{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ18A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ18A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ18A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ18A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ, TRANSIL™ series, SMAJ18A-TR, Zener TVS diode, 400W peak pulse power, 18V reverse standoff, 39.3V clamping, DO-214AC (SMA) package, surface mount.","salesMarkdown":"## Transient protection for 18 V rails It delivers 400 W peak pulse power per the 10/1000 µs waveform, with a clamping voltage of 39.3 V at the peak pulse current of 59 A (8/20 µs). The 18 V reverse standoff voltage means this diode will not conduct appreciably below 18 V, so it sits across a 12 V or 15 V rail without loading it. The 20 V minimum breakdown voltage ensures the avalanche region starts before the rail exceeds its absolute maximum. The 39.3 V clamping voltage is the peak voltage the protected IC sees during a surge — if the downstream part is rated for, say, 40 V absolute max, this clamp keeps it inside the safe operating area. The SMA footprint is standard — no exotic pad geometry required.","metaTitle":"STMicroelectronics SMAJ18A-TR TVS Diode, 400W, 18V Standoff","metaDescription":"STMicroelectronics SMAJ18A-TR Zener TVS diode, 400W peak pulse power, 18V standoff, 39.3V clamping. Active lifecycle, DO-214AC (SMA) package.","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":"SMAJ18","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)":"20V","Voltage - Clamping (Max) @ Ipp":"39.3V","Voltage - Reverse Standoff (Typ)":"18V","Current - Peak Pulse (10/1000µs)":"59A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ18A-TR/alternatives.json"},"ai":{"faq":[{"question":"Can SMAJ18A-TR be replaced by SMAJ18A without the -TR suffix?","answer":"Yes — the -TR suffix denotes Tape & Reel packaging. The base part SMAJ18A is the same die and electrical specification; the difference is only the shipping format (cut tape vs. reel)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ18A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ18A-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}}