{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ18E3/TR13","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SMAJ18E3-TR13","canonicalUrl":"https://icboms.com/microchip/SMAJ18E3-TR13","factsUrl":"https://icboms.com/api/mcp/products/SMAJ18E3%2FTR13","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology SMAJ18E3/TR13, Zener TVS Diode, 500W Peak Pulse Power, 18V Reverse Standoff, Unidirectional, DO-214AC (SMA) Package, Tape & Reel","salesMarkdown":"## 500W Zener TVS in a DO-214AC footprint The SMAJ18E3/TR13 is a unidirectional Zener TVS diode from Microchip Technology, rated for 500W peak pulse power per the 10/1000µs waveform. It clamps at 32.2V max with a 15.5A peak pulse current, and its 18V reverse standoff voltage makes it a fit for protecting 12V or 15V rails where the nominal line stays below 18V. Minimum breakdown voltage is 20V, giving a 2V guard band above the 18V standoff — enough headroom to avoid nuisance triggering from normal line ripple or load transients. The 32.2V clamp sets the maximum voltage the downstream circuitry sees during a surge event; a 12V rail with a 30V absolute-max input would be at risk if the clamp exceeds that ceiling. Microchip lists the SMAJ18E3/TR13 as Active. ## Single-channel unidirectional — polarity matters This is a single unidirectional channel. It protects one DC rail with the cathode toward the positive supply. For AC signal lines or bidirectional clamping, a different part from the SMAJ family would be needed. The DO-214AC (SMA) package is a common surface-mount footprint; the copper pad area under the cathode tab influences thermal resistance during repetitive surge events.","metaTitle":"SMAJ18E3/TR13 – Microchip 500W Zener TVS, DO-214AC, Active","metaDescription":"SMAJ18E3/TR13 from Microchip Technology: 500W peak pulse power, 18V reverse standoff, unidirectional Zener TVS in DO-214AC (SMA).","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-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"500W","Base Product Number":"SMAJ18","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AC (SMA)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"20V","Voltage - Clamping (Max) @ Ipp":"32.2V","Voltage - Reverse Standoff (Typ)":"18V","Current - Peak Pulse (10/1000µs)":"15.5A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/7b3ddece4863b4621debe180df56adc8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the peak pulse power of SMAJ18E3/TR13?","answer":"This rating defines the energy the device can absorb in a single surge event before the junction temperature exceeds the safe operating area."},{"question":"Is SMAJ18E3/TR13 unidirectional or bidirectional?","answer":"Unidirectional — one channel with the cathode marked on the package. It clamps positive transients above the breakdown voltage; reverse polarity below the standoff voltage is blocked. For bidirectional protection on AC lines, a different SMAJ variant is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SMAJ18E3-TR13","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SMAJ18E3-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}}