{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE540A-E3/51","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE540A-E3-51","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE540A-E3-51","factsUrl":"https://icboms.com/api/mcp/products/1.5KE540A-E3%2F51","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division TransZorb® TVS, Type Zener, 1.5KE540A-/51, 1500W peak pulse, 459V standoff, 740V clamping, DO-201AA/DO-27 Axial, Through Hole, Bulk.","salesMarkdown":"## Last-buy status — what it means for your BOM The 1.5KE540A-E3/51: The 1.5KE540A-/51 carries a Last Buy lifecycle status from Vishay. This means the manufacturer has announced end-of-life and is accepting final orders within a defined window — after which the part will no longer be manufactured. For a BOM line using this TVS, the decision is whether to secure last-time-buy inventory for the remaining production run or to qualify a replacement. A replacement search should target a TVS with the same package (DO-201AA / DO-27 axial), a reverse standoff voltage of 459 V, and a peak pulse power rating of 1500 W — the same parametric envelope as this TransZorb device. ## Clamping voltage and protection threshold The reverse standoff voltage is 459 V typical, meaning the TVS draws negligible leakage current below this rail voltage. Above 459 V, the device begins to avalanche; the minimum breakdown voltage is 513 V, which is the guaranteed turn-on threshold. A 480 VAC or 400 VDC bus sits safely below the standoff, but a 500 V rail would keep the TVS in continuous breakdown — not a valid application. ## Peak pulse power and thermal capability The 2.03 A peak pulse current at the clamping voltage confirms the power rating — the product of Ipp and Vclamp equals the 1.5 kW rating within the waveform's duration. The operating junction temperature range spans -55°C to +175°C, which covers industrial and some automotive under-hood environments. Power derating applies above 25°C — at 175°C the peak pulse power capability drops to near zero, so the thermal environment of the board must be considered for repetitive transient exposure. ## Package and board integration Housed in a DO-201AA / DO-27 axial-lead package, the 1.5KE540A-/51 is a through-hole device intended for hand-insertion or wave-solder assembly. The axial leads require hole diameters sized per the lead cross-section — typically 1.0 mm to 1.2 mm finished hole — and the body must be spaced off the board to allow airflow and avoid heat transfer during soldering. Supplied in bulk packaging, not tape-and-reel. This suits low-volume production, prototyping, or repair stock, but a high-volume pick-and-place line would need a different packaging option or a reel-compatible alternative from the same TransZorb family.","metaTitle":"1.5KE540A-E3/51 Vishay TransZorb TVS, 1.5kW, 459V Standoff","metaDescription":"Vishay 1.5KE540A-E3/51 TransZorb TVS diode, 1500W peak pulse power, 459V reverse standoff, 740V clamping. Last-buy status — sourced to order. Request a quote.","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":"1.5KE540","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"513V","Voltage - Clamping (Max) @ Ipp":"740V","Voltage - Reverse Standoff (Typ)":"459V","Current - Peak Pulse (10/1000µs)":"2.03A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0992","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 1.5KE540A-/51 and get a price?","answer":"No stock-holding claim is made on this page."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE540A-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/1.5KE540A-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}}