{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843D8TR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843D8TR","canonicalUrl":"https://icboms.com/texas-instruments/UC3843D8TR","factsUrl":"https://icboms.com/api/mcp/products/UC3843D8TR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843D8TR current-mode PWM controller, boost/buck/flyback/forward topology, up to 500 kHz switching frequency, 97% duty cycle, 12-28 V supply, 8-SOIC, 0°C to 70°C.","salesMarkdown":"## UC3843D8TR — current-mode PWM controller for multi-topology supplies The Texas Instruments UC3843D8TR is a current-mode PWM controller that handles step-up, step-down, and step-up/step-down topologies — boost, buck, buck-boost, flyback, and forward converter designs all run off this one controller IC. It drives a single external transistor (Transistor Driver output) and supports positive output configurations with isolation capability. Switching frequency runs up to 500 kHz. The 97% maximum duty cycle is unusually high. The Vcc range is 12 V to 28 V. That suits indoor power supplies, telecom bricks, appliance PSUs, and bench equipment. For outdoor telecom cabinets, engine-bay converters, or industrial motor drives, you would step up to an industrial- or automotive-grade PWM controller — this part stays in conditioned environments.","metaTitle":"UC3843D8TR PWM Controller, Up to 500 kHz, 97% Duty Cycle","metaDescription":"UC3843D8TR current-mode PWM controller from TI. Switching frequency up to 500 kHz, 97% max duty cycle, 12-28 V supply, 8-SOIC. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","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)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"97%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3843","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":"$1.3600","priceTiers":[{"qty":1,"price":"$1.36000","currency":"USD"},{"qty":10,"price":"$1.21600","currency":"USD"},{"qty":25,"price":"$1.15440","currency":"USD"},{"qty":100,"price":"$0.94840","currency":"USD"},{"qty":250,"price":"$0.88652","currency":"USD"},{"qty":500,"price":"$0.78344","currency":"USD"},{"qty":1000,"price":"$0.61851","currency":"USD"},{"qty":2500,"price":"$0.58350","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843D8TR/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum duty cycle and switching frequency of UC3843D8TR?","answer":"The maximum duty cycle is 97%, and the switching frequency runs up to 500 kHz. The high duty cycle supports low-dropout boost operation and large step-down ratios."},{"question":"What are the main alternatives or cross references for UC3843D8TR?","answer":"A functional alternative is the UCC2806DWTR, also a current-mode PWM controller in an 8-SOIC package. Key differences: the UCC2806 has a 50% duty cycle limit, dual outputs, synchronous rectifier capability, and an extended temperature range of -40°C to 85°C. It trades the UC3843's high duty cycle for dual-phase or synchronous capability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843D8TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843D8TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}