{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040D20QDBZR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040D20QDBZR","canonicalUrl":"https://icboms.com/texas-instruments/LM4040D20QDBZR","factsUrl":"https://icboms.com/api/mcp/products/LM4040D20QDBZR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040D20QDBZR, shunt voltage reference, fixed 2.048V output, ±1% tolerance, 80 µA cathode current, -40°C to 125°C, SOT-23-3 surface-mount package.","salesMarkdown":"## 2.048V shunt reference — what it does for your rail The LM4040D20QDBZR is a fixed 2.048V shunt voltage reference from TI's LM4040 series. It regulates by shunting current through the cathode to ground — no series pass transistor, no dropout voltage. The 80 µA minimum cathode current sets the bias resistor: for a 5V rail, (5V - 2.048V) / 80 µA = ~37 kΩ minimum. The shunt topology means it can sink up to 15 mA without an external pass device, which is enough to bias multiple ADC reference inputs or comparator thresholds on the same rail. ## Tolerance and temperature drift — fit for the accuracy budget Initial tolerance is ±1% — at 2.048V that's ±20.5 mV worst-case at 25°C. The temperature coefficient is 150 ppm/°C, adding about ±0.3 mV per 10°C shift. For a 10-bit ADC with a 2.048V reference, that's roughly ±1 LSB of drift over a 50°C window. It won't satisfy a 16-bit precision chain, but for general-purpose monitoring, comparator thresholds, and bias generation it holds the line without a precision op-amp buffer. TI lists the LM4040D20QDBZR as Active. The base product number is LM4040, which spans multiple voltage options and tolerances across the SOT-23-3 footprint. If the 2.048V ±1% is the BOM target, this part is a clean fit for new and sustaining production — no supply-chain clock to manage. ## SOT-23-3 package — board-fit checklist Three pins: cathode, anode, and a no-connect. Surface-mount only. The 0.95 mm pin pitch is standard for SOT-23; no exotic footprint required.","metaTitle":"LM4040D20QDBZR Shunt Reference, 2.048V ±1%, SOT-23-3","metaDescription":"TI LM4040D20QDBZR precision shunt voltage reference. Fixed 2.048V output, ±1% tolerance, 80 µA cathode current, -40°C to 125°C. 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); 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":"80 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":"150ppm/°C","Voltage - Output (Min/Fixed)":"2.048V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4275","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040D20QDBZR/alternatives.json"},"ai":{"faq":[{"question":"Is LM4040D20QDBZR active or obsolete?","answer":"Active. TI has not issued an EOL notice for this part. It is suitable for current production and new designs."},{"question":"What is the closest pin-compatible alternative to LM4040D20QDBZR in the LM4040 family?","answer":"The LM4040 family shares the same SOT-23-3 footprint across all voltage options and tolerance grades (A, B, C, D). A ±0.1% or ±0.5% grade (e.g., LM4040A20QDBZR) is a drop-in replacement if the system budget needs tighter accuracy. For a different output voltage, any LM4040xYZQDBZR with the same package code fits the same pads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040D20QDBZR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040D20QDBZR 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}}