{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC91C","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5SMC91C","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5SMC91C","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC91C","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse 1.5SMC91C Zener TVS, 1.5 kW peak pulse, 77.8V standoff, 131.25V clamping @ 12.2A, DO-214AB SMC, -55°C to 150°C junction, surface mount.","salesMarkdown":"## Clamping and standoff — what the numbers mean for the protected rail The 1.5SMC91C: The reverse standoff of 77.8 V sets the continuous working voltage the TVS sees in normal operation — above this the device begins to conduct and clamp. For a 77.8 V rail that needs headroom to 131.25 V, the protected node sees a voltage ratio of roughly 1.69× during the event — a meaningful let-through for sensitive downstream stages that need tighter budgets, so confirm the downstream absolute-maximum rating clears 131.25 V before committing this part to the design. The 1.5 kW peak-pulse rating defines the energy the device can absorb once per the 10/1000 µs surge waveform — this is the Littelfuse 1.5SMC series transient-surge capability, appropriate for industrial AC mains protection and secondary clamp roles where the energy window is well-defined. ## Junction temperature and the -55 to 150 °C window Rated to 150 °C junction, the 1.5SMC91C sits in the upper tier of the 1.5SMC family thermal range. The -55 °C cold start matters for outdoor and equipment-bay deployments where the TVS sees startup transients before the enclosure warms — a cold-clamped surge behaves differently from one at elevated ambient, and the wide window gives margin for both cases. ## Sourcing an obsolete Littelfuse 1.5SMC part The 1.5SMC91C carries an Obsolete product status — Littelfuse has formally discontinued this order code. No authorized stock remains through the regular distribution channel; independent and surplus sources hold what is available, and lot provenance matters more than it does for an active line. Quote through an RFQ to confirm genuine date-code stock before scheduling a build — a TVS that has sat unprogrammed in a warehouse for years after the last-time-buy window may have been subjected to uncontrolled storage conditions that degrade the junction characteristics.","metaTitle":"Littelfuse 1.5SMC91C TVS Diode, 131.25V Clamping","metaDescription":"Littelfuse 1.5SMC91C Zener TVS, 1500W peak pulse, 77.8V standoff, 131.25V clamping. Obsolete — sourced to order via independent distribution.","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)","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":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AB (SMCJ)","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/118f1b70ec0f0941665a20e5472af60a.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMC91C/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5SMC91C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5SMC91C when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T21:15:07.288Z","lastPublished":"2026-07-21T21:15:07.288Z","indexable":true}}