{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T28CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T28CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T28CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T28CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T28CAY, Automotive AEC-Q101 TRANSIL™ bidirectional TVS diode, 3000W peak pulse power, 24V reverse standoff, 38.9V clamping, DO-214AB SMC surface mount.","salesMarkdown":"## 3000W bidirectional TVS for 24V automotive rails The STMicroelectronics SM30T28CAY is a bidirectional Zener-type TVS diode from the TRANSIL™ series, rated for 3000W peak pulse power (10/1000µs waveform) and qualified to AEC-Q101 for automotive applications. It protects a 24V nominal rail with a reverse standoff voltage of 24V, a minimum breakdown of 26.7V, and a maximum clamping voltage of 38.9V at the 77.1A peak pulse current. The single bidirectional channel makes it suitable for protecting AC-coupled or bipolar signal lines where polarity-independent clamping is required. ## What the 3000W rating means for the BOM The 3000W peak pulse power rating defines the energy-handling capability for a single 10/1000µs surge event. For a 24V system, this translates to a clamping voltage of 38.9V at the rated current, which keeps downstream components within their safe operating area during load-dump or inductive-load transients. The 77.1A peak pulse current gives a direct check against the expected surge current from the system's worst-case transient — if the calculated surge exceeds this figure, a higher-power device or external protection network is needed. The surface-mount assembly keeps the board compatible with reflow processes common in automotive ECU production. ## Automotive qualification and temperature range AEC-Q101 qualification means the SM30T28CAY has passed the stress tests required for automotive-grade discrete semiconductors, including high-temperature reverse bias, temperature cycling, and humidity testing. The -55°C low end also supports cold-crank and arctic-condition operation. The product status is listed as Active, indicating ongoing production with no announced end-of-life.","metaTitle":"STMicroelectronics SM30T28CAY TVS Diode, 3000W Bidirectional","metaDescription":"STMicroelectronics SM30T28CAY bidirectional TVS diode, 3000W peak pulse power, 24V standoff, 38.9V clamping, AEC-Q101 qualified, DO-214AB SMC package.","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":"SM30T28","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"26.7V","Voltage - Clamping (Max) @ Ipp":"38.9V","Voltage - Reverse Standoff (Typ)":"24V","Current - Peak Pulse (10/1000µs)":"77.1A"}},"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":"Is SM30T28CAY a bidirectional TVS diode?","answer":"Yes, it has one bidirectional channel, meaning it clamps both positive and negative transients symmetrically — useful for AC signal lines or bipolar power rails where polarity-independent protection is needed."},{"question":"What are the replacements for SM30T28CAY?","answer":"The base product number SM30T28 covers a family of AEC-Q101 qualified TVS diodes in the SMC package. Pin-compatible alternatives within the same TRANSIL™ series share the same footprint and voltage ratings, allowing dual-sourcing for supply resilience."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T28CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T28CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:48.183Z","lastPublished":"2026-07-16T15:42:48.183Z","indexable":true}}