{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC91A-E3/9AT","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5SMC91A-E3-9AT","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC91A-E3-9AT","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC91A-E3%2F9AT","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor, 1.5SMC91A-/9AT, unidirectional Zener TVS diode, 77.8 V standoff, 125 V clamping @ 12 A, 1500 W peak pulse, DO-214AB (SMC), surface mount, -65°C to 150°C TJ.","salesMarkdown":"## What the clamping spec means for your rail The 1.5SMC91A-E3/9AT: The 125 V clamping voltage at 12 A peak pulse (10/1000 µs) is the number that decides whether the downstream circuit survives the surge — the standoff of 77.8 V sets the working rail it watches without clipping during normal operation, and the 1500 W peak-pulse rating tells you the energy it can absorb in that event before the Zener regime takes over. For a 77 V rail with a 1.5 kV surge injection, the diode clamps at 125 V and the 12 A peak current flows through the TVS rather than the protected rail. ## Unidirectional, single-channel — polarity matters on the board One unidirectional channel means the TVS clamps only transients of one polarity — on a positive-going supply rail the cathode connects to the protected node and the anode to ground. The DO-214AB (SMC) footprint is a standard surface-mount land pattern; the tape-and-reel packaging suits high-volume placement on an automated line. ## Wide junction temperature and what it signals about storage The wide TJ range does indicate the die and epoxy system are qualified for elevated-ambient environments, but the storage floor life comes from the MSL rating not present in this listing. That makes it a stable BOM line: the part is not going NRND on you without warning, and there is no official last-time-buy window to chase.","metaTitle":"Vishay 1.5SMC91A-E3/9AT TVS Diode, 77.8V standoff, 1500W","metaDescription":"Vishay 1.5SMC91A-E3/9AT unidirectional Zener TVS diode, 77.8 V standoff, 125 V clamping, 1500 W peak pulse. Active — quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Vishay General Semiconductor - Diodes Division","Type":"Zener","Series":"1.5SMC, TransZorb®","Package":"Tape & Reel (TR)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5SMC91","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AB (SMCJ)","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":"$0.2266","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/de7dd597f6fdc3f56660f78f3e5a960d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMC91A-E3%2F9AT/alternatives.json"},"ai":{"faq":[{"question":"What does the 77.8 V reverse standoff voltage actually protect?","answer":"77.8 V is the working DC voltage the TVS watches without conducting — it sits above the nominal rail it protects and below the breakdown threshold. The part breaks down at a minimum of 86.5 V, clamping at 125 V when a surge pushes the current to 12 A. So it protects rails nominally rated up to the mid-60s volts, which covers 48 V industrial, 54 V telecom, and many 24–36 V automotive signal rails."},{"question":"Is this a power-line protection part?","answer":"No — the listing explicitly flags Power Line Protection as No. This is a board-level signal or DC-rail clamp, not an AC mains protector. For a power-line application you would look at a different Vishay series with the appropriate peak surge current and thermal cycling rating for line-frequency exposure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC91A-E3-9AT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC91A-E3-9AT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}