{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843ANG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843ANG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3843ANG4","factsUrl":"https://icboms.com/api/mcp/products/UC3843ANG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843ANG4 current-mode PWM controller, 8-DIP through-hole package, switching frequency up to 500kHz, 96% max duty cycle, 7.6V–30V supply, 0°C–70°C.","salesMarkdown":"## Current-mode PWM controller for isolated and non-isolated supplies The Texas Instruments UC3843ANG4 is a current-mode PWM controller designed for step-up, step-down, and step-up/step-down converter topologies including boost, buck, flyback, and forward converters. It delivers a single transistor-driver output with positive output configuration, capable of isolation through an external transformer, and includes frequency control for adjusting the switching regulator's timing. Switching frequency reaches up to 500 kHz, allowing smaller magnetic components at the cost of tighter layout and higher switching losses. ## 96% duty cycle — what it buys in flyback and boost designs The 96% maximum duty cycle lets the controller maintain regulation through wide input-voltage dips without dropping pulses, a practical advantage in offline flyback converters with bulk-capacitor hold-up requirements. Supply range spans 7.6 V to 30 V, covering the bias rail from a 12 V auxiliary winding or a regulated 24 V bus without an extra linear regulator. ## Through-hole 8-DIP — prototyping ease, board-density trade-off Housed in an 8-DIP (0.300\", 7.62 mm) through-hole package, the UC3843ANG4 is straightforward to hand-assemble and rework, but the 0.100-inch pitch consumes more board area than a surface-mount alternative.","metaTitle":"UC3843ANG4 PWM Controller, Up to 500kHz, 8-DIP","metaDescription":"UC3843ANG4 current-mode PWM controller from TI. Step-up/down/flyback/forward topologies, 96% duty cycle, up to 500kHz. 8-DIP 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, 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)":"96%","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)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.7300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843ANG4/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between UC3843ANG4 and UC3843AN?","answer":"Both are functionally identical current-mode PWM controllers. The UC3843ANG4 is the RoHS-compliant 'G4' suffix variant; the UC3843AN is the earlier non-RoHS version. Pinout, electrical specs, and package (8-DIP) are the same."},{"question":"What topologies does the UC3843ANG4 support?","answer":"It supports boost, buck, flyback, and forward topologies in step-up, step-down, or step-up/step-down configurations. The single transistor-driver output works with an external MOSFET and transformer for isolated designs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843ANG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843ANG4 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}}