{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844ANG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3844ANG4","canonicalUrl":"https://icboms.com/texas-instruments/UC3844ANG4","factsUrl":"https://icboms.com/api/mcp/products/UC3844ANG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3844ANG4 current-mode PWM controller, 48% max duty cycle, up to 500 kHz switching, 10V-30V supply, 8-PDIP through-hole package, 0°C to 70°C commercial temperature range.","salesMarkdown":"## 48% duty cycle — the transformer design constraint Its 48% maximum duty cycle sets a hard ceiling on the on-time per switching cycle, which directly forces the transformer turns ratio and primary inductance to deliver the required output voltage at minimum input. Switching frequency reaches up to 500 kHz, enabling smaller magnetics and reduced transformer footprint compared to legacy 100 kHz designs. The 10 V to 30 V supply range gives headroom for unregulated bias rails common in industrial power supplies. ## Through-hole package and commercial temperature grade Housed in an 8-pin PDIP (0.300-inch body), the UC3844ANG4 is a through-hole part — no fine-pitch soldering, easy to hand-assemble or rework on a prototype board.","metaTitle":"UC3844ANG4 PWM Controller, 48% Duty Cycle, 8-PDIP","metaDescription":"UC3844ANG4 current-mode PWM controller from TI. 48% max duty cycle, up to 500 kHz switching, 10V-30V supply. Active lifecycle, 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, 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)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3844","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)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/72463d7c352ecebe0441deb1ec8c852d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844ANG4/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum duty cycle of UC3844ANG4?","answer":"The maximum duty cycle is 48%. This is a key difference from the UC3845, which allows up to 50% duty. The 48% ceiling forces a tighter transformer turns-ratio calculation in flyback designs."},{"question":"Does UC3844ANG4 have frequency control?","answer":"Yes — the UC3844ANG4 includes a frequency control feature (RT/CT pin) that lets the designer set the oscillator timing with an external resistor and capacitor. Switching frequency is programmable up to 500 kHz."},{"question":"What is the difference between UC3844 and UC3845?","answer":"The primary difference is the maximum duty cycle: UC3844 is clamped at 48%, while UC3845 allows 50%. Both are current-mode PWM controllers with the same pinout and supply range. The UC3844's slightly lower duty ceiling is intentional for certain forward-converter topologies that require a guaranteed off-time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3844ANG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3844ANG4 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}}