{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ30CA-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SMAJ30CA-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/SMAJ30CA-TR","factsUrl":"https://icboms.com/api/mcp/products/SMAJ30CA-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SMAJ, TRANSIL™, Type Zener, 400W, Bidirectional, 30V Reverse Standoff, 33.3V Breakdown, 64.3V Clamping, 36A (8/20µs), DO-214AC (SMA), Surface Mount, -55°C~150°C.","salesMarkdown":"## TVS protection for 30 V rails in a compact SMA footprint The STMicroelectronics SMAJ30CA-TR is a bidirectional Zener-type transient voltage suppression diode from the SMAJ / TRANSIL™ series, designed to clamp overvoltage transients on 30 V nominal supply rails. It delivers 400 W peak pulse power per the 10/1000 µs waveform, with a breakdown voltage window starting at 33.3 V and a maximum clamping voltage of 64.3 V at the peak pulse current of 36 A (8/20 µs waveform). ## 400 W peak pulse power — sizing the protection for your rail The 400 W rating (10/1000 µs) defines the energy the diode can absorb in a single pulse. For a 30 V rail, this translates to clamping a surge that would otherwise exceed the downstream IC's absolute maximum rating. The bidirectional configuration means a single device protects both positive and negative transients, which is useful on AC-coupled lines or where the polarity of the fault is unknown. The 36 A peak pulse current at the 8/20 µs waveform gives a real-world check for IEC 61000-4-5 surge testing at the equipment level. This removes the sourcing risk of a last-time-buy or forced redesign mid-production. ## Package and footprint — DO-214AC (SMA) The DO-214AC (also designated SMA) is a standard JEDEC outline with a 2.6 mm body width and 4.6 mm length, requiring a PCB land pattern of approximately 3.0 mm × 2.0 mm per pad.","metaTitle":"STMicroelectronics SMAJ30CA-TR TVS Diode, 400W Bidirectional","metaDescription":"STMicroelectronics SMAJ30CA-TR bidirectional TVS diode, 400W peak pulse power, 30V standoff, DO-214AC (SMA) package. Active lifecycle, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SMAJ, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"400W","Base Product Number":"SMAJ30","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Voltage - Breakdown (Min)":"33.3V","Voltage - Clamping (Max) @ Ipp":"64.3V","Voltage - Reverse Standoff (Typ)":"30V","Current - Peak Pulse (10/1000µs)":"36A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cb45a0c551131e855efff64db719fd1e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SMAJ30CA-TR/alternatives.json"},"ai":{"faq":[{"question":"What is the peak pulse power rating of SMAJ30CA-TR?","answer":"The SMAJ30CA-TR is rated for 400 W peak pulse power under the 10/1000 µs waveform. This is the standard industrial surge rating that defines its ability to clamp transients on a 30 V rail without exceeding the junction temperature limit."},{"question":"Is SMAJ30CA-TR a bidirectional TVS diode?","answer":"Yes, the SMAJ30CA-TR has one bidirectional channel, meaning it clamps both positive and negative overvoltage events symmetrically. This is indicated by the 'CA' suffix in the ordering code — 'C' denotes bidirectional, while 'A' (without the 'C') would be unidirectional."},{"question":"What is the difference between SMAJ30CA-TR and SMAJ30A?","answer":"The SMAJ30CA-TR is bidirectional (clamps both polarities), while the SMAJ30A is unidirectional (clamps only one polarity, typically used on DC rails where the polarity is fixed). Both share the same 400 W peak pulse power rating and DO-214AC package, so they are footprint-compatible. The -TR suffix on the SMAJ30CA-TR indicates tape-and-reel packaging; the SMAJ30A may be ordered in tube or tape depending on the full ordering code."},{"question":"Where can I buy SMAJ30CA-TR with current stock?","answer":"The SMAJ30CA-TR is available to order through independent distribution channels. Current stock levels and pricing are confirmed at the time of quote — submit an RFQ against your target quantity and we will source it from our multi-supplier network."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SMAJ30CA-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SMAJ30CA-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}}