{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC91AT3G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5SMC91AT3G","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5SMC91AT3G","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC91AT3G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse 1.5SMC91AT3G, Zener TVS diode, unidirectional 1-channel, 1500W peak pulse, 86.5V min breakdown, 125V clamping @ 12A, -65°C to 150°C TJ, DO-214AB SMC, surface mount.","salesMarkdown":"## 1.5SMC91AT3G — what it is and where it sits The 1.5SMC91AT3G is a unidirectional Zener-based transient voltage suppressor in the DO-214AB (SMC) package, rated for surface-mount assembly. ## Surge clamping capability — what 125V clamping means for the design The maximum clamping voltage of 125 V at a peak pulse current of 12 A (10/1000 µs) sets the let-through voltage the downstream circuit must survive when a surge arrives. At 12 A the device clamps cleanly within that ceiling; the minimum breakdown of 86.5 V defines the point at which conduction begins, so the protection window between standoff (77.8 V typ) and clamping (125 V max) is the margin the board designer evaluates against the transient threat level. For a board running near the upper end of that band, the clamping voltage spec still applies at rated peak current; derating for continuous thermal conditions is a layout question, not a spec sheet gap. ## Lifecycle — what obsolete means for your BOM No L* cross-reference, no second-source designation — the BOM line needs a sourcing plan, not a reorder confirmation. For new designs this part is not a viable first choice; for legacy boards under repair or MRO re-supply the window for last-time-buy is already closed through authorized channels. Independent distribution and surplus traders are the remaining route — availability is lot-specific and lot traceability is not guaranteed through the manufacturer. Confirm the datasheet revision and lead-free / RoHS status against the board's certification requirements before committing to any independent-source stock.","metaTitle":"1.5SMC91AT3G Littelfuse TVS Diode, 125V Clamping, DO-214AB","metaDescription":"Obsolete Littelfuse 1.5SMC91AT3G unidirectional TVS Zener, 1500W peak pulse, 125V clamping @ 12A, DO-214AB SMC. Sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5SMC","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Obsolete","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5SMC","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"86.5V","Voltage - Clamping (Max) @ Ipp":"125V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ea97bb520e37528ab309c554c0bb147d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMC91AT3G/alternatives.json"},"ai":{"faq":[{"question":"What part replaces the 1.5SMC91AT3G?","answer":"The 1.5SMC series family may have a functional equivalent in the same DO-214AB SMC package at a similar voltage — a parametric search across the series with 86.5 V minimum breakdown as the floor will surface candidates, but any substitute requires board-level fit verification before BOM commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5SMC91AT3G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5SMC91AT3G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-14T23:42:47.998Z","lastPublished":"2026-09-14T23:42:47.998Z","indexable":true}}