{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE24","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE24","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE24","factsUrl":"https://icboms.com/api/mcp/products/1.5KE24","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE24, 1500W peak pulse power, 20.5V reverse standoff, 34.86V clamping, DO-201AA axial, through hole.","salesMarkdown":"## What the 1500W rating means on a dead rail The 1.5KE24: When a surge hits, the diode breaks down at 21.6V minimum and clamps the voltage to 34.86V maximum while shunting up to 45.8A of peak pulse current (10/1000µs waveform). That 1500W peak pulse power rating tells you it can absorb a single high-energy event — like an inductive kick or a lightning-induced spike — without failing short. The through-hole axial body (DO-201) makes it a common sight on older industrial control boards and telecom line cards, where a technician can spot the scorch mark and know which part actually died. The operating junction temperature range from -55°C to 175°C covers most environments outside of engine-bay extremes. ## Sourcing an obsolete part for a board repair Littelfuse has marked the 1.5KE24 as obsolete, meaning the manufacturer no longer produces it. For a repair bench or a BOM that needs this exact order code, the supply channel is independent distribution — surplus inventory, new-old-stock, or broker-sourced lots. No official successor order code is listed by Littelfuse for this part. If the board layout allows, a functionally equivalent TVS with similar standoff and clamping voltages from the same 1.5KE family could be considered, but a pin-compatible drop-in is not guaranteed without reviewing the full datasheet. ## Key specs for the BOM check The reverse standoff voltage is 20.5V — this is the DC bias the diode sees under normal operation without conducting. The breakdown range starts at 21.6V, so the rail must stay below that threshold during steady-state. The clamping voltage at peak pulse current is 34.86V, which sets the maximum voltage the downstream circuitry sees during a transient event. It is a single unidirectional channel, meaning it protects one polarity. The package is DO-201AA axial (also known as DO-27), with a through-hole mount — the leads are crimped into the PCB and soldered, making it straightforward to replace with a soldering iron and a desoldering wick.","metaTitle":"Littelfuse 1.5KE24 TVS Diode, 1500W, 20.5V Standoff","metaDescription":"Obsolete Littelfuse 1.5KE24 Zener TVS diode, 1500W peak pulse, 20.5V reverse standoff, DO-201 axial. Sourced to order against RFQ.","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":"Tape & Reel (TR)","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)":"21.6V","Voltage - Clamping (Max) @ Ipp":"34.86V","Voltage - Reverse Standoff (Typ)":"20.5V","Current - Peak Pulse (10/1000µs)":"45.8A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6835","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1ea870152ad203d90f672f2af1c1ed0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the 1.5KE24 used for?","answer":"It is a Zener TVS diode that protects a 20.5V DC rail from voltage transients by clamping surges up to 1500W peak pulse power. Common on industrial control boards, telecom equipment, and power supply outputs where a single unidirectional clamp is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE24","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE24 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}}