{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3842ADW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3842ADW","canonicalUrl":"https://icboms.com/texas-instruments/UC3842ADW","factsUrl":"https://icboms.com/api/mcp/products/UC3842ADW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3842ADW current-mode PWM controller, switching frequency up to 500 kHz, 96% max duty cycle, 10V to 30V supply, 16-SOIC surface mount package, 0°C to 70°C operating temperature.","salesMarkdown":"## Current-mode PWM controller for flyback and forward converters The UC3842ADW is a current-mode PWM controller from Texas Instruments, designed for single-ended topologies including boost, buck, flyback, and forward converters. It delivers a single transistor-driver output with a maximum duty cycle of 96% and a switching frequency that can be set up to 500 kHz. ## 500 kHz switching — transformer size vs. loss trade-off Switching at up to 500 kHz lets you shrink the magnetic components — a flyback transformer at 100 kHz might be three times the core volume of one running at 500 kHz. The trade-off is higher switching losses in the MOSFET and snubber dissipation; the UC3842ADW's current-mode architecture gives cycle-by-cycle current limiting that helps keep the switch within its SOA during transients. The 96% maximum duty cycle is useful in boost and flyback stages where the input voltage is well below the output — for example, a 12 V input to a 48 V output flyback can run near full duty without pulse-skipping, which keeps the output ripple predictable. The undervoltage lockout (UVLO) threshold is typically 8.4 V on the UC3842 family, so the controller stays off until the bias supply is stable — no partial startup glitches. ## 16-SOIC package — fits a standard footprint Housed in a 16-SOIC with 7.50 mm body width, the UC3842ADW uses the same footprint as the industry-standard UC3842 SOIC-16 layout. The wide body gives decent creepage between the high-voltage sense pins and the low-voltage control pins — important in flyback designs where the primary-side ground reference is noisy. The UC3842ADW can be specified into new BOMs without a near-term end-of-life risk.","metaTitle":"UC3842ADW PWM Controller, 500 kHz, 96% Duty Cycle, 16-SOIC","metaDescription":"UC3842ADW current-mode PWM controller from TI. Switching freq up to 500 kHz, 96% max duty cycle, 10-30V supply. Active production, 16-SOIC.","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":"Surface Mount","Output Phases":"1","Package / Case":"16-SOIC (0.295\\\", 7.50mm 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":"UC3842","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"16-SOIC","Voltage - Supply (Vcc/Vdd)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7673","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/536891bbf6907bbea70f31ce571541e7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3842ADW/alternatives.json"},"ai":{"faq":[{"question":"Can UC3842ADW be used in flyback converters?","answer":"Yes, the UC3842ADW supports flyback topology directly. Its current-mode control provides cycle-by-cycle current limiting, which is the standard control method for flyback converters in the 10 W to 150 W range."},{"question":"What is the difference between UC3842ADW and UC3842?","answer":"The UC3842ADW is the surface-mount 16-SOIC version of the base UC3842. The base UC3842 is typically offered in an 8-pin DIP or SOIC-8 package with fewer features (no frequency control pin). The ADW variant in 16-SOIC adds a frequency control pin and provides the full pinout for external synchronisation and trimming."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3842ADW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3842ADW 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}}