{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ12A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ12A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ12A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ12A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ, TRANSIL™ series, TVS Zener diode, unidirectional, 12V reverse standoff, 13.3V breakdown, 25.3V clamping, 400W peak pulse power, DO-214AC SMA package, surface mount, -55°C to 150°C operating temperature.","salesMarkdown":"## 12V rail protection in a DO-214AC SMA package It offers a reverse standoff voltage of 12V, a minimum breakdown voltage of 13.3V, and a maximum clamping voltage of 25.3V at the peak pulse current of 91A (8/20 µs waveform). This is a standard catalog part from STMicroelectronics, widely available through distribution channels. ## What the clamping and breakdown voltages mean for your rail The 12V reverse standoff voltage means the diode will not conduct appreciably below 12V, so it sits across a 12V supply without loading it. The 13.3V minimum breakdown ensures the device starts clamping before the rail exceeds safe levels. The 25.3V maximum clamping at 91A is the worst-case voltage the protected circuitry sees during a surge — ensure downstream components are rated above this level. The 400W peak pulse power (8/20 µs) defines the energy the diode can absorb in a single transient event; for repetitive surges or longer pulse widths, derate accordingly.","metaTitle":"STMicroelectronics SMAJ12A-TR TVS Diode, 12V Standoff, 400W","metaDescription":"STMicroelectronics SMAJ12A-TR TRANSIL TVS diode: 12V reverse standoff, 13.3V breakdown, 25.3V clamping at 91A, 400W peak pulse power, DO-214AC SMA, -55°C to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SMAJ, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"400W","Base Product Number":"SMAJ12","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"13.3V","Voltage - Clamping (Max) @ Ipp":"25.3V","Voltage - Reverse Standoff (Typ)":"12V","Current - Peak Pulse (10/1000µs)":"91A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ12A-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMAJ12A-TR unidirectional or bidirectional?","answer":"It is a unidirectional device with one channel. It protects against positive transients relative to ground."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ12A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ12A-TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}