{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844AD8G4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3844AD8G4","canonicalUrl":"https://icboms.com/texas-instruments/UC3844AD8G4","factsUrl":"https://icboms.com/api/mcp/products/UC3844AD8G4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3844AD8G4, current-mode PWM controller, 48% max duty cycle, up to 500 kHz switching, 10V-30V supply, 8-SOIC package, 0°C to 70°C.","salesMarkdown":"## 48% duty cycle — the flyback/forward ceiling The UC3844AD8G4 is a current-mode PWM controller from Texas Instruments designed for step-up, step-down, step-up/step-down topologies including boost, buck, flyback, and forward converters. Its 48% maximum duty cycle is the hard limit that sets the transformer turns ratio and output voltage range in isolated flyback and forward designs — push past it and the controller skips pulses. ## Switching up to 500 kHz — magnetics shrink, layout tightens Switching frequency reaches up to 500 kHz, which lets you downsize the transformer and output filter capacitors. At these speeds the gate-drive loop and sense resistor layout become critical — a few nanohenries of stray inductance in the current-sense path can shift the cycle-by-cycle limit. The controller does not include clock synchronisation, so multiple converters on the same board need external beat-frequency management. The undervoltage lockout thresholds are set inside that window — the controller stays off until Vcc rises above the start threshold and shuts down cleanly when it drops. Output configuration is positive, isolation-capable, with a single transistor-driver output.","metaTitle":"UC3844AD8G4 PWM Controller, 48% Duty Cycle, 500 kHz, 8-SOIC","metaDescription":"UC3844AD8G4 current-mode PWM controller from TI. 48% max duty cycle, up to 500 kHz switching, 10V-30V supply. 8-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":"Tube","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":"8-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":"UC3844","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/72463d7c352ecebe0441deb1ec8c852d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844AD8G4/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC3844AD8G4?","answer":"The maximum duty cycle is 48%. This is a fixed limit — the controller will not produce pulses wider than 48% of the switching period, which constrains the transformer turns ratio in flyback and forward designs."},{"question":"What is the difference between UC3844AD8G4 and UC3844AD?","answer":"The UC3844AD8G4 is the 8-SOIC surface-mount variant of the UC3844AD. The 'G4' suffix denotes a lead-free, RoHS-compliant finish. Functionally they are identical — same 48% duty cycle, same 500 kHz switching, same 10 V to 30 V supply range. The package is the only difference."},{"question":"How can I get current pricing and availability for UC3844AD8G4?","answer":"Submit an RFQ through this listing — availability and current pricing will be provided for your target quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3844AD8G4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3844AD8G4 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}}