{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843DR-8","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843DR-8","canonicalUrl":"https://icboms.com/texas-instruments/UC3843DR-8","factsUrl":"https://icboms.com/api/mcp/products/UC3843DR-8","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843DR-8 switching controller, 8-SOIC package, current-mode PWM controller supporting boost, buck, buck-boost, flyback, and forward topologies, up to 500 kHz switching frequency, 97% max duty cycle, single output, commercial temperature range 0°C to 70°C.","salesMarkdown":"## Current-mode PWM controller in 8-SOIC The Texas Instruments UC3843DR-8 is a current-mode PWM switching controller designed for step-up, step-down, and step-up/step-down converter topologies including boost, buck, buck-boost, flyback, and forward converters. It drives a single transistor output and operates as a positive, isolation-capable controller—the standard architecture for offline flyback supplies using optocoupler feedback. Switching frequency reaches up to 500 kHz, allowing smaller magnetics than lower-frequency siblings. The 97% maximum duty cycle gives headroom for low-dropout flyback designs where the on-time dominates the period. No clock sync and no synchronous rectifier drive, so this is a conventional controller for cost-sensitive or mid-complexity power stages. That is the commercial band — office equipment, appliance PSUs, indoor wall adapters. 8-SOIC (3.90 mm body width) surface-mount package.","metaTitle":"UC3843DR-8 PWM Controller, 8-SOIC, Up to 500 kHz","metaDescription":"Texas Instruments UC3843DR-8 switching controller in 8-SOIC. Supports boost, buck, buck-boost, flyback, forward topologies. 97% duty cycle, up to 500 kHz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"Not applicable","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, 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":"-","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5700","priceTiers":[{"qty":525,"price":"$0.57000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/92a6b8a86ef636383bed55497cb57a32.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843DR-8/alternatives.json"},"ai":{"faq":[{"question":"What is the UC3843DR-8's listed function?","answer":"The UC3843DR-8 is a switching controller (current-mode PWM) with step-up, step-down, and step-up/step-down capability. It supports boost, buck, buck-boost, flyback, and forward converter topologies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843DR-8","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843DR-8 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}}