{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ40CA-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ40CA-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ40CA-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ40CA-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ, TRANSIL™ series, Type Zener, Bidirectional Channels 1, Voltage - Reverse Standoff (Typ) 40V, Voltage - Breakdown (Min) 44.4V, Voltage - Clamping (Max) @ Ipp 84V, Power - Peak Pulse 400W, Package / Case DO-214AC, SMA, Surface Mount, Operating Temperature -55°C~150°C(TJ).","salesMarkdown":"## 40V standoff, 44.4V breakdown, 84V clamp — the three voltages that define protection Breakdown occurs at a minimum of 44.4V, and the clamping voltage is held to 84V at the peak pulse current. That 84V let-through is what the downstream circuitry must survive. The single bidirectional channel protects both positive and negative surges, so one device replaces two unidirectional diodes in a back-to-back configuration. ## 400W peak pulse power in DO-214AC — surge rating vs footprint Rated at 400W peak pulse power per the 10/1000µs waveform, with a peak pulse current of 27A under the 8/20µs shape. The DO-214AC (SMA) surface-mount package is the standard footprint for this power class — the same case used across the SMAJ family. For a production BOM, this part carries no forced-migration risk.","metaTitle":"STMicroelectronics SMAJ40CA-TR TVS Diode, 400W Bidirectional","metaDescription":"STMicroelectronics SMAJ40CA-TR bidirectional TVS diode, 40V standoff, 44.4V min breakdown, 84V clamp, 400W peak pulse power in 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":"SMAJ40","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Voltage - Breakdown (Min)":"44.4V","Voltage - Clamping (Max) @ Ipp":"84V","Voltage - Reverse Standoff (Typ)":"40V","Current - Peak Pulse (10/1000µs)":"27A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ40CA-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMAJ40CA-TR bidirectional?","answer":"Yes, it has a single bidirectional channel. It clamps both positive and negative transients symmetrically, so polarity does not matter during placement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ40CA-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ40CA-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}}