{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM6T39CA","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM6T39CA","canonicalUrl":"https://icboms.com/stmicroelectronics/SM6T39CA","factsUrl":"https://icboms.com/api/mcp/products/SM6T39CA","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM6T39CA, TRANSIL™ series, bidirectional TVS Zener, 33.3 V reverse standoff, 69.7 V clamping, 600 W peak pulse, DO-214AA SMB, surface mount.","salesMarkdown":"## 33.3 V standoff — what it protects Its reverse standoff voltage of 33.3 V means it stays transparent during normal operation, only conducting when a surge pushes the line above the 37.1 V minimum breakdown threshold. With a peak pulse power rating of 600 W (10/1000 µs waveform) and a clamping voltage of 69.7 V at the rated 57 A peak pulse current (8/20 µs), this part handles the kind of inductive load dump or lightning-induced surge you see in industrial control, telecom line cards, and automotive 24 V battery systems. The single bidirectional channel protects both polarities from a single DO-214AA SMB package, saving board space versus two unidirectional devices back-to-back. ## 600 W peak pulse — sizing the protection The 600 W rating is the peak pulse power dissipation for an 8/20 µs waveform, which is the standard test for ESD and fast transient immunity per IEC 61000-4-5. For a 24 V nominal rail (like a truck or industrial bus), the 33.3 V standoff gives about 38% headroom above the regulated voltage, so the TVS does not conduct on normal ripple or load steps. The 69.7 V clamping voltage is the maximum the protected circuitry sees during the surge — check that this is below the absolute maximum rating of your downstream ICs. If your transient energy exceeds 600 W for the given pulse width, step up to the SM6T series next-higher power tier or parallel two devices. ## Active and RoHS compliant — sourcing posture It is RoHS compliant per the standard directive, so it fits into lead-free reflow assembly without a waiver.","metaTitle":"STMicroelectronics SM6T39CA Bidirectional TVS","metaDescription":"SM6T39CA from STMicroelectronics: 33.3 V reverse standoff, 69.7 V clamping, 600 W peak pulse, bidirectional, DO-214AA SMB. Active, RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SM6T, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"600W","Base Product Number":"SM6T39","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMB (DO-214AA)","Voltage - Breakdown (Min)":"37.1V","Voltage - Clamping (Max) @ Ipp":"69.7V","Voltage - Reverse Standoff (Typ)":"33.3V","Current - Peak Pulse (10/1000µs)":"57A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1e6a6ede6221d6b6009e7d617f0a0cd9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SM6T39CA/alternatives.json"},"ai":{"faq":[{"question":"Is SM6T39CA unidirectional or bidirectional?","answer":"It is a single bidirectional channel, clamping both positive and negative transients symmetrically. The breakdown voltage is the same in both directions."},{"question":"Is SM6T39CA RoHS compliant?","answer":"Yes, the part is RoHS compliant, suitable for lead-free soldering processes."},{"question":"What is the peak pulse current rating of SM6T39CA?","answer":"The peak pulse current is 57 A for an 8/20 µs waveform, at the clamping voltage of 69.7 V."},{"question":"Does SM6T39CA have an equivalent from other brands?","answer":"Bidirectional TVS diodes in a DO-214AA package with a 33.3 V standoff and 600 W rating are available from several manufacturers, but pin-for-pin compatibility and surge ratings should be verified against the specific application transient profile."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM6T39CA","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM6T39CA 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}}