{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040C30IDBZTG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040C30IDBZTG4","canonicalUrl":"https://icboms.com/texas-instruments/LM4040C30IDBZTG4","factsUrl":"https://icboms.com/api/mcp/products/LM4040C30IDBZTG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040C30IDBZTG4, precision shunt voltage reference, fixed 3 V output, ±0.5% tolerance, 35 µVrms noise, 100 ppm/°C drift, SOT-23-3 package, -40°C to 85°C.","salesMarkdown":"## Fixed 3 V shunt reference for precision bias and ADC references It operates as a shunt regulator, meaning it sinks current from a series resistor to maintain the output voltage, making it suitable for low-power bias circuits, ADC/DAC reference inputs, and comparator threshold generation. ## Noise and drift — the accuracy budget Output noise is specified at 35 µVrms over 10 Hz to 10 kHz, which sets the noise floor for a 12-bit or 14-bit ADC reference. The part comes in a SOT-23-3 package (also listed as TO-236-3 / SC-59), a common three-pin surface-mount footprint with 0.95 mm pitch. The small size fits densely populated boards, but the thermal pad is the cathode — the board copper area under the package sets the effective thermal resistance for the 15 mA output current capability. ## Cathode current and shunt operation Minimum cathode current is 82 µA, which is the quiescent current the shunt needs to regulate. The maximum output current is 15 mA, limited by the package dissipation. In a typical application, a series resistor from the supply to the cathode sets the total current — the load plus the 82 µA minimum — so the resistor value must be chosen to keep the shunt in regulation over the full load and supply range. No official second-source or successor is listed, but the LM4040 family includes multiple voltage options in the same SOT-23-3 footprint for design flexibility.","metaTitle":"TI LM4040C30IDBZTG4 Shunt Voltage Reference, 3 V ±0.5%","metaDescription":"Texas Instruments LM4040C30IDBZTG4 precision shunt reference: fixed 3 V output, ±0.5% tolerance, 35 µVrms noise, 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)","Tolerance":"±0.5%","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":"15 mA","Current - Supply":"-","Current - Cathode":"82 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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040C30IDBZTG4/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance of the LM4040C30IDBZTG4?","answer":"Initial tolerance is ±0.5%. This is the 'C' grade in the ordering code — TI also offers ±0.1% and ±0.2% grades in the same family."},{"question":"Is the LM4040C30IDBZTG4 RoHS compliant?","answer":"The LM4040C30IDBZTG4 is listed with a Tape & Reel packaging suffix (G4) that typically indicates RoHS compliance per TI's green packaging policy. No explicit RoHS certificate is in this record, but the G4 suffix is TI's standard for lead-free/RoHS-compliant parts."},{"question":"Can the LM4040C30IDBZTG4 replace the LM4040C25?","answer":"The LM4040C30IDBZTG4 is a 3 V reference; the LM4040C25 is a 2.5 V reference. They share the same SOT-23-3 footprint and pinout, so a board designed for the 2.5 V part can accept the 3 V part with a resistor value change to set the correct cathode current. The output voltage difference means the reference voltage to the ADC or comparator will shift — confirm the system can tolerate the change."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040C30IDBZTG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040C30IDBZTG4 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}}