{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040B82IDBZT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040B82IDBZT","canonicalUrl":"https://icboms.com/texas-instruments/LM4040B82IDBZT","factsUrl":"https://icboms.com/api/mcp/products/LM4040B82IDBZT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040B82IDBZT, precision shunt voltage reference, 8.192 V fixed output, ±0.2% tolerance, 100 ppm/°C, 15 mA output, SOT-23-3, Tape & Reel.","salesMarkdown":"## 8.192 V shunt reference — what it does for the precision rail The Texas Instruments LM4040B82IDBZT is a precision shunt voltage reference delivering a fixed 8.192 V output with an initial tolerance of ±0.2%. That 8.192 V level is a common anchor for 12-bit and 14-bit ADC reference inputs, comparator thresholds, and DAC scaling — the value sits just below the 10 V ceiling many industrial signal chains use, giving headroom for the op-amp rails. As a shunt (two-terminal) reference, it behaves like a precision Zener diode: you bias it with a resistor from a higher supply rail, and the device sinks enough cathode current (110 µA typical) to regulate the output. The 15 mA maximum output current limits the load it can drive directly — plan for a buffer if the reference feeds more than a single ADC reference input or a handful of comparators. The ±0.2% initial tolerance means a fresh part reads between 8.176 V and 8.208 V at 25 °C — tight enough for a 12-bit system where 1 LSB at 8.192 V reference is 2 mV. Noise is specified at 130 µVrms over a 10 Hz to 10 kHz bandwidth — that is about 16 ppm of the 8.192 V output. For a 12-bit ADC with a 2 mV LSB, the noise contribution is roughly 6% of one LSB, which is acceptable for most industrial measurements but worth noting for metrology-grade applications that would reach for a lower-noise bandgap reference. ## Sourcing an obsolete part — what to expect Because this is a shunt reference in a common SOT-23-3 package, the replacement path is not a single pin-compatible drop-in — the LM4040 family spans multiple voltage options and tolerance grades (A, B, C, D, E). If the B-grade ±0.2% tolerance is not critical, a C-grade (±0.5%) or D-grade (±1%) sibling may be easier to source. The 8.192 V output voltage is the binding constraint; changing it shifts the entire ADC reference or comparator threshold.","metaTitle":"LM4040B82IDBZT Shunt Voltage Reference, 8.192 V, ±0.2%","metaDescription":"TI LM4040B82IDBZT precision shunt reference: 8.192 V fixed output, ±0.2% tolerance, 100 ppm/°C drift, SOT-23-3.","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)","Tolerance":"±0.2%","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":"110 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"130µVrms","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"8.192V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4700","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040B82IDBZT/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040B82IDBZT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040B82IDBZT 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}}