{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE39A","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE39A","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE39A","factsUrl":"https://icboms.com/api/mcp/products/1.5KE39A","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE Series Zener TVS Diode, 1.5KE39A, 1500W Peak Pulse Power, 33.3V Reverse Standoff, 53.9V Clamping, DO-201AA Axial, Through Hole, Active.","salesMarkdown":"## 1500 W surge clamp for 33 V rails The 1.5KE39A: The 33.3 V reverse standoff voltage means it sits across a 33 V DC rail and draws no leakage until a transient pushes above the minimum breakdown of 37.1 V. When it fires, the clamp holds at 53.9 V maximum while passing 28.2 A of peak pulse current — enough margin to protect a 60 V-rated downstream IC or MOSFET from inductive kickback or surge coupling. The single unidirectional channel means the cathode band (the marked end) connects to the positive rail being protected; the anode goes to ground. Reversing it turns the diode into a forward-biased rectifier that conducts at ~0.7 V and does nothing useful for the transient. ## DO-201 axial — thermal pulse handling The DO-201AA / DO-27 axial-lead package (supplier device package DO-201) is a through-hole body with thick copper leads that sink the thermal energy of a 1500 W surge better than an equivalent SMD package. The junction temperature range spans -55°C to 175°C, covering military, automotive under-hood, and outdoor telecom cabinet environments without derating. The 'Power Line Protection = No' flag in the spec is a reminder that this is a data-line or DC-rail TVS, not designed for AC mains or direct lightning strike on outdoor power feeds. It handles IEC 61000-4-5 surge levels on signal and low-power supply lines but not the energy of a primary-side MOV. ## Active production — no obsolescence concern No NRND, no EOL notice, no last-time-buy window. This is a current catalog item available through authorized distribution and independent channels — no need to stockpile or search for a replacement on a new BOM. Littelfuse is one of the original manufacturers with a long production history. The base product number 1.5KE and the 1.5KE series designation mean the same die and package are used across multiple voltage variants; the 39A suffix specifies the 39 V breakdown grade (unidirectional).","metaTitle":"Littelfuse 1.5KE39A TVS Diode, 1500W, DO-201, 33.3V Standoff","metaDescription":"Active Littelfuse 1.5KE39A Zener TVS diode, 1500W peak pulse, 33.3V standoff, 53.9V clamp, DO-201AA axial package. -55°C to 175°C. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5KE","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":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"37.1V","Voltage - Clamping (Max) @ Ipp":"53.9V","Voltage - Reverse Standoff (Typ)":"33.3V","Current - Peak Pulse (10/1000µs)":"28.2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1ea870152ad203d90f672f2af1c1ed0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the 1.5KE39A used for?","answer":"Typical applications include protecting downstream silicon (MOSFETs, controllers, sensors) from inductive kickback, load-dump surges, and coupled transients on signal or low-power supply lines in industrial, automotive, and telecom equipment."},{"question":"What are the key clamping specs for the 1.5KE39A?","answer":"The reverse standoff voltage is 33.3 V, meaning it sits across a 33 V rail without conducting. Breakdown starts at 37.1 V minimum. The peak pulse power rating is 1500 W for a 10/1000 µs waveform."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE39A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE39A 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}}