{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T39CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T39CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T39CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T39CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T39CAY, Automotive AEC-Q101 TRANSIL™ TVS Diode, Bidirectional, 33V Standoff, 36.7V Breakdown, 53.3V Clamping, 3000W Peak Pulse, 56.3A Ipp, DO-214AB SMC, -55°C to 175°C.","salesMarkdown":"## What the SM30T39CAY protects and where it goes The STMicroelectronics SM30T39CAY is a bidirectional TRANSIL™ TVS diode from the automotive SM30TY series, qualified to AEC-Q101. It is designed to clamp voltage transients on 33V nominal rails — typical for 24V automotive systems, truck electricals, and industrial 28V supplies — with a peak pulse power rating of 3000W (3kW) under the 10/1000µs waveform. The single bidirectional channel handles both positive and negative surges, which simplifies layout on AC-coupled or bipolar signal lines and eliminates the risk of reverse-installation errors during rework. ## Breakdown and clamping — where the protection window sits The reverse standoff voltage is 33V, meaning the diode stays high-impedance below that level and does not load the protected rail. Breakdown is guaranteed at a minimum of 36.7V, and clamping is held to a maximum of 53.3V at the rated peak pulse current of 56.3A. That 53.3V ceiling is the let-through voltage a downstream DC-DC converter or ECU input must survive. For a 24V nominal system with a 36V load-dump clamp upstream, this part provides a second-stage transient shield without interfering with normal bus voltage.","metaTitle":"SM30T39CAY STMicroelectronics TVS Diode, 3000W","metaDescription":"STMicroelectronics SM30T39CAY TRANSIL™ TVS diode, 3000W peak pulse power, 33V standoff, bidirectional, AEC-Q101 automotive qualified, -55°C to 175°C.","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, SM30TY, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"3000W (3kW)","Base Product Number":"SM30T39","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"36.7V","Voltage - Clamping (Max) @ Ipp":"53.3V","Voltage - Reverse Standoff (Typ)":"33V","Current - Peak Pulse (10/1000µs)":"56.3A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can the SM30T39CAY be used in automotive applications?","answer":"Yes. The -55°C to 175°C operating temperature range covers under-hood and engine-bay environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T39CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T39CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:19:23.249Z","lastPublished":"2026-07-16T15:19:23.249Z","indexable":true}}