{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844BD1013TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"UC3844BD1013TR","canonicalUrl":"https://icboms.com/stmicroelectronics/UC3844BD1013TR","factsUrl":"https://icboms.com/api/mcp/products/UC3844BD1013TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics UC3844BD1013TR current-mode PWM controller, boost/flyback topology, up to 500 kHz switching, 48% max duty cycle, 8-SOIC package, 0°C to 70°C.","salesMarkdown":"## Current-mode PWM controller for boost and flyback The STMicroelectronics UC3844BD1013TR is a current-mode PWM controller designed for step-up (boost) and step-up/step-down (flyback) topologies. It drives a single external transistor and includes frequency control, with switching up to 500 kHz. The controller operates from a 10 V to 30 V supply and delivers a maximum duty cycle of 48%, which limits the off-time for transformer reset in flyback converters. The 48% duty-cycle ceiling is the key parametric difference from the UC3842 family (which runs to 96%). In a flyback, the off-time must be long enough to reset the transformer core; 48% ensures the core resets every cycle without saturating. If your design needs more than 48% on-time, this part won't fit — you'd look at the UC3842 or a different controller. Switching up to 500 kHz lets you shrink the transformer and output filter, but the gate-drive losses and snubber design get tighter above 200 kHz. The 8-SOIC package handles the dissipation if you keep the total gate charge of the external MOSFET within the driver's capability. ## Temperature grade and mounting Not suitable for automotive under-hood or industrial extended-temp applications without a temperature-grade upgrade. Surface-mount in the 8-SOIC (3.90 mm width) package. The SOIC footprint is standard; the tape-and-reel option (TR) feeds pick-and-place lines, and the cut-tape (CT) option works for prototype or low-volume builds.","metaTitle":"STMicroelectronics UC3844BD1013TR PWM Controller","metaDescription":"STMicroelectronics UC3844BD1013TR current-mode PWM controller. Boost/flyback topology, up to 500 kHz switching, 48% max duty cycle. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"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":"UC3844","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)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a1e92e6bbc45d0f8e3020163c44f39c7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844BD1013TR/alternatives.json"},"ai":{"faq":[{"question":"Is UC3844BD1013TR obsolete or end-of-life?","answer":"No — the product status is listed as active."},{"question":"What is the difference between UC3844 and UC3842?","answer":"The primary difference is the maximum duty cycle: UC3844 is clamped at 48%, while UC3842 runs up to 96%. The UC3844 is intended for flyback converters where transformer reset requires a guaranteed off-time greater than 50%."},{"question":"Can UC3844BD1013TR be used in a flyback converter?","answer":"Yes — flyback is one of its listed topologies. The 48% duty-cycle limit is specifically designed to ensure the transformer core resets during the off-time in a single-ended flyback."},{"question":"What is the maximum duty cycle of UC3844BD1013TR?","answer":"48% maximum."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/UC3844BD1013TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/UC3844BD1013TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}