{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3845DG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3845DG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3845DG4","factsUrl":"https://icboms.com/api/mcp/products/UC3845DG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3845DG4 current-mode PWM controller, 48% max duty cycle, up to 500 kHz switching, 12V-28V supply, 14-SOIC, 0°C~70°C.","salesMarkdown":"## 48% duty cycle — why it matters for flyback and forward converters Running the duty cycle above 50% in those circuits risks flux walking and core saturation; the 48% ceiling gives the transformer reset time every cycle. ## Switching frequency ceiling and transformer sizing Switching frequency goes up to 500 kHz, which lets you shrink the magnetic components — a 200 kHz vs 100 kHz flyback transformer is roughly half the core volume. The trade-off is switching losses in the MOSFET and the controller's own bias current; at 500 kHz the gate drive losses start to eat into efficiency. Vcc range is 12 V to 28 V, which covers the common 12 V and 24 V industrial bus rails.","metaTitle":"UC3845DG4 PWM Controller, 48% Duty Cycle, 500 kHz, SOIC-14","metaDescription":"UC3845DG4 current-mode PWM controller from TI. 48% max duty cycle, up to 500 kHz switching, 12V-28V supply. Active lifecycle, SOIC-14. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tube","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Boost, Buck, Buck-Boost, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3845","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3845DG4/alternatives.json"},"ai":{"faq":[{"question":"Is UC3845DG4 compatible with the UC3845N?","answer":"The UC3845DG4 is the surface-mount SOIC-14 variant of the UC3845 family. The UC3845N is the DIP-8 version — different package, different pinout. They are not pin-compatible; the board footprint must match the package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3845DG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3845DG4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}