{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE300A","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE300A","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE300A","factsUrl":"https://icboms.com/api/mcp/products/1.5KE300A","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE300A, 1500W peak pulse power, 256V reverse standoff, 414V clamping, DO-201AA axial, through-hole, unidirectional.","salesMarkdown":"## 1500W peak pulse, 256V standoff — the surge protection ceiling The 1.5KE300A is a 1500W Zener TVS diode from Littelfuse's 1.5KE series, designed to clamp transients on DC rails up to 256V reverse standoff. This is a unidirectional device — one diode per package, cathode band marked. It's meant for DC bus protection where the rail stays positive relative to ground; for AC or bidirectional clamping you'd need two in series or the bidirectional variant. ## DO-201 axial package and thermal range Housed in a DO-201AA / DO-27 axial leaded package, also referred to as DO-201 supplier package. The through-hole body handles the 1500W pulse without the thermal constraints of a surface-mount package — the leads conduct heat into the PCB copper and the air around the body. Junction temperature range spans -55°C to 175°C, which covers both cold-start industrial environments and hot engine-bay or power-supply compartments. No power line protection feature — this is a standalone transient suppressor, not a filtered TVS array. ## What the ratings mean for your rail The 285V minimum breakdown is where it starts to avalanche; the 414V clamp is where the voltage is held during the surge. If your downstream circuitry can't survive 414V for the 10/1000µs pulse duration, you need a lower-voltage TVS or a secondary clamp.","metaTitle":"Littelfuse 1.5KE300A TVS Diode, 1500W, 256V Standoff, DO-201","metaDescription":"Littelfuse 1.5KE300A Zener TVS diode, 1500W peak pulse power, 256V reverse standoff, 414V clamping at 3.7A. DO-201 axial package.","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)":"285V","Voltage - Clamping (Max) @ Ipp":"414V","Voltage - Reverse Standoff (Typ)":"256V","Current - Peak Pulse (10/1000µs)":"3.7A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.2800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1ea870152ad203d90f672f2af1c1ed0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1.5KE300A?","answer":"Any 1500W axial-lead Zener TVS diode in a DO-201 package with a 256V reverse standoff and similar breakdown/clamp voltages will be a functional drop-in. Vishay's P6KE300A (600W) is lower power; their 1.5KE300A equivalent shares the same DO-201 footprint and parametric window. ON Semiconductor's 1N6275A series also covers this range. The Littelfuse 1.5KE300A is the original reference; cross-references are common in this mature TVS class."},{"question":"What compliance documentation does Littelfuse provide for 1.5KE300A?","answer":"Littelfuse provides RoHS and REACH compliance declarations for the 1.5KE series. The DO-201 package is lead-free and halogen-free per standard industry requirements. UL recognition and IEC 61000-4-5 surge test data are available in the datasheet. No specific military or AEC-Q qualification is listed for this part, though the -55°C to 175°C temperature range suits many industrial and automotive under-hood applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE300A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE300A 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}}