{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE43C-B","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE43C-B","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE43C-B","factsUrl":"https://icboms.com/api/mcp/products/1.5KE43C-B","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5KE series Zener TVS diode, 1.5KE43C-B, 1500W peak pulse power, 36.8V reverse standoff, 62.27V clamping, 25.6A peak pulse current, bidirectional, DO-201AA/DO-27 axial package, bulk.","salesMarkdown":"## Obsolete — sourcing path for sustainment Littelfuse has marked the 1.5KE43C-B as obsolete. No last-time-buy window remains open. ## Zener TVS parametrics — what the ratings mean for the board The 36.8 V reverse standoff voltage is the maximum DC or AC peak voltage the protected line can carry without the device conducting — above that, breakdown begins at 38.75 V minimum. Clamping is specified at 62.27 V maximum when the device conducts 25.6 A of peak pulse current. This clamping voltage is the upper bound the downstream circuitry must survive; a 48 V bus or 36 V rail with a 20 % tolerance stays below the standoff threshold. ## Package and board-fit — DO-201 axial leaded Housed in the DO-201AA / DO-27 axial-lead package, with the supplier device package designated DO-201. Through-hole mounting — the axial leads insert into plated through-holes and are wave-soldered or hand-soldered on the opposite side. The bidirectional configuration uses a single device to clamp both positive and negative transients, saving board space versus two unidirectional diodes back-to-back. No power line protection feature is built in — this is a general-purpose transient suppressor, not a rail-clamp array.","metaTitle":"Littelfuse 1.5KE43C-B Zener TVS, 1500W, 36.8V Standoff","metaDescription":"Littelfuse 1.5KE43C-B obsolete Zener TVS diode, 1500W peak pulse, 36.8V 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","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-201","Voltage - Breakdown (Min)":"38.75V","Voltage - Clamping (Max) @ Ipp":"62.27V","Voltage - Reverse Standoff (Typ)":"36.8V","Current - Peak Pulse (10/1000µs)":"25.6A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"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 the 1.5KE43C-B?","answer":"The 1.5KE series includes many bidirectional Zener TVS diodes in the same DO-201 package with different standoff voltages — a parametric search by standoff (36.8 V) and peak pulse power (1500 W) may identify a still-active sibling, but no direct replacement is documented."},{"question":"What is the 1.5KE43C-B's type and series?","answer":"The device type is Zener, part of the Littelfuse 1.5KE series. It is a bidirectional TVS diode, meaning a single component clamps transients of either polarity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE43C-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/1.5KE43C-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}}