{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC2843N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC2843N","canonicalUrl":"https://icboms.com/texas-instruments/UC2843N","factsUrl":"https://icboms.com/api/mcp/products/UC2843N","rawCanonicalId":null},"summary":{"shortDescription":"UC2843N, Texas Instruments, Current-Mode PWM Controller, Boost/Buck/Flyback/Forward, Up to 500kHz, 97% Duty Cycle, 12V-28V Supply, Through Hole 8-PDIP, -40°C to 85°C.","salesMarkdown":"## What the UC2843N is and where it fits The Texas Instruments UC2843N is a current-mode PWM controller for off-line and DC-DC converters. It handles step-up, step-down, and step-up/step-down topologies including boost, buck, buck-boost, flyback, and forward. ## Key ratings and what they mean for the BOM The 97% maximum duty cycle is the headline figure for this controller family. It allows the part to maintain regulation with very low input-to-output voltage ratios — useful in boost converters where the output is only slightly above the input, or in flyback designs that need a long on-time to store energy in the transformer. The 12V to 28V supply range (Vcc) lines up with standard 24V industrial buses and off-line bias windings from a transformer auxiliary winding. Operating temperature from -40°C to 85°C covers most factory-floor, outdoor telecom, and engine-bay environments without stepping up to a military-grade part. ## Lifecycle and sourcing reality The UC2843N carries an Active lifecycle status with ROHS3 compliance.","metaTitle":"UC2843N PWM Controller, 500kHz, 97% Duty Cycle, 8-PDIP","metaDescription":"UC2843N current-mode PWM controller. Up to 500kHz switching, 97% max duty cycle, 12V-28V supply. Through-hole 8-PDIP. Active, ROHS3.","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":"Through Hole","Output Phases":"1","Package / Case":"8-DIP (0.300\\\", 7.62mm)","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":"8-PDIP","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.74","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.74000","currency":"USD"},{"qty":10,"price":"$1.55900","currency":"USD"},{"qty":25,"price":"$1.47080","currency":"USD"},{"qty":100,"price":"$1.25310","currency":"USD"},{"qty":250,"price":"$1.17660","currency":"USD"},{"qty":500,"price":"$1.02952","currency":"USD"},{"qty":1000,"price":"$0.85304","currency":"USD"},{"qty":2500,"price":"$0.83250","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC2843N?","answer":"The maximum duty cycle is 97%, which allows near-continuous on-time for low dropout ratio designs in boost or flyback topologies."},{"question":"What is the maximum switching frequency of UC2843N?","answer":"Switching frequency runs up to 500 kHz, enabling smaller transformer and filter component sizes compared to 100 kHz-class controllers."},{"question":"Is UC2843N equivalent to UC3843?","answer":"The UC2843N is the industrial-temperature-range sibling of the UC3843 family. Both share the same pinout and functional behavior; the key difference is the UC2843N's -40°C to 85°C rating versus the UC3843's commercial 0°C to 70°C range."},{"question":"What is UC2843N used for?","answer":"It is a current-mode PWM controller for DC-DC converters and off-line power supplies using boost, buck, buck-boost, flyback, or forward topologies. Typical applications include industrial power supplies, battery chargers, and auxiliary bias supplies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC2843N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC2843N 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}}