{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ48CA-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ48CA-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ48CA-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ48CA-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ48CA-TR, TRANSIL™ series, bidirectional TVS diode, 400W peak pulse power, 48V reverse standoff, 100V clamping, DO-214AC SMA package, surface mount, -55°C to 150°C.","salesMarkdown":"## What this TVS diode does on the board The bidirectional configuration means a single device protects lines that swing both positive and negative relative to ground — useful for AC signal lines, RS-485 buses, or power rails where polarity reversal is possible. ## 400W peak pulse — what it handles For a 48V rail, the clamping voltage maxes out at 100V at the rated 23A peak pulse current (8/20µs waveform). That means a surge that would otherwise punch through a 60V-rated downstream regulator gets shunted to ground before the oxide breaks down. With one bidirectional channel, the SMAJ48CA-TR clamps symmetrically in both directions. That saves a board layout from needing two unidirectional TVS diodes back-to-back, which matters when the protected line carries AC or sees reverse-voltage faults. The breakdown voltage starts at 53.3V minimum, so the part begins conducting before the 100V clamp ceiling is reached — giving a defined snap-back characteristic typical of Zener-based suppressors. ## DO-214AC SMA footprint and temperature range No power line protection built in — this is a signal-rail or low-power-supply clamp, not a mains-side MOV replacement. For dual-sourcing flexibility, the SMAJ series includes multiple voltage variants in the same DO-214AC footprint — a 48V bidirectional is the specific rating, but the base product number SMAJ48 covers the family.","metaTitle":"STMicroelectronics SMAJ48CA-TR Bidirectional TVS Diode, 400W","metaDescription":"STMicroelectronics SMAJ48CA-TR is a 400W bidirectional TVS diode in DO-214AC SMA package. 48V reverse standoff, 100V clamping. Active, available to order.","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":"SMAJ48","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)":"53.3V","Voltage - Clamping (Max) @ Ipp":"100V","Voltage - Reverse Standoff (Typ)":"48V","Current - Peak Pulse (10/1000µs)":"23A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ48CA-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMAJ48CA-TR bidirectional or unidirectional?","answer":"It is bidirectional — one channel clamps symmetrically in both directions, so it protects AC signal lines or power rails that may see reverse polarity without needing two diodes."},{"question":"What is the peak pulse power of SMAJ48CA-TR?","answer":"The peak pulse power rating is 400W under the 10/1000µs waveform, with a clamping voltage of 100V at the 8/20µs peak pulse current of 23A."},{"question":"What package and footprint does SMAJ48CA-TR use?","answer":"It comes in a DO-214AC (SMA) surface-mount package, a standard footprint shared with many SMBJ and SMCJ suppressors for easy layout compatibility."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ48CA-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ48CA-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}}