{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843AD-F","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843AD-F","canonicalUrl":"https://icboms.com/texas-instruments/UC3843AD-F","factsUrl":"https://icboms.com/api/mcp/products/UC3843AD-F","rawCanonicalId":null},"summary":{"shortDescription":"onsemi UC3843AD-F current-mode PWM controller, 14-SOIC surface-mount package, 96% max duty cycle, switching frequency up to 500kHz, 7.6V to 30V supply range, 0°C to 70°C operating temperature.","salesMarkdown":"## Current-mode PWM controller for flyback and boost converters The onsemi UC3843AD-F is a current-mode PWM controller designed for step-up, step-down, and step-up/step-down topologies including boost, buck, flyback, and forward converters. It drives a single external MOSFET through a transistor driver output, with the switching frequency programmable up to 500 kHz. The 96% maximum duty cycle is the key parametric for flyback and boost designs where the output voltage must be significantly higher than the input — it determines the transformer turns ratio and the minimum input voltage the converter can regulate down to. The 7.6V undervoltage lockout threshold means this controller requires a bias rail above 7.6V to start; a 5V-only system will need a separate bias supply or a different controller with a lower UVLO. ## 14-SOIC surface-mount package and temperature grade Housed in a 14-SOIC (0.154\" width, 3.90 mm body) surface-mount package, the UC3843AD-F is suited for automated PCB assembly. The part is — verify the reel or tube quantity with your distributor when ordering production volumes, as the Bulk option may ship as loose parts in a bag rather than on a tape-and-reel carrier.","metaTitle":"UC3843AD-F PWM Controller, 96% Duty Cycle, 500kHz, 14-SOIC","metaDescription":"UC3843AD-F current-mode PWM controller from onsemi. 96% max duty cycle, up to 500kHz switching, 7.6V-30V supply. Active production, 14-SOIC package.","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":"Bulk","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":"14-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"96%","Number of Outputs":"1","Serial Interfaces":"-","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)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/38ca8aa39260ed782b2be6d143cc4be8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843AD-F/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC3843AD-F?","answer":"The maximum duty cycle is 96%, which allows the controller to operate with a very wide input-to-output voltage ratio in boost and flyback topologies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843AD-F","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843AD-F 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}}