{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE550C-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE550C-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE550C-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE550C-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE550C-B, 1500W peak pulse, 495V breakdown, 798V clamping, bidirectional, DO-201AA axial, bulk.","salesMarkdown":"## What the 1500W rating means for the protection threshold The 1.5KE550C-B: The 495V minimum breakdown voltage and 798V maximum clamping define the transient it can absorb — a 2A peak pulse current at that waveform. For a 480VAC line or a 400VDC bus, this part clamps before the downstream silicon sees destructive overvoltage, but the 495V standoff means it does not conduct during normal rail ripple. The bidirectional channel handles both positive and negative transients in a single DO-201AA axial package, saving board space over two unidirectional devices. ## Obsolete — sourcing through surplus and last-time-buy channels Littelfuse has marked the 1.5KE550C-B as obsolete. For a BOM that already carries this part number, the procurement decision is whether the remaining stock in the channel covers the production run or whether a board spin to a current TVS family is more cost-effective. The DO-201 footprint is still common, but the 495V breakdown point is specific — a parametric substitute would need matching standoff and clamping within the same axial package. Through-hole DO-201AA axial package, also listed as DO-27. The leads are tin-plated copper, sized for solder or socket insertion into a 1.0 mm to 1.3 mm plated-through hole. The body length is about 9.1 mm, and the lead diameter is 1.3 mm — standard for this power class. Bulk packaging means the parts ship loose in a bag, not taped and reeled.","metaTitle":"Littelfuse 1.5KE550C-B TVS Diode, 1500W, 495V, DO-201","metaDescription":"Littelfuse 1.5KE550C-B Zener TVS, 1500W peak pulse, 495V breakdown, 798V clamping. Obsolete — sourced to order. RFQ for availability.","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","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-201","Voltage - Breakdown (Min)":"495V","Voltage - Clamping (Max) @ Ipp":"798V","Voltage - Reverse Standoff (Typ)":"495V","Current - Peak Pulse (10/1000µs)":"2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key ratings for the 1.5KE550C-B?","answer":"Bidirectional, single channel. Operating junction temperature range is -55°C to 175°C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE550C-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/1.5KE550C-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}}