{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T19CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T19CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T19CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T19CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T19CAY bidirectional TVS diode, TRANSIL series, 3000W peak pulse power, 16V reverse standoff, 26V clamping, AEC-Q101, DO-214AB SMC package.","salesMarkdown":"## 3 kW TVS clamp for 16 V automotive buses The STMicroelectronics SM30T19CAY is a bidirectional Zener-type transient voltage suppressor from the TRANSIL family, designed to protect sensitive electronics on 16 V nominal supply rails from surges up to 3 kW peak pulse power per the 10/1000 µs waveform. It clamps a 115.4 A peak pulse current to 26 V maximum, which keeps the voltage stress on downstream components like ECUs, sensors, or communication transceivers within their safe operating area during load-dump or ISO 7637 transients. ## Peak pulse power and clamping — the protection envelope At 3 kW peak pulse power, this part absorbs substantial surge energy before the clamping action limits the voltage. The 26 V clamp at 115.4 A defines the worst-case transient the protected circuit sees — the key figure for confirming headroom against the absolute maximum ratings of the ICs on that rail. With a 16 V reverse standoff voltage, the SM30T19CAY is intended for continuous DC bus voltages up to 16 V; it remains high-impedance below that threshold and only starts conducting significantly above the 17.8 V minimum breakdown voltage. The single bidirectional channel means the same device clamps both positive and negative transients symmetrically, which simplifies bill-of-materials count on balanced signal lines or power rails where polarity reversal protection is also needed. ## Package and mounting — SMC footprint for power dissipation Housed in the DO-214AB (SMC) surface-mount package, the SM30T19CAY provides a larger copper pad area under the cathode tab compared to smaller SMA/SMB packages, which lowers the thermal resistance to the PCB and supports the 3 kW surge rating without exceeding the junction temperature limit. Surface-mount assembly with standard reflow profiles applies; the SMC footprint requires a PCB land pattern sized per the package drawing to handle the peak current without trace lift-off. No power line protection feature is built in — this is a transient clamp, not a regulator. ## Lifecycle and sourcing status This makes it suitable for new design-in as well as sustained production runs. No official second-source or pin-compatible cross-reference is listed in the ledger, so dual-sourcing evaluation would require testing an alternative from the same TRANSIL series or a competitive automotive TVS family.","metaTitle":"SM30T19CAY TVS Diode, 3 kW, 26 V Clamp, AEC-Q101, SMC","metaDescription":"STMicroelectronics SM30T19CAY bidirectional TVS diode, 3 kW peak pulse power, 26 V clamping, AEC-Q101 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":"SM30T19","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"17.8V","Voltage - Clamping (Max) @ Ipp":"26V","Voltage - Reverse Standoff (Typ)":"16V","Current - Peak Pulse (10/1000µs)":"115.4A"}},"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 SM30T19CAY AEC-Q101 qualified?","answer":"Yes, the SM30T19CAY is part of the Automotive, AEC-Q101 qualified TRANSIL series from STMicroelectronics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T19CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T19CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T16:25:10.524Z","lastPublished":"2026-07-16T16:25:10.524Z","indexable":true}}