{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMCJ78C","brand":"Diotec Semiconductor","brandSlug":"diotec-semiconductor","productSlug":"1.5SMCJ78C","canonicalUrl":"https://icboms.com/diotec-semiconductor/1.5SMCJ78C","factsUrl":"https://icboms.com/api/mcp/products/1.5SMCJ78C","rawCanonicalId":null},"summary":{"shortDescription":"Diotec Semiconductor Zener TVS diode, 1.5SMCJ78C, unidirectional, 1500W peak pulse (10/1000µs), 78V reverse standoff (typ), 139V clamping (max @ Ipp), 10.8A peak pulse, DO-214AB (SMC) surface-mount, -50°C to 150°C junction.","salesMarkdown":"## What a 1.5 kW standoff-voltage TVS actually protects The 1.5SMCJ78C is a unidirectional Zener-type TVS diode rated 1500 W peak pulse at a 10/1000 µs waveform — meaning it survives a 1.5 kJ transient event when the pulse fits within that time envelope. The 78 V reverse standoff is the working voltage the protected rail normally sits at; the diode stays off and invisible until a surge arrives. When the transient exceeds the 86.7 V breakdown minimum, the device clamps the line to 139 V maximum at 10.8 A peak — that 1.79× clamping ratio determines how much voltage the downstream load actually sees during the event. ## Package and thermal context Mounted in the DO-214AB (SMC) surface-mount package, the part dissipates the transient energy into the PCB copper under the device. Junction temperature rating is -50°C to 150°C — this is the industrial and automotive transient suppression band, not a commercial-interior temperature grade. Thermal impedance from junction to ambient is governed by the pad layout; the -50°C floor means the part can be specified into equipment that sees cold storage or outdoor deployment before energisation. ## What the part is not — and why that matters for selection Bidirectional protection requires the bidirectional variant (1.5SMCJ78CA — the CA suffix denotes bidirectional).","metaTitle":"1.5SMCJ78C TVS Diode, 78V, 1.5kW, DO-214AB","metaDescription":"Diotec 1.5SMCJ78C unidirectional TVS diode, 1500W peak pulse, 78V standoff, 139V clamping. Surface-mount DO-214AB (SMC). Active production — quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Diotec Semiconductor","Type":"Zener","Series":"-","Package":"Strip","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Operating Temperature":"-50°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC/DO-214AB","Voltage - Breakdown (Min)":"86.7V","Voltage - Clamping (Max) @ Ipp":"139V","Voltage - Reverse Standoff (Typ)":"78V","Current - Peak Pulse (10/1000µs)":"10.8A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8068","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3fb0502b23c3703cafef426b7b2bf7e5.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5SMCJ78C/alternatives.json"},"ai":{"faq":[{"question":"What does the 78 V standoff voltage mean for my design?","answer":"The 78 V reverse standoff is the maximum working voltage the protected rail operates at without the TVS conducting — the diode presents a high impedance up to this level. Transient events above 86.7 V trigger breakdown, and the clamping ceiling holds the line at 139 V maximum during a 10.8 A peak pulse. For a 24 V nominal rail this gives a comfortable 3.25× headroom to standoff; for a 48 V rail the headroom narrows to 1.6× and the clamping ratio becomes a meaningful design constraint."},{"question":"What is the 1.5SMCJ78C's listed type on this Circuit Protection line?","answer":"The part is listed as a Zener type — specifically a Zener-based unidirectional TVS diode in the 1.5SMC series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/diotec-semiconductor/1.5SMCJ78C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/diotec-semiconductor/1.5SMCJ78C 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}}