{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940S-8.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940S-8.0","canonicalUrl":"https://icboms.com/texas-instruments/LM2940S-8.0","factsUrl":"https://icboms.com/api/mcp/products/LM2940S-8.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940S-8.0, fixed 8V output, 1A low-dropout positive voltage regulator, 66dB PSRR at 120Hz, -40°C to 125°C, DDPAK/TO-263-3 surface-mount package.","salesMarkdown":"## 8V fixed output, 1A capacity — the rail it serves The Texas Instruments LM2940S-8.0 is a fixed 8V output, 1A low-dropout positive voltage regulator in a DDPAK/TO-263-3 surface-mount package. It is a single-output LDO designed for applications that need a regulated 8V rail from a higher, unregulated DC input — common in automotive electronics, industrial control boards, and post-regulation stages in multi-rail supplies. The maximum dropout voltage is 1V at 1A output current. This means the input must stay above 9V to maintain regulation at full load — a 9V nominal rail is the practical floor, and a 12V automotive battery bus gives comfortable margin even during cranking. PSRR is 66 dB at 120 Hz, which is the dominant ripple frequency from a full-wave rectified mains supply. This level of rejection cleans up the residual AC ripple on the input before it reaches the load — relevant when this regulator feeds an analog front-end or a sensor bias rail. ## Protection set and temperature range The regulator includes over-current, over-temperature, reverse polarity, and short-circuit protection. These protections make it suitable for environments where the input supply is noisy or subject to fault conditions — automotive load-dump, reverse battery, or a shorted load on the output. No official successor or replacement part number is recorded in the lifecycle data.","metaTitle":"LM2940S-8.0 8V 1A LDO Regulator, TO-263, Obsolete","metaDescription":"Texas Instruments LM2940S-8.0 fixed 8V output, 1A low-dropout regulator in DDPAK/TO-263-3. 66dB PSRR at 120Hz, -40°C to 125°C range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"66dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), TO-263AA","Product Status":"Obsolete","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)":"8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f38d6c1a461ac905342e1b9990545fb3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940S-8.0/alternatives.json"},"ai":{"faq":[{"question":"Is LM2940S-8.0 obsolete?","answer":"Yes, Texas Instruments lists the LM2940S-8.0 as obsolete. No official replacement part number has been published."},{"question":"What are the protection features of LM2940S-8.0?","answer":"These features allow it to survive fault conditions common in automotive and industrial power rails."},{"question":"What is the PSRR of LM2940S-8.0?","answer":"The power supply rejection ratio is 66 dB at 120 Hz. This is the ripple frequency from a full-wave rectified mains supply, so the regulator effectively cleans up the 100/120 Hz ripple on its input before it reaches the load."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940S-8.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2940S-8.0 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}}