{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6278A-E3/54","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1N6278A-E3-54","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1N6278A-E3-54","factsUrl":"https://icboms.com/api/mcp/products/1N6278A-E3%2F54","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor, TransZorb® series, unidirectional Zener TVS, 1.5 kW peak pulse, 17.1 V standoff / 19 V breakdown / 27.7 V clamping, 54.2 A peak pulse, DO-201AA axial, -55°C to 175°C junction.","salesMarkdown":"The 1N6278A-E3/54: The 1.5 kW peak pulse rating (10/1000 µs waveform) defines the device's ability to absorb a single high-energy transient — a lightning surge, inductive kick, or switching spike — without degrading. That 54.2 A peak pulse current at 27.7 V clamping voltage is the clamping ceiling under the standard IEC 61000-4-5 test wave. The actual let-through voltage seen by the protected load stays at or below 27.7 V as long as the event energy stays within the 1.5 kW rating window. Exceed it and the part goes into conduction collapse. The 17.1 V reverse standoff typ and 19 V minimum breakdown define the normal operating band — the TVS sits idle below 17.1 V and begins to avalanche above 19 V. For a 24 V nominal rail, the standoff margin is tight enough to need careful derating: a 10 % rail variation puts 26.4 V on the line, leaving barely 2.6 V before the breakdown threshold. Verify the worst-case rail sits comfortably below the standoff ceiling for reliable idle operation. ## Junction temperature and deployment context The -55°C to 175°C junction temperature range places this part in the high-reliability and industrial grade band. The upper limit is governed by the silicon junction, not the housing — the DO-201AA body dissipates heat through the leads into the PCB pad and surrounding copper. In a still-air enclosed panel, budget the thermal path from lead to ambient to confirm the junction stays below 175°C under continuous standby at the reverse standoff voltage. As a through-hole axial part in the DO-201AA package, this TVS is wave-soldered or hand-soldered during board assembly — not a hot-air reflow part. The 1.5KE device package designation in the supplier listing ties directly to the 1.5 kW peak pulse power class, which is the key sizing parameter when selecting a replacement across the 1.5KE family.","metaTitle":"1N6278A-E3/54 Zener TVS Diode, 1500W Peak Pulse","metaDescription":"Vishay 1N6278A-E3/54 TransZorb Zener, 1500W peak pulse, 27.7V clamping @ 54.2A (10/1000µs). 19V min breakdown, 17.1V standoff. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Vishay General Semiconductor - Diodes Division","Type":"Zener","Series":"TransZorb®","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Active","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1N6278","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"19V","Voltage - Clamping (Max) @ Ipp":"27.7V","Voltage - Reverse Standoff (Typ)":"17.1V","Current - Peak Pulse (10/1000µs)":"54.2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3246","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6278A-E3%2F54/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 1N6278A-/54 and how do I get a price?","answer":"This part is sourced to order against an RFQ through our independent distribution network."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1N6278A-E3-54","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay-general-semiconductor-diodes-division/1N6278A-E3-54 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}