{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE51-E3/73","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE51-E3-73","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE51-E3-73","factsUrl":"https://icboms.com/api/mcp/products/1.5KE51-E3%2F73","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor TransZorb® series, Zener TVS diode, 1.5KE51-/73, 1500W peak pulse power, 41.3V reverse standoff, 73.5V clamping, DO-201AA axial, unidirectional.","salesMarkdown":"## EOL — last-time-buy window closed The 1.5KE51-E3/73: Vishay lists the 1.5KE51-/73 as obsolete. For a BOM line still calling out this part, the sourcing path is broker or surplus stock with date-code provenance verified at RFQ. No pin-compatible replacement from Vishay is documented. ## 1500 W peak pulse — what the rating governs The clamping voltage at that peak current is 73.5 V max. Reverse standoff voltage is 41.3 V typical — the rail or signal line should stay below this level during normal operation. Breakdown occurs at a minimum of 45.9 V, giving roughly 4.6 V of guard band before the diode starts conducting. Peak pulse current is 20.4 A at the 10/1000 µs pulse. That figure sets the fuse-coordination floor: the TVS must clamp before the upstream fuse or breaker clears, so the I²t of the pulse stays inside the diode's SOA. ## Unidirectional, through-hole, general-purpose Single unidirectional channel — one diode per package, cathode banded. For bidirectional clamping on an AC signal pair, two devices or a bidirectional part are needed. DO-201AA (DO-27) axial leaded package, through-hole mount. The 0.042-inch lead diameter fits standard 1.0 mm PCB holes; the body length is roughly 9.1 mm. The 175°C TJ(max) is typical for silicon TVS diodes and allows the junction to absorb repetitive pulses without immediate failure, provided the average power stays within the derating curve.","metaTitle":"1.5KE51-E3/73 TransZorb TVS, 1500W, 41.3V Standoff","metaDescription":"Obsolete Vishay 1.5KE51-E3/73 unidirectional Zener TVS diode, 1500W peak pulse, 73.5V clamp. Sourced to order against RFQ through independent distribution.","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 & Box (TB)","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":"1.5KE51","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"45.9V","Voltage - Clamping (Max) @ Ipp":"73.5V","Voltage - Reverse Standoff (Typ)":"41.3V","Current - Peak Pulse (10/1000µs)":"20.4A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative in this Circuit Protection family?","answer":"The functional replacement requires a part with the same package (DO-201AA), similar standoff voltage (~41 V), and equal or higher peak pulse power (≥1500 W)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE51-E3-73","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/1.5KE51-E3-73 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}