{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T10CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T10CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T10CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T10CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T10CAY, Automotive, AEC-Q101, SM4TY, TRANSIL™, Zener, 400W, 8.5V standoff, 19.5V clamping, DO-214AC SMA, -55°C~150°C.","salesMarkdown":"The STMicroelectronics SM4T10CAY is a bidirectional Zener TVS diode from the SM4TY TRANSIL™ series, rated for 400W peak pulse power (10/1000µs waveform). It clamps at 19.5V maximum and has an 8.5V reverse standoff voltage, making it a common choice for protecting 12V automotive electronics from load-dump and inductive surge events. The 400W peak pulse power rating (10/1000µs) translates to a 124A peak pulse current capability at the 8/20µs waveform. For a 12V automotive system, the 8.5V standoff means the diode stays out of conduction during normal battery voltage swings (up to 16V during charge), but clamps hard at 19.5V when a transient hits. That clamping voltage is low enough to protect downstream ECUs and sensors without triggering a crowbar or blowing a fuse. ## DO-214AC SMA — rework and assembly notes For rework, the SMA body is small enough that a hot-air station at 300°C with a fine nozzle lifts the part cleanly without overheating the board.","metaTitle":"STMicroelectronics SM4T10CAY TVS Diode, 400W, DO-214AC","metaDescription":"Automotive-grade bidirectional TVS diode, 400W peak pulse power, 8.5V standoff, DO-214AC SMA package. AEC-Q101 qualified. Available to order.","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":"SM4T10","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)":"9.4V","Voltage - Clamping (Max) @ Ipp":"19.5V","Voltage - Reverse Standoff (Typ)":"8.5V","Current - Peak Pulse (10/1000µs)":"124A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM4T10CAY suitable for 12V automotive systems?","answer":"Yes. The 8.5V reverse standoff voltage and 19.5V clamping voltage are well matched to 12V automotive rails. The AEC-Q101 qualification and -55°C to 150°C temperature range cover under-hood and chassis environments."},{"question":"Can SM4T10CAY replace SM4T10A?","answer":"The SM4T10CAY is the bidirectional version of the SM4T10A unidirectional part. Both share the same 400W rating, 8.5V standoff, and DO-214AC package. If your circuit requires bidirectional clamping (no polarity sensitivity), the SM4T10CAY is a drop-in replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T10CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T10CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:19:42.160Z","lastPublished":"2026-07-16T15:19:42.160Z","indexable":true}}