{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4051BEM3X-1.2/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4051BEM3X-1.2-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4051BEM3X-1.2-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4051BEM3X-1.2%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4051BEM3X-1.2/NOPB, precision shunt voltage reference, fixed 1.225V output, ±0.2% tolerance, 50ppm/°C, 12 mA output, 65 µA cathode current, SOT-23-3, -40°C to 125°C.","salesMarkdown":"## Precision 1.225V shunt reference in SOT-23-3 The Texas Instruments LM4051BEM3X-1.2/NOPB is a precision shunt voltage reference delivering a fixed 1.225V output with a tight ±0.2% initial tolerance and a low 50ppm/°C temperature coefficient. It is designed for precision analog circuits where a stable, accurate voltage reference is required over a wide operating range. ## Current budget and bias resistor sizing As a shunt reference, the LM4051BEM3X-1.2/NOPB requires an external series resistor to set the bias current. The device can sink up to 12 mA of output current while its own cathode current is just 65 µA, so the total current through the bias resistor is the sum of the load current and the cathode current. This means the bias resistor value must be chosen to supply at least 65 µA to the reference under all load conditions, plus whatever current the load draws, while keeping the total below the 12 mA maximum. The low cathode current makes it efficient for battery-powered or low-power designs. ## Noise performance for signal-chain applications","metaTitle":"LM4051BEM3X-1.2/NOPB Shunt Voltage Reference, ±0.2%","metaDescription":"Texas Instruments LM4051BEM3X-1.2/NOPB precision shunt reference, 1.225V fixed output, ±0.2% tolerance, 50ppm/°C drift, -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)","Tolerance":"±0.2%","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":"12 mA","Current - Supply":"-","Current - Cathode":"65 µA","Base Product Number":"LM4051","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"20µVrms","Operating Temperature":"-40°C ~ 125°C (TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"50ppm/°C","Voltage - Output (Min/Fixed)":"1.225V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e499b7cd54f3272232db27a8df268948.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4051BEM3X-1.2%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"What is the cathode current range for LM4051BEM3X-1.2/NOPB?","answer":"The minimum cathode current is 65 µA, and the maximum output current the device can sink is 12 mA. The bias resistor must be sized to keep the total current within this window across all load and temperature conditions."},{"question":"Can LM4051BEM3X-1.2/NOPB replace LM4040AIM3-1.2?","answer":"Both are 1.225V shunt references in SOT-23-3 packages, but the LM4051BEM3X-1.2/NOPB has a ±0.2% tolerance versus the LM4040AIM3-1.2's ±0.1% (A-grade). The pinout is the same, so it is a drop-in replacement if the looser tolerance is acceptable for the application."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4051BEM3X-1.2-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4051BEM3X-1.2-NOPB 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}}