{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843ADTR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843ADTR","canonicalUrl":"https://icboms.com/texas-instruments/UC3843ADTR","factsUrl":"https://icboms.com/api/mcp/products/UC3843ADTR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843ADTR, current-mode PWM controller, Boost/Buck/Flyback/Forward topologies, up to 500 kHz switching, 96% max duty cycle, 7.6 V to 30 V supply, 0°C to 70°C, 14-SOIC.","salesMarkdown":"## Current-mode controller for isolated and non-isolated supplies The Texas Instruments UC3843ADTR is a current-mode PWM controller designed for off-line and DC-DC converters. It supports step-up, step-down, and step-up/step-down topologies including boost, buck, flyback, and forward converters. A single transistor-driver output delivers up to 96% duty cycle, with switching frequency programmable to 500 kHz. The 7.6 V to 30 V supply range covers standard 12 V and 24 V industrial rails directly. The 500 kHz ceiling lets you shrink the magnetic component — a flyback transformer at 300 kHz is roughly half the core volume of one at 100 kHz. The 96% max duty cycle gives headroom for boost converters that need a wide input-to-output ratio, such as a 5 V input to 24 V output. Vcc from 7.6 V to 30 V means the controller can run off a 12 V bias winding or a 24 V industrial bus without a pre-regulator.","metaTitle":"UC3843ADTR PWM Controller, Boost/Buck/Flyback, Up to 500 kHz","metaDescription":"UC3843ADTR current-mode PWM controller. Active production, 14-SOIC. Up to 500 kHz switching, 96% duty cycle, 7.6-30 V supply.","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); Cut Tape (CT)","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":"-","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":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843ADTR/alternatives.json"},"ai":{"faq":[{"question":"Is UC3843ADTR compatible with the standard UC3843?","answer":"Yes, the UC3843ADTR is pin-compatible with the standard UC3843. The 'A' suffix typically denotes tighter tolerance on the reference voltage and oscillator frequency; the 'DTR' suffix indicates tape-and-reel packaging in a 14-SOIC body."},{"question":"What is the maximum switching frequency of UC3843ADTR?","answer":"The controller can be programmed up to 500 kHz. Practical frequency selection depends on the transformer core loss and MOSFET gate charge; above 300 kHz, layout parasitics become the limiting factor."},{"question":"Is UC3843ADTR RoHS compliant?","answer":"The UC3843ADTR is listed as a current-production part from Texas Instruments and is supplied in a lead-free (RoHS-compliant) finish per TI's standard green packaging. No separate RoHS certificate is required for this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843ADTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843ADTR 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}}