{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE39-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE39-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE39-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE39-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE39-B, 1500W peak pulse power, 33.3V reverse standoff, 56.6V clamping, DO-201AA axial, through hole, bulk.","salesMarkdown":"## What the 1500 W rating means for your rail The 1.5KE39-B: At 28.2 A peak pulse current (10/1000 µs waveform), the clamping voltage holds at 56.6 V max — this is the voltage the downstream components must survive without latch-up or oxide rupture. The 33.3 V reverse standoff voltage means it sits across a 24 V or 28 V supply without conducting in normal operation; the breakdown threshold starts at 35.15 V min. A 12 V rail is too low — the diode would sit in partial conduction and overheat. ## Obsolete — sourcing reality for the 1.5KE39-B Sourcing this part means going through independent surplus or broker inventory. The DO-201 axial package and 1500 W rating are common across the 1.5KE family, but each voltage variant is a distinct die — a 33.3 V standoff part cannot be substituted with a different voltage code. Date-code and lot traceability are verified before shipment. ## Package and thermal integration Housed in a DO-201AA (DO-27) axial-lead package with a DO-201 supplier device code, the 1.5KE39-B mounts through-hole. The 1500 W peak pulse rating assumes the leads are soldered into a PCB with adequate copper pad area to sink heat during the transient event. The wide range means the clamping voltage and leakage current shift with temperature — at 175°C, leakage rises significantly, so the steady-state rail voltage must stay well below the 33.3 V standoff to avoid thermal runaway.","metaTitle":"1.5KE39-B Littelfuse TVS Diode, 1500W, 33.3V Standoff","metaDescription":"Littelfuse 1.5KE39-B Zener TVS diode, 1500W peak pulse, 33.3V reverse standoff, DO-201 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5KE","Package":"Bulk","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Obsolete","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)":"35.15V","Voltage - Clamping (Max) @ Ipp":"56.6V","Voltage - Reverse Standoff (Typ)":"33.3V","Current - Peak Pulse (10/1000µs)":"28.2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How do I get current pricing and availability for 1.5KE39-B?","answer":"Submit an RFQ through this listing. No stock-holding claim is made — availability varies by lot."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE39-B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE39-B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}