{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040D50QDBZR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040D50QDBZR","canonicalUrl":"https://icboms.com/texas-instruments/LM4040D50QDBZR","factsUrl":"https://icboms.com/api/mcp/products/LM4040D50QDBZR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040D50QDBZR precision shunt voltage reference, 5V fixed output, ±1% tolerance, 80µVrms noise, -40°C to 125°C, SOT-23-3 package, Tape & Reel.","salesMarkdown":"## 5V fixed shunt reference — the BOM anchor for precision bias As a shunt reference, it requires only a single external resistor to set the bias current — no output capacitor needed for stability. The 95 µA minimum cathode current keeps the quiescent draw low, while the 15 mA output current capability can bias multiple downstream stages or an ADC reference input. ## Noise floor and temperature drift — what they mean for measurement accuracy The 80 µVrms noise over 10 Hz to 10 kHz sets the noise floor for the reference voltage. In a 5V system, this corresponds to roughly 16 ppm of the output — acceptable for 12-bit ADC references but worth derating for 16-bit designs where the LSB is below 80 µV. For a 5V rail, that is 150 ppm per °C — a typical grade for cost-optimised precision references. If tighter drift is needed, the LM4040A or LM4040B variants (0.1% and 0.2% tolerance respectively) offer lower TC options within the same family. ## SOT-23-3 footprint — layout and supply-chain fit The SOT-23-3 package (TO-236, SC-59 compatible) is a standard three-pin footprint that fits easily on 2-layer boards. The cathode, anode, and no-connect pins match the pinout of most shunt references in this class, simplifying a last-minute alternate qualification. The ±1% tolerance grade is the most widely stocked variant in the LM4040 family, which improves availability across distribution channels. For BOM resilience, the LM4040 family spans multiple tolerance grades (0.1% to 1%) and output voltages (2.5V, 3.0V, 4.096V, 5V). The 5V 1% grade is the most common tier, meaning alternate distributors and date-code lots are easier to source compared to tighter-tolerance variants.","metaTitle":"LM4040D50QDBZR Shunt Voltage Reference, 5V Fixed, ±1%","metaDescription":"Texas Instruments LM4040D50QDBZR precision shunt reference: 5V fixed output, ±1% tolerance, 80µVrms noise, -40°C to 125°C. SOT-23-3 package.","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":"±1%","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":"95 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"80µVrms","Operating Temperature":"-40°C~125°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"150ppm/°C","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4425","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040D50QDBZR/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance of LM4040D50QDBZR?","answer":"The initial tolerance is ±1% at 25°C. This means the output voltage can vary between 4.95V and 5.05V at room temperature. For tighter accuracy, consider the LM4040A (0.1%) or LM4040B (0.2%) grades within the same family."},{"question":"Is LM4040D50QDBZR RoHS compliant?","answer":"The part is listed with a standard commercial RoHS compliance status. The SOT-23-3 package is lead-free compatible. Verify the specific date-code lot for full RoHS declaration if required for your market."},{"question":"What package does LM4040D50QDBZR come in?","answer":"The LM4040D50QDBZR is supplied in a SOT-23-3 package (also designated as TO-236 or SC-59). The supplier device package is SOT-23-3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040D50QDBZR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040D50QDBZR 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}}