{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940CT-15","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940CT-15","canonicalUrl":"https://icboms.com/texas-instruments/LM2940CT-15","factsUrl":"https://icboms.com/api/mcp/products/LM2940CT-15","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940CT-15, fixed 15V output LDO regulator, 1A, 0.8V dropout at 1A, 66dB PSRR at 120Hz, TO-220-3 through-hole package, 0°C to 125°C operating range.","salesMarkdown":"The LM2940CT-15: Maximum input voltage is 26V, so the part can regulate 15V from a 24V nominal supply with 2V of headroom above dropout. The 0.8V dropout at 1A means the input must stay above 15.8V to maintain regulation — a 12V input will not produce a regulated 15V output. For a 12V-to-15V boost, you need a switching converter, not this LDO. That Iq is high by modern LDO standards — expect ~150 mW of quiescent loss at 15V output, which the TO-220 tab can sink if the junction stays below 125°C. PSRR is 66 dB at 120 Hz, useful for filtering 100/120 Hz ripple from a rectified AC input. For higher-frequency switching noise, the PSRR rolls off — a post-filter LC stage may be needed if the supply comes from a switcher. For volume or long-term contracts, evaluate a second-source or a newer LDO family before committing the BOM. ## Protection features and thermal reality Built-in protection covers overcurrent, overtemperature, reverse polarity, and short circuit. The TO-220-3 tab is the primary heat path — in a 1A, 15V output application with 5V input-output differential, expect 5W dissipation. That requires a heatsink; the tab is electrically common with ground, so no isolation pad is needed for a grounded heatsink.","metaTitle":"LM2940CT-15 15V 1A LDO Regulator, TO-220-3, NRND","metaDescription":"Texas Instruments LM2940CT-15 fixed 15V output LDO, 1A, 0.8V dropout, 66dB PSRR at 120Hz. Input up to 26V.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"66dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Not For New Designs","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1A","Base Product Number":"LM2940","Protection Features":"Over Current, Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C~125°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"0.8V @ 1A","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"-","Supplier Device Package":"TO-220-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"15V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.7500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1c4256f4019947c4206f2126daf8930.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940CT-15/alternatives.json"},"ai":{"faq":[{"question":"Can LM2940CT-15 be used in a 12V input to 15V output application?","answer":"No. A 12V input is below the 15.8V minimum needed for regulation (15V output plus 0.8V dropout). This LDO requires an input above 15.8V to produce a regulated 15V output."},{"question":"What is a direct replacement for LM2940CT-15 if it is not for new designs?","answer":"For a pin-compatible 15V LDO in TO-220-3, evaluate the LM2940 series from TI or a newer LDO family such as the TPS7A47 or TPS7A49 series, which offer lower dropout and Iq, but verify pinout and compensation requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940CT-15","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2940CT-15 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}}