{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMC91CAHR7G","brand":"Taiwan Semiconductor Corporation","brandSlug":"taiwan-semiconductor-corporation","productSlug":"1.5SMC91CAHR7G","canonicalUrl":"https://icboms.com/taiwan-semiconductor-corporation/1.5SMC91CAHR7G","factsUrl":"https://icboms.com/api/mcp/products/1.5SMC91CAHR7G","rawCanonicalId":null},"summary":{"shortDescription":"Taiwan Semiconductor Corporation 1.5SMC91CAHR7G, Automotive Zener (TVS), 1.5kW peak pulse, 77.8V standoff, 125V clamping, 12.6A peak pulse, AEC-Q101, DO-214AB SMC, Surface Mount, Tape & Reel.","salesMarkdown":"## What the 1.5SMC91CAHR7G is and why it matters The 1.5SMC91CAHR7G is an Automotive-grade bidirectional TVS (transient voltage suppressor), qualified to AEC-Q101. The CA suffix designates bidirectional polarity — it clamps both positive and negative transients, making it a solid fit for unprotected nodes on 12V and 24V automotive rails where the reversal of inductive kickback or a negative-going load-dump spike is a real threat. ## The clamping stack — standoff, breakdown, and the peak pulse number The reverse standoff voltage is 77.8 V typ: the TVS looks invisible to the line at normal operating voltage. When a transient pushes the node above 86.5 V minimum breakdown, the device avalanches and clamps. Working through the math: at 12.6 A the device dissipates roughly 1.6 kW for the duration of the event — that is what the 1.5 kW rating is sized to survive without destruction. For automotive load-dump protection the clamping voltage is the number that matters most — it must stay below the absolute-max rating of whatever IC sits behind it. At 125 V max clamping the 1.5SMC91CA is not protecting a 3.3 V rail; it is positioned for nodes that see higher working voltages or need the headroom of a 78 V standoff class. ## Automotive temperature grade and thermal margin Junction temperature is rated to 150 °C, which is the upper bound for most AEC-Q101 qualified TVS parts — it gives real margin against the thermal soak an under-hood ECU enclosure can produce without active cooling. The thermal resistance junction-to-lead and junction-to-ambient values in the datasheet determine whether the board-level pad and copper fill actually deliver on that 150 °C promise, so check the derating curve before locking in a thermal layout. AEC-Q101 qualification means the part has passed the temperature cycling, humidity bias, and surge stress screens defined in the automotive electronics council stress test qualification — the kind of screening that matters when the board lives under the bonnet rather than in a temperature-controlled rack.","metaTitle":"1.5SMC91CAHR7G — 1.5kW TVS Diode, 77.8V Standoff, AEC-Q101","metaDescription":"AEC-Q101 qualified 1.5kW TVS diode, 77.8V standoff / 86.5V breakdown / 125V clamping. Bidirectional, DO-214AB SMC. Active production — quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Taiwan Semiconductor Corporation","Type":"Zener","Grade":"Automotive","Series":"1.5SMC","Package":"Tape & Reel (TR)","Applications":"-","Mounting Type":"Surface Mount","Qualification":"AEC-Q101","Package / Case":"DO-214AB, SMC","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5SMC91","Operating Temperature":"-55°C ~ 150°C (TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AB (SMC)","Voltage - Breakdown (Min)":"86.5V","Voltage - Clamping (Max) @ Ipp":"125V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12.6A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMC91CAHR7G/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between this part and the 1.5SMC91A variant?","answer":"The CA suffix indicates bidirectional polarity; the A suffix on the base part number 1.5SMC91 typically designates the unidirectional version. Both share the same 77.8 V standoff, 86.5 V breakdown, and 125 V clamping spec, but the bidirectional CA variant clamps both polarities — important for nodes that see negative transients as well as positive."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/taiwan-semiconductor-corporation/1.5SMC91CAHR7G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/taiwan-semiconductor-corporation/1.5SMC91CAHR7G 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}}