{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040CEM3X-2.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040CEM3X-2.0","canonicalUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-2.0","factsUrl":"https://icboms.com/api/mcp/products/LM4040CEM3X-2.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040CEM3X-2.0 precision shunt voltage reference, 2.048 V fixed output, ±0.5% tolerance, 35 µVrms noise, -40°C to 125°C, SOT-23-3 package, Tape & Reel.","salesMarkdown":"## 2.048 V shunt reference with ±0.5% initial accuracy The LM4040CEM3X-2.0 is a precision shunt voltage reference from Texas Instruments that delivers a fixed 2.048 V output with a ±0.5% initial tolerance. That 2.048 V level is a natural fit for 12-bit and 16-bit ADCs with a 4.096 V full-scale input — the math is a clean 1 LSB = 1 mV, no scaling resistor needed. As a shunt reference, it behaves like a Zener diode: you set the bias current through a series resistor from the supply, and the part sinks enough cathode current (68 µA typical, up to 15 mA) to regulate the output. The 68 µA minimum operating current means the reference can run from a high-impedance supply without loading it down. ## Noise and drift for precision analog Output noise is specified at 35 µVrms over the 10 Hz to 10 kHz bandwidth — low enough that a 16-bit ADC with a 4.096 V reference sees less than 0.3 LSB of reference-induced noise. ## SOT-23-3 footprint and hand-solderability The part comes in a SOT-23-3 package (also listed as TO-236-3 / SC-59). It is a three-pin device — cathode, anode, and no-connect — so the layout is straightforward. The SOT-23-3 is hand-solderable with a fine-tip iron; no hot-air or reflow is strictly required for prototyping.","metaTitle":"LM4040CEM3X-2.0 Shunt Voltage Reference, 2.048 V ±0.5%","metaDescription":"LM4040CEM3X-2.0 precision shunt reference: 2.048 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)":"2.048V"}},"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/LM4040CEM3X-2.0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the LM4040CEM3X-2.0?","answer":"The LM4040 family includes many voltage options in the same SOT-23-3 footprint. A direct functional replacement with the same 2.048 V output and ±0.5% tolerance would be the LM4040CIM3-2.0 (industrial temperature range) or the LM4040AIM3-2.0 (higher ±0.1% tolerance). Both are pin-compatible and share the same shunt-reference topology. Check lifecycle status on those variants before committing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-2.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040CEM3X-2.0 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}}