{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040CIM7X-2.5/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040CIM7X-2.5-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM4040CIM7X-2.5-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM4040CIM7X-2.5%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040CIM7X-2.5/NOPB precision shunt voltage reference, fixed 2.5 V output, ±0.5% tolerance, 35 µVrms noise, 100 ppm/°C drift, SC-70-5 package, -40°C to 85°C.","salesMarkdown":"## 2.5 V shunt reference in SC-70-5 — what you need to know The Texas Instruments LM4040CIM7X-2.5/NOPB is a precision shunt voltage reference delivering a fixed 2.5 V output with ±0.5% initial tolerance. It operates as a two-terminal shunt regulator — no external series resistor is needed, just a single resistor from the supply to the cathode to set the bias current. The SC-70-5 package occupies roughly 2.2 mm² of board area — about half the footprint of an SOT-23. That density comes with a trade-off: the small thermal mass limits the effective heat sinking, so the 15 mA maximum output current is realistically derated above 70 °C ambient. For most signal-chain roles — biasing an ADC reference input, setting a comparator threshold, or providing a precision pull-up — the actual load is under 1 mA, well within the safe operating area. This exact order code carries an Obsolete product status. Texas Instruments has ended production; no last-time-buy window remains open through the factory channel. The LM4040CIM7X-2.5/NOPB is available today only through independent distribution — surplus inventory, new-old-stock, or broker-sourced material. The LM4040 family includes active-grade options in the same SC-70-5 footprint (e.g. the LM4040AIM7X-2.5 with tighter ±0.1% tolerance), but those carry different tolerances and may not be drop-in replacements if the ±0.5% bin is specified in the BOM. A cross-reference evaluation against the active LM4040DIM7X-2.5 (0.5% tolerance, same package) is worth running if the design can accept a minor datasheet delta in temperature coefficient or noise. ## Noise and drift — the signal-chain limits The 35 µVrms noise spec over 10 Hz to 10 kHz is the wideband integrated figure — it includes the 1/f corner and the flatband white noise. For a 2.5 V reference, that works out to roughly 14 ppm-rms of the output voltage. In a 12-bit ADC system with a 2.5 V reference, the reference noise contribution sits at about 0.3 LSB — acceptable for most industrial sensing but marginal for 16-bit delta-sigma converters without additional filtering. Across the full 125 °C span, the worst-case drift adds ±12.5 mV to the initial tolerance error. That is roughly ±0.5% of the 2.5 V output — doubling the room-temperature tolerance band at the temperature extremes. Designs that need better than 1% total accuracy over temperature should consider the A-grade (±0.1%) or the LM4040 with lower drift. ## Shunt topology — bias resistor selection matters Because this is a shunt reference, the series resistor from the supply to the cathode must be sized to deliver the sum of the load current and the minimum cathode current (65 µA typ,) at the lowest supply voltage, while staying below the 15 mA maximum at the highest supply with no load. A common rule-of-thumb: bias the shunt at 100 µA to 1 mA for best noise and stability. The ±0.5% tolerance is the initial accuracy at 25 °C — the resistor tolerance adds directly to the system error budget.","metaTitle":"LM4040CIM7X-2.5/NOPB Shunt Voltage Reference, 2.5 V ±0.5%","metaDescription":"Texas Instruments LM4040CIM7X-2.5/NOPB precision shunt reference, fixed 2.5 V output, ±0.5% tolerance, SC-70-5.","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); Cut Tape (CT)","Tolerance":"±0.5%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"5-TSSOP, SC-70-5, SOT-353","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"15 mA","Current - Supply":"-","Current - Cathode":"65 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":"SC-70-5","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2997","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/db47fc1a31c797b619d88478be755429.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040CIM7X-2.5%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Is the LM4040CIM7X-2.5/NOPB obsolete?","answer":"Yes, the LM4040CIM7X-2.5/NOPB carries an Obsolete product status. Texas Instruments has ended production."},{"question":"What is the tolerance of the LM4040CIM7X-2.5/NOPB?","answer":"The initial tolerance is ±0.5%. This is the C-grade option in the LM4040 family — tighter than the D-grade (±1%) but looser than the A-grade (±0.1%)."},{"question":"What package does the LM4040CIM7X-2.5/NOPB come in?","answer":"It is supplied in a 5-lead SC-70-5 package, also known as SOT-353. The footprint is about 2.0 mm × 2.1 mm with 0.65 mm pin pitch."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040CIM7X-2.5-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040CIM7X-2.5-NOPB 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}}