{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3845D8","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3845D8","canonicalUrl":"https://icboms.com/texas-instruments/UC3845D8","factsUrl":"https://icboms.com/api/mcp/products/UC3845D8","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3845D8, current-mode PWM controller, 8-SOIC surface mount, boost/buck/flyback/forward topology, up to 500 kHz switching, 12 V to 28 V supply, 48% max duty cycle, 0°C to 70°C operation.","salesMarkdown":"## What this PWM controller does in a supply The UC3845D8 is a current-mode PWM controller that drives a single external transistor in boost, buck, buck-boost, flyback, or forward topologies. It runs from a 12 V to 28 V bias rail — common in 24 V industrial supplies — and switches the external transistor at up to 500 kHz, which shrinks the magnetics and output filter cap. The 48% maximum duty cycle caps the step-down ratio in a buck or the step-up ratio in a boost. If your design needs more than that, you are looking at a two-switch forward or a different controller family. At 500 kHz the transformer core volume and output filter inductance drop roughly 5× compared to a 100 kHz design. That saves board space and copper cost, but the trade-off is higher switching losses in the external MOSFET and more care needed on the gate-drive layout. The 48% duty ceiling means a flyback converter running from a 24 V input can regulate down to about 12 V before the controller hits its maximum on-time. Below that output voltage you need a different topology or a transformer turns ratio adjustment. For automotive or outdoor use the LM5150QURUMRQ1 covers -40°C to 150°C with a higher duty cycle and clock sync. ## Package and footprint — 8-SOIC with tube delivery The tube quantity suits prototype runs and small-batch production; for higher volumes the same die is available in tape-and-reel as the UC3845D8TR. Keep the supply pins decoupled with a 0.1 µF ceramic within 5 mm of each VCC pin.","metaTitle":"UC3845D8 Texas Instruments Power Management IC – Active","metaDescription":"UC3845D8 current-mode PWM controller from TI, 500 kHz switching, 48% duty, 12-28 V supply. Active lifecycle, tube package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","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, Buck-Boost, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3845","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C~70°C(TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-SOIC","Voltage - Supply (Vcc/Vdd)":"12V ~ 28V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6200","priceTiers":[{"qty":1,"price":"$1.62000","currency":"USD"},{"qty":10,"price":"$1.44800","currency":"USD"},{"qty":25,"price":"$1.37400","currency":"USD"},{"qty":100,"price":"$1.12880","currency":"USD"},{"qty":250,"price":"$1.05516","currency":"USD"},{"qty":500,"price":"$0.93248","currency":"USD"},{"qty":1000,"price":"$0.73617","currency":"USD"},{"qty":2500,"price":"$0.69450","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3edad1712993fb3b1751953d793dcfb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3845D8/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3845D8","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3845D8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}