{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMBJ40CA-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMBJ40CA-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMBJ40CA-TR","factsUrl":"https://icboms.com/api/mcp/products/SMBJ40CA-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMBJ40CA-TR, TRANSIL™ series, bidirectional TVS diode, 40V reverse standoff, 64.5V clamp, 600W peak pulse power, DO-214AA (SMB) package, surface mount, -55°C to 150°C.","salesMarkdown":"The single bidirectional channel handles both positive and negative transients, so you place one device across the rail rather than two back-to-back Zeners. ## Clamping voltage and the headroom decision The 64.5 V clamp at 9.7 A peak pulse current sets the let-through voltage that the downstream circuitry must survive. If your rail is 48 V nominal, the 16.5 V headroom between rail and clamp is tight for a 60 V-rated downstream FET — you'll want to verify the FET's avalanche capability or step to a higher-voltage device. On a 36 V rail the margin improves, and a 60 V-rated component has comfortable room. Rated for junction temperature from -55°C to 150°C, the SMBJ40CA-TR covers the full industrial temperature band and extends into automotive under-hood zones without derating. The DO-214AA (SMB) surface-mount package keeps the footprint small — about the size of a 1206 resistor — and the MSL rating is typically Level 1, meaning no bake required before reflow if stored dry.","metaTitle":"STMicroelectronics SMBJ40CA-TR TVS Diode, 600W Bidirectional","metaDescription":"ST SMBJ40CA-TR bidirectional TVS diode, 40V standoff, 64.5V clamp, 600W peak pulse power. Active lifecycle, -55°C to 150°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SMBJ, TRANSIL™","Package":"Tape & Reel (TR) Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"600W","Base Product Number":"SMBJ40","Operating Temperature":"-55°C ~ 150°C (TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMB (DO-214AA)","Voltage - Breakdown (Min)":"44.4V","Voltage - Clamping (Max) @ Ipp":"64.5V","Voltage - Reverse Standoff (Typ)":"40V","Current - Peak Pulse (10/1000µs)":"9.7A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/28916e022258112f057e7568b7920d5a.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMBJ40CA-TR/alternatives.json"},"ai":{"faq":[{"question":"Is SMBJ40CA-TR bidirectional?","answer":"Yes, the SMBJ40CA-TR has one bidirectional channel, meaning it clamps both positive and negative transients with a single device across the rail."},{"question":"What is the peak pulse power of SMBJ40CA-TR?","answer":"It is rated for 600 W peak pulse power measured with a 10/1000 µs waveform, delivering 9.7 A peak pulse current at the 64.5 V clamp voltage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMBJ40CA-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMBJ40CA-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}}