{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ100A-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ100A-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ100A-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ100A-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ, TRANSIL™, Type Zener, 100V reverse standoff, 212V clamping, 400W peak pulse, 1 unidirectional channel, DO-214AC (SMA) surface mount, -55°C~150°C.","salesMarkdown":"## What this TRANSIL™ TVS does on the board The STMicroelectronics SMAJ100A-TR is a unidirectional transient voltage suppressor from the TRANSIL™ series, built on Zener technology. It is designed to clamp voltage spikes on a 100V DC rail — the reverse standoff voltage (100V) is the maximum steady-state voltage it can sit across without conducting. When a surge hits, it breaks down at a minimum of 111V and clamps the peak to 212V at the rated pulse current (11A for an 8/20µs waveform). The SMAJ100A-TR is officially marked obsolete. STMicroelectronics no longer manufactures this exact order code. For new designs or repair of existing boards, you will need to source from the independent surplus and broker channel. ## Key ratings for the repair bench If you are troubleshooting a board where this part is scorched or shorted, the 100V reverse standoff tells you the rail it protects — measure the DC bus voltage; if it exceeds 100V in normal operation, the TVS was underspecified. The unidirectional channel means it only clamps positive spikes relative to ground; a bidirectional version would be needed for AC or bipolar rails. The DO-214AC (SMA) footprint is common and easy to hand-replace with a hot-air station — just watch the polarity marking (cathode band) when placing the new part.","metaTitle":"STMicroelectronics SMAJ100A-TR TVS Diode, 100V Standoff","metaDescription":"STMicroelectronics SMAJ100A-TR TRANSIL™ TVS diode, 100V reverse standoff, 212V clamping, 400W peak pulse, DO-214AC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","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":"Obsolete","lifecycle_stage":"eol_hot","Power - Peak Pulse":"400W","Base Product Number":"SMAJ","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)":"111V","Voltage - Clamping (Max) @ Ipp":"212V","Voltage - Reverse Standoff (Typ)":"100V","Current - Peak Pulse (10/1000µs)":"11A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ100A-TR/alternatives.json"},"ai":{"faq":[{"question":"Is the SMAJ100A-TR obsolete?","answer":"Yes, the SMAJ100A-TR is officially obsolete. STMicroelectronics no longer produces it. For replacement options, see the FAQ item below."},{"question":"What is the replacement for SMAJ100A-TR?","answer":"STMicroelectronics does not list an official successor for the SMAJ100A-TR. The closest functional alternative is another TRANSIL™ TVS in the SMAJ family with a 100V reverse standoff and DO-214AC package — for example, the SMAJ100A (without the -TR suffix) may be a pin-compatible option, but you must verify the clamping voltage (212V) and peak pulse current (11A) match your surge requirements. We can help cross-reference against your specific application — contact us with your RFQ."},{"question":"Is SMAJ100A-TR unidirectional or bidirectional?","answer":"It is unidirectional with one channel. It clamps positive transients only; for bidirectional protection (e.g., AC lines), you would need a different part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ100A-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ100A-TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:54:42.092Z","lastPublished":"2026-07-16T14:54:42.092Z","indexable":true}}