{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3856DW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3856DW","canonicalUrl":"https://icboms.com/texas-instruments/UC3856DW","factsUrl":"https://icboms.com/api/mcp/products/UC3856DW","rawCanonicalId":null},"summary":{"shortDescription":"Unitrode (TI) UC3856DW current-mode PWM controller, 16-SOIC, 200kHz switching, 47% max duty cycle, synchronous rectification, 7V–40V supply, 0°C–70°C.","salesMarkdown":"## PWM controller for multi-topology power stages The Unitrode (now Texas Instruments) UC3856DW is a current-mode PWM controller that handles step-up, step-down, and step-up/step-down conversion across buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull topologies. Two transistor-driver outputs run at up to 200 kHz with a maximum duty cycle of 47% — the hard ceiling for transformer-reset in single-ended forward converters. Synchronous rectification drive is built in, which saves a Schottky pair on low-voltage output rails. Supply range is 7 V to 40 V, and control features include enable, frequency control, and soft start. ## 200 kHz switching and 47% duty — what they mean for the power stage The 200 kHz switching ceiling sets the transformer and inductor sizing trade-off. The 47% max duty cycle guarantees the reset winding in a single-ended forward converter has enough off-time to demagnetize the core before the next cycle. ## Temperature grade and package constraints Rated for 0°C to 70°C ambient — commercial temperature grade. That means indoor, non-condensing environments only: bench supplies, telecom rack cards, office equipment. Not rated for motor drives, outdoor telecom cabinets, or under-hood automotive. The 16-SOIC (0.295-inch body width, 7.50 mm) is a standard surface-mount footprint. ## Lifecycle and sourcing Listed as Active and ROHS3 compliant. For BOM planning, the active status means no last-time-buy risk in the near term.","metaTitle":"UC3856DW PWM Controller, 200kHz, 16-SOIC, Active","metaDescription":"UC3856DW current-mode PWM controller from Unitrode/TI. Supports buck, boost, flyback, forward, bridge topologies. 200kHz switching, sync rect, 47% max duty.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Function":"Step-Up, Step-Down, Step-Up/Step-Down","Topology":"Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Control Features":"Enable, Frequency Control, Soft Start","Duty Cycle (Max)":"47%","Number of Outputs":"2","Output Configuration":"Positive","Frequency - Switching":"200kHz","Operating Temperature":"0°C ~ 70°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-SOIC","Voltage - Supply (Vcc/Vdd)":"7V ~ 40V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.63","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.63000","currency":"USD"},{"qty":10,"price":"$5.95400","currency":"USD"},{"qty":25,"price":"$5.62880","currency":"USD"},{"qty":100,"price":"$4.87810","currency":"USD"},{"qty":250,"price":"$4.62796","currency":"USD"},{"qty":500,"price":"$4.15266","currency":"USD"},{"qty":1000,"price":"$3.54000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/93b249a7baa68386d050170010e0f1b4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What topologies does the UC3856DW support?","answer":"It supports buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull topologies — covering step-up, step-down, and step-up/step-down conversion."},{"question":"Does UC3856DW support synchronous rectification?","answer":"Yes, synchronous rectifier drive is built in, which allows replacing output Schottky diodes with MOSFETs for higher efficiency in low-voltage rails."},{"question":"What are the equivalent or replacement parts for UC3856DW?","answer":"The closest functional peer is the UCC2806DWTR, which also runs in boost, flyback, and forward converter topologies with two outputs and synchronous rectification, but its switching frequency is 47 kHz and it lacks clock sync. For automotive or higher-temperature designs, the LM5150QURUMRQ1 (AEC-Q100, -40°C to 150°C) is a boost-only controller with clock sync but no synchronous rectification. Neither is a direct pin-compatible drop-in; verify the control feature set and pinout before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3856DW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3856DW 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}}