{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T14CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T14CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T14CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T14CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T14CAY, Automotive AEC-Q101 TRANSIL™ bidirectional TVS diode, 12V reverse standoff, 25.3V clamp, 400W peak pulse power, DO-214AC SMA package.","salesMarkdown":"## 12V automotive rail protection — the SM4T14CAY The STMicroelectronics SM4T14CAY is a bidirectional TRANSIL™ TVS diode qualified to AEC-Q101. It clamps overvoltage spikes on 12V DC power rails in automotive electronic modules. The reverse standoff voltage is 12V, meaning the diode will not conduct appreciably below that rail voltage — it stays invisible to the 12V bus during normal operation. Breakdown occurs at a minimum of 13.3V, and the clamping voltage at the peak pulse current of 91A (8/20 µs waveform) is 25.3V. That 25.3V clamp is what the downstream circuitry must survive; if the protected IC's absolute-maximum input is, say, 30V, there is margin. Housed in a DO-214AC (SMA) surface-mount package, the SM4T14CAY shares the same footprint as many other SMA-packaged TVS diodes. The wide temperature range also suits outdoor telecom and industrial 12V rails that see thermal cycling. For production BOMs, this means no immediate obsolescence risk. For dual-sourcing resilience, the SM4T14 series includes multiple voltage variants sharing the same SMA footprint, but within the 12V bidirectional option the SM4T14CAY is the standard order code.","metaTitle":"STMicroelectronics SM4T14CAY TVS Diode, AEC-Q101, 400W","metaDescription":"Bidirectional TVS diode, 12V standoff, 25.3V clamp at 91A, 400W peak pulse. AEC-Q101 qualified for automotive 12V systems. SMA package. Active lifecycle.","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":"SM4T14","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)":"13.3V","Voltage - Clamping (Max) @ Ipp":"25.3V","Voltage - Reverse Standoff (Typ)":"12V","Current - Peak Pulse (10/1000µs)":"91A (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 SM4T14CAY automotive grade?","answer":"Yes, the SM4T14CAY is part of the Automotive SM4TY series and is qualified to AEC-Q101, the stress-test qualification standard for discrete semiconductors used in automotive applications. This means it has passed the required reliability tests for under-hood and cabin electronics."},{"question":"What is the difference between SM4T14CAY and SM4T14AY?","answer":"The 'C' in SM4T14CAY denotes a bidirectional device — it clamps both positive and negative transients with a single component. The SM4T14AY (without the 'C') is a unidirectional version, which only clamps in one polarity and requires correct orientation on the board. For AC-coupled or bipolar transient protection on a 12V rail, the bidirectional CAY variant simplifies layout and avoids reverse-installation errors."},{"question":"Is SM4T14CAY suitable for 12V automotive systems?","answer":"Yes. With a 12V reverse standoff voltage, the SM4T14CAY is specifically rated for nominal 12V DC rails. It will not conduct at the normal 12V bus voltage, but will begin clamping above 13.3V, protecting downstream electronics from load-dump and other transients up to 25.3V at the peak pulse current. This matches the protection requirements for automotive 12V electronic control units (ECUs), sensors, and infotainment modules."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T14CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T14CAY 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}}