{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE440ARL","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE440ARL","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE440ARL","factsUrl":"https://icboms.com/api/mcp/products/1.5KE440ARL","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE440ARL Zener, Series 1.5KE TRANSIL™, 1500W Peak Pulse, 376V Standoff, 418V Breakdown, 776V Clamp, DO-201AA Axial, Through Hole.","salesMarkdown":"## What this Zener does on the board The STMicroelectronics 1.5KE440ARL is a 1500W peak pulse power Zener transient voltage suppressor from the 1.5KE TRANSIL™ series, designed to clamp overvoltage transients on AC or DC power rails. The through-hole DO-201AA axial package suits point-to-point wiring or PCB mounting with a traditional leaded footprint. The clamping voltage hits 776V at the peak current of 13A (8/20 µs waveform), so the downstream circuitry needs to survive that clamp level. The 418V minimum breakdown voltage gives a guard band above the 376V standoff, meaning the part stays out of conduction during normal line ripple. ST continues to manufacture the 1.5KE series, and this variant remains a standard catalog item. ## Capacitance and signal considerations The 360 pF capacitance at 1 MHz is typical for a 1500W-class Zener in this voltage range. On a 376V power rail that capacitance is negligible, but if the suppressor is placed on a data or communication line (e.g., a 376V-powered RS-485 bus), the added load can round off fast edges. For pure power-rail clamping, it is not a concern.","metaTitle":"STMicroelectronics 1.5KE440ARL Zener, 1500W Peak Pulse","metaDescription":"STMicroelectronics 1.5KE440ARL Zener transient suppressor, 1500W peak pulse power, 376V standoff, 418V breakdown, DO-201 axial.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"1.5KE, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","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":"1.5KE440","Operating Temperature":"-","Power Line Protection":"No","Capacitance @ Frequency":"360pF @ 1MHz","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"418V","Voltage - Clamping (Max) @ Ipp":"776V","Voltage - Reverse Standoff (Typ)":"376V","Current - Peak Pulse (10/1000µs)":"13A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6225","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/572f99690aeb2b0f302ed9cdcfd976ec.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE440ARL/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1.5KE440ARL in this component family?","answer":"Within the 1.5KE TRANSIL™ series, the 1.5KE440A (without the R suffix for tape-and-reel packaging) is electrically identical — same 376V standoff, 418V breakdown, and 1500W rating — and shares the same DO-201 footprint. The difference is only the reel packaging format, not the silicon or the clamping performance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE440ARL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE440ARL when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}