{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ40CAE3/TR13","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SMAJ40CAE3-TR13","canonicalUrl":"https://icboms.com/microchip/SMAJ40CAE3-TR13","factsUrl":"https://icboms.com/api/mcp/products/SMAJ40CAE3%2FTR13","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology SMAJ40CAE3/TR13, Zener TVS diode, 500W peak pulse power, 40V reverse standoff, bidirectional, single channel, DO-214AC (SMA) package, -65°C to 150°C operating range.","salesMarkdown":"The SMAJ40CAE3/TR13 is a Zener-type bidirectional TVS diode from Microchip's SMAJ family, rated for 500W peak pulse power at 10/1000µs waveform. It clamps a 40V nominal rail to 64.5V maximum at 7.8A peak pulse current, making it a direct fit for general-purpose overvoltage protection on 40V DC buses, 24VAC secondary rectified lines, or automotive load-dump scenarios where the steady-state voltage stays under 40V. That saves board space and BOM count on signal lines or power inputs that see surges of either polarity. The 64.5V clamping voltage at 7.8A is the ceiling the protected circuit sees during a 10/1000µs surge. If your downstream components (DC-DC converter input, relay coil, sensor supply) have an absolute maximum rating below 64.5V, this TVS will not protect them — the rail will exceed their breakdown before the TVS clamps. For a 40V nominal rail, 64.5V clamp is typical and leaves margin for 50V-rated parts. The 500W peak pulse power rating is the product of clamp voltage and peak current at the specified waveform. Actual power dissipation in a real transient depends on pulse width and duty cycle — the 10/1000µs waveform is the standard telecom surge shape. For shorter pulses (8/20µs), the peak current capability is higher; for longer pulses, derate per the datasheet curve. ## Lifecycle and production status — still active, no EOL signal ## Package and mounting — DO-214AC (SMA) footprint Surface-mount DO-214AC (SMA) package, 0.50 mm pitch between the anode and cathode pads. The cathode is marked with a band on the body; for a bidirectional device, both polarities clamp, so orientation matters only for the marking — the electrical function is symmetric. Standard reflow profile per JEDEC J-STD-020, peak temperature 260°C. The lower limit covers cold-soak in outdoor or aerospace environments; the upper limit keeps the TVS functional under sustained high ambient or self-heating during repetitive surges. Storage temperature matches the operating range, so the reels can sit in a non-climate-controlled storeroom without issue.","metaTitle":"SMAJ40CAE3/TR13 TVS Diode – 500W, 40V, Bidirectional","metaDescription":"Microchip SMAJ40CAE3/TR13 Zener TVS diode, 500W peak pulse power, 40V reverse standoff, bidirectional, DO-214AC (SMA). Active production. Sourced per RFQ.","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); Cut Tape (CT)","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":"SMAJ40","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AC (SMA)","Voltage - Breakdown (Min)":"44.4V","Voltage - Clamping (Max) @ Ipp":"64.5V","Voltage - Reverse Standoff (Typ)":"40V","Current - Peak Pulse (10/1000µs)":"7.8A"}},"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":"Is SMAJ40CAE3/TR13 bidirectional?","answer":"Yes, it has a single bidirectional channel. It clamps transients of either polarity on the same line, so you do not need two series diodes or a bridge rectifier for AC-coupled or bipolar signal protection."},{"question":"What is the closest pin-compatible alternative to SMAJ40CAE3/TR13?","answer":"Any SMAJ40CA (bidirectional, 40V standoff) in DO-214AC from other major TVS manufacturers (e.g., Littelfuse, Vishay, Bourns) is a functional cross. The key specs to match are 500W peak pulse, 40V reverse standoff, and bidirectional polarity. Confirm the clamping voltage and peak current match your surge requirement before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SMAJ40CAE3-TR13","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SMAJ40CAE3-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}}