{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE250A","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE250A","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE250A","factsUrl":"https://icboms.com/api/mcp/products/1.5KE250A","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE250A TRANSIL™ TVS diode, unidirectional, 1500W peak pulse power, 237V breakdown voltage, 442V clamping, DO-201AA axial package.","salesMarkdown":"## Transient protection for 213V rails The STMicroelectronics 1.5KE250A is a unidirectional TRANSIL™ TVS diode from the 1.5KE series, designed to clamp transients on DC power rails and signal lines in general-purpose industrial and telecom equipment. It delivers 1500W peak pulse power per the 10/1000µs waveform, with a reverse standoff voltage of 213V and a minimum breakdown voltage of 237V. The clamping voltage is held to 442V at the peak pulse current of 23A (8/20µs waveform). This part is through-hole mounted in a DO-201AA (DO-27) axial-lead package, suited for board-level surge protection where a single unidirectional device protects one polarity rail. The 237V minimum breakdown voltage is the threshold where the device starts to avalanche; the 442V clamping voltage at 23A peak pulse current is the maximum voltage the protected circuit sees during a transient event. A downstream component rated for at least 442V is needed to survive the clamp. The 1500W peak pulse power rating (10/1000µs) gives the energy-handling capability for a single surge — derate for repetitive events or higher ambient temperatures. The unidirectional channel means this device protects one polarity; for AC or bidirectional lines, the 1.5KE250CA (bidirectional variant) would be the correct choice.","metaTitle":"1.5KE250A TRANSIL TVS Diode, 1500W, 237V Breakdown, DO-201","metaDescription":"1.5KE250A is a 1500W unidirectional TVS diode from STMicroelectronics, 237V breakdown, 442V clamping.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"1.5KE, TRANSIL™","Package":"Cut Tape (CT); Tape & Box (TB)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE250","Operating Temperature":"-","Power Line Protection":"No","Capacitance @ Frequency":"560pF @ 1MHz","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"237V","Voltage - Clamping (Max) @ Ipp":"442V","Voltage - Reverse Standoff (Typ)":"213V","Current - Peak Pulse (10/1000µs)":"23A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/572f99690aeb2b0f302ed9cdcfd976ec.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE250A/alternatives.json"},"ai":{"faq":[{"question":"Is 1.5KE250A unidirectional or bidirectional?","answer":"The 1.5KE250A is a unidirectional TVS diode, with one channel protecting a single polarity rail. For bidirectional protection on AC or symmetric lines, the 1.5KE250CA is the bidirectional counterpart in the same series."},{"question":"What is the difference between 1.5KE250A and 1.5KE250CA?","answer":"The 1.5KE250A is unidirectional, protecting one polarity. The 1.5KE250CA is bidirectional, clamping transients of both polarities, which is needed for AC lines or where the protected signal swings through zero. Both share the same 213V standoff, 237V breakdown, 442V clamping, and 1500W peak pulse power ratings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE250A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE250A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:08.974Z","lastPublished":"2026-07-16T15:42:08.974Z","indexable":true}}