{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T56CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T56CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T56CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T56CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T56CAY, Automotive Grade Zener TVS, 3000W (3kW) Peak Pulse Power, 48V Reverse Standoff, Bidirectional, Single Channel, DO-214AB (SMC), Surface Mount, AEC-Q101 Qualified, -55°C to 175°C.","salesMarkdown":"The STMicroelectronics SM30T56CAY is a bidirectional Zener TVS diode in the DO-214AB (SMC) surface-mount package, rated for 3000W (3kW) peak pulse power per the 10/1000µs waveform. It is qualified to AEC-Q101, which means it has passed the automotive-grade stress tests for reliability in under-hood and chassis-domain electronics. The 48V reverse standoff voltage (VRWM) is the maximum DC or peak AC voltage the protected line can carry without the TVS conducting appreciable leakage. For a 48V nominal bus — common in automotive battery systems, industrial 48V rails, or PoE++ circuits — this part sits right at the nominal voltage, so it stays out of the way during normal operation. The minimum breakdown voltage of 53.2V (at the test current) is the point where the device starts to avalanche. This gives roughly 5V of headroom above the 48V standoff, which is a typical margin for a 48V rail with ±10% tolerance. The clamping voltage is specified at 76.6V maximum at the rated peak pulse current of 38A. That 76.6V clamp is the voltage the downstream circuitry must survive; if your load-dump or surge transient exceeds that, the TVS may not protect the load. The single bidirectional channel means one device clamps both positive and negative transients symmetrically. This saves board area and component count compared to using two unidirectional TVS diodes back-to-back. ## Package and mounting The SM30T56CAY is supplied in the SMC package, a standard surface-mount footprint for medium-power TVS diodes.","metaTitle":"STMicroelectronics SM30T56CAY Automotive TVS, 3kW","metaDescription":"STMicroelectronics SM30T56CAY automotive TVS diode. 3kW peak pulse power, 48V reverse standoff, bidirectional, AEC-Q101.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Grade":"Automotive","Series":"*","Package":"Tape & Reel (TR) Cut Tape (CT)","Applications":"-","Mounting Type":"Surface Mount","Qualification":"AEC-Q101","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"3000W (3kW)","Base Product Number":"SM30T56","Operating Temperature":"-55°C ~ 175°C (TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"53.2V","Voltage - Clamping (Max) @ Ipp":"76.6V","Voltage - Reverse Standoff (Typ)":"48V","Current - Peak Pulse (10/1000µs)":"38A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM30T56CAY a bidirectional TVS?","answer":"Yes, the SM30T56CAY is a single-channel bidirectional Zener TVS. It clamps both positive and negative transients symmetrically, so a single device protects a signal or power line against surges of either polarity."},{"question":"Is SM30T56CAY automotive qualified?","answer":"Yes, the SM30T56CAY is qualified to AEC-Q101, the automotive-grade stress test standard for discrete semiconductors. This qualification is required for components used in Tier-1 and OEM automotive electronics, including engine control units, transmission modules, and body controllers."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T56CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T56CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:58:56.542Z","lastPublished":"2026-07-16T14:58:56.542Z","indexable":true}}