{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040A30IDBZRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040A30IDBZRG4","canonicalUrl":"https://icboms.com/texas-instruments/LM4040A30IDBZRG4","factsUrl":"https://icboms.com/api/mcp/products/LM4040A30IDBZRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040A30IDBZRG4, precision shunt voltage reference, fixed 3 V output, ±0.1% tolerance, 35 µVrms noise, 15 mA output, SOT-23-3, -40°C to 85°C.","salesMarkdown":"## 3 V shunt reference with ±0.1% tolerance — the bench-grade choice The Texas Instruments LM4040A30IDBZRG4 is a precision shunt voltage reference delivering a fixed 3 V output with an initial tolerance of ±0.1% — tight enough to set the ADC reference in a 12-bit system without external trimming. It's the A-grade variant of the LM4040 family, which means the tolerance and temperature drift are binned tighter than the standard ±0.5% or ±1% parts. For a 3 V reference, that works out to about 12 ppm rms, clean enough for a 16-bit SAR converter without an external filter. The temperature coefficient is 100 ppm/°C, so from 25°C to 85°C the output shifts by roughly 18 mV worst-case — a factor to budget if the board lives near a hot regulator or motor driver. ## SOT-23-3 package and shunt topology — layout realities The part comes in a standard SOT-23-3 package (also listed as TO-236-3 / SC-59), which is a three-pin footprint shared across the entire LM4040 family. Being a shunt reference, it sits in parallel with the load and requires a series resistor from the supply to set the cathode current. The datasheet cathode current range is 82 µA minimum to 15 mA maximum — stay above the minimum to guarantee regulation, and keep the total current (load + reference) under 15 mA to avoid exceeding the output current rating.","metaTitle":"LM4040A30IDBZRG4 3V Shunt Reference, ±0.1%, SOT-23-3","metaDescription":"Texas Instruments LM4040A30IDBZRG4 precision shunt voltage reference, fixed 3 V output, ±0.1% tolerance, 35 µVrms noise, SOT-23-3.","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)","Tolerance":"±0.1%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","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~85°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1600","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040A30IDBZRG4/alternatives.json"},"ai":{"faq":[{"question":"Can LM4040A30IDBZRG4 be replaced by another Texas Instruments reference?","answer":"The LM4040 family includes multiple tolerance grades and output voltages in the same SOT-23-3 footprint. A pin-compatible alternative with a different tolerance (e.g., ±0.5% or ±1%) or a different fixed voltage (1.225 V, 2.048 V, 2.5 V, 4.096 V, 5 V) can be selected from the same base product number LM4040 without a board layout change."},{"question":"What is the cathode current of LM4040A30IDBZRG4?","answer":"The minimum cathode current for regulation is 82 µA, and the maximum continuous cathode current is 15 mA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040A30IDBZRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040A30IDBZRG4 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}}