{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE18CARL","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE18CARL","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE18CARL","factsUrl":"https://icboms.com/api/mcp/products/1.5KE18CARL","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE18CARL, TRANSIL™ series, Zener diode, 1500W (1.5kW) peak pulse power, bidirectional, 17.1V breakdown min, 32.5V clamping max, DO-201AA/DO-27 axial package, through-hole mount.","salesMarkdown":"## What this Zener is and what it protects The STMicroelectronics 1.5KE18CARL is a 1500W bidirectional Zener diode from the TRANSIL™ series, housed in a DO-201 axial-lead package. It is designed for general-purpose transient overvoltage suppression where a symmetric clamping characteristic is needed — the single bidirectional channel clamps both polarities of a surge without needing two diodes back-to-back. The reverse standoff voltage is 15.3V, meaning the device does not conduct appreciably below that level — it stays off the rail during normal operation. Breakdown starts at a minimum of 17.1V, and the clamping voltage is held to a maximum of 32.5V at the peak pulse current of 308A (8/20µs waveform). For a 15V nominal DC bus, this device provides a protection window that triggers before most downstream silicon ratings are exceeded, while the 1500W pulse capability handles heavy surge events from inductive loads or lightning-coupled transients. ## Capacitance — a constraint for signal-line use The capacitance is specified at 2150pF at 1MHz. This part is best suited for power-supply rails, relay coils, or DC bus protection where signal integrity is not a concern. STMicroelectronics no longer manufactures this specific order code in volume.","metaTitle":"STMicroelectronics 1.5KE18CARL Zener, 1500W, Bidirectional","metaDescription":"STMicroelectronics 1.5KE18CARL Zener diode, 1500W peak pulse power, bidirectional, 17.1V breakdown min, DO-201 package.","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)","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","Bidirectional Channels":"1","Capacitance @ Frequency":"2150pF @ 1MHz","Supplier Device Package":"DO-201","Voltage - Breakdown (Min)":"17.1V","Voltage - Clamping (Max) @ Ipp":"32.5V","Voltage - Reverse Standoff (Typ)":"15.3V","Current - Peak Pulse (10/1000µs)":"308A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/572f99690aeb2b0f302ed9cdcfd976ec.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE18CARL/alternatives.json"},"ai":{"faq":[{"question":"Is 1.5KE18CARL still available to buy?","answer":"The 1.5KE18CARL is listed as Obsolete by STMicroelectronics, but it remains available through independent distribution."},{"question":"What is the replacement for 1.5KE18CARL?","answer":"A functionally equivalent drop-in from the same TRANSIL™ 1.5KE series — such as the 1.5KE18CA (bidirectional, DO-201, 1500W, same voltage ratings) — should be evaluated for new designs or as a BOM alternate. Verify the exact breakdown and clamping specifications against your protection requirement."},{"question":"Is 1.5KE18CARL bidirectional?","answer":"Yes, it is a single bidirectional channel — it clamps both positive and negative transients symmetrically, which is useful for AC lines or DC rails where the surge polarity is unknown."},{"question":"What is the capacitance of 1.5KE18CARL?","answer":"The capacitance is 2150pF measured at 1MHz. This is relatively high and makes the part unsuitable for high-speed signal-line protection — it is intended for power rails and DC bus applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE18CARL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE18CARL when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:36:51.532Z","lastPublished":"2026-07-16T14:36:51.532Z","indexable":true}}