{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6278ARL4","brand":"onsemi","brandSlug":"onsemi","productSlug":"1N6278ARL4","canonicalUrl":"https://icboms.com/onsemi/1N6278ARL4","factsUrl":"https://icboms.com/api/mcp/products/1N6278ARL4","rawCanonicalId":null},"summary":{"shortDescription":"onsemi Mosorb™ series, Zener TVS, 1500W peak pulse power, 17.1V reverse standoff, 27.7V clamping, DO-201AD axial through-hole, tape & reel.","salesMarkdown":"## 1500W peak pulse power in a DO-201AD axial package The 1N6278ARL4 is a unidirectional Zener TVS from onsemi's Mosorb™ family, rated for 1500W peak pulse power at 10/1000 µs waveform. That 1.5 kW rating means it can absorb a substantial transient — think inductive load dump or lightning surge on a 12V/24V rail — without failing short. The DO-201AD axial body handles the thermal pulse; the leaded package is a through-hole part, so it's a natural fit for point-of-entry protection on a PCB where the transient energy is highest. ## Clamping voltage and standoff — the protection window Reverse standoff is 17.1V typical; the device starts conducting at 19V breakdown minimum. Maximum clamping at rated Ipp is 27.7V. That 10.6V window between standoff and clamp is tight enough to protect a 24V nominal bus — the downstream DC-DC or load switch sees a peak well below its 30V absolute max. No power line protection feature is built in; this is a straight Zener clamp, no crowbar or foldback. ## Obsolete — what that means for your BOM onsemi lists the 1N6278ARL4 as Obsolete. The Mosorb™ series has been widely replaced by newer TVS families (e.g., SMCJ, SMDJ) in surface-mount packages, but those are not pin-compatible with the DO-201AD axial footprint. For an existing board using this part, the practical path is to source remaining inventory through distribution or the open market — we can quote to order against your BOM quantity. ## Temperature range and environment The junction temperature range spans -65°C to 175°C, which covers military and industrial extremes. The DO-201AD axial package is rated for through-hole mounting — the leaded body dissipates heat into the PCB copper and surrounding air.","metaTitle":"1N6278ARL4 onsemi Mosorb™ Zener TVS – 1500W, DO-201AD","metaDescription":"1N6278ARL4 onsemi Mosorb™ Zener TVS, 1500W peak pulse power, 17.1V standoff, 27.7V clamp, DO-201AD axial. Obsolete – source via RFQ.","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":"1N6278","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)":"-"}},"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 order the 1N6278ARL4 or check stock?","answer":"The 1N6278ARL4 is obsolete, so it is not in regular production. We can source it from our supply network and quote to order against your BOM quantity. Submit an RFQ with your target volume and we will confirm availability and current pricing."},{"question":"What is the replacement for the 1N6278ARL4?","answer":"onsemi does not list a direct replacement for the 1N6278ARL4. The Mosorb™ series is discontinued; newer TVS families like the SMCJ series offer similar 1500W peak pulse power but in a surface-mount DO-214AB package, which is not pin-compatible with the DO-201AD axial footprint. For an existing design, you may need to qualify a different package or source remaining stock."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/1N6278ARL4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/1N6278ARL4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:13:31.734Z","lastPublished":"2026-07-17T20:13:31.734Z","indexable":true}}