{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940CT-12","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940CT-12","canonicalUrl":"https://icboms.com/texas-instruments/LM2940CT-12","factsUrl":"https://icboms.com/api/mcp/products/LM2940CT-12","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940CT-12, fixed 12V output LDO regulator, 1A output current, 0.8V dropout at 1A, 66dB PSRR at 120Hz, TO-220-3 through-hole package, 0°C to 125°C operating temperature.","salesMarkdown":"## 12V fixed output, 1A — the BOM-fit check The Texas Instruments LM2940CT-12 is a fixed 12V output, positive-voltage LDO regulator rated for 1A continuous output current. The 0.8V maximum dropout at full load means the input rail needs at least 12.8V to maintain regulation — a 13.8V nominal supply (common in automotive and industrial 12V bus systems) provides adequate headroom. At 1A output the quiescent current is 10 mA typical, rising to 15 mA maximum — the LDO stays efficient enough for moderate-load designs without a heatsink, though the TO-220-3 tab can be bolted to a ground plane or chassis for thermal relief. For new designs, look at the pin-compatible LM2940T-12.0 or the LM2940S-12 (TO-263 surface-mount variant) — both are active and share the same 12V fixed output and 1A rating. ## TO-220-3 — through-hole mounting and thermal path The TO-220-3 through-hole package (supplier device package TO-220-3) is a standard three-lead power package. The metal tab is internally connected to the output pin; it can be soldered to a copper pad on the PCB or bolted to a heatsink. ## Protection features — built-in fault tolerance The LM2940CT-12 integrates over-current, over-temperature, reverse polarity, and short-circuit protection. These make it a robust choice for power supplies in automotive aftermarket, industrial control panels, and bench power supplies where the load may fault or the input polarity could be reversed during wiring.","metaTitle":"LM2940CT-12 12V 1A LDO Regulator, TO-220-3, NRND","metaDescription":"Texas Instruments LM2940CT-12 fixed 12V output LDO, 1A, 0.8V dropout, 66dB PSRR at 120Hz. TO-220-3 through-hole.","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)":"12V"}},"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-12/alternatives.json"},"ai":{"faq":[{"question":"Is the LM2940CT-12 obsolete or recommended for new designs?","answer":"It is still available for existing production but should not be selected for new BOMs. The active LM2940T-12.0 (TO-220-3) or LM2940S-12 (TO-263) are pin-compatible replacements with the same 12V fixed output and 1A rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940CT-12","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-12 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}}