{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM4040B50IDCKR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM4040B50IDCKR","canonicalUrl":"https://icboms.com/texas-instruments/LM4040B50IDCKR","factsUrl":"https://icboms.com/api/mcp/products/LM4040B50IDCKR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM4040B50IDCKR precision shunt voltage reference, fixed 5V output, ±0.2% tolerance, 100 ppm/°C drift, 95 µA cathode current, SC-70-5 package, -40°C to 85°C.","salesMarkdown":"## Fixed 5V shunt — the tolerance grade that matters That B-grade tolerance is the middle tier in the LM4040 family — tighter than the ±0.5% A-grade but looser than the ±0.1% C-grade. For a 12-bit ADC with a 5V reference, the ±0.2% error eats about 8 LSBs of the full-scale budget; if your system needs better than 10-bit absolute accuracy, you step up to the C-grade. ## 100 ppm/°C drift — what it means across temperature The temperature coefficient is 100 ppm/°C, which translates to a 5 mV shift over a 100°C span (say from -40°C to 60°C). That's fine for a 12-bit system where the LSB is 1.22 mV — the drift adds about 4 LSBs of error worst-case. For a 16-bit ADC (76 µV LSB), that same drift swamps the lower bits, so this part fits best in 10- to 12-bit precision loops or as a comparator threshold where absolute voltage matters less than stability. ## SC-70-5 footprint and cathode current Housed in the SC-70-5 (SOT-353) package, this reference takes minimal board area — about 2.1 mm × 2.0 mm. The shunt architecture needs a cathode current of 95 µA minimum to regulate, and it can sink up to 15 mA. That 95 µA quiescent floor means the series resistor must be sized to deliver at least that current at the lowest input voltage, plus whatever load current the reference drives. No end-of-life notice, no last-time-buy deadline.","metaTitle":"TI LM4040B50IDCKR 5V Shunt Voltage Reference","metaDescription":"Texas Instruments LM4040B50IDCKR precision shunt voltage reference, fixed 5V output, ±0.2% initial tolerance, 100 ppm/°C drift, SC-70-5 package.","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); Cut Tape (CT)","Tolerance":"±0.2%","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":"95 µA","Base Product Number":"LM4040","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"80µVrms","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"SC-70-5","Temperature Coefficient":"100ppm/°C","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1445","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM4040B50IDCKR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LM4040B50IDCKR?","answer":"Within the same LM4040 family, the A-grade (LM4040A50IDCKR, ±0.5%) and C-grade (LM4040C50IDCKR, ±0.1%) are pin-compatible in the same SC-70-5 package. The only difference is the initial tolerance — footprint and pinout are identical."},{"question":"Is LM4040B50IDCKR RoHS compliant?","answer":"Confirm the specific date-code compliance certificate with your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM4040B50IDCKR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM4040B50IDCKR 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}}