{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040CEM3-2.0/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040CEM3-2.0-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4040CEM3-2.0-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4040CEM3-2.0%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040 series precision shunt voltage reference, LM4040CEM3-2.0/NOPB, 2.048V fixed output, ±0.5% tolerance, 35µVrms noise, -40°C to 125°C, SOT-23-3 package, Tape & Reel.","salesMarkdown":"## 2.048V shunt reference — ±0.5% tolerance in SOT-23-3 The Texas Instruments LM4040CEM3-2.0/NOPB is a precision shunt voltage reference delivering a fixed 2.048V output with ±0.5% initial tolerance. The shunt architecture means it behaves like a two-terminal Zener — it requires a bias resistor from the supply to set the cathode current. The minimum cathode current is 68 µA, and the maximum output current is 15 mA, so the resistor value must keep the device within that window across load and supply variation. ## Noise and temperature drift — the so-what for ADC reference duty Output noise is specified at 35 µVrms over the 10 Hz to 10 kHz band. For a 12-bit ADC with a 2.048V reference, that noise contributes about 0.3 LSB — acceptable for most industrial data-acquisition channels, but a lower-noise reference (e.g., the LM4140 series) would be needed for 16-bit or higher systems. The temperature coefficient is 100 ppm/°C. For precision measurement, a lower-drift reference (e.g., 10 ppm/°C) would be necessary. The LM4040CEM3-2.0/NOPB is marked obsolete by the manufacturer. Because the part is obsolete, buyers should expect limited and diminishing availability.","metaTitle":"LM4040CEM3-2.0/NOPB Shunt Voltage Reference, 2.048V ±0.5%","metaDescription":"TI LM4040CEM3-2.0/NOPB precision shunt reference, 2.048V fixed output, ±0.5% tolerance, 35µVrms 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)":"2.048V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8c40cf163b5cda64fd88ad5c9f25fe6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040CEM3-2.0%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for LM4040CEM3-2.0/NOPB?","answer":"No official replacement is listed. For new designs, consider a current-production shunt reference from the LM4040 family with the same 2.048V output and SOT-23-3 package, verifying tolerance and temperature grade. For existing BOMs, source through independent distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040CEM3-2.0-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040CEM3-2.0-NOPB 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}}