{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE56ARL","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE56ARL","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE56ARL","factsUrl":"https://icboms.com/api/mcp/products/1.5KE56ARL","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE56ARL, 1.5KE series TRANSIL™ Zener TVS diode, 1500W peak pulse power, 47.8V standoff, 53.2V breakdown, 100V clamping, DO-201AA/DO-27 axial through-hole.","salesMarkdown":"## Transient suppressor for 48 V rails — what the ratings mean The STMicroelectronics 1.5KE56ARL is a unidirectional Zener transient voltage suppressor from the 1.5KE TRANSIL™ family, designed to clamp overvoltage events on general-purpose DC power and signal lines. Its 47.8 V reverse standoff voltage sits just below the nominal 48 V telecom and industrial bus levels, so it stays out of conduction during normal operation. Breakdown is guaranteed at 53.2 V minimum, and the clamping voltage is held to 100 V at the peak pulse current of 100 A (8/20 µs waveform). With a peak pulse power rating of 1500 W, this part handles substantial surge energy in a through-hole DO-201 axial package — a common footprint for board-level protection in power supplies, motor drives, and base stations. ## Obsolete — sourcing the 1.5KE56ARL today STMicroelectronics no longer manufactures this exact suffix variant. For a BOM line that still specifies this order code, the supply channel is independent distribution — stock is sourced from excess inventory, last-time-buy remnants, and verified broker inventory. ## Design-in note: capacitance and unidirectional use The 1.5KE56ARL is a single unidirectional channel — it clamps positive transients only; for bidirectional protection on AC or bipolar rails, two devices or a bidirectional variant is needed. Capacitance is 1800 pF at 1 MHz.","metaTitle":"1.5KE56ARL Zener TVS Diode, 1500W, DO-201, Obsolete","metaDescription":"STMicroelectronics 1.5KE56ARL Zener TVS diode, 1500W peak pulse power, 53.2V breakdown, 100V 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":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE","Operating Temperature":"-","Power Line Protection":"No","Capacitance @ Frequency":"1800pF @ 1MHz","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"53.2V","Voltage - Clamping (Max) @ Ipp":"100V","Voltage - Reverse Standoff (Typ)":"47.8V","Current - Peak Pulse (10/1000µs)":"100A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/572f99690aeb2b0f302ed9cdcfd976ec.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE56ARL/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for 1.5KE56ARL?","answer":"The base part 1.5KE56A (without the 'RL' tape-and-reel suffix) is electrically identical — same 47.8 V standoff, 53.2 V breakdown, 100 V clamping, and 1500 W rating — and may still be available through franchised channels in tube or bulk packaging. For a drop-in replacement with the same DO-201 footprint, any 1500 W TVS with a 47 V to 48 V standoff and unidirectional polarity from the 1.5KE family (e.g., 1.5KE56A) will fit. Cross-reference to other manufacturers' 1.5KE56A parts should be verified for clamping voltage and pulse current ratings."},{"question":"1.5KE56ARL vs 1.5KE56A — what's the difference?","answer":"The 1.5KE56A ships in bulk or tube. The electrical specifications — 47.8 V standoff, 53.2 V breakdown, 100 V clamping, 1500 W peak pulse power — are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE56ARL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE56ARL when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:49:31.543Z","lastPublished":"2026-07-16T14:49:31.543Z","indexable":true}}