{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844D8TRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3844D8TRG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3844D8TRG4","factsUrl":"https://icboms.com/api/mcp/products/UC3844D8TRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3844D8TRG4 current-mode PWM controller, 48% max duty cycle, up to 500 kHz switching, 12V to 28V supply, 8-SOIC surface-mount package, 0°C to 70°C commercial temperature range.","salesMarkdown":"The UC3844D8TRG4 is a current-mode PWM controller from Texas Instruments, built for single-ended topologies — boost, buck, buck-boost, flyback, and forward converters. Its 48% maximum duty cycle is the hard stop that defines the transformer turns ratio and output regulation range in isolated designs; a flyback winding that needs more than 48% on-time at minimum input voltage forces a different controller or a two-switch topology. The part switches up to 500 kHz, letting you shrink the magnetic core and output capacitor relative to 100 kHz designs, but that edge frequency demands careful layout — the sense resistor and gate-drive loop parasitics become the limit. ## Supply rails and temperature — where this part fits the BOM Vcc range of 12 V to 28 V covers the common bias rail from an auxiliary flyback winding or a bootstrap supply in a buck converter — no extra linear regulator needed in most offline AC-DC designs. TI lists the UC3844D8TRG4 as Active.","metaTitle":"UC3844D8TRG4 PWM Controller, 48% Duty, 500 kHz, 8-SOIC","metaDescription":"Texas Instruments UC3844D8TRG4 current-mode PWM controller. Step-up/down/flyback/forward topology, 48% max duty cycle, up to 500 kHz, 12V-28V supply, 8-SOIC.","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":"Tape & Reel (TR)","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":"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)":"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/UC3844D8TRG4/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between UC3844 and UC3842?","answer":"The primary parametric difference is the maximum duty cycle. The UC3844 family is clamped at 48% duty cycle, while the UC3842 family allows up to 96% duty. Both are current-mode PWM controllers in the same pin-compatible 8-pin SOIC footprint, but the 48% ceiling on the UC3844 limits its use to flyback and forward converters where the transformer reset time demands a duty cycle below 50%. The UC3842 is the part to choose for boost or push-pull topologies that need a wider on-time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3844D8TRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3844D8TRG4 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}}