{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE91CA-E3/51","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE91CA-E3-51","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91CA-E3-51","factsUrl":"https://icboms.com/api/mcp/products/1.5KE91CA-E3%2F51","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division TransZorb® TVS Diode, 1.5KE91CA-/51, 1500W Peak Pulse, 77.8V Standoff, 125V Clamp, Bidirectional, DO-201AA Axial, Bulk.","salesMarkdown":"## Last-Buy Status and Sourcing Reality The 1.5KE91CA-E3/51: Vishay has marked the 1.5KE91CA-/51 as Last Buy — the manufacturer's last-time-buy window is active, meaning this part is not for new designs and will not be available through the factory channel after the LTB closes. No stock-holding claim — each lot is verified for authenticity and RoHS compliance before shipment. ## Protection Parametrics — What the Ratings Mean for the Board The 12 A peak pulse current (Ipp) at the same waveform tells you the surge the diode can clamp without failing. Clamping voltage is 125 V max at Ipp — the voltage the protected rail sees during the surge. With a reverse standoff of 77.8 V, this part sits on a nominal 75 V or 80 V DC bus and holds off normal operating voltage without leakage. Breakdown voltage (minimum 86.5 V) is the threshold where the diode starts conducting — it guarantees the rail is protected before the voltage reaches the clamping level. ## Bidirectional Channel and Package Fit Single bidirectional channel — the same device clamps both polarities, so it works on AC signal lines or bipolar DC rails without needing two diodes back-to-back. Through-hole DO-201AA (DO-27) axial package — the body is 1.5KE size, suited for point-to-point wiring or PCB through-hole mounting. Bulk packaging means loose tubes or bag, not tape-and-reel.","metaTitle":"1.5KE91CA-E3/51 Vishay TVS, 1500W Bidirectional, DO-201AA","metaDescription":"Vishay 1.5KE91CA-E3/51 TransZorb® TVS, 1500W peak pulse, 77.8V standoff, 125V clamp, bidirectional, DO-201AA. Last Buy — sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Vishay General Semiconductor - Diodes Division","Type":"Zener","Series":"TransZorb®","Package":"Bulk","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Last Time Buy","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","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","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":"$0.8847","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1.5KE91CA-/51?","answer":"For a new design, consider the current-production TransZorb series with the same package and voltage class — confirm the standoff and clamping values match your rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE91CA-E3-51","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/1.5KE91CA-E3-51 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}}