{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3843AD","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3843AD","canonicalUrl":"https://icboms.com/texas-instruments/UC3843AD","factsUrl":"https://icboms.com/api/mcp/products/UC3843AD","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3843AD PWM controller, current-mode, multi-topology (Boost, Buck, Flyback, Forward), 500kHz max switching, 14-SOIC package, Tube.","salesMarkdown":"Texas Instruments has marked the UC3843AD as obsolete. This part is sourced through independent distribution channels — quantities are lot-specific and confirmed at RFQ. The ROHS3 compliance holds for any stock shipped, but the date-code trace and marking consistency should be verified on receipt. ## Multi-topology current-mode control The supply range spans 7.6 V to 30 V, covering common bias rails from 12 V industrial supplies up to 24 V telecom buses. Below 7.6 V the undervoltage lockout prevents the controller from starting — the input rail must hold above that threshold during the entire load transient. ## Duty cycle and output drive Maximum duty cycle is 96%, which suits flyback and forward converters that need long on-times for high step-down ratios. The single transistor-driver output drives an external N-channel MOSFET or bipolar — the gate-drive current is sourced from the Vcc pin, so the PCB trace between the supply decoupling cap and the Vcc pin should be kept short to avoid ringing on the gate waveform. The 14-SOIC package with 0.154-inch body width fits a standard SOIC-14 footprint.","metaTitle":"Texas Instruments UC3843AD PWM Controller, Obsolete, 500kHz","metaDescription":"UC3843AD PWM controller from Texas Instruments, 7.6-30V supply, up to 500kHz switching, multi-topology.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Obsolete","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":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","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":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.2700","priceTiers":[{"qty":1,"price":"$1.33000","currency":"USD"},{"qty":10,"price":"$1.19100","currency":"USD"},{"qty":25,"price":"$1.13080","currency":"USD"},{"qty":100,"price":"$0.92890","currency":"USD"},{"qty":250,"price":"$0.86828","currency":"USD"},{"qty":500,"price":"$0.76734","currency":"USD"},{"qty":1000,"price":"$0.60579","currency":"USD"},{"qty":2500,"price":"$0.57150","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/536891bbf6907bbea70f31ce571541e7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3843AD/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for UC3843AD?","answer":"Submit an RFQ through this listing. No stock-holding claim is made here — each quote reflects the lot available at that moment."},{"question":"What compliance documentation does Texas Instruments provide for UC3843AD?","answer":"The UC3843AD is ROHS3 Compliant. No REACH, UL, or IEC certification is listed in the available records. Standard TI compliance documentation (RoHS declaration, material composition) is available for the base product number UC3843."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3843AD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3843AD when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T01:04:30.686Z","lastPublished":"2026-07-21T01:04:30.686Z","indexable":true}}