{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ20A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ20A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ20A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ20A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ20A-TR, TRANSIL™ TVS diode, Type Zener, 400W peak pulse power, 20V reverse standoff, 22.2V breakdown, 42.8V clamping, DO-214AC (SMA) surface mount, -55°C to 150°C.","salesMarkdown":"## 400W peak pulse power in a DO-214AC package It is a unidirectional Zener-type suppressor in a DO-214AC (SMA) surface-mount package, rated for general-purpose overvoltage protection across a -55°C to 150°C operating junction temperature range. ## What the 20V standoff and 42.8V clamp mean for your rail When a transient exceeds the 22.2V breakdown threshold, the diode avalanches and clamps the surge to 42.8V maximum at the 54A peak pulse current (8/20µs waveform). That clamp voltage is what the protected device sees; a 42.8V clamp on a 20V rail means the downstream components need a 42.8V or higher absolute maximum rating to survive the event.","metaTitle":"STMicroelectronics SMAJ20A-TR TVS Diode, 400W, 20V Standoff","metaDescription":"STMicroelectronics SMAJ20A-TR TRANSIL™ TVS diode. 400W peak pulse power, 20V standoff, 22.2V breakdown, DO-214AC SMA package. -55°C to 150°C. Active.","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":"SMAJ20","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)":"22.2V","Voltage - Clamping (Max) @ Ipp":"42.8V","Voltage - Reverse Standoff (Typ)":"20V","Current - Peak Pulse (10/1000µs)":"54A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ20A-TR/alternatives.json"},"ai":{"faq":[{"question":"What is the peak pulse power of SMAJ20A-TR?","answer":"The SMAJ20A-TR is rated for 400W peak pulse power per the 10/1000µs waveform."},{"question":"Does SMAJ20A-TR have a bidirectional option?","answer":"No, the SMAJ20A-TR is a unidirectional TVS diode. The SMAJ20CA-TR is the bidirectional counterpart in the same series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ20A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ20A-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}}