{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3845D8TR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3845D8TR","canonicalUrl":"https://icboms.com/texas-instruments/UC3845D8TR","factsUrl":"https://icboms.com/api/mcp/products/UC3845D8TR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3845D8TR, current-mode PWM controller, 8-SOIC package, switching frequency up to 500 kHz, 48% max duty cycle, 12 V to 28 V supply.","salesMarkdown":"## Current-mode PWM controller for single-ended topologies The UC3845D8TR is a fixed-frequency current-mode PWM controller from TI, designed for boost, buck, buck-boost, flyback, and forward converters. It delivers a single transistor-driver output with a maximum duty cycle of 48% — the clamp prevents transformer saturation in single-ended designs. Switching frequency reaches up to 500 kHz, allowing smaller magnetic components and higher power density in the converter. The controller operates from a supply voltage of 12 V to 28 V, making it compatible with typical bias rails derived from auxiliary windings or linear regulators. ## Duty-cycle clamp and frequency control The 48% duty-cycle maximum is a hard limit — essential for flyback converters where the primary-side on-time must stay below 50% to reset the transformer core. Exceeding this risks saturation and primary-side switch failure. Frequency control is available as a control feature, allowing the oscillator timing to be set by an external resistor and capacitor. No clock-sync input is provided, so multiple converters must free-run or use external synchronization via the RT/CT pin. ## Active production, 8-SOIC package Supplied in Tape & Reel (TR) or Cut Tape (CT) options, in an 8-SOIC (0.154\", 3.90 mm width) surface-mount package. The 8-SOIC footprint is widely second-sourced and easy to lay out on two-layer boards. Not suitable for extended industrial or automotive environments without thermal qualification.","metaTitle":"UC3845D8TR – Texas Instruments Current-Mode PWM Controller","metaDescription":"UC3845D8TR from TI: Active current-mode PWM controller, up to 500 kHz, 48% duty cycle, 12-28 V supply, 8-SOIC. Sourced per RFQ.","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)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3845","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/UC3845D8TR/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between UC3845 and UC3845D8TR?","answer":"The UC3845D8TR is the Tape & Reel packaged variant of the base UC3845. The base UC3845 is typically supplied in tube or bulk; the D8TR suffix indicates 8-SOIC package on tape-and-reel. Electrical specifications are identical."},{"question":"Can UC3845D8TR be used in a flyback converter?","answer":"Yes, the 48% maximum duty cycle is specifically designed for single-ended topologies like flyback and forward converters, where the duty cycle must stay below 50% to reset the transformer core."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3845D8TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3845D8TR 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}}