{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ78E3/TR13","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SMAJ78E3-TR13","canonicalUrl":"https://icboms.com/microchip/SMAJ78E3-TR13","factsUrl":"https://icboms.com/api/mcp/products/SMAJ78E3%2FTR13","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology SMAJ78E3/TR13, Zener TVS diode, 78V reverse standoff, 139V clamp at 3.6A, 500W peak pulse power (10/1000µs), surface-mount DO-214AC (SMA), Tape & Reel.","salesMarkdown":"## What the 500W peak pulse power buys you The SMAJ78E3/TR13 is a Zener-type TVS diode rated for 500W peak pulse power under the 10/1000µs waveform. That 500W rating is the energy-absorption ceiling for a single pulse — it tells you how much transient energy the diode can clamp before the junction gives up. For a 78V rail, the 139V clamp means the protected line sees a hard ceiling at that voltage during the event, which keeps downstream silicon inside its breakdown margin. The reverse standoff voltage of 78V is the DC bias the diode ignores — your rail must stay below that in normal operation, or the diode conducts continuously and overheats. Unidirectional, single-channel, so it clamps only one polarity; the other polarity forward-biases the Zener junction like a standard diode. ## Package and temperature reach Housed in DO-214AC (SMA), a standard surface-mount footprint that reflows on a standard profile — no exotic pad geometry. The operating junction temperature range is -65°C to 150°C, which covers industrial outdoor enclosures, engine-bay electronics, and cold-start down to -65°C. That's wider than the typical commercial 0°C–70°C grade, so it fits in telecom cabinets and automotive modules that see thermal cycling. No power line protection, meaning it's designed for signal or low-power DC rails, not AC mains. The base product number is SMAJ78, so any variant with that base shares the same die and package family.","metaTitle":"SMAJ78E3/TR13 – Microchip 78V Zener TVS, 500W","metaDescription":"Microchip Technology SMAJ78E3/TR13 Zener TVS diode. 78V reverse standoff, 139V clamp, 500W peak pulse power. Active production, surface-mount DO-214AC.","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":"SMAJ78","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)":"86.7V","Voltage - Clamping (Max) @ Ipp":"139V","Voltage - Reverse Standoff (Typ)":"78V","Current - Peak Pulse (10/1000µs)":"3.6A"}},"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 closest pin-compatible alternative to SMAJ78E3/TR13?","answer":"Any DO-214AC (SMA) 500W Zener TVS with a 78V reverse standoff and similar clamp voltage is a functional equivalent — for example, the Littelfuse SMAJ78A or Vishay SMAJ78A. Confirm the breakdown voltage (86.7V min for this part,) and clamp at 3.6A (139V,) match your protection threshold. The SMAJ series is a standard footprint, so the swap is a direct BOM line replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SMAJ78E3-TR13","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SMAJ78E3-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}}