{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE43ARL4G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE43ARL4G","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE43ARL4G","factsUrl":"https://icboms.com/api/mcp/products/1.5KE43ARL4G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. Mosorb™ series, Zener TVS diode, 1.5KE43ARL4G, 1500W peak pulse power, 36.8V reverse standoff, 40.9V breakdown min, 59.3V clamping, DO-201AD axial, unidirectional.","salesMarkdown":"## Transient protection for legacy board designs The 1.5KE43ARL4G: It clamps transients at 59.3 V maximum while conducting 25.3 A peak pulse current, protecting downstream circuitry on a 36.8 V nominal rail. The DO-201AD axial package suits through-hole mounting on boards where a replacement TVS must drop into an existing footprint without layout changes. ## Parametric fit for 36.8 V rail protection Breakdown occurs at 40.9 V minimum, ensuring the TVS does not conduct during normal operation. The 59.3 V clamping voltage at 25.3 A peak pulse current defines the maximum voltage the load sees during a transient event. For a 36 V bus, this clamp margin is adequate for most secondary protection stages but should be verified against the downstream component's absolute maximum ratings. ## Obsolete status and sourcing path Littelfuse has designated the 1.5KE43ARL4G as obsolete. The Mosorb series includes functionally similar Zener TVS diodes in the same DO-201AD package with different standoff voltages. A parametric search on the 36.8 V standoff and 1500 W rating may identify a currently active alternative, but no pin-compatible drop-in replacement is documented in this record.","metaTitle":"Littelfuse 1.5KE43ARL4G Mosorb Zener TVS, 1500W, DO-201AD","metaDescription":"Obsolete Littelfuse 1.5KE43ARL4G Zener TVS diode, 1500W peak pulse, 36.8V standoff, 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)","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)":"40.9V","Voltage - Clamping (Max) @ Ipp":"59.3V","Voltage - Reverse Standoff (Typ)":"36.8V","Current - Peak Pulse (10/1000µs)":"25.3A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b2bad05ac2a782d44789dbfb00c46ecc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1.5KE43ARL4G?","answer":"The 1.5KE43ARL4G is obsolete and sourced through independent distribution. Submit an RFQ for a lot-specific offer with date-code traceability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE43ARL4G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE43ARL4G 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}}