{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMF12AT3G","brand":"onsemi","brandSlug":"onsemi","productSlug":"SMF12AT3G","canonicalUrl":"https://icboms.com/onsemi/SMF12AT3G","factsUrl":"https://icboms.com/api/mcp/products/SMF12AT3G","rawCanonicalId":null},"summary":{"shortDescription":"onsemi SMF12AT3G Zener TVS diode, 200 W peak pulse power, 12 V reverse standoff, 19.9 V clamp, single unidirectional channel, SOD-123F surface-mount package, -55°C to 150°C junction temperature.","salesMarkdown":"## 200 W Zener TVS — protecting a 12 V rail in SOD-123F With a reverse standoff of 12 V, breakdown at 13.3 V min, and clamping at 19.9 V max at 10.1 A (10/1000 µs pulse), it keeps the protected circuit below typical 20 V absolute-maximum ratings for downstream ICs on a 12 V bus. The SOD-123F package keeps the footprint small — about 2.6 mm × 1.6 mm — so it fits tight layouts on a 12 V input line or low-voltage DC bus where board space is at a premium. A functional cross-reference within the same SMF series (same SOD-123F package, similar voltage rating) may exist — verify the breakdown and clamp voltages against the original design target before substituting. The unidirectional channel (single Zener) clamps positive transients referenced to ground; it does not protect against negative-going spikes unless paired with a series diode or a bidirectional TVS.","metaTitle":"SMF12AT3G onsemi Zener TVS — 200 W, 12 V Standoff, SOD-123F","metaDescription":"SMF12AT3G onsemi Zener TVS diode: 200 W peak pulse, 12 V reverse standoff, 19.9 V clamp, SOD-123F surface mount. RFQ for availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"onsemi","Type":"Zener","Series":"-","Package":"Tape & Reel (TR)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"SOD-123F","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Power - Peak Pulse":"200W","Base Product Number":"SMF","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SOD-123FL","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"13.3V","Voltage - Clamping (Max) @ Ipp":"19.9V","Voltage - Reverse Standoff (Typ)":"12V","Current - Peak Pulse (10/1000µs)":"10.1A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/937f692c43fee570c6c4dd81187595e8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the replacement for SMF12AT3G?","answer":"No official replacement or pin-compatible successor is recorded from onsemi. A functional cross-reference within the SMF series (same SOD-123F package, similar voltage) may work — verify the breakdown voltage (13.3 V min) and clamp voltage (19.9 V max) match your protection window before substituting."},{"question":"SMF12AT3G vs SMF12A — what is the difference?","answer":"The SMF12A is a similar 200 W Zener TVS in the same SOD-123F package with the same 12 V standoff and 19.9 V clamp. The key difference is the breakdown voltage tolerance band — the SMF12AT3G uses a tighter ±5% tolerance on VBR compared to the SMF12A's standard ±5% (both are 5%, but the 'T3G' suffix may indicate a specific test or packaging variant). Check the exact breakdown min/max on the datasheet for your rail margin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/SMF12AT3G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/SMF12AT3G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-18T13:48:27.571Z","lastPublished":"2026-07-18T13:48:27.571Z","indexable":true}}