{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843BD1013TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"UC3843BD1013TR","canonicalUrl":"https://icboms.com/stmicroelectronics/UC3843BD1013TR","factsUrl":"https://icboms.com/api/mcp/products/UC3843BD1013TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics UC3843BD1013TR, a current-mode PWM controller in 8-SOIC, step-up/step-up-step-down function, boost/flyback topology, up to 500 kHz switching, 96% max duty cycle, 0°C to 70°C operation.","salesMarkdown":"## Active production — sourcing for your BOM line That gives procurement a stable supply horizon for production builds. It is ROHS3 compliant, clearing the restriction-of-hazardous-substances gate for EU and most global markets. ## Boost and flyback controller — key switching specs This is a single-output, current-mode PWM controller built for boost and flyback topologies. The 96% maximum duty cycle lets it maintain regulation across a wide input-to-output voltage ratio, which matters for designs like an offline flyback where the primary-to-secondary turns ratio demands a long on-time. Switching frequency goes up to 500 kHz. That is high enough to shrink the magnetic component (transformer or boost inductor) to a small surface-mount part, but the trade-off is higher switching loss in the external MOSFET — the designer should budget gate-drive power accordingly. Supply voltage range is 7.6 V to 30 V on the Vcc pin. That 7.6 V minimum means the chip needs a bias rail above the undervoltage-lockout threshold before it starts switching — a common startup resistor and auxiliary winding arrangement handles it in a flyback. ## Temperature grade sets the application boundary This is a commercial-grade part — fine for an indoor power supply, a telecom adapter, or a white-goods control board. It will not meet the -40°C requirement of an automotive or outdoor industrial design. Reflow profile is the usual lead-free SOIC profile; the part has no exposed pad, so the die heat flows through the leads and into the copper traces — a short, wide trace from pin 5 (ground) helps pull heat away. ## Rework note — 8-SOIC is a clean lift The 8-SOIC package is one of the easiest to rework by hand. The 0.154-inch (3.90 mm) body width means the leads are spaced wide enough to flood with solder wick without bridging. Because the part lacks a thermal pad underneath, there is no risk of hidden voids or cold joints under the body. A standard hot-air nozzle at 300°C with a 3-second dwell lifts the part cleanly — just work the wick across each side and the pads come up flat.","metaTitle":"UC3843BD1013TR STMicroelectronics Boost/Flyback Controller","metaDescription":"Active STMicroelectronics UC3843BD1013TR PWM controller. Boost/flyback topology, 96% duty cycle, up to 500 kHz switching. 8-SOIC, ROHS3. 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":"STMicroelectronics","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback","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)":"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(TJ)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0800","priceTiers":[{"qty":1,"price":"$1.08000","currency":"USD"},{"qty":10,"price":"$0.96200","currency":"USD"},{"qty":25,"price":"$0.91280","currency":"USD"},{"qty":100,"price":"$0.74970","currency":"USD"},{"qty":250,"price":"$0.70080","currency":"USD"},{"qty":500,"price":"$0.61930","currency":"USD"},{"qty":1000,"price":"$0.53812","currency":"USD"},{"qty":2500,"price":"$0.53812","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a1e92e6bbc45d0f8e3020163c44f39c7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843BD1013TR/alternatives.json"},"ai":{"faq":[{"question":"Is UC3843BD1013TR RoHS compliant?","answer":"Yes, it is ROHS3 compliant per the lifecycle record."},{"question":"Can UC3843BD1013TR replace UC3843BN?","answer":"The UC3843BN is the DIP-8 through-hole version of the same controller die. The UC3843BD1013TR is the surface-mount 8-SOIC variant. Electrically they are the same PWM core — same duty cycle, frequency, and supply range — but the package footprint and reflow process differ. A direct board-level replacement would require a layout change from DIP to SOIC."},{"question":"What is the maximum duty cycle of UC3843BD1013TR?","answer":"The maximum duty cycle is 96%, which allows the controller to maintain regulation even with a high step-up ratio in boost or flyback converters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/UC3843BD1013TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/UC3843BD1013TR 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}}