{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE91C-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE91C-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE91C-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE91C-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS, bidirectional, 1.5KE91C-B, 1500W peak pulse power, 77.8V reverse standoff, DO-201AA axial through-hole, bulk.","salesMarkdown":"## Protection window — breakdown, clamping, and standoff voltages The 1.5KE91C-B: The 77.8 V standoff means the protected line can ride at that DC or peak AC voltage without the TVS conducting leakage current — the clamping triggers only when the transient exceeds the breakdown threshold. ## Bidirectional configuration and application fit A single bidirectional channel protects signal lines that swing both positive and negative relative to ground — common in AC-coupled data interfaces, RS-485 transceivers, and audio paths where polarity is not fixed. The DO-201AA (DO-27) axial leaded package mounts through-hole on a PCB or terminal block, suited for bulkhead or panel-mounted protection modules where surface-mount reflow is not available. Power line protection is not listed — this device is intended for data, signal, or general-purpose secondary surge suppression, not for direct AC mains clamping.","metaTitle":"Littelfuse 1.5KE91C-B TVS, 1500W, 77.8V Standoff","metaDescription":"Obsolete Littelfuse 1.5KE91C-B bidirectional Zener TVS, 1500W peak pulse, 77.8V standoff, DO-201. Sourced to order against RFQ through independent channels.","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)":"81.9V","Voltage - Clamping (Max) @ Ipp":"131.25V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12.2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/149eca2cbf10498ecc0c7eab912fe9f4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1.5KE91C-B in this Circuit Protection family?","answer":"The 1.5KE series includes many bidirectional Zener TVS parts in the same DO-201 package; a parametric search for a bidirectional TVS with a similar standoff voltage (77.8 V) and 1500 W peak pulse power will yield functional equivalents, but pinout and footprint are identical across the axial-leaded DO-201 family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE91C-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/1.5KE91C-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}}