{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3846J","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3846J","canonicalUrl":"https://icboms.com/texas-instruments/UC3846J","factsUrl":"https://icboms.com/api/mcp/products/UC3846J","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3846J current-mode PWM controller, 500 kHz switching frequency, 50% max duty cycle, dual outputs, 16-CDIP through-hole package, 0°C to 70°C operating temperature.","salesMarkdown":"## Current-mode PWM controller with topology flexibility The UC3846J from Texas Instruments is a current-mode PWM controller designed for step-up and step-up/step-down conversion across boost, flyback, forward converter, half-bridge, and push-pull topologies. Its dual transistor-driver outputs and integrated clock sync make it a natural fit for isolated power supplies in telecom, industrial, and server applications where the 0°C to 70°C ambient range is acceptable. ## 500 kHz switching, 50% duty — what it means for the design The 500 kHz switching ceiling allows smaller magnetics and reduced output capacitance, shrinking the bill of materials. The 50% max duty cycle is a hard limit — push-pull and half-bridge converters naturally fit within this window, but a boost or flyback requiring >50% on-time at low input voltage will need a different controller. ## Supply range and control features Operates from 6.95 V to 40 V on the Vcc/Vdd rail. Current limit, enable, frequency control, and soft start are on-chip. Synchronous rectification is supported. ## Package and lifecycle — the sourcing reality Housed in a 16-pin ceramic DIP (16-CDIP, 0.300\" body), this is a through-hole part suited for high-reliability or legacy designs where a hermetic package is specified. The laser-etch on the top surface should show consistent font and date-code alignment with TI's plant marking — any re-marked or sanded surface is a red flag. Lifecycle status is active per the manufacturer, so no last-time-buy pressure exists for new designs. RoHS non-compliant, so verify your assembly process if lead-free requirements apply.","metaTitle":"UC3846J PWM Controller, 500 kHz, 50% Duty, 16-CDIP","metaDescription":"UC3846J current-mode PWM controller from Texas Instruments. Supports boost, flyback, forward, half-bridge, push-pull. 500 kHz switching, 50% max duty.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Bulk","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull","Clock Sync":"Yes","Output Type":"Transistor Driver","Mounting Type":"Through Hole","Output Phases":"1","Package / Case":"16-CDIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable, Frequency Control, Soft Start","Duty Cycle (Max)":"50%","Number of Outputs":"2","Output Configuration":"Positive","Frequency - Switching":"500kHz","Operating Temperature":"0°C ~ 70°C (TA)","Synchronous Rectifier":"Yes","Supplier Device Package":"16-CDIP","Voltage - Supply (Vcc/Vdd)":"6.95V ~ 40V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.47","stockQuantity":0,"priceTiers":[{"qty":27,"price":"$11.47000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/58e50e058e3590a58e9444c3542a2179.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC3846J?","answer":"The maximum duty cycle is 50%. This limits its use in topologies that require >50% on-time, such as certain boost converters at low input voltage. Push-pull and half-bridge designs are a natural fit."},{"question":"Does UC3846J support synchronous rectification?","answer":"Yes — the controller includes a synchronous rectifier output, making it suitable for high-efficiency designs where the secondary-side SR FET replaces a Schottky diode."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3846J","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3846J 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}}