{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM385BYMX-1.2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM385BYMX-1.2","canonicalUrl":"https://icboms.com/texas-instruments/LM385BYMX-1.2","factsUrl":"https://icboms.com/api/mcp/products/LM385BYMX-1.2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM385BYMX-1.2, shunt voltage reference, fixed 1.235 V output, ±1% tolerance, 50 ppm/°C temperature coefficient, 60 µVrms noise, 8-SOIC package, commercial temp 0°C~70°C.","salesMarkdown":"## 1.235 V shunt reference — obsolete but still on BOMs The Texas Instruments LM385BYMX-1.2 is a precision shunt voltage reference delivering a fixed 1.235 V output with ±1% initial tolerance. As a shunt (two-terminal) reference, it behaves like a Zener diode — it regulates voltage by shunting current through the cathode, requiring only a series resistor from the supply. The minimum cathode current is 15 µA, and it can sink up to 20 mA of output current. ## 50 ppm/°C drift and 60 µVrms noise — the precision angles The temperature coefficient is 50 ppm/°C, which means the output voltage shifts by about 62 µV per °C from the 1.235 V nominal. Over the full 0°C to 70°C range, that adds up to roughly 4.3 mV of total drift — acceptable for 8-bit or low-end 10-bit ADC references, but not for higher-resolution systems without calibration. Low-frequency noise is specified at 60 µVrms over the 10 Hz to 10 kHz band. This is the integrated noise that appears at the reference output and couples into the ADC or comparator input — a key figure for precision measurement circuits.","metaTitle":"LM385BYMX-1.2 Shunt Voltage Reference, 1.235 V, ±1%","metaDescription":"LM385BYMX-1.2 shunt voltage reference from Texas Instruments. Fixed 1.235 V output, ±1% tolerance, 50 ppm/°C drift, 60 µVrms noise.","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":"±1%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Obsolete","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"20 mA","Current - Supply":"-","Current - Cathode":"15 µA","Base Product Number":"LM385","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"60µVrms","Operating Temperature":"0°C~70°C(TA)","Supplier Device Package":"8-SOIC","Temperature Coefficient":"50ppm/°C","Voltage - Output (Min/Fixed)":"1.235V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM385BYMX-1.2/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for LM385BYMX-1.2?","answer":"For a pin-compatible drop-in, check the broader LM385 family (e.g., LM385B series in the same 8-SOIC package) — but confirm the tolerance and temperature grade match your BOM requirements."},{"question":"What is the tolerance of LM385BYMX-1.2?","answer":"The initial tolerance is ±1%."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM385BYMX-1.2","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-1.2 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}}