{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040C30QDBZR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040C30QDBZR","canonicalUrl":"https://icboms.com/texas-instruments/LM4040C30QDBZR","factsUrl":"https://icboms.com/api/mcp/products/LM4040C30QDBZR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040C30QDBZR, precision micropower shunt voltage reference, fixed 3 V output, ±0.5% tolerance, 35 µVrms noise, 100 ppm/°C drift, -40°C to 125°C, SOT-23-3 package, Tape & Reel.","salesMarkdown":"## 3 V shunt reference for precision bias and ADC rails The shunt topology means it behaves like a two-terminal Zener: you set the cathode current with a single series resistor from the supply rail. The 82 µA minimum cathode current allows it to run from a high-impedance bias, and the 15 mA maximum output current gives headroom for driving a single ADC reference input or a comparator threshold divider. Wideband noise is specified at 35 µVrms over the 10 Hz to 10 kHz band. For a 3 V reference feeding a 12-bit ADC with a 3 V full-scale range, that noise floor contributes roughly 0.5 LSB of uncertainty — acceptable for most industrial measurements but worth derating if you are pushing 14-bit resolution without averaging. Temperature drift is rated at 100 ppm/°C. That matters if your system calibrates at room temperature and then sees a 60°C rise inside the enclosure — the drift budget eats into the ADC's usable code range.","metaTitle":"LM4040C30QDBZR Shunt Voltage Reference, 3 V ±0.5%, SOT-23-3","metaDescription":"Texas Instruments LM4040C30QDBZR precision micropower shunt reference. Fixed 3 V output, ±0.5% tolerance, 35 µVrms noise, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±0.5%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"15 mA","Current - Supply":"-","Current - Cathode":"82 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)":"3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.3100","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040C30QDBZR/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance of LM4040C30QDBZR?","answer":"Initial tolerance is ±0.5% at 25°C. That is a mid-grade precision tier — tight enough for 8- to 10-bit ADC references without external trimming, but not the ±0.1% grade needed for 12-bit-plus systems."},{"question":"What package does LM4040C30QDBZR come in?","answer":"It is supplied in a SOT-23-3 surface-mount package (also listed as TO-236-3 / SC-59). The shipping medium is Tape & Reel or Cut Tape."},{"question":"Can LM4040C30QDBZR replace LM4040A30?","answer":"Both are 3 V shunt references in the same LM4040 family. The 'C' grade denotes ±0.5% tolerance, while the 'A' grade is ±0.1%. They are pin-compatible in the same SOT-23-3 footprint, so a direct replacement is possible if the tighter tolerance of the 'A' grade is not required for your application."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040C30QDBZR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040C30QDBZR 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}}