{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040AIM3-3.0/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040AIM3-3.0-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4040AIM3-3.0-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4040AIM3-3.0%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040AIM3-3.0/NOPB, precision shunt voltage reference, fixed 3V output, ±0.1% tolerance, 100ppm/°C, 35µVrms noise, SOT-23-3 package, -40°C to 85°C.","salesMarkdown":"## Precision 3V shunt reference in a SOT-23-3 footprint The Texas Instruments LM4040AIM3-3.0/NOPB is a precision shunt voltage reference delivering a fixed 3V output with ±0.1% initial tolerance. It operates as a two-terminal shunt (Zener-mode) device, requiring only an external series resistor to set the bias current. ## What the ±0.1% tolerance and 100 ppm/°C drift mean for your BOM The ±0.1% initial accuracy means the output voltage at 25°C is within 3 mV of 3.0 V — tight enough for a 12-bit ADC reference without external trim. For a 10-bit or 12-bit system this is well within the LSB budget; for a 14-bit or higher system the drift may need a software calibration or a tighter-grade (A or D) variant. The 35 µVrms noise (10 Hz to 10 kHz) is low enough that it won't dominate the noise floor of a 12-bit SAR ADC with a 3V reference input. If the reference feeds a 16-bit ADC or a sensitive PLL bias, an external 0.1 µF bypass cap at the output pin further knocks down the wideband noise. ## Shunt topology — design note for the BOM engineer Because this is a shunt reference, the load current plus the minimum cathode current of 67 µA must flow through the external series resistor at all times. The 15 mA maximum output current sets the upper limit on total current through the device. If the load draws less than the minimum cathode current, the reference may drop out of regulation — so a pull-down resistor or a dummy load may be needed in very light-load designs. The SOT-23-3 package (TO-236-3, SC-59 compatible) shares the same pinout as most other SOT-23 shunt references, so a board layout designed for a LM4040 or similar part accepts this device without a PCB change.","metaTitle":"LM4040AIM3-3.0/NOPB Shunt Voltage Reference, 3V ±0.1%","metaDescription":"Texas Instruments LM4040AIM3-3.0/NOPB precision shunt reference, 3V fixed output, ±0.1% tolerance, 100ppm/°C drift, 35µVrms noise. Active, 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":"±0.1%","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":"67 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":"https://cdn.icboms.com/db47fc1a31c797b619d88478be755429.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040AIM3-3.0%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Is LM4040AIM3-3.0/NOPB pin compatible with other SOT-23-3 voltage references?","answer":"Yes. The SOT-23-3 (TO-236-3, SC-59) footprint and pinout — cathode, anode, and no-connect (NC) — are standard across the LM4040 family and most other SOT-23 shunt references from various manufacturers. A board laid out for a generic SOT-23 shunt reference accepts this part without modification."},{"question":"What is the difference between LM4040AIM3-3.0/NOPB and LM4040AIM3-5.0?","answer":"The only difference is the fixed output voltage. The LM4040AIM3-3.0/NOPB outputs 3.0 V; the LM4040AIM3-5.0 outputs 5.0 V. Both share the same SOT-23-3 package, ±0.1% tolerance, 100 ppm/°C drift, 35 µVrms noise, and 15 mA output current rating. The pinout and operating conditions are identical."},{"question":"Can I use LM4040AIM3-3.0/NOPB as a replacement for a Zener diode?","answer":"Yes, functionally it replaces a 3.0 V Zener diode with significantly better accuracy and stability. Unlike a Zener, the LM4040AIM3-3.0/NOPB provides a fixed 3.0 V output with ±0.1% tolerance and 100 ppm/°C drift — far tighter than any standard Zener. It still requires an external series resistor to set the bias current, just as a Zener does."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040AIM3-3.0-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/LM4040AIM3-3.0-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}}