{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040DEM3-3.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040DEM3-3.0","canonicalUrl":"https://icboms.com/texas-instruments/LM4040DEM3-3.0","factsUrl":"https://icboms.com/api/mcp/products/LM4040DEM3-3.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040DEM3-3.0, precision shunt voltage reference, fixed 3 V output, ±1% tolerance, 15 mA output, 75 µA cathode current, SOT-23-3, -40°C to 125°C.","salesMarkdown":"## 3 V shunt reference — what the ±1% tolerance buys the design The LM4040DEM3-3.0 is a fixed 3 V shunt voltage reference from the LM4040 family, housed in a SOT-23-3 package. The ±1% initial tolerance sets the reference accuracy floor — adequate for 8- to 10-bit ADC/DAC systems or comparator thresholds where a tight bandgap is not required. The shunt topology means it behaves like a Zener diode: a series resistor from the supply to the cathode sets the bias current, and the reference regulates the cathode voltage to 3 V as long as the cathode current stays between 75 µA and 15 mA. ## Temperature range and noise — industrial-grade reference The 150 ppm/°C temperature coefficient means the output can drift up to 45 mV across the full temperature range from the 3 V nominal — a 1.5 % shift that may require calibration in a 12-bit system. The LM4040DEM3-3.0 is marked obsolete. Buyers sourcing this part should expect to procure it through independent distribution or surplus channels. No official successor is listed on the record, so a pin-compatible replacement must be validated against the BOM's voltage and tolerance requirements.","metaTitle":"LM4040DEM3-3.0 Shunt Voltage Reference, 3 V ±1%, Obsolete","metaDescription":"LM4040DEM3-3.0 precision shunt reference, fixed 3 V output, ±1% tolerance, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","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":"Obsolete","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"15 mA","Current - Supply":"-","Current - Cathode":"75 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)":"3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8c40cf163b5cda64fd88ad5c9f25fe6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040DEM3-3.0/alternatives.json"},"ai":{"faq":[{"question":"Is LM4040DEM3-3.0 obsolete or end of life?","answer":"Yes, the LM4040DEM3-3.0 is listed as obsolete. It is no longer manufactured by Texas Instruments. Buyers should plan for a last-time-buy or a replacement part for new designs."},{"question":"What is a replacement for LM4040DEM3-3.0?","answer":"No official replacement is listed on the record. A pin-compatible alternative in the same shunt reference family with a 3 V output and ±1% tolerance should be validated against the BOM's temperature range and package requirements. The LM4040 series includes active variants — confirm the exact suffix and tolerance grade for your design."},{"question":"What is the accuracy of LM4040DEM3-3.0?","answer":"The LM4040DEM3-3.0 has a ±1% initial tolerance on the 3 V fixed output. The temperature coefficient is 150 ppm/°C, and noise is 35 µVrms over 10 Hz to 10 kHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040DEM3-3.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040DEM3-3.0 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}}