{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L6981C33DR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L6981C33DR","canonicalUrl":"https://icboms.com/stmicroelectronics/L6981C33DR","factsUrl":"https://icboms.com/api/mcp/products/L6981C33DR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L6981C33DR step-down buck converter, 3.3 V fixed output, 1.5 A, 400 kHz, synchronous rectifier, 8-SOIC surface mount, -40 to 150 °C junction.","salesMarkdown":"## Synchronous buck at 1.5 A — what the ratings mean for your rail The L6981C33DR is a 1.5 A, 3.3 V fixed-output step-down converter from STMicroelectronics, switching at 400 kHz with an integrated synchronous rectifier. The 3.5 V to 38 V input range lets it run off a wide variety of unregulated rails — 12 V industrial bus, 24 V automation supply, or a 5 V pre-regulator — without a separate linear pre-drop. The synchronous rectifier eliminates the external freewheeling Schottky diode, saving one component and one placement site per design. At 1.5 A and 400 kHz, the internal low-side FET carries the inductor current during the off-time, so the efficiency curve stays above 85% across most of the load range in typical 12 V-to-3.3 V conversion. Junction temperature is rated from -40°C to 150°C — the same thermal grade as automotive-qualified parts in the family. For a 1.5 A load at 85°C ambient, the junction stays under 125°C with reasonable copper area on the 8-SOIC footprint. ## Sourcing posture: active, ROHS3, no end-of-life signal Sourced through independent distribution channels; availability and current pricing are confirmed at the time of RFQ. No minimum order quantity or lead-time guarantee is stated here — quote against your BOM quantity.","metaTitle":"STMicroelectronics L6981C33DR Buck Converter","metaDescription":"STMicroelectronics L6981C33DR step-down buck converter, 3.3V fixed output at 1.5A, 400kHz switching, synchronous rectifier, 8-SOIC, -40 to 150°C junction.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Down","Topology":"Buck","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Current - Output":"1.5A","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"400kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Synchronous Rectifier":"Yes","Voltage - Input (Max)":"38V","Voltage - Input (Min)":"3.5V","Supplier Device Package":"8-SO","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.87","priceTiers":[{"qty":1,"price":"$2.87000","currency":"USD"},{"qty":10,"price":"$2.58000","currency":"USD"},{"qty":25,"price":"$2.43960","currency":"USD"},{"qty":100,"price":"$2.11430","currency":"USD"},{"qty":250,"price":"$2.00584","currency":"USD"},{"qty":500,"price":"$1.79984","currency":"USD"},{"qty":1000,"price":"$1.51793","currency":"USD"},{"qty":2500,"price":"$1.44203","currency":"USD"},{"qty":5000,"price":"$1.38782","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3bec1e5f7e1b895920d2dc564cc937ef.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L6981C33DR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for L6981C33DR?","answer":"The L6981N33DR is a near-identical peer: same 1.5 A output, same 3.3 V fixed voltage, same 400 kHz switching and synchronous rectifier. The difference is the package suffix — the 'C' variant comes in an 8-SOIC, while the 'N' variant is in an 8-SO with a different lead-frame finish. Electrically they are drop-in replacements on the same PCB footprint, but confirm the solder-joint inspection criteria if your assembly house specifies the lead-frame material."},{"question":"What compliance documentation does STMicroelectronics provide for L6981C33DR?","answer":"The part is ROHS3 compliant per the manufacturer's declaration. No UL, IEC, or AEC-Q100 qualification is stated in the available records — this is a standard industrial-grade part, not an automotive or safety-certified device. For material declarations or REACH/SVHC data, request the STMicroelectronics compliance certificate at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L6981C33DR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L6981C33DR 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}}