{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM385BYM-2.5/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM385BYM-2.5-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM385BYM-2.5-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM385BYM-2.5%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM385, 2.5V Fixed Shunt Voltage Reference, ±1.5% Tolerance, 20 mA Output, 20 µA Cathode Current, 50 ppm/°C, 120 µVrms Noise, 0°C to 70°C, 8-SOIC Surface Mount, Bulk.","salesMarkdown":"## 2.5 V fixed shunt — the tolerance and drift that set your error budget The LM385BYM-2.5/NOPB is a precision 2.5 V shunt voltage reference from Texas Instruments, delivering a fixed output with ±1.5% initial tolerance and a 50 ppm/°C temperature coefficient. For a 0°C to 70°C span, that drift adds up to 3.5 mV of additional error — a figure the system designer must budget against the ADC or comparator threshold window. Output noise is specified at 120 µVrms over the 10 Hz to 10 kHz band, making this reference suitable for 12-bit and some 14-bit ADC applications where the noise floor sits below 1 LSB. The shunt architecture means the part regulates by shunting current away from the load — the series resistor sets the total current, and the 20 µA minimum cathode current defines the lower bound for stable operation. ## Output current and bias — sizing the series resistor The LM385BYM-2.5/NOPB can sink up to 20 mA of output current while maintaining regulation. The cathode current must stay above 20 µA for the reference to operate correctly — below that threshold the shunt loses its voltage-stiffness. In practice, the designer picks a series resistor that delivers (Vin – 2.5 V) / R such that the total current (load + 20 µA minimum) stays within the 20 mA ceiling across all load and line conditions. For extended industrial or automotive environments, a wider-temperature sibling in the LM385 family would be needed.","metaTitle":"LM385BYM-2.5/NOPB Shunt Voltage Reference, 2.5V Fixed, ±1.5%","metaDescription":"Texas Instruments LM385BYM-2.5/NOPB precision 2.5V shunt reference. ±1.5% tolerance, 20 mA output, 50 ppm/°C drift, 120 µVrms noise. Active, 8-SOIC package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Bulk","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/86bfe91a3e6bfbad13e3b30fd40f6a58.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM385BYM-2.5%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Is LM385BYM-2.5/NOPB obsolete or still active?","answer":"There is no discontinuation notice or last-time-buy date associated with this order code."},{"question":"What is the accuracy of LM385BYM-2.5/NOPB?","answer":"Initial accuracy is ±1.5% of the 2.5 V nominal output. Noise contributes 120 µVrms (10 Hz–10 kHz). For a 12-bit ADC with a 2.5 V reference, the combined error from tolerance, drift, and noise stays under 1 LSB in most designs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM385BYM-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/LM385BYM-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}}