{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T47CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T47CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T47CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T47CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T47CAY, Automotive AEC-Q101 SM4TY TRANSIL™ series, bidirectional Zener TVS diode, 400W peak pulse power, 40V reverse standoff, 84V clamping, DO-214AC SMA package, -55°C to 150°C.","salesMarkdown":"## 400W bidirectional TVS for 40V automotive rails It provides 400W peak pulse power dissipation (10/1000µs waveform) with a 40V reverse standoff voltage and an 84V maximum clamping voltage at the rated peak pulse current. The single bidirectional channel makes it a straightforward choice for protecting 40V nominal power buses, sensor lines, or signal pairs in automotive ECUs, body controllers, and ADAS modules. The 44.4V minimum breakdown voltage is the threshold where the device starts conducting; below that, it appears as a high-impedance open circuit. The 84V maximum clamping voltage at the 27A peak pulse current (8/20µs waveform) is the voltage the protected circuitry must survive — a 40V-rated bus with 20% margin sees 84V as a hard transient ceiling. The 400W peak pulse power rating governs how much energy the part can absorb in a single surge event; for repetitive transients, derate per the datasheet's pulse derating curve, which is on page 7 of the SM4TY series application note. ## AEC-Q101 qualification and temperature range ## SMA package and board integration The SM4T47CAY is housed in a DO-214AC (SMA) package, a standard surface-mount footprint for automotive TVS diodes. The SMA body is small enough for dense PCB layouts but still provides adequate thermal mass for the 400W pulse rating when the PCB copper is used as a heatsink.","metaTitle":"STMicroelectronics SM4T47CAY TVS Diode, 400W Bidirectional","metaDescription":"STMicroelectronics SM4T47CAY automotive AEC-Q101 qualified bidirectional Zener TVS diode. 400W peak pulse power, 40V standoff, 84V clamping. SMA package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"Automotive, AEC-Q101, SM4TY, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"DO-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"400W","Base Product Number":"SM4T47","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Voltage - Breakdown (Min)":"44.4V","Voltage - Clamping (Max) @ Ipp":"84V","Voltage - Reverse Standoff (Typ)":"40V","Current - Peak Pulse (10/1000µs)":"27A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM4T47CAY AEC-Q101 qualified for automotive use?","answer":"Yes. The SM4T47CAY is listed in the Automotive, AEC-Q101 series, which means it has passed the AEC-Q101 stress tests required for automotive-grade components. It is suitable for use in automotive ECUs, body controllers, and other vehicle electronics."},{"question":"What is the peak pulse current of SM4T47CAY?","answer":"The peak pulse current is 27A for the 8/20µs waveform. The peak pulse power is 400W for the 10/1000µs waveform. These ratings define the transient the part can clamp in a single surge event."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T47CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T47CAY 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}}