{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040C30IDBZRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040C30IDBZRG4","canonicalUrl":"https://icboms.com/texas-instruments/LM4040C30IDBZRG4","factsUrl":"https://icboms.com/api/mcp/products/LM4040C30IDBZRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040C30IDBZRG4, precision shunt voltage reference, 3 V fixed output, ±0.5% tolerance, 100 ppm/°C, SOT-23-3, Tape & Reel.","salesMarkdown":"It operates as a shunt (two-terminal) reference, meaning it regulates voltage by shunting current through the device — similar to a Zener diode but with tighter accuracy and lower temperature drift. The SOT-23-3 package (TO-236-3, SC-59 alternative) is a common small-signal footprint, making this a straightforward drop-in for designs already using a 3 V shunt reference in that package. ## Cathode current and noise — sizing the bias resistor The device sinks up to 15 mA output current, with a minimum cathode current of 82 µA needed to maintain regulation. That 82 µA floor sets the minimum bias current through the external resistor from the supply rail — a common gotcha when designers assume a shunt reference draws negligible current. Wideband noise is specified at 35 µVrms over the 10 Hz to 10 kHz band. For a 3 V reference, that is about 12 ppm of the output — clean enough for a 12-bit ADC reference path, though a 16-bit system may want a lower-noise grade. ## Pin-compatible alternatives in the LM4040 family The base product number LM4040 covers a range of voltage options (2.048 V, 2.5 V, 3 V, 4.096 V, 5 V, etc.) and tolerance grades (0.1%, 0.2%, 0.5%, 1%) all in the same SOT-23-3 footprint.","metaTitle":"LM4040C30IDBZRG4 Shunt Voltage Reference, 3 V Fixed, ±0.5%","metaDescription":"Texas Instruments LM4040C30IDBZRG4 precision shunt reference, 3 V fixed output, ±0.5% tolerance, 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/LM4040C30IDBZRG4/alternatives.json"},"ai":{"faq":[{"question":"Can the LM4040C30IDBZRG4 replace the LM4040C30IDBZR?","answer":"Yes — the LM4040C30IDBZR is the same die and electrical specification (3 V, ±0.5%, SOT-23-3) in a different packaging format. The LM4040C30IDBZRG4 is the Tape & Reel variant; the LM4040C30IDBZR ships in tube or bulk. Pin-for-pin compatible, same performance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040C30IDBZRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040C30IDBZRG4 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}}