{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940SX-12","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940SX-12","canonicalUrl":"https://icboms.com/texas-instruments/LM2940SX-12","factsUrl":"https://icboms.com/api/mcp/products/LM2940SX-12","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940SX-12, 12V fixed-output positive LDO regulator, 1A output, 66dB PSRR at 120Hz, 1V max dropout at 1A, TO-263-4 D²Pak, -40°C to 125°C, surface mount.","salesMarkdown":"The LM2940SX-12 is a fixed 12 V positive-output LDO regulator from Texas Instruments, delivering up to 1 A continuous. The 66 dB PSRR at 120 Hz tells you it rejects mains-frequency ripple well — expect clean 12 V from a rectified 15–26 V input, which is the typical front-end for industrial control boards, automotive ECUs, and point-of-load supplies in telecom gear. Dropout is 1 V max at the full 1 A load, so the input rail needs at least 13 V to hold regulation. That 1 V headroom is tight for battery-backed systems but comfortable for a regulated 15 V or 24 V bus. That means Texas Instruments will not accept new design registrations, and the part is on a path toward end-of-life. For a BOM line already using this regulator, the NRND flag means you should qualify a drop-in alternative before the next LTB window closes. The fixed 12 V output, 1 A rating, and TO-263-3 footprint narrow the search to the same LM2940 family or a pin-compatible LDO from another vendor — but no official cross-reference is published. ## Package and temperature — board-fit checklist The TO-263-4 D²Pak (3 leads plus tab) is a surface-mount power package. The exposed tab is the output and the primary thermal path. The protection features — over-current, over-temperature, reverse polarity, and short-circuit — let the regulator survive a faulted rail without external clamp diodes in most designs.","metaTitle":"LM2940SX-12 12V Fixed LDO Regulator, 1A, NRND","metaDescription":"LM2940SX-12 12V fixed-output LDO, 1A, 66dB PSRR at 120Hz, TO-263-4 D²Pak, -40°C to 125°C.","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":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), TO-263AA","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":"-40°C~125°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"1V @ 1A","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"-","Supplier Device Package":"DDPAK/TO-263-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.8700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1c4256f4019947c4206f2126daf8930.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940SX-12/alternatives.json"},"ai":{"faq":[{"question":"Is LM2940SX-12 obsolete?","answer":"It is not yet fully discontinued, but it is no longer recommended for new designs. Sourcing is through independent distribution against an RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940SX-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/LM2940SX-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}}