{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM385PSRG4-1-2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM385PSRG4-1-2","canonicalUrl":"https://icboms.com/texas-instruments/LM385PSRG4-1-2","factsUrl":"https://icboms.com/api/mcp/products/LM385PSRG4-1-2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM385PSRG4-1-2, shunt voltage reference, fixed 1.235V output, ±2% tolerance, 60µVrms noise, 20ppm/°C typical drift, 20mA output, 8-SOIC surface mount, 0°C~70°C.","salesMarkdown":"## Fixed 1.235V shunt reference — obsolete, but still spec'd into legacy BOMs The Texas Instruments LM385PSRG4-1-2 is a fixed 1.235V shunt voltage reference in an 8-SOIC package. Minimum cathode current is 15 µA, and the device can sink up to 20 mA. If you are qualifying a replacement, the search starts with the 1.235V fixed output, shunt topology, and 8-SOIC footprint. The base product number LM385 family includes multiple tolerance and temperature-grade variants — but this specific PSRG4 suffix is the one that matches the original BOM line. ## Noise and drift — where the 60µVrms matters The 60µVrms noise figure (10 Hz to 10 kHz) is a genuine differentiator for a shunt reference in this voltage class. It keeps the reference contribution below 1 LSB for a 12-bit ADC with a 2.5V full-scale range, which is why this part shows up in older instrumentation and sensor-conditioning boards. The 20ppm/°C typical drift adds about 25 µV over a 70°C span — acceptable for 0.1% system accuracy but not for 16-bit designs without calibration.","metaTitle":"TI LM385PSRG4-1-2 Shunt Voltage Reference, 1.235V Fixed","metaDescription":"Texas Instruments LM385PSRG4-1-2 shunt voltage reference, fixed 1.235V output, ±2% tolerance, 60µVrms noise, 8-SOIC package.","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":"±2%","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.209\\\", 5.30mm 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-SO","Temperature Coefficient":"20ppm/°CTypical","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/LM385PSRG4-1-2/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM385PSRG4-1-2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM385PSRG4-1-2 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}}