{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMBJ45E3/TR13","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SMBJ45E3-TR13","canonicalUrl":"https://icboms.com/microchip/SMBJ45E3-TR13","factsUrl":"https://icboms.com/api/mcp/products/SMBJ45E3%2FTR13","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology SMBJ45E3/TR13, Zener TVS diode, 45V reverse standoff, 80.3V clamp at 7.5A, 600W peak pulse, DO-214AA SMB package, surface mount, tape and reel.","salesMarkdown":"## What this TVS protects and how it clamps Its reverse standoff voltage (Vrwm) is 45V, meaning it does not conduct at normal operating levels on that rail. When a surge exceeds the minimum breakdown voltage of 50V, the device avalanches and clamps the peak voltage to 80.3V at the peak pulse current of 7.5A (10/1000µs waveform). ## Package and mounting — DO-214AA SMB The SMB package is larger than the smaller SMA (DO-214AC) variant, which gives it better thermal mass for repetitive surge handling. The part ships on tape and reel (TR suffix), compatible with automated pick-and-place assembly. Operating temperature spans -65°C to 150°C junction, wider than the commercial 0-70°C range — suitable for outdoor enclosures, industrial cabinets, or under-hood environments where temperature swings are routine. The base product number is SMBJ45, and the suffix denotes lead-free / RoHS-compliant finish. No official second-source cross-reference is published by Microchip, but the DO-214AA footprint is widely used across the TVS industry; Littelfuse, Vishay, and onsemi offer functionally similar 45V unidirectional TVS diodes in the same package that can be evaluated as alternates. ## Application fit and selection note The unidirectional channel means it clamps only positive transients above the breakdown voltage; for AC or bidirectional protection, two devices back-to-back or a bidirectional TVS would be needed. The 80.3V clamp voltage gives a 35.3V margin above the 45V rail — check that the downstream components (DC-DC converter input, IC supply pins) have an absolute maximum rating above 80.3V. If the rail is 48V nominal (e.g., PoE or telecom), the 45V Vrwm is a tight fit; a 48V or 51V TVS would avoid nuisance triggering during normal ripple.","metaTitle":"SMBJ45E3/TR13 TVS Diode – 45V, 600W, DO-214AA, Microchip","metaDescription":"SMBJ45E3/TR13 Zener TVS from Microchip Technology. 45V reverse standoff, 80.3V clamp, 600W peak pulse, DO-214AA SMB package. Active production, surface-mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Microchip Technology","Type":"Zener","Series":"-","Package":"Tape & Reel (TR)","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":"SMBJ45","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMBJ (DO-214AA)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"50V","Voltage - Clamping (Max) @ Ipp":"80.3V","Voltage - Reverse Standoff (Typ)":"45V","Current - Peak Pulse (10/1000µs)":"7.5A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2850","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f566c62ad8bf6be9ecf452f6999d0b7a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to SMBJ45E3/TR13?","answer":"The DO-214AA (SMB) package is standard across the TVS industry. Littelfuse, Vishay, and onsemi each offer 45V unidirectional TVS diodes with similar electrical specs (45V Vrwm, ~80V clamp, 600W peak pulse) in the same SMB footprint. No single official cross-reference is published by Microchip, so you would need to compare the breakdown voltage tolerance and clamping curves from each vendor's datasheet before qualifying an alternate."},{"question":"Can I replace SMBJ45E3/TR13 with SMBJ45A?","answer":"The SMBJ45A is a different suffix variant — the 'A' typically denotes a bidirectional TVS in the same family, while the /TR13 is unidirectional and lead-free. Check the exact part marking: if the BOM calls for unidirectional, a bidirectional part will not clamp correctly on a DC rail. Also verify the package — both are DO-214AA, so the footprint matches, but the electrical behaviour differs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SMBJ45E3-TR13","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SMBJ45E3-TR13 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}}