{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2576T-3.3/LB03","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2576T-3.3-LB03","canonicalUrl":"https://icboms.com/texas-instruments/LM2576T-3.3-LB03","factsUrl":"https://icboms.com/api/mcp/products/LM2576T-3.3%2FLB03","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments SIMPLE SWITCHER series, LM2576T-3.3/LB03, step-down buck regulator, fixed 3.3V output, 3A, 52kHz switching frequency, through-hole TO-220-5 package, -40°C to 125°C junction temperature.","salesMarkdown":"## Fixed 3.3V buck at 3A — the TO-220-5 workhorse The LM2576T-3.3/LB03 is a SIMPLE SWITCHER step-down regulator from Texas Instruments, delivering a fixed 3.3V output at up to 3A from a 4V to 40V input rail. It uses a 52 kHz buck topology with no synchronous rectifier, so the external Schottky diode handles the catch current. ## 52 kHz switching — inductor size trade-off The 52 kHz switching frequency is low by modern standards, which means the external inductor and output capacitor will be physically larger than what a 200 kHz+ switcher would need. For a 3A design, expect a 100 µH to 330 µH inductor and a 330 µF to 1000 µF electrolytic on the output. The trade-off is lower switching losses and better efficiency at moderate loads, but the board area penalty is real. For existing BOM lines, the only supply channel is independent distribution — surplus, new-old-stock, or broker inventory. No official successor is listed on the record, but the LM2576 series includes other fixed-voltage variants that share the same pinout and footprint.","metaTitle":"LM2576T-3.3/LB03 SIMPLE SWITCHER Buck Regulator, 3A, 52kHz","metaDescription":"Texas Instruments LM2576T-3.3/LB03 SIMPLE SWITCHER step-down regulator, fixed 3.3V output, 3A, 52kHz, TO-220-5.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"SIMPLE SWITCHER®","Package":"Tube","Function":"Step-Down","Topology":"Buck","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-5 Formed Leads","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Current - Output":"3A","Number of Outputs":"1","Base Product Number":"LM2576","Output Configuration":"Positive","Frequency - Switching":"52kHz","Operating Temperature":"-40°C~125°C(TJ)","Synchronous Rectifier":"No","Voltage - Input (Max)":"40V","Voltage - Input (Min)":"4V","Voltage - Output (Max)":"-","Supplier Device Package":"TO-220-5","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/74e216c81e85fc39d2b33ae4761c412c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2576T-3.3%2FLB03/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy LM2576T-3.3/LB03?","answer":"We source LM2576T-3.3/LB03 through independent distribution channels. Submit an RFQ for current availability and pricing — the part is quoted to order, not held available via RFQ confirmation."},{"question":"What is the switching frequency of LM2576T-3.3/LB03?","answer":"The switching frequency is 52 kHz. This is a fixed-frequency buck topology; the inductor and capacitor values must be selected for that frequency."},{"question":"What is the replacement for LM2576T-3.3/LB03?","answer":"No official replacement is listed on the record. Other fixed-voltage variants in the LM2576 series (e.g., LM2576T-5.0, LM2576T-12) share the same pinout and package, but the output voltage differs. For a modern alternative, consider a higher-frequency synchronous buck converter in a similar TO-220 or D2PAK package — the pinout will not match, so a layout change is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2576T-3.3-LB03","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2576T-3.3-LB03 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}}