{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N6278HE3/73","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1N6278HE3-73","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1N6278HE3-73","factsUrl":"https://icboms.com/api/mcp/products/1N6278HE3%2F73","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor Diodes Division, 1N6278HE3/73, Automotive AEC-Q101 TransZorb® TVS Zener, 1.5 kW peak pulse, 16.2 V standoff, 29.1 V clamping, 51.5 A peak pulse, DO-201AA axial through-hole, tape-and-box.","salesMarkdown":"The 1N6278HE3/73 is a unidirectional TransZorb® — Vishay's TVS variant of a Zener diode — qualified to AEC-Q101 for automotive environments. It clamps transient voltage at 29.1 V maximum when conducting a 51.5 A peak pulse (10/1000 µs waveform), while the reverse standoff sits at 16.2 V typical — that 2.3× separation gives the 12 V rail enough headroom to pass normal operation while clamping inductive load dumps and load-switching transients. Peak pulse power is rated at 1500 W (1.5 kW) — this is the clamped energy the device safely dissipates during the transient event, not a continuous rating. The Tj max of 175 °C junction temperature gives substantial thermal margin for engine-bay and under-hood deployments where ambient can run high. ## Lifecycle and sourcing reality — the part is officially obsolete No L* successor, no parametric cross-reference, and no documented replacement in this series — a board spin may be required to migrate to a newer TVS family if remaining stocks run out. The part ships tape-and-box (TB) in the DO-201AA (DO-27) axial through-hole package — the same industry-standard outline as the 1.5KE series supplier device package designation, which is how Vishay references this form factor. Through-hole mounting ties it to a legacy PCB footprint — confirm the hole pattern before specifying a replacement. ## Deployment context — where this class of part protects automotive circuits AEC-Q101 qualification means the die and package passed temperature cycling, mechanical shock, and humidity-biased life tests specific to automotive grade. The -55 to 175 °C junction temperature window covers cold-start to full-load thermal extremes in an engine-compartment environment. The TransZorb® function is unclamped inductive energy absorption — protecting downstream ECUs and sensors on 12 V supply rails from voltage spikes that exceed the semiconductor breakdown threshold.","metaTitle":"Vishay 1N6278HE3/73 TVS Diode, 1.5kW, AEC-Q101","metaDescription":"Obsolete Vishay 1N6278HE3/73 TransZorb® TVS Zener, AEC-Q101, 1.5kW peak pulse, 29.1V clamping — sourced to order via RFQ through independent channels.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Vishay General Semiconductor - Diodes Division","Type":"Zener","Series":"Automotive, AEC-Q101, TransZorb®","Package":"Tape & Box (TB)","Applications":"Automotive","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Obsolete","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)":"18V","Voltage - Clamping (Max) @ Ipp":"29.1V","Voltage - Reverse Standoff (Typ)":"16.2V","Current - Peak Pulse (10/1000µs)":"51.5A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1N6278HE3%2F73/alternatives.json"},"ai":{"faq":[{"question":"What does the TransZorb® series designation mean, and is there a direct replacement?","answer":"TransZorb® is Vishay's trademark for their transient voltage suppressor Zener — a unidirectional clamping diode designed to absorb energy during short-duration overvoltage events."},{"question":"What is 1N6278HE3/73 used for in an automotive system?","answer":"It clamps inductive transients on a 12 V supply rail — protecting downstream ECUs, sensors, and control modules from voltage spikes that exceed the 16.2 V standoff rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1N6278HE3-73","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/1N6278HE3-73 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T16:48:12.014Z","lastPublished":"2026-07-22T16:48:12.014Z","indexable":true}}