{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UCC3809D-1","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UCC3809D-1","canonicalUrl":"https://icboms.com/texas-instruments/UCC3809D-1","factsUrl":"https://icboms.com/api/mcp/products/UCC3809D-1","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UCC3809D-1 offline PWM controller, 1 MHz switching frequency, 70% max duty cycle, 8V–19V supply, 8-SOIC package, -55°C to 150°C TJ, ROHS3 compliant.","salesMarkdown":"## 1 MHz PWM controller for isolated offline supplies The Texas Instruments UCC3809D-1 is a current-mode PWM controller for isolated offline power converters. It supports boost, buck, flyback, and forward topologies, switching at 1 MHz. The 70% maximum duty cycle limits the on-time per cycle, which sets the transformer turns ratio and output voltage range in flyback and forward designs. The 8V to 19V supply range and 15V startup threshold match common bias rails from a bootstrap winding or auxiliary supply. No internal power switch is integrated — the controller drives an external MOSFET through the gate-drive output. ## Temperature grade and deployment environment Rated for a junction temperature range of -55°C to 150°C. The 8-SOIC surface-mount package keeps board area small. ## Control features and design flexibility The UCC3809D-1 includes frequency control and soft-start as control features. Frequency control allows the oscillator to be synchronised or adjusted externally, useful for spread-spectrum EMI reduction or multi-phase interleaving. Soft-start limits inrush during startup, which is critical for designs powering large output capacitors or loads that draw heavy surge current. The part is an isolated controller — the feedback path crosses the isolation barrier via an optocoupler or transformer. ## Sourcing and lifecycle The UCC3809D-1 carries an active lifecycle status with ROHS3 compliance. For BOM freeze or dual-sourcing reviews, the active status means no imminent LTB risk, though the 1 MHz switching frequency and 70% duty cycle should be cross-checked against any candidate alternate for pin compatibility and control-loop compensation.","metaTitle":"UCC3809D-1 PWM Controller, 1MHz, 70% Duty, 8-SOIC","metaDescription":"UCC3809D-1 offline PWM controller from Texas Instruments. 1MHz switching, 70% duty cycle, -55°C to 150°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Topology":"Boost, Buck, Flyback, Forward","Duty Cycle":"70%","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control, Soft Start","Output Isolation":"Isolated","Internal Switch(s)":"No","Voltage - Start Up":"15 V","Frequency - Switching":"1MHz","Operating Temperature":"-55°C ~ 150°C (TJ)","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"8V ~ 19V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.01","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.01000","currency":"USD"},{"qty":10,"price":"$2.70400","currency":"USD"},{"qty":25,"price":"$2.55680","currency":"USD"},{"qty":100,"price":"$2.21580","currency":"USD"},{"qty":250,"price":"$2.10220","currency":"USD"},{"qty":500,"price":"$1.88630","currency":"USD"},{"qty":1000,"price":"$1.60800","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d18b5c2fa7f78de57f45a668b8b69766.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the switching frequency of UCC3809D-1?","answer":"The switching frequency is 1 MHz. This allows small transformer and output filter components but requires careful PCB layout to manage switching losses and noise."},{"question":"What topologies does UCC3809D-1 support?","answer":"The UCC3809D-1 supports boost, buck, flyback, and forward topologies. It is a current-mode controller without an internal switch, so an external MOSFET is required."},{"question":"What is the duty cycle range of UCC3809D-1?","answer":"The maximum duty cycle is 70%. This limits the maximum on-time per cycle, which affects the voltage conversion ratio and transformer design in flyback and forward converters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UCC3809D-1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UCC3809D-1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}