{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL2845D","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL2845D","canonicalUrl":"https://icboms.com/texas-instruments/TL2845D","factsUrl":"https://icboms.com/api/mcp/products/TL2845D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL2845D current-mode PWM controller, step-up/step-down boost/flyback/forward topology, 48% max duty cycle, up to 500 kHz switching frequency, 7.6 V to 30 V supply, 14-SOIC surface-mount package, -40°C to 85°C operating temperature.","salesMarkdown":"## TL2845D — current-mode PWM controller for isolated and non-isolated topologies The TL2845D is a fixed-frequency current-mode PWM controller from Texas Instruments, built for step-up and step-up/step-down conversion in boost, flyback, and forward converter topologies. It drives a single transistor output at switching frequencies up to 500 kHz, with a maximum duty cycle clamped at 48%. The controller operates from a 7.6 V to 30 V supply rail and is specified over the -40°C to 85°C industrial temperature range. Housed in a 14-SOIC package, it includes frequency control and positive output configuration — no synchronous rectification, no clock sync. This is a workhorse part for off-line and DC-DC supplies where current-mode control and a hard duty-cycle limit are design requirements. ## 48% duty cycle — what it means for the transformer The 48% maximum duty cycle is a deliberate clamp typical of the UCx84x family. In a forward converter, this forces the use of a reset winding or active clamp to reset the transformer core within the off-time. In a flyback, it limits the volt-second product and keeps the core from saturating at high input voltage. The 500 kHz switching ceiling lets you shrink the magnetic components, but the duty clamp stays the same — plan your turns ratio and reset scheme around this hard limit. ## Sourcing and lifecycle — still an active production part The TL2845D is listed as Active with ROHS3 compliance. No end-of-life notice, no last-time-buy window.","metaTitle":"TL2845D PWM Controller, 48% Duty Cycle, 500 kHz, 14-SOIC","metaDescription":"TL2845D current-mode PWM controller. Step-up/step-down, boost/flyback/forward topology. 48% max duty, up to 500 kHz. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback, Forward","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"14-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"Up to 500kHz","Operating Temperature":"-40°C ~ 85°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"14-SOIC","Voltage - Supply (Vcc/Vdd)":"7.6V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.47","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.47000","currency":"USD"},{"qty":10,"price":"$1.31300","currency":"USD"},{"qty":25,"price":"$1.24640","currency":"USD"},{"qty":100,"price":"$1.02400","currency":"USD"},{"qty":250,"price":"$0.95720","currency":"USD"},{"qty":500,"price":"$0.84588","currency":"USD"},{"qty":1000,"price":"$0.66780","currency":"USD"},{"qty":2500,"price":"$0.63000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/13d25486c92c05874692db571fc5be81.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum duty cycle and switching frequency of the TL2845D?","answer":"Maximum duty cycle is 48%. Switching frequency goes up to 500 kHz."},{"question":"What is the difference between the TL2845D and the UC2845?","answer":"The TL2845D and UC2845 are functionally similar current-mode PWM controllers. The key difference is temperature grade: the TL2845D is rated for -40°C to 85°C (industrial), while the UC2845 typically covers -40°C to 85°C as well — the main variant difference is manufacturer-specific ordering code and test level. Pinout and basic specs (48% duty, 500 kHz max, same supply range) are shared across the UCx84x family."},{"question":"What is the TL2845D equivalent substitute part number?","answer":"A functional peer is the UCC2806DWTR, also a current-mode PWM controller in a 14-SOIC package, but it offers dual outputs, synchronous rectification capability, and 50% duty cycle. The LM5150QURUMRQ1 is an automotive-grade boost controller with 87% duty and clock sync — different topology fit. For a direct drop-in, the UC2845 family from multiple manufacturers is the closest match."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL2845D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL2845D 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}}