{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE51ARL4","brand":"onsemi","brandSlug":"onsemi","productSlug":"1.5KE51ARL4","canonicalUrl":"https://icboms.com/onsemi/1.5KE51ARL4","factsUrl":"https://icboms.com/api/mcp/products/1.5KE51ARL4","rawCanonicalId":null},"summary":{"shortDescription":"onsemi Mosorb™ Zener TVS, 1.5KE series, 1500W peak pulse power, 43.6V reverse standoff, 48.5V breakdown, 70.1V clamping, DO-201AD axial package","salesMarkdown":"## Zener TVS for 43.6V rails – 1500W pulse capability The 1.5KE51ARL4 is an onsemi Mosorb™ Zener TVS diode rated for 1500W peak pulse power (10/1000µs waveform) with a reverse standoff voltage of 43.6V and a clamping voltage of 70.1V at 21.4A peak pulse current. Housed in a DO-201AD axial package, it operates from -65°C to 175°C junction temperature, making it suitable for high-temperature environments like industrial power supplies and automotive modules. ## What the voltage ratings mean for your rail The 43.6V reverse standoff is the maximum DC voltage the TVS can sit across without conducting — design it on a 36V or 42V bus with margin. Breakdown starts at 48.5V min, and clamping at 70.1V max limits the transient voltage seen by the downstream circuitry. With a 1500W peak pulse rating, this part handles substantial surge energy; the 21.4A peak pulse current at the 10/1000µs waveform gives a quick check against expected transient currents. ## Lifecycle reality – obsolete, no direct successor onsemi has marked the 1.5KE51ARL4 as Obsolete. No official successor part is listed in the product documentation.","metaTitle":"1.5KE51ARL4 onsemi Zener TVS – Obsolete","metaDescription":"onsemi 1.5KE51ARL4 Zener TVS, 1500W peak pulse, 43.6V standoff, DO-201AD axial. Now obsolete – find replacement guidance and sourcing options here.","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)":"48.5V","Voltage - Clamping (Max) @ Ipp":"70.1V","Voltage - Reverse Standoff (Typ)":"43.6V","Current - Peak Pulse (10/1000µs)":"21.4A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/717ad1fc0ab391931f54c66e75e89e87.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I source the 1.5KE51ARL4 or find a replacement?","answer":"The 1.5KE51ARL4 is obsolete per onsemi. We can source remaining inventory from our supply network — submit an RFQ with your target quantity and we will check availability and pricing. For a drop-in replacement, the 1.5KE51A (same DO-201AD package, same electrical specs) is a direct alternative; confirm the reel packaging suffix matches your assembly needs."},{"question":"Is 1.5KE51ARL4 a suitable replacement for 1.5KE51A?","answer":"Yes, the 1.5KE51ARL4 and 1.5KE51A share the same breakdown voltage (48.5V min), clamping voltage (70.1V max), and standoff voltage (43.6V) in the DO-201AD package. The RL4 suffix on the ARL4 variant indicates tape-and-reel packaging; the 1.5KE51A may be offered in bulk or different reel formats. Functionally they are interchangeable for the protection window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/1.5KE51ARL4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/1.5KE51ARL4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:12:52.393Z","lastPublished":"2026-07-17T20:12:52.393Z","indexable":true}}