{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE91A/54","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE91A-54","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91A-54","factsUrl":"https://icboms.com/api/mcp/products/1.5KE91A%2F54","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division TransZorb® TVS, Type Zener, 1.5KE91A/54, 1500W peak pulse, 77.8V standoff, 125V clamping, DO-201AA axial, Tape & Reel.","salesMarkdown":"The 1.5KE91A/54: Its lifecycle status is Obsolete — the manufacturer no longer produces this exact order code, so any BOM line using it needs a sourcing plan through independent channels. The DO-201AA (DO-27) axial-lead package is a through-hole form factor that reworks cleanly under a hot-air station — the leads take solder well and the body markings are legible after removal, which matters for board repair and rework scenarios. ## Key ratings and what drives the fit The 77.8 V reverse standoff voltage (working voltage) means this diode will not conduct at normal rail levels up to that point — it sits across the line as a high-impedance shunt until a transient exceeds the breakdown threshold. ## Sourcing an obsolete TVS diode Since the 1.5KE91A/54 is marked Obsolete by Vishay, new-stock is sourced through independent surplus and broker channels — each lot is verified for authenticity and tested to the original datasheet parameters before shipment. No official successor order code is recorded on this line — a functional replacement would need to match the 77.8 V standoff, 1500 W pulse rating, and DO-201AA footprint, but no pin-compatible direct substitute is documented here.","metaTitle":"1.5KE91A/54 Vishay TransZorb TVS, 1500W, 77.8V Standoff","metaDescription":"Obsolete Vishay 1.5KE91A/54 TransZorb TVS diode, 1500W peak pulse, 77.8V standoff, DO-201AA. Sourced to order against 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":"TransZorb®","Package":"Tape & Reel (TR)","Applications":"General Purpose","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":"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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91A-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-54 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}