{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC9.1A-E3/9AT","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5SMC9.1A-E3-9AT","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC9.1A-E3-9AT","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC9.1A-E3%2F9AT","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor, 1.5SMC9.1A-/9AT, unidirectional Zener (TransZorb®) TVS diode, 1500W peak pulse, 7.78V standoff, 8.65V minimum breakdown, 13.4V clamping, 112A peak pulse, DO-214AB (SMC) surface mount, tape and reel.","salesMarkdown":"## What the 1.5SMC9.1A does on a protected rail The 1.5SMC9.1A-E3/9AT: The 1.5SMC9.1A-/9AT is a unidirectional transient voltage suppressor — a Zener-type clamping device that sits reverse-biased across a supply rail and does nothing until a voltage spike exceeds its breakdown threshold. The standoff rating of 7.78 V defines the normal operating window; the part stays off at that voltage and only conducts when the transient pushes it above 8.65 V minimum breakdown. When it clamps, it limits the peak at 13.4 V maximum — so downstream semiconductor gets a defined, survivable overvoltage event instead of an open-ended spike. The 1.5 kW peak pulse rating is quoted at the industry-standard 10/1000 µs waveform — a slow rising, relatively long-duration surge typical of inductive kick and power-bus disturbance, not the very fast ESD event. That distinction matters: this part is sized for power-supply rail clamping, not for USB or GPIO ESD paths where the rise time is orders of magnitude faster. The corresponding peak pulse current is 112 A at that waveform, which is what the clamping voltage actually looks like in terms of current handling. ## DO-214AB package and board-level integration The DO-214AB (SMC) package is the mid-power TVS footprint — larger than the SMA (DO-214AC) used for lower-power parts and smaller than the SMCJ (DO-214AA) used at higher stand-off voltages. The cathode bar is the anode electrically; the body marking identifies the polarity end. Because this is a surface-mount part with a thermal pad under the body, reflow profile and pad design determine the thermal impedance to the board — keep the land pads to the datasheet footprint and avoid voiding under the die attach. ## Temperature grade and shelf-life considerations Rated junction temperature runs to 150 °C with a -65 °C low end — that wide range covers automotive under-hood and industrial outdoor enclosures without derating concerns in most PCB environments. The part ships tape-and-reel; confirm the reel diameter and moisture-sensitivity level from the datasheet before leaving it on a shelf in a humid climate — SMCJ-class packages typically carry MSL 1, but verify before reflowing a part that has been stored longer than its floor life. The 1.5SMC series carries the TransZorb® trademark — Vishay's original bi-directional TVS structure, though this specific unidirectional variant uses only the forward-direction clamping characteristic. General-purpose applications span power supplies, motor drives, and industrial control rails where the unidirectional polarity is unambiguous and the 1.5 kW rating provides adequate headroom over the transient exposure.","metaTitle":"Vishay 1.5SMC9.1A-E3/9AT TVS Diode, 1.5kW 13.4V DO-214AB","metaDescription":"Vishay 1.5SMC9.1A-E3/9AT unidirectional TVS diode, 1500W peak pulse at 10/1000µs, 7.78V standoff / 8.65V breakdown / 13.4V clamping. Active. Available 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":"1.5SMC9.1","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)":"8.65V","Voltage - Clamping (Max) @ Ipp":"13.4V","Voltage - Reverse Standoff (Typ)":"7.78V","Current - Peak Pulse (10/1000µs)":"112A"}},"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/1.5SMC9.1A-E3%2F9AT/alternatives.json"},"ai":{"faq":[{"question":"What voltage does the 1.5SMC9.1A-/9AT actually clamp at?","answer":"The part activates above 8.65 V minimum breakdown and clamps the peak at 13.4 V maximum at the rated 112 A pulse current. During normal operation it sits off at 7.78 V standoff — a protected rail at 5 V or 12 V nominal sees no conduction until a transient exceeds the breakdown threshold."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC9.1A-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/1.5SMC9.1A-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}}