{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040CEM3X-5.0","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040CEM3X-5.0","canonicalUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-5.0","factsUrl":"https://icboms.com/api/mcp/products/LM4040CEM3X-5.0","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040CEM3X-5.0 precision shunt voltage reference, Fixed 5V output, ±0.5% tolerance, 100 ppm/°C, 15 mA output, SOT-23-3, -40°C to 125°C.","salesMarkdown":"## 5V shunt reference in a SOT-23-3 — what it delivers The LM4040CEM3X-5.0 is a precision shunt voltage reference from Texas Instruments that delivers a fixed 5V output with ±0.5% initial tolerance. As a shunt reference, it behaves like a Zener diode — it regulates the voltage across its terminals by shunting current through the cathode. The minimum cathode current is 83 µA, which keeps the power budget low in battery-operated designs, while the maximum output current of 15 mA can drive modest loads or bias an ADC reference input. ## Tolerance and drift — the C-grade precision tier The ±0.5% initial accuracy and 100 ppm/°C temperature coefficient place this in the middle precision tier of the LM4040 family. For a 5V output, ±0.5% means the output at 25°C can be anywhere from 4.975V to 5.025V. This noise floor is acceptable for general-purpose reference duty; for noise-sensitive analog front-ends, a larger filter capacitor or a lower-noise reference like the LM4040A would be a better fit. Any stock in the market is new-old-stock or surplus inventory that has already left the factory. The package is Tape & Reel (TR) in a standard SOT-23-3 footprint (TO-236-3 / SC-59 / SOT-23-3). ## Pin-compatible replacement path The LM4040AIM3-5.0 is the most direct pin-compatible replacement. It shares the same SOT-23-3 footprint, fixed 5V output, and shunt topology, but upgrades the tolerance to ±0.1% and the temperature coefficient to 30 ppm/°C. The LM4040CEM3X-5.0 can be replaced by the LM4040AIM3-5.0 in any existing design without board changes — the only difference is tighter precision specs on the A-grade part. For a broader replacement search, any LM4040 variant with the same 5V fixed output in SOT-23-3 will be footprint-compatible. The tolerance and tempco grades (A, B, C, D) are the only parametric variables — the base die and pinout are identical across the family. The base product number LM4040 covers all these options.","metaTitle":"LM4040CEM3X-5.0 Shunt Reference, 5V ±0.5%, SOT-23-3","metaDescription":"Texas Instruments LM4040CEM3X-5.0 precision shunt voltage reference. Fixed 5V output, ±0.5% 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":"±0.5%","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":"83 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"80µVrms","Operating Temperature":"-40°C~125°C(TA)","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/8c40cf163b5cda64fd88ad5c9f25fe6d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040CEM3X-5.0/alternatives.json"},"ai":{"faq":[{"question":"What is a direct replacement for LM4040CEM3X-5.0?","answer":"The LM4040AIM3-5.0 is a direct pin-compatible replacement with the same 5V fixed output in the same SOT-23-3 package. Any LM4040 fixed 5V variant in SOT-23-3 will be footprint-compatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040CEM3X-5.0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040CEM3X-5.0 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}}