulse (10/1000µs)":"54A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b2bad05ac2a782d44789dbfb00c46ecc.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE20ARL4G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE20ARL4G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}