{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE43ARL4","brand":"onsemi","brandSlug":"onsemi","productSlug":"1.5KE43ARL4","canonicalUrl":"https://icboms.com/onsemi/1.5KE43ARL4","factsUrl":"https://icboms.com/api/mcp/products/1.5KE43ARL4","rawCanonicalId":null},"summary":{"shortDescription":"onsemi Mosorb™ series, Zener TVS, DO-201AD axial, 1500W peak pulse power, 40.9V breakdown (min), 59.3V clamping @ 25.3A, -65°C~175°C operation, unidirectional.","salesMarkdown":"## What this Zener TVS protects and where it fits The 1.5KE43ARL4 is a unidirectional Zener transient-voltage suppressor from the onsemi Mosorb™ family, rated for 1500W peak pulse power (10/1000µs waveform). It clamps a transient at 59.3V maximum when the surge current reaches 25.3A, with a reverse standoff voltage of 36.8V – meaning the protected rail should stay below that DC level to avoid leakage. The DO-201AD axial-lead package is through-hole mounted, suited for general-purpose board-level transient protection where a soldered lead provides mechanical robustness over surface-mount alternatives. ## Breakdown voltage, clamping, and operating range Minimum breakdown voltage is 40.9V, which means the device starts conducting (and thus protecting) once the transient exceeds that threshold. The clamping voltage at peak pulse current is 59.3V – the maximum voltage the protected circuit will see during a surge event. Operating junction temperature spans -65°C to 175°C, covering most industrial and automotive under-hood environments without derating concerns at the high end. ## Obsolete – last-time-buy and sourcing reality onsemi has marked the 1.5KE43ARL4 as Obsolete.","metaTitle":"1.5KE43ARL4 onsemi Mosorb™ Zener TVS – Obsolete","metaDescription":"onsemi 1.5KE43ARL4 Zener TVS, 1500W peak pulse, 36.8V standoff, 59.3V clamping. Obsolete – confirm BOM fit and sourcing options.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"onsemi","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":"eol_hot","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/717ad1fc0ab391931f54c66e75e89e87.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the 1.5KE43ARL4 obsolete, and what are the alternatives?","answer":"Yes, onsemi lists the 1.5KE43ARL4 as Obsolete. A direct alternative is the standard 1.5KE43A (without the RL4 suffix) if still active – check with onsemi or a distributor. Other 1500W axial Zener TVS diodes with a 40.9V breakdown from brands like Littelfuse or Vishay are parametric cross-shoppers; confirm the package (DO-201AD) and clamping voltage match your rail."},{"question":"Can the 1.5KE43ARL4 be replaced with a standard 1.5KE43A?","answer":"The standard 1.5KE43A shares the same base product number and electrical ratings (40.9V breakdown, 59.3V clamping, 1500W). The RL4 suffix only indicates Tape & Reel packaging; a standard 1.5KE43A in bulk or ammo-pack is electrically identical. Verify the packaging format your assembly line accepts before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/1.5KE43ARL4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/1.5KE43ARL4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:12:52.202Z","lastPublished":"2026-07-17T20:12:52.202Z","indexable":true}}