{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE91A-E3/54","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE91A-E3-54","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91A-E3-54","factsUrl":"https://icboms.com/api/mcp/products/1.5KE91A-E3%2F54","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division TransZorb® TVS, 1.5KE91A-/54, 1500W peak pulse, 77.8V reverse standoff, 86.5V breakdown, 125V clamping, DO-201AA axial.","salesMarkdown":"## 1500 W peak pulse, 77.8 V standoff — the TransZorb TVS for 72–90 V rail protection The 1.5KE91A-E3/54: Clamping at 125 V max, it sinks 12 A of peak pulse current — sized to protect 72–90 V DC rails in telecom, industrial, and aerospace power buses where a single surge event must not propagate upstream. ## Breakdown margin and clamping ceiling The 86.5 V min breakdown sits 8.7 V above the 77.8 V standoff — a 1.11× ratio that keeps the diode off during normal rail ripple while firing fast on an overvoltage event. The 125 V clamp ceiling at 12 A means the downstream converter sees a peak well under its 150–200 V input rating, giving margin for repetitive surge stress. Operating junction temperature spans -55 to +175 °C — the full military temperature grade. In an unpressurised avionics bay or a telecom outdoor cabinet cycling from -40 to +85 °C ambient, the junction stays within safe derating. ## DO-201AA axial lead — board-fit and procurement notes Through-hole DO-201AA (DO-27) package, axial leads. The 1.5KE body diameter and lead spacing are standard for 1.5 kW TVS — fits existing PCB layouts for the 1.5KE family without a footprint change. Supplied on tape-and-reel for automated insertion, or cut tape for prototype builds.","metaTitle":"1.5KE91A-E3/54 Vishay TVS, 1500W, 77.8V Standoff","metaDescription":"Active Vishay 1.5KE91A-E3/54 TransZorb TVS — 1500W peak pulse, 77.8V reverse standoff, 86.5V breakdown, -55 to +175°C. Sourced per RFQ.","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":"1.5KE91","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"86.5V","Voltage - Clamping (Max) @ Ipp":"125V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6400","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is 1.5KE91A-/54's listed type and series?","answer":"The device is a Zener-type TVS (unidirectional, 1 channel) in the TransZorb series from Vishay. The TransZorb designation covers the 1.5KE family's silicon-avalanche transient suppressors with 1500 W peak pulse capability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91A-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/1.5KE91A-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}}