{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMCJ18C","brand":"Diotec Semiconductor","brandSlug":"diotec-semiconductor","productSlug":"1.5SMCJ18C","canonicalUrl":"https://icboms.com/diotec-semiconductor/1.5SMCJ18C","factsUrl":"https://icboms.com/api/mcp/products/1.5SMCJ18C","rawCanonicalId":null},"summary":{"shortDescription":"Diotec Semiconductor 1.5SMCJ18C Zener TVS diode, unidirectional, 1500W peak pulse, 18V reverse standoff, 32.2V clamping, 46.6A peak pulse current, DO-214AB SMC surface-mount package, operating temperature -50°C to 150°C junction.","salesMarkdown":"## What 18V standoff and 32.2V clamping mean for the protected rail The 1.5SMCJ18C holds off at 18 V without conducting — the protected rail sees no TVS loading in normal operation. That 14.2 V differential between standoff and clamp is the protection headroom the downstream circuitry lives on. The clamping voltage at 32.2 V times the peak current of 46.6 A gives roughly 1.5 kW, so the datasheet ratings are consistent with the power class. On a 24 V nominal DC rail, the 18 V standoff gives adequate margin above the operating voltage while keeping the breakdown below the 32.2 V clamping ceiling most downstream ICs tolerate. ## SMC/DO-214AB surface-mount footprint — reflow assembly fit The DO-214AB (SMC) package is the mid-size TVS footprint — larger than the SMA (DO-214AC) and smaller than the SMB (DO-214AA). It lands on a standard IPC-7351 pattern; the cathode band marks polarity on the sleeve. For a unidirectional TVS the band faces the protected line; pin 1 is the cathode. The strip packaging means it ships on tape or rail intended for production pick-and-place — confirm your feeder can handle the DO-214AB form factor before committing a new production build. ## Unidirectional vs bidirectional — which surge direction this clamps For AC rails or signal lines that swing both polarities, a bidirectional TVS or two antiparallel unidirectional diodes are required. The single bidirectional channel entry describes the device topology, not the protection mode: this part is polarity-sensitive on the input side. Verify the surge threat in the application is unidirectional before selecting it — a reverse-polarity surge on an unprotected negative half-cycle can destroy the diode.","metaTitle":"1.5SMCJ18C TVS Diode, 18V standoff, 1.5kW peak pulse","metaDescription":"Diotec Semiconductor 1.5SMCJ18C unidirectional Zener TVS diode, DO-214AB SMC package, 1500W peak pulse, 18V standoff 32.2V clamp at 46.6A. Surface mount.","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)":"20V","Voltage - Clamping (Max) @ Ipp":"32.2V","Voltage - Reverse Standoff (Typ)":"18V","Current - Peak Pulse (10/1000µs)":"46.6A"}},"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/1.5SMCJ18C/alternatives.json"},"ai":{"faq":[{"question":"What is the 1.5SMCJ18C used for in a circuit?","answer":"This unidirectional Zener TVS diode protects DC rails and signal lines from voltage transients. With an 18 V standoff and 32.2 V clamping ceiling, it suits 12 V and 24 V nominal systems where the downstream load cannot tolerate transients above the clamping level. It is listed as general-purpose — not rated for dedicated power-line protection, so use it on secondary rails or low-voltage signal paths, not on AC mains inputs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/diotec-semiconductor/1.5SMCJ18C","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/diotec-semiconductor/1.5SMCJ18C 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}}