{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844J","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3844J","canonicalUrl":"https://icboms.com/texas-instruments/UC3844J","factsUrl":"https://icboms.com/api/mcp/products/UC3844J","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3844J current-mode PWM controller, 8-CDIP hermetic package, 48% max duty cycle, up to 500 kHz switching, boost/buck/flyback/forward topologies, 0°C to 70°C.","salesMarkdown":"## What this PWM controller does in the supply The UC3844J is a current-mode PWM controller for off-line and DC-DC converters. It supports boost, buck, buck-boost, flyback, and forward topologies. The 48% maximum duty cycle prevents transformer saturation in single-ended flyback and forward converters by guaranteeing a reset interval each cycle. Switching frequency goes up to 500 kHz, letting you shrink the magnetic components. ## Hermetic 8-CDIP — the high-reliability package This is the ceramic DIP version (8-CDIP, 0.300-inch body), not the plastic DIP or SOIC that most UC384x parts ship in. The hermetic cavity protects the die from moisture and contaminants — it's the package you spec for sealed modules, avionics boxes, or any assembly that sees conformal coating or harsh environments. Through-hole mounting means it goes into a socket or solders into plated through-holes. For a repair bench, that's a plus — you can swap it without hot air. For a new design, it takes up more board area than an SOIC-8 but gives you a mechanical anchor.","metaTitle":"UC3844J PWM Controller, 48% Duty Cycle, 8-CDIP","metaDescription":"UC3844J current-mode PWM controller in hermetic 8-CDIP. Supports boost, buck, flyback, forward topologies. 500 kHz switching, 48% max duty.","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":"Bulk","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-CDIP (0.300\\\", 7.62mm)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-CDIP","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c2bf7869804089dd1362a76c356f2eb5.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844J/alternatives.json"},"ai":{"faq":[{"question":"Can I use UC3844J in a flyback converter design?","answer":"Yes — flyback is one of the supported topologies. The 48% duty cycle limit is actually ideal for a single-ended flyback, ensuring the core resets completely each cycle. The current-mode control gives good line regulation and simplifies loop compensation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3844J","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3844J 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}}