{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMCJ24CA-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMCJ24CA-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMCJ24CA-TR","factsUrl":"https://icboms.com/api/mcp/products/SMCJ24CA-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMCJ24CA-TR, TRANSIL™ series, bidirectional TVS diode, 1500W peak pulse power, 24V reverse standoff voltage, 50V clamping, 200A peak pulse current, DO-214AB SMC package, -55°C to 150°C operating temperature.","salesMarkdown":"## What this TVS does and why it matters The STMicroelectronics SMCJ24CA-TR is a bidirectional TVS diode from the TRANSIL™ SMCJ series, designed to clamp transient overvoltages on a 24V rail. Its 1500W peak pulse power rating (10/1000µs waveform) handles substantial surge energy, while the 50V clamping voltage at 200A (8/20µs) limits the let-through voltage to a level that protects downstream ICs. The bidirectional configuration means a single device protects both positive and negative transients — useful for AC-coupled lines or symmetrical signal pairs where polarity isn't fixed. ## 1500W peak pulse power — what it buys you The 1500W rating (10/1000µs) is the standard telecom surge test level for secondary protection in 24V systems. It means this part can absorb a single 1ms-wide pulse up to 1500W without failing — enough for most industrial and automotive transient events like load dump or inductive kickback. For repetitive surges, derate per the pulse derating curve; the junction temperature limit of 150°C is the hard ceiling. ## Bidirectional vs. unidirectional — picking the right one The 'CA' in SMCJ24CA-TR signals bidirectional; the single-direction variant is SMCJ24A-TR. Bidirectional clamps symmetrically at ±50V, making it the choice for AC signals, RS-485 transceivers, or any line where the polarity isn't ground-referenced. Unidirectional gives a lower clamping voltage for positive-going spikes on a DC rail, but requires two devices for bipolar protection. For a 24V DC bus with a known ground reference, the unidirectional version may give tighter protection; for general-purpose board-level transient suppression where you don't want to think about polarity, the bidirectional part is the simpler call. It's larger than the SMA/SMB siblings, which means better thermal dissipation for the 1500W rating. The cathode band is marked for unidirectional parts; on the bidirectional version, the band is absent or both ends are marked — verify orientation with the datasheet marking diagram. That means it's suitable for outdoor telecom cabinets, engine bay electronics, and downhole tools where the ambient can exceed 125°C. The 150°C junction limit also provides headroom for self-heating during repetitive surge events — the thermal impedance of the SMC package is low enough that a single 1500W pulse raises the junction about 100°C, so at 25°C ambient you're still inside the limit. For dual-sourcing resilience, the SMCJ24CA-TR is pin-compatible with other manufacturers' SMCJ24CA devices — the DO-214AB footprint and electrical specs follow the industry-standard JEDEC outline, so cross-sourcing is straightforward.","metaTitle":"SMCJ24CA-TR TVS Diode, Bidirectional, 1500W, DO-214AB","metaDescription":"SMCJ24CA-TR bidirectional TVS diode, 1500W peak pulse power, 24V standoff, 50V clamp at 200A, DO-214AB SMC package, -55°C to 150°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SMCJ, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"SMCJ24","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC (DO-214AB)","Voltage - Breakdown (Min)":"26.7V","Voltage - Clamping (Max) @ Ipp":"50V","Voltage - Reverse Standoff (Typ)":"24V","Current - Peak Pulse (10/1000µs)":"200A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/afa32e66ad58d9d3b67a92acb79ea14b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMCJ24CA-TR/alternatives.json"},"ai":{"faq":[{"question":"What is the peak pulse power rating of SMCJ24CA-TR?","answer":"The peak pulse power rating is 1500W for a 10/1000µs waveform. For the 8/20µs waveform, the peak pulse current is 200A with a clamping voltage of 50V."},{"question":"Is SMCJ24CA-TR bidirectional or unidirectional?","answer":"SMCJ24CA-TR is bidirectional. The 'CA' suffix indicates bidirectional clamping; the unidirectional version is SMCJ24A-TR."},{"question":"Can SMCJ24CA-TR be used for 24V line protection?","answer":"Yes. The reverse standoff voltage is 24V, meaning it will not conduct at normal 24V operating levels. Breakdown occurs at 26.7V minimum, and clamping is at 50V maximum — suitable for protecting 24V rails from transients up to 1500W."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMCJ24CA-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMCJ24CA-TR 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}}