{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2843D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC2843D","canonicalUrl":"https://icboms.com/texas-instruments/UC2843D","factsUrl":"https://icboms.com/api/mcp/products/UC2843D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC2843D, current-mode PWM controller, Step-Up/Step-Down/Step-Up/Step-Down, Boost/Buck/Buck-Boost/Flyback/Forward topologies, single output, up to 500kHz switching, 97% max duty cycle, 12V~28V supply, -40°C~85°C, 14-SOIC, Tube.","salesMarkdown":"## What the UC2843D is and where it fits Switching frequency goes up to 500 kHz, which lets you shrink the transformer and output filter — useful when board space is the constraint. The 97% max duty cycle gives you headroom for wide-ratio boost or flyback stages without the controller dropping pulses on you. Operating temperature from -40°C to 85°C covers factory-floor gear, outdoor telecom cabinets, and ventilated enclosures — not automotive under-hood, but solid for industrial. ## Lifecycle and sourcing reality The UC2843D carries an Active lifecycle status and ROHS3 compliance. No last-time-buy clock ticking, no end-of-life notice to chase. ## Flyback suitability — the scorch-mark test Yes, the UC2843D supports flyback topology. Current-mode control provides cycle-by-cycle current limiting. Switching up to 500 kHz and 97% duty cycle suit single-ended flyback designs.","metaTitle":"UC2843D PWM Controller, 500kHz, 14-SOIC, Active","metaDescription":"UC2843D is a current-mode PWM controller supporting boost, buck, flyback, forward topologies. Up to 500kHz switching, 97% duty cycle, -40°C to 85°C.","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":"Boost, Buck, Buck-Boost, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"97%","Number of Outputs":"1","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.56","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.56000","currency":"USD"},{"qty":10,"price":"$1.40400","currency":"USD"},{"qty":25,"price":"$1.32480","currency":"USD"},{"qty":100,"price":"$1.12890","currency":"USD"},{"qty":250,"price":"$1.06000","currency":"USD"},{"qty":500,"price":"$0.92750","currency":"USD"},{"qty":1000,"price":"$0.76850","currency":"USD"},{"qty":2500,"price":"$0.75000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is UC2843D suitable for a flyback converter?","answer":"Yes. The UC2843D supports flyback topology, offers current-mode control with cycle-by-cycle limiting, switches up to 500 kHz, and provides up to 97% duty cycle — all well-suited for single-ended flyback designs in the 10 W to 150 W range."},{"question":"What is the maximum switching frequency of UC2843D?","answer":"The UC2843D switches up to 500 kHz. That ceiling lets you use smaller magnetics and output capacitors compared to 100 kHz controllers, at the cost of higher switching losses in the MOSFET."},{"question":"What is the UC2843D vs UC2845 difference?","answer":"The primary difference is the duty cycle clamp: the UC2843D allows up to 97% duty cycle, while the UC2845 clamps at 50%. Pinout and undervoltage lockout thresholds are the same. Choose the UC2843D for boost, flyback, or forward converters that need wide pulses; choose the UC2845 for push-pull or half-bridge topologies requiring 50% symmetry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC2843D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC2843D 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}}