{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ170A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ170A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ170A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ170A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ170A-TR, TRANSIL™ TVS, 170V reverse standoff, 189V min breakdown, 353V clamping at 6.5A, 400W peak pulse, unidirectional, DO-214AC (SMA), -55°C to 150°C.","salesMarkdown":"## 170V standoff — the rail voltage it protects The SMAJ170A-TR is a unidirectional TRANSIL™ TVS diode from STMicroelectronics, part of the SMAJ series. With a minimum breakdown voltage of 189V and a clamping voltage of 353V at the peak pulse current of 6.5A (8/20µs waveform), the part absorbs a 400W peak pulse (10/1000µs). The 353V clamp is the ceiling the downstream silicon sees during a surge — if your DC bus or signal line rides at 170V nominal, this part keeps the transient below 353V. ## Package and temperature — board-fit realities Housed in a DO-214AC (SMA) package, it is a surface-mount device with a standard footprint shared across the SMAJ family. The SMA package's thermal pad area on the PCB directly sets the junction-to-ambient thermal resistance; a 1 oz copper pour under the cathode tab helps sink the 400W pulse without exceeding the 150°C limit.","metaTitle":"STMicroelectronics SMAJ170A-TR TVS Diode, 170V Standoff","metaDescription":"STMicroelectronics SMAJ170A-TR TRANSIL TVS: 170V reverse standoff, 189V min breakdown, 353V clamping at 6.5A, 400W peak pulse. DO-214AC SMA. Active production.","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":"SMAJ170","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)":"189V","Voltage - Clamping (Max) @ Ipp":"353V","Voltage - Reverse Standoff (Typ)":"170V","Current - Peak Pulse (10/1000µs)":"6.5A (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/SMAJ170A-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMAJ170A-TR RoHS compliant?","answer":"The evidence does not list a specific RoHS compliance statement for this order code. Most ST TRANSIL SMAJ series parts are RoHS-compliant by design; confirm the latest status with the datasheet or your ST sales contact."},{"question":"Is SMAJ170A-TR equivalent to SMAJ170A?","answer":"The SMAJ170A-TR and SMAJ170A share the same base product number SMAJ170. The -TR suffix indicates tape-and-reel packaging; the electrical specifications — 170V standoff, 189V breakdown, 353V clamp, 400W peak pulse — are identical per the SMAJ series datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ170A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ170A-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}}