{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T56AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T56AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T56AY","factsUrl":"https://icboms.com/api/mcp/products/SM30T56AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T56AY, Automotive AEC-Q101 TRANSIL™ TVS, 48 V reverse standoff, 76.6 V clamping, 3 kW peak pulse, DO-214AB SMC, surface mount.","salesMarkdown":"## 48 V rail clamp for automotive transient protection The STMicroelectronics SM30T56AY is a unidirectional TRANSIL™ TVS diode from the SM30TY series, designed to clamp transients on 48 V nominal power rails in automotive electronics. The part handles a peak pulse power of 3000 W (3 kW) per the 10/1000 µs waveform, clamping at 76.6 V maximum while conducting 38 A peak pulse current. This is not a standard Zener regulator — it is a surge-rated protection device meant to shunt energy from load-dump, alternator field decay, and inductive kickback events. The 76.6 V clamping voltage at 38 A peak pulse current tells the board designer the maximum voltage the protected circuitry will see during a surge. For a 48 V nominal rail, this clamp leaves a comfortable margin below typical downstream MOSFET or IC breakdown voltages. ## Temperature range and automotive deployment The AEC-Q101 qualification covers the rigorous automotive stress tests: high-temperature reverse bias, temperature cycling, and humidity bias. This is the grade required for safety-critical and high-reliability automotive subsystems. ## Package and footprint — SMC (DO-214AB) Housed in a DO-214AB (SMC) surface-mount package, the SM30T56AY fits standard SMC footprints used across many automotive TVS diodes. The SMC body is larger than the smaller SMA/SMB packages, which helps dissipate the heat from repeated pulse events.","metaTitle":"STMicroelectronics SM30T56AY TVS Diode, 3 kW, AEC-Q101, SMC","metaDescription":"STMicroelectronics SM30T56AY automotive TVS diode, 3 kW peak pulse power, 76.6 V clamping, AEC-Q101 qualified, 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":"SM30T56","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","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":"$1.4300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM30T56AY AEC-Q101 qualified?","answer":"Yes, the SM30T56AY is part of the Automotive, AEC-Q101, SM30TY series, so it meets the automotive qualification standard for discrete semiconductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T56AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T56AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:52.879Z","lastPublished":"2026-07-16T15:42:52.879Z","indexable":true}}