{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC91CAHE3/9AT","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5SMC91CAHE3-9AT","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC91CAHE3-9AT","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC91CAHE3%2F9AT","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division 1.5SMC91CAHE3/9AT, Zener bidirectional TVS diode, AEC-Q101 1.5SMC/TransZorb series, 77.8V standoff, 125V clamping, 1.5kW peak pulse, DO-214AB SMC surface mount, -65°C to 150°C.","salesMarkdown":"The 1.5SMC91CAHE3/9AT: The 1.5SMC series is Vishay's mid-range automotive Transient Voltage Suppressor line, sitting between the smaller 1.5KE family and the higher-power 5KP series. At 1.5 kW, it handles the load-dump and inductive-spike transients common in 12 V and 24 V automotive rails without requiring a larger, more expensive device. The peak pulse current of 12 A at 10/1000 µs is the other half of the absorption story — the clamping voltage of 125 V is specified at this current. Design to that clamping level, not the standoff voltage, when you are protecting a downstream IC. The clamp voltage is where the protected rail gets pushed during the event. ## The three-voltage window: standoff, breakdown, clamping The reverse standoff voltage of 77.8 V typical is the working rail the TVS sees continuously — the device sits reverse-biased at this level without conducting. The minimum breakdown of 86.5 V is where it starts to avalanche and clamp. A downstream IC must survive 125 V at the input for the duration of the event — if its abs-max is below that, add a series resistor or use a lower-voltage standoff part. This is a bidirectional device — a single Zener channel handles both polarities. For a single-polarity supply rail, the CAH variant is the right choice; the polarity matters at the board layout level because the cathode ties to the rail to be protected and the anode grounds. ## AEC-Q101 and the automotive deployment envelope The AEC-Q101 qualification means the part has passed the automotive stress tests — temperature cycling, humidity bias, and surge life — at the component level. For under-hood deployments the junction temperature rating of 150 °C maximum gives you headroom against the 125 °C ambient that a board in an engine bay can see. The lower bound of -65 °C covers cold-start conditions in non-heated compartments. ## DO-214AB SMC footprint and surface-mount handling The DO-214AB (SMC) package is the industry-standard TVS footprint — two pads, gull-wing leads, compatible with standard pick-and-place. The supplier device package field lists the older SMCJ designation, which is the same body; both names appear in the datasheet depending on revision year. Thermal pad handling matters: the cathode pad is the heat sink — it needs sufficient copper area on the PCB to stay below the 150 °C junction limit at the expected average power. The part ships on Tape & Reel, which is the standard orientation for automotive assembly. The CAH polarity marking on the reel label is the only orientation indicator — there is no polarity stripe as in through-hole glass TVS. Confirm the cathode band is correctly oriented before placement if the reel label is ambiguous. ## Active lifecycle — BOM-safe production status The base product number 1.5SMC91 belongs to a long-running series, so second-source options from other Vishay-compatible manufacturers exist in the same DO-214AB footprint. Confirm the peak pulse waveform and clamping spec match across any alternate source before swapping, because the 10/1000 µs test condition is not universal across TVS families.","metaTitle":"Vishay 1.5SMC91CAHE3/9AT, 125V Clamping, 1.5kW TVS Diode","metaDescription":"Vishay 1.5SMC91CAHE3/9AT bidirectional TVS diode, AEC-Q101 qualified, 125V clamping, 77.8V standoff, 1.5kW peak pulse at DO-214AB SMC. Active production.","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":"Automotive, AEC-Q101, 1.5SMC, TransZorb®","Package":"Tape & Reel (TR)","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","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","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AB (SMCJ)","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/de7dd597f6fdc3f56660f78f3e5a960d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMC91CAHE3%2F9AT/alternatives.json"},"ai":{"faq":[{"question":"What does bidirectional mean for this TVS diode — do I need two devices?","answer":"No. A single 1.5SMC91CAHE3/9AT handles both polarities through one Zener channel. For a supply rail that swings both above and below ground — such as an AC-coupled signal or a bipolar power rail — the CAH variant covers both directions. For a single-polarity DC rail, you still use one device with cathode to the positive rail and anode to ground."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5SMC91CAHE3-9AT","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/1.5SMC91CAHE3-9AT 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}}