{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM15T12AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM15T12AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM15T12AY","factsUrl":"https://icboms.com/api/mcp/products/SM15T12AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM15T12AY, Automotive Grade Zener TVS Diode, 1500W Peak Pulse Power, 10.2V Reverse Standoff, 21.7V Clamping, DO-214AB SMC Package, AEC-Q101 Qualified, -40°C to 150°C.","salesMarkdown":"## Transient protection for 12V automotive rails The STMicroelectronics SM15T12AY is a unidirectional Zener-type transient voltage suppression (TVS) diode designed to clamp overvoltage transients on DC power rails. It is rated for 1500W peak pulse power (1.5kW) over a 10/1000µs waveform, with a reverse standoff voltage of 10.2V, a minimum breakdown voltage of 11.4V, and a maximum clamping voltage of 21.7V at the rated peak pulse current of 461A (8/20µs waveform). The part is qualified to AEC-Q101, making it suitable for automotive and other high-reliability environments where transient immunity is specified. ## Clamping voltage and rail protection margin For a 12V nominal supply, the 10.2V standoff voltage means the diode does not conduct during normal operation, leaving the rail undisturbed. The 11.4V minimum breakdown ensures the device starts clamping before the rail exceeds safe limits for downstream electronics rated at 16V or higher. The 21.7V maximum clamp at peak current is the voltage the protected circuit must survive during the transient — typical 12V automotive loads (ECUs, sensors, actuators) are designed for load-dump pulses up to 35V, so this clamp level provides adequate margin for most secondary protection stages. ## Package and mounting for production The SM15T12AY is supplied in the DO-214AB (SMC) package, a surface-mount footprint common for medium-power TVS diodes. The SMC body handles the 1500W pulse without requiring a heatsink in normal PCB layouts, though thermal via stitching under the package's cathode tab improves heat spreading during repetitive surges. The part is AEC-Q101 qualified, which includes moisture sensitivity level (MSL) testing and high-temperature reverse bias (HTRB) stress — requirements for automotive PPAP submissions. ## Sourcing and lifecycle posture This removes the obsolescence risk that often drives urgent BOM searches for older TVS diodes.","metaTitle":"SM15T12AY STMicroelectronics Zener TVS, 1500W, AEC-Q101","metaDescription":"SM15T12AY from STMicroelectronics is a 1500W automotive-grade Zener TVS diode in DO-214AB (SMC). AEC-Q101 qualified, 10.2V standoff, 21.7V clamp.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Grade":"Automotive","Series":"*","Package":"Tape & Reel (TR) Cut Tape (CT)","Applications":"-","Mounting Type":"Surface Mount","Qualification":"AEC-Q101","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"SM15T12","Operating Temperature":"-40°C ~ 150°C (TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"11.4V","Voltage - Clamping (Max) @ Ipp":"21.7V","Voltage - Reverse Standoff (Typ)":"10.2V","Current - Peak Pulse (10/1000µs)":"461A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d3caa9efa0f4fede168088411f4832fd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy SM15T12AY and what is the lead time?","answer":"Submit an RFQ for a firm commitment on availability and delivery."},{"question":"Is SM15T12AY AEC-Q101 qualified?","answer":"Yes, SM15T12AY is AEC-Q101 qualified, which means it has passed automotive-grade reliability testing including high-temperature reverse bias, temperature cycling, and moisture resistance. This qualification is required for components used in automotive ECUs, sensors, and other under-hood electronics."},{"question":"Is SM15T12AY a suitable replacement for SM15T12?","answer":"SM15T12AY is the automotive-qualified (AEC-Q101) version of the base SM15T12 part. Electrical characteristics — standoff voltage, breakdown voltage, clamping voltage, and peak pulse power — are identical. The 'Y' suffix indicates automotive grade, so SM15T12AY is a direct functional replacement with the added reliability screening for automotive applications."},{"question":"Does SM15T12AY have a different clamping voltage than SM15T12A?","answer":"The SM15T12AY and SM15T12A share the same clamping voltage specification of 21.7V maximum at the rated peak pulse current. The difference is the automotive qualification (AEC-Q101) on the 'AY' suffix versus the standard commercial grade on the 'A' variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM15T12AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM15T12AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:21.841Z","lastPublished":"2026-07-16T15:42:21.841Z","indexable":true}}