{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843NG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843NG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3843NG4","factsUrl":"https://icboms.com/api/mcp/products/UC3843NG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843NG4, current-mode PWM controller, switching up to 500kHz, 97% max duty cycle, 12V-28V supply, 8-PDIP (0.300\", 7.62mm), through-hole, 0°C~70°C.","salesMarkdown":"## Current-mode PWM controller for isolated and non-isolated topologies The Texas Instruments UC3843NG4 is a current-mode PWM controller designed for step-up, step-down, and step-up/step-down converter topologies including boost, buck, buck-boost, flyback, and forward converters. It drives an external transistor with a single output, rated for switching frequencies up to 500 kHz and a maximum duty cycle of 97%. ## Duty cycle and frequency — sizing the magnetics The 97% maximum duty cycle gives the UC3843NG4 headroom for wide step-down ratios in buck or flyback designs without pulse-skipping at low input voltage. The 500 kHz switching ceiling lets you shrink the transformer or inductor core size compared to 100 kHz controllers, but the trade-off is higher switching losses in the external MOSFET — budget for a gate driver if the total gate charge exceeds 50 nC. ## Supply rail and temperature — where it fits The Vcc range of 12 V to 28 V covers standard 12 V and 24 V industrial buses, plus the auxiliary winding output of a flyback converter. ## Through-hole PDIP — board integration Housed in an 8-pin PDIP (0.300\" width, 7.62 mm body), the UC3843NG4 is a through-hole part. It suits prototyping, low-volume production, or designs where hand-assembly is preferred.","metaTitle":"UC3843NG4 PWM Controller, 500kHz, 8-PDIP, Active","metaDescription":"UC3843NG4 current-mode PWM controller from TI. Switching up to 500kHz, 97% duty cycle, 12V-28V supply. 8-PDIP through-hole.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","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","Serial Interfaces":"-","Base Product Number":"UC3843","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-PDIP","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843NG4/alternatives.json"},"ai":{"faq":[{"question":"What is UC3843NG4 used for?","answer":"UC3843NG4 is a current-mode PWM controller used in DC-DC converters: boost, buck, buck-boost, flyback, and forward topologies. Typical applications include off-line power supplies, battery chargers, and industrial power converters where the input bus is 12 V to 28 V."},{"question":"What is the difference between UC3842 and UC3843NG4?","answer":"The UC3842 and UC3843 are pin-compatible current-mode PWM controllers that differ in the undervoltage lockout (UVLO) thresholds. The UC3842 has a 16 V turn-on / 10 V turn-off; the UC3843 has a lower 8.4 V turn-on / 7.6 V turn-off, making it better suited for 12 V input rails. The UC3843NG4 is the 8-PDIP through-hole variant of the UC3843."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843NG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843NG4 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}}