{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3845ADWTRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3845ADWTRG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3845ADWTRG4","factsUrl":"https://icboms.com/api/mcp/products/UC3845ADWTRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3845ADWTRG4, current-mode PWM controller, 48% max duty cycle, up to 500 kHz switching, 7.6 V to 30 V supply, 16-SOIC, 0°C to 70°C.","salesMarkdown":"## Current-mode PWM controller — why the 48% duty cycle matters The UC3845ADWTRG4 has a 48% maximum duty cycle. In a flyback converter, that limit sets the transformer turns ratio and the reflected voltage across the primary switch. ## Switching frequency and supply voltage — the operating envelope The controller switches at up to 500 kHz. The 48% duty cycle applies at any frequency within that range. A pin-compatible alternative within the UC3845 family would need to be verified against the specific supply and duty-cycle requirements of your application.","metaTitle":"UC3845ADWTRG4 PWM Controller, 48% Duty Cycle, 500 kHz","metaDescription":"Texas Instruments UC3845ADWTRG4 PWM current-mode controller. 48% max duty cycle, up to 500 kHz switching, 7.6 V to 30 V supply. 16-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Boost, Buck, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC384","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"16-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ec0c47fb2b38012b7f304dde70743f4d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3845ADWTRG4/alternatives.json"},"ai":{"faq":[{"question":"Can UC3845ADWTRG4 be used in a buck converter?","answer":"Yes, the UC3845ADWTRG4 supports buck topology. The 48% maximum duty cycle limits the step-down ratio — for a 12 V input, the minimum output voltage is roughly 5.8 V at 48% duty, assuming continuous conduction mode. A higher step-down ratio requires a higher-duty-cycle controller."},{"question":"What is the difference between UC3845ADW and UC3845ADWTRG4?","answer":"The UC3845ADW and UC3845ADWTRG4 are the same silicon in the same 16-SOIC package. The suffix TRG4 indicates tape-and-reel packaging; UC3845ADW ships in tube or tray. Both are obsolete."},{"question":"What is the duty cycle of UC3845ADWTRG4?","answer":"The maximum duty cycle is 48%. This is a fixed limit for the UC3845 variant; the UC3844 offers a 50% maximum, and the UC3846 goes above 50%."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3845ADWTRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3845ADWTRG4 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}}