{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM385BYMX-2.5/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM385BYMX-2.5-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM385BYMX-2.5-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM385BYMX-2.5%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM385 series, Shunt Voltage Reference, LM385BYMX-2.5/NOPB, Fixed 2.5V output, ±1.5% tolerance, 20 mA output, 20 µA cathode current, 8-SOIC, 0°C~70°C.","salesMarkdown":"## 2.5 V fixed shunt reference — what the ±1.5% tolerance buys the design The LM385BYMX-2.5/NOPB from Texas Instruments is a 2.5 V fixed-output shunt voltage reference in an 8-SOIC surface-mount package. The ±1.5% initial tolerance means the output sits between 2.4625 V and 2.5375 V at 25 °C — tight enough for a 12-bit ADC reference without external trimming, but not a 16-bit precision rail. The shunt topology lets it operate from a single resistor, which simplifies the BOM but forces the designer to size the bias resistor for the full load current range. ## Biasing the shunt — 20 µA cathode current sets the resistor The minimum cathode current is 20 µA — the bias resistor must deliver at least that plus the load current to keep the reference in regulation. Maximum output current is 20 mA, so the resistor value is chosen to supply the total current at the minimum supply voltage. The 120 µVrms noise (10 Hz to 10 kHz) and 50 ppm/°C temperature coefficient are the specs that matter when this reference feeds a precision ADC or a sensor bridge — the noise floor limits the effective resolution, and the drift shifts the output over temperature.","metaTitle":"TI LM385BYMX-2.5/NOPB 2.5V Shunt Reference, ±1.5%","metaDescription":"Texas Instruments LM385BYMX-2.5/NOPB is a 2.5V fixed shunt voltage reference in 8-SOIC. ±1.5% tolerance, 20 mA output, 120 µVrms noise.","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":"±1.5%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"20 mA","Current - Supply":"-","Current - Cathode":"20 µA","Base Product Number":"LM385","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"120µVrms","Operating Temperature":"0°C~70°C(TA)","Supplier Device Package":"8-SOIC","Temperature Coefficient":"50ppm/°C","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9405","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1d0994349221fdb4ebddbdb4113bddcd.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM385BYMX-2.5%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"What is the tolerance of LM385BYMX-2.5/NOPB?","answer":"The initial output voltage tolerance is ±1.5% at 25 °C. For a 2.5 V reference, the output range is 2.4625 V to 2.5375 V."},{"question":"Can LM385BYMX-2.5/NOPB replace LM385Z-2.5?","answer":"Both are 2.5 V shunt references from the same LM385 family, but the LM385BYMX-2.5/NOPB is in an 8-SOIC surface-mount package, while the LM385Z-2.5 is typically in a TO-92 through-hole package. The electrical specs are similar, but the footprint and mounting are different — verify the board layout before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM385BYMX-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/LM385BYMX-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}}