{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM385MX-1.2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM385MX-1.2","canonicalUrl":"https://icboms.com/texas-instruments/LM385MX-1.2","factsUrl":"https://icboms.com/api/mcp/products/LM385MX-1.2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM385MX-1.2, shunt voltage reference, 1.235V fixed output, -2.43%/+2.02% tolerance, 20 mA output, 15 µA cathode current, 60 µVrms noise, 0°C to 70°C, 8-SOIC.","salesMarkdown":"The LM385MX-1.2 is a fixed 1.235V shunt voltage reference from Texas Instruments, in an 8-SOIC surface-mount package. It is a two-terminal device that regulates voltage by shunting current to ground, requiring only a series resistor from the supply rail. Typical applications include low-drift bias supplies for op-amps, ADC references in instrumentation, and threshold-setting circuits in power supplies — any place a stable 1.235V rail is needed without a separate regulator. The output tolerance is asymmetric: -2.43% to +2.02% at 25°C. That means a 1.235V nominal output can sit anywhere from about 1.205V to 1.260V. For a 12-bit ADC reference, that's roughly ±10 LSBs of initial error — acceptable for many industrial control loops but not for precision metrology without a trim. Wideband noise is specified at 60 µVrms over 10 Hz to 10 kHz. In a low-noise bias circuit, that's about 49 ppm of the output voltage — clean enough for a 10-bit system but marginal for a 16-bit SAR ADC without post-filtering. The temperature coefficient is 150 ppm/°C. ## Obsolete — sourcing the LM385MX-1.2 today The LM385MX-1.2 is officially classified as obsolete by Texas Instruments. Expect to work with a procurement specialist to locate a lot that matches your quantity and date-code requirements. It reworks cleanly under hot air at 300°C to 350°C with a fine nozzle — the leads are visible and the thermal mass is low. No special bake-out is required for MSL Level 1 parts typical of this era.","metaTitle":"LM385MX-1.2 Shunt Voltage Reference, 1.235V Fixed, 8-SOIC","metaDescription":"Texas Instruments LM385MX-1.2 shunt reference, 1.235V fixed output, ±2.43%/+2.02% tolerance, 8-SOIC.","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":"-2.43%, +2.02%","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":"150ppm/°C","Voltage - Output (Min/Fixed)":"1.235V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9385","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM385MX-1.2/alternatives.json"},"ai":{"faq":[{"question":"Is LM385MX-1.2 obsolete?","answer":"Yes, the LM385MX-1.2 is obsolete. Texas Instruments has discontinued production, and no last-time-buy window is currently open. The part must be sourced through the surplus and broker channel."},{"question":"What is the replacement for LM385MX-1.2?","answer":"No official replacement is listed by Texas Instruments for the LM385MX-1.2. A common cross-shop candidate is the LM385BX series, which offers tighter tolerance (typically ±1%), but the exact pin-compatible substitute depends on your tolerance and temperature requirements. For new designs, consider the LM4040 or LM4050 series in the same SOT-23 or SOIC footprint."},{"question":"What is the accuracy of LM385MX-1.2?","answer":"The initial tolerance is -2.43% to +2.02% at 25°C."},{"question":"Where can I buy LM385MX-1.2?","answer":"The LM385MX-1.2 is obsolete and not stocked in regular distribution. Contact us with your target quantity and date-code preference for a current quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM385MX-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/LM385MX-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}}