{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UCC28703DBVT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UCC28703DBVT","canonicalUrl":"https://icboms.com/texas-instruments/UCC28703DBVT","factsUrl":"https://icboms.com/api/mcp/products/UCC28703DBVT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UCC28703DBVT offline flyback controller, SOT-23-6 package, 21 V startup, 1 kHz ~ 130 kHz switching, isolated output, no internal switch, current limiting and overvoltage protection, -20°C to 125°C junction temperature.","salesMarkdown":"## What this part is and where it fits The Texas Instruments UCC28703DBVT is an offline flyback controller designed for isolated AC-DC power supplies. It operates from a Vcc range of 9 V to 35 V with a startup threshold of 21 V, and switches between 1 kHz and 130 kHz. The controller drives an external MOSFET — there is no internal power switch. Typical applications include chargers, adapters, and auxiliary housekeeping supplies where isolation is required. ## Key ratings and what they mean for the BOM The 21 V startup voltage sets the bias winding and bulk capacitor design. The 1 kHz to 130 kHz switching range supports valley-switching or quasi-resonant operation, which helps manage EMI and light-load efficiency. Because the controller has no internal switch, the designer must select an external MOSFET and budget for its gate drive — this is the dominant BOM cost alongside the transformer. Fault protection includes current limiting and overvoltage shutdown, which simplifies the secondary-side feedback loop and reduces external component count. The -20°C to 125°C junction temperature range covers industrial and outdoor telecom environments. ## Sourcing and lifecycle There is no end-of-life notice, and the part is available through independent distribution. For current pricing and availability, submit an RFQ — lead times and stock levels are confirmed at quote time.","metaTitle":"UCC28703DBVT Offline Flyback Controller, SOT-23-6","metaDescription":"UCC28703DBVT is an isolated flyback controller from TI in SOT-23-6. 21V startup, 1kHz-130kHz switching, requires external MOSFET. Active, ROHS3.","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)","Topology":"Flyback","Mounting Type":"Surface Mount","Package / Case":"SOT-23-6","lifecycle_stage":"eol_hot","Fault Protection":"Current Limiting, Over Voltage","Output Isolation":"Isolated","Internal Switch(s)":"No","Voltage - Start Up":"21 V","Frequency - Switching":"1kHz ~ 130kHz","Operating Temperature":"-20°C ~ 125°C (TJ)","Supplier Device Package":"SOT-23-6","Voltage - Supply (Vcc/Vdd)":"9V ~ 35V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.62","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.62000","currency":"USD"},{"qty":10,"price":"$1.44500","currency":"USD"},{"qty":25,"price":"$1.37120","currency":"USD"},{"qty":100,"price":"$1.12640","currency":"USD"},{"qty":250,"price":"$1.05288","currency":"USD"},{"qty":500,"price":"$0.93046","currency":"USD"},{"qty":1250,"price":"$0.73458","currency":"USD"},{"qty":2500,"price":"$0.69300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/53f0186d317d14511e940131cacb4255.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does UCC28703DBVT require an external MOSFET?","answer":"Yes. The controller has no internal switch, so an external MOSFET must be added to the BOM. The gate drive is designed for standard power MOSFETs."},{"question":"What is the replacement or equivalent for UCC28703DBVT?","answer":"TI lists the UCC28703DBVT as an active product with no direct replacement. For a pin-compatible alternative within the same family, review the UCC28700 series — confirm the startup voltage and fault protection match your design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UCC28703DBVT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UCC28703DBVT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}