{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040A30IDBZTG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040A30IDBZTG4","canonicalUrl":"https://icboms.com/texas-instruments/LM4040A30IDBZTG4","factsUrl":"https://icboms.com/api/mcp/products/LM4040A30IDBZTG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040A30IDBZTG4, precision shunt voltage reference, 3V fixed output, ±0.1% tolerance, 35 µVrms noise, 100 ppm/°C drift, SOT-23-3 package, -40°C to 85°C.","salesMarkdown":"## 3V shunt reference — what the tolerance and noise mean for your analog rail The LM4040A30IDBZTG4 is a fixed 3V shunt reference from TI's LM4040 family, specified with ±0.1% initial tolerance and 35 µVrms noise over a 10 Hz to 10 kHz bandwidth. That tolerance places it in the precision tier — good for a 12-bit ADC reference without external trimming, and the noise floor is low enough that it won't dominate the LSB budget in most 12- to 14-bit signal chains. The shunt architecture means it operates like a two-terminal Zener: you bias it through a series resistor from a higher-voltage rail, and the reference draws whatever cathode current it needs to regulate at 3V. Minimum cathode current is 82 µA, maximum output current is 15 mA — the external resistor must be sized to supply both the load and the reference's own quiescent current across the input voltage range. ## Temperature drift and operating range For a 12-bit system with a 3V reference (0.73 mV LSB), that drift consumes about 40% of one LSB — acceptable for most industrial control loops, but worth noting if you're targeting 14-bit or better without calibration. The SOT-23-3 package (TO-236-3 / SC-59 compatible) keeps the board footprint small — about 2.9 mm × 1.3 mm — and the surface-mount assembly is straightforward for standard reflow profiles. No exposed pad, so thermal management is via the PCB copper connected to the cathode pin.","metaTitle":"Texas Instruments LM4040A30IDBZTG4 Shunt Voltage Reference","metaDescription":"Precision 3V shunt reference from TI, ±0.1% tolerance, 35 µVrms noise, SOT-23-3. Active production.","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":"±0.1%","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":"$2.9700","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040A30IDBZTG4/alternatives.json"},"ai":{"faq":[{"question":"Can LM4040A30IDBZTG4 be replaced with LM4040A30IDBZT?","answer":"The LM4040A30IDBZT is the same die in an alternate tape-and-reel packaging suffix. Electrically they are identical — same 3V output, same ±0.1% tolerance, same SOT-23-3 package. The 'G4' suffix on this variant indicates TI's green/RoHS-compliant plating finish. Both are active and interchangeable in the same PCB footprint, provided your assembly line accepts the reel format difference."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040A30IDBZTG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040A30IDBZTG4 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}}