{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ43A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ43A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ43A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ43A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ43A-TR, TRANSIL™ series, Zener TVS diode, 400W peak pulse power, 43V reverse standoff, unidirectional, DO-214AC (SMA) surface-mount package, -55°C to 150°C junction temperature.","salesMarkdown":"## 43V rail guard in a compact SMA package It delivers 400W peak pulse power in the standard DO-214AC (SMA) surface-mount package, making it a common choice for protecting DC power inputs, relay coils, and industrial sensor lines where board space is tight. ## Clamping voltage and the protection window The protection window is defined by three voltages: reverse standoff at 43V (the rail voltage it leaves alone), minimum breakdown at 47.8V (where it starts conducting), and maximum clamping at 91V at the rated peak pulse current of 25A (8/20µs waveform). The 91V clamp is the voltage the downstream circuitry must survive — a 100V-rated MOSFET or capacitor on that rail has comfortable margin; a 60V-rated part does not. The 25A peak pulse current rating gives a direct check against the expected transient energy in the application.","metaTitle":"STMicroelectronics SMAJ43A-TR TVS Diode, 43V Standoff, 400W","metaDescription":"STMicroelectronics SMAJ43A-TR is a 400W unidirectional TVS diode in DO-214AC (SMA) package. 43V reverse standoff, 47.8V breakdown, 91V clamping.","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":"SMAJ43","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)":"47.8V","Voltage - Clamping (Max) @ Ipp":"91V","Voltage - Reverse Standoff (Typ)":"43V","Current - Peak Pulse (10/1000µs)":"25A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/708f2ed7c12f7111d9c2900a8e772667.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ43A-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMAJ43A-TR unidirectional?","answer":"Yes, it is a unidirectional TVS diode, meaning it protects against positive transients referenced to ground. For bidirectional protection on an AC line or a bipolar rail, a different device from the SMAJ family would be needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ43A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ43A-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}}