{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040BIM3-3.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040BIM3-3.0","canonicalUrl":"https://icboms.com/texas-instruments/LM4040BIM3-3.0","factsUrl":"https://icboms.com/api/mcp/products/LM4040BIM3-3.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040BIM3-3.0 precision shunt voltage reference, fixed 3 V output, ±0.2% tolerance, 67 µA cathode current, 15 mA output, SOT-23-3 package, -40°C to 85°C.","salesMarkdown":"## 3 V shunt reference — what the ratings tell you It is a precision shunt — it regulates by shunting current through the cathode to ground, so it needs a series resistor from the supply rail, not a separate input pin. The ±0.2% initial tolerance and 100 ppm/°C temperature coefficient mean this reference holds 3 V within 6 mV at 25 °C, and drifts about 0.3 mV over a 30 °C swing. That is tight enough for a 10-bit ADC reference or a comparator threshold. Cathode current is 67 µA typical — the minimum current needed to keep the shunt regulating. The device can sink up to 15 mA at the output, so the series resistor must be sized so the cathode current stays above 67 µA at minimum supply and maximum load. ## Sourcing an obsolete precision reference The LM4040BIM3-3.0 is listed as Obsolete on the lifecycle record. SOT-23-3 (TO-236-3, SC-59) — three leads, 1.5 mm pitch, 2.9 mm body length. The footprint is standard for small-signal transistors and references; it fits a 3-pin SOT-23 land pattern. Surface-mount only.","metaTitle":"LM4040BIM3-3.0 Shunt Voltage Reference, ±0.2%, SOT-23-3","metaDescription":"Precision 3V shunt reference in SOT-23-3. ±0.2% tolerance, 67 µA cathode current, -40°C to 85°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":"±0.2%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Last Time Buy","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":"$0.7850","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/93e806034867a3db3fae2a3c2b61e556.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040BIM3-3.0/alternatives.json"},"ai":{"faq":[{"question":"What is the accuracy of LM4040BIM3-3.0?","answer":"The initial tolerance is ±0.2%, and the temperature coefficient is 100 ppm/°C. At 3 V output, that means the voltage is within ±6 mV at 25 °C, with about 0.3 mV drift over a 30 °C temperature change."},{"question":"What is the cathode current of LM4040BIM3-3.0?","answer":"The typical cathode current is 67 µA. This is the minimum current the shunt needs to regulate. The output can sink up to 15 mA, so the external series resistor must be chosen to keep the cathode current above 67 µA across the supply and load range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040BIM3-3.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040BIM3-3.0 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}}