{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040CEM3X-2.5","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040CEM3X-2.5","canonicalUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-2.5","factsUrl":"https://icboms.com/api/mcp/products/LM4040CEM3X-2.5","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040CEM3X-2.5, precision shunt voltage reference, 2.5 V fixed output, ±0.5% tolerance, 35 µVrms noise, 68 µA cathode current, SOT-23-3 package, -40°C to 125°C.","salesMarkdown":"The LM4040CEM3X-2.5 is a precision shunt voltage reference from Texas Instruments, delivering a fixed 2.5 V output with ±0.5% initial tolerance. It is designed for low-power analog circuits — ADC references, comparator thresholds, and regulator feedback dividers — where a stable, low-noise rail is needed without a series regulator. The 35 µVrms noise spec (10 Hz–10 kHz) is the headline differentiator for precision work: a 14-bit ADC with a 2.5 V reference sees about 1 LSB of noise contribution from this part alone, which is acceptable for most industrial data-acquisition chains. Cathode current is 68 µA typical, so the total supply draw through the bias resistor is under 100 µA. Housed in a SOT-23-3 package (TO-236-3 / SC-59 compatible), it is a drop-in for any three-pin shunt reference footprint. The 100 ppm/°C drift over temperature means the output shifts across the full range. For new designs, the LM4040 family still offers active grades (e.g., LM4040DIM3X-2.5) with the same pinout and 2.5 V output, though tolerance and temperature coefficient differ — verify the grade before substituting.","metaTitle":"LM4040CEM3X-2.5 Shunt Voltage Reference, 2.5 V ±0.5%","metaDescription":"LM4040CEM3X-2.5 precision shunt reference: 2.5 V fixed output, ±0.5% tolerance, 35 µVrms noise, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","Tolerance":"±0.5%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Obsolete","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"15 mA","Current - Supply":"-","Current - Cathode":"68 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"35µVrms","Operating Temperature":"-40°C~125°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8c40cf163b5cda64fd88ad5c9f25fe6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040CEM3X-2.5/alternatives.json"},"ai":{"faq":[{"question":"Is LM4040CEM3X-2.5 obsolete?","answer":"Yes, Texas Instruments lists the LM4040CEM3X-2.5 as obsolete."},{"question":"Is LM4040CEM3X-2.5 pin compatible with other SOT-23 voltage references?","answer":"Yes. The SOT-23-3 package follows the standard three-pin shunt reference pinout (cathode, anode, no-connect), making it a drop-in for any SOT-23 shunt reference with the same function."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-2.5","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040CEM3X-2.5 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}}