{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE56ARL4G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE56ARL4G","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE56ARL4G","factsUrl":"https://icboms.com/api/mcp/products/1.5KE56ARL4G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Mosorb™ Series, Zener TVS Diode, 1.5KE56ARL4G, 1500W Peak Pulse, 77V Clamping, DO-201AD Axial, Through Hole.","salesMarkdown":"The 1.5KE56ARL4G: It clamps transients at 77V max, with a reverse standoff of 47.8V and a minimum breakdown of 53.2V. The DO-201AD axial package is through-hole mount, common on power input boards and industrial control panels where a soldered-in transient suppressor is preferred over a surface-mount part for mechanical robustness. The 1500W peak pulse rating at 10/1000µs means this diode can absorb a 19.5A transient current before the clamping voltage rises to 77V. The operating temperature range spans -65°C to 175°C junction, so it handles the thermal extremes of outdoor enclosures or engine compartments. No power line protection is listed — this is a signal or low-voltage DC rail suppressor, not for AC mains. ## Lifecycle reality — obsolete but sourceable Littelfuse lists the 1.5KE56ARL4G as obsolete. That means new designs should look at the current 1.5KE series (same DO-201AD package, same 1500W rating) for a pin-compatible drop-in — the 1.5KE56A variant is the closest active sibling.","metaTitle":"Littelfuse 1.5KE56ARL4G Mosorb Zener TVS, 1500W, 77V Clamp","metaDescription":"Obsolete Littelfuse 1.5KE56ARL4G Zener TVS diode, 1500W peak pulse, 77V clamping, DO-201AD axial.","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":"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)":"53.2V","Voltage - Clamping (Max) @ Ipp":"77V","Voltage - Reverse Standoff (Typ)":"47.8V","Current - Peak Pulse (10/1000µs)":"19.5A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b2bad05ac2a782d44789dbfb00c46ecc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1.5KE56ARL4G?","answer":"The closest active alternative is the 1.5KE56A from the same Mosorb series — same DO-201AD axial package, same 1500W peak pulse rating, same 47.8V standoff and 77V clamp. It is a direct drop-in for the obsolete ARL4G suffix."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE56ARL4G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE56ARL4G 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}}