{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM6T39CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM6T39CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM6T39CAY","factsUrl":"https://icboms.com/api/mcp/products/SM6T39CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM6T39CAY, Automotive AEC-Q101 TRANSIL TVS, 600W peak pulse power, 33.3V reverse standoff, 69.7V clamping, bidirectional, DO-214AA SMB package, -55°C to 150°C.","salesMarkdown":"## TVS for automotive bus protection It clamps transients at 69.7V maximum while carrying a 33.3V reverse standoff rating, making it a fit for 24V vehicle electrical systems or 28V nominal industrial rails. ## Bidirectional — one device for symmetrical lines With a single bidirectional channel, the SM6T39CAY protects signal pairs where polarity reverses or where AC coupling exists — CAN bus, LIN bus, or RS-485 transceiver lines. No need to series two unidirectional devices; one SMB footprint covers both positive and negative transients. The breakdown voltage starts at 37.1V minimum, so it stays clear of the 33.3V standoff under steady-state conditions. The 150°C TJ ceiling gives margin for self-heating during repetitive surge events. Housed in the DO-214AA (SMB) surface-mount package, the SM6T39CAY fits standard SMB footprints used across the SM6TY family. The SMB body is large enough to dissipate the 600W pulse without requiring a heatsink, but the PCB copper landing pads should follow the recommended pattern from the application note to keep thermal impedance low.","metaTitle":"STMicroelectronics SM6T39CAY TVS Diode, 600W, Bidirectional","metaDescription":"STMicroelectronics SM6T39CAY automotive AEC-Q101 TRANSIL TVS. 33.3V standoff, 69.7V clamp, 600W peak pulse. SMB package. 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, SM6TY, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"600W","Base Product Number":"SM6T39","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMB (DO-214AA)","Voltage - Breakdown (Min)":"37.1V","Voltage - Clamping (Max) @ Ipp":"69.7V","Voltage - Reverse Standoff (Typ)":"33.3V","Current - Peak Pulse (10/1000µs)":"57A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3a95ac6513bab2f04fd61565540cbe6f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SM6T39CAY/alternatives.json"},"ai":{"faq":[{"question":"Is SM6T39CAY bidirectional?","answer":"Yes, it is a single bidirectional channel device, clamping both positive and negative transients."},{"question":"Is SM6T39CAY AEC-Q101 qualified?","answer":"Yes, it is part of the Automotive series and listed as AEC-Q101 qualified."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM6T39CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM6T39CAY 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}}