{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3845BD1013TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"UC3845BD1013TR","canonicalUrl":"https://icboms.com/stmicroelectronics/UC3845BD1013TR","factsUrl":"https://icboms.com/api/mcp/products/UC3845BD1013TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics UC3845BD1013TR, current-mode PWM controller for boost and flyback topologies, single output transistor driver, 8-SOIC package, switching frequency up to 500 kHz, supply range 7.6V to 30V.","salesMarkdown":"The UC3845BD1013TR is a current-mode PWM controller from STMicroelectronics designed for boost and flyback converter topologies. It drives a single external power transistor and includes frequency control for oscillator trimming. The 7.6V to 30V supply range lets it run directly off a 12V or 24V industrial bus without a pre-regulator, and the -40°C to 150°C junction temperature covers both outdoor telecom cabinets and under-hood automotive auxiliary supplies. ## Switching frequency and duty-cycle limits Switching frequency is programmable up to 500 kHz via an external RC timing network. Higher frequencies reduce transformer and capacitor size but increase switching losses — a typical flyback for a 10–20 W auxiliary rail runs at 100–200 kHz to balance magnetics volume against thermal budget. Maximum duty cycle is 48%, which limits the step-up ratio in boost converters and the reflected voltage in flyback designs. The 48% cap keeps transformer reset margin in single-ended topologies without requiring a separate reset winding. 8-SOIC (0.154-inch, 3.90 mm width) surface-mount package. The 1.27 mm pin pitch is layout-friendly for two-layer boards, and the body width matches the standard SOIC-8 land pattern used across the industry. The 150°C TJ max is typical for junction-rated controllers — the ambient ceiling depends on the thermal resistance of the board.","metaTitle":"UC3845BD1013TR – STMicro Boost/Flyback Controller, 8-SOIC","metaDescription":"STMicroelectronics UC3845BD1013TR current-mode PWM controller. Boost/flyback topology, up to 500 kHz switching, 7.6V–30V supply, -40°C to 150°C TJ.","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)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3845","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"-40°C ~ 150°C (TJ)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0200","priceTiers":[{"qty":1,"price":"$1.02000","currency":"USD"},{"qty":10,"price":"$0.91600","currency":"USD"},{"qty":25,"price":"$0.86960","currency":"USD"},{"qty":100,"price":"$0.71430","currency":"USD"},{"qty":250,"price":"$0.66772","currency":"USD"},{"qty":500,"price":"$0.59010","currency":"USD"},{"qty":1000,"price":"$0.46586","currency":"USD"},{"qty":2500,"price":"$0.43480","currency":"USD"},{"qty":5000,"price":"$0.41306","currency":"USD"},{"qty":12500,"price":"$0.39754","currency":"USD"},{"qty":25000,"price":"$0.38511","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a1e92e6bbc45d0f8e3020163c44f39c7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3845BD1013TR/alternatives.json"},"ai":{"faq":[{"question":"How can I order UC3845BD1013TR or request a quote?","answer":"Submit an RFQ through this page with your target quantity and target price. The part is Active in production; we source against your BOM line from distribution channels and confirm availability and current pricing at quote time. No stock-holding claim is made here — every order is sourced to your requirement."},{"question":"What is the closest pin-compatible alternative to UC3845BD1013TR in the same family?","answer":"The UC3845 family includes several duty-cycle and under-voltage-lockout variants. The UC3845BD1013TR is the 8-SOIC reel version with a 48% max duty cycle and a 7.6V–30V supply. A direct sibling is the UC3845BD1 (same die in SOIC-8, tube packaging). For a different UVLO threshold, the UC3842/3/4/5 family provides multiple options — confirm the turn-on/turn-off thresholds against your input rail before substituting."},{"question":"What is the switching frequency range of UC3845BD1013TR?","answer":"The oscillator runs up to 500 kHz, set by an external resistor and capacitor. The datasheet provides the RC product vs. frequency curves; a typical 100 kHz design uses a 10 kΩ resistor and a 1 nF capacitor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/UC3845BD1013TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/UC3845BD1013TR 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}}