{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T35CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T35CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T35CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T35CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T35CAY, Automotive AEC-Q101, TRANSIL™, Bidirectional TVS Zener, 30V reverse standoff, 48.4V clamping, 3kW peak pulse, DO-214AB SMC, -55°C to 175°C.","salesMarkdown":"## 3 kW bidirectional TVS for 30 V automotive rails The STMicroelectronics SM30T35CAY is a bidirectional Zener TVS diode from the SM30TY TRANSIL™ series, qualified to AEC-Q101 for automotive applications. It protects a 30 V nominal rail, clamping a 10/1000 µs surge to 48.4 V maximum while handling 62 A peak pulse current and 3000 W peak pulse power. The DO-214AB (SMC) package is a surface-mount footprint common in engine-control units, body controllers, and any 12 V or 24 V vehicle bus that sees load-dump or inductive-kick transients. ## 48.4 V clamp — what the load actually sees The 48.4 V maximum clamping voltage at 62 A is the number that matters for downstream silicon stress. A 30 V reverse standoff means the diode is invisible to the rail under normal operation; leakage is negligible. When a surge hits, the TVS folds the transient to 48.4 V, which keeps a typical 40 V-rated downstream DC-DC or linear regulator inside its absolute-maximum rating. The 3 kW peak pulse rating (10/1000 µs waveform) covers the energy of a standard automotive load-dump pulse per ISO 7637-2, pulse 5a or 5b, depending on the suppression level needed. The AEC-Q101 qualification means this part has passed the automotive stress tests: high-temperature reverse bias, humidity, power and temperature cycling, and ESD. The SMC package has a large copper slug on the bottom — the board's thermal vias and copper pour directly affect how much continuous power the part can sink. For repetitive pulses, derate the peak power per the datasheet's pulse-width curve. No last-time-buy notice, no end-of-life announcement.","metaTitle":"STMicroelectronics SM30T35CAY TVS Diode, 30V, 3kW, DO-214AB","metaDescription":"SM30T35CAY bidirectional TVS, 30V standoff, 48.4V clamp at 62A, 3kW peak pulse. AEC-Q101 automotive grade, -55°C to 175°C. Active production.","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":"SM30T35","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"33.3V","Voltage - Clamping (Max) @ Ipp":"48.4V","Voltage - Reverse Standoff (Typ)":"30V","Current - Peak Pulse (10/1000µs)":"62A"}},"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":"What is the closest pin-compatible alternative to SM30T35CAY in this family?","answer":"Within the SM30TY TRANSIL™ series, the unidirectional version (SM30T35AY) shares the same DO-214AB footprint and breakdown voltage but protects only one polarity. For a bidirectional replacement, any other SM30T35CAY from the same date code is the direct match. No second-source cross is listed in the STMicroelectronics documentation."},{"question":"What compliance documentation does STMicroelectronics provide for SM30T35CAY?","answer":"As an AEC-Q101 qualified part, STMicroelectronics provides a PPAP (Production Part Approval Process) package, a PCN (Product Change Notification) subscription, and RoHS/REACH compliance declarations. The part is also UL 497B recognized for secondary surge protection in telecom equipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T35CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T35CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:20:18.353Z","lastPublished":"2026-07-16T15:20:18.353Z","indexable":true}}