{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM431BCM3-NS","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM431BCM3-NS","canonicalUrl":"https://icboms.com/texas-instruments/LM431BCM3-NS","factsUrl":"https://icboms.com/api/mcp/products/LM431BCM3-NS","rawCanonicalId":null},"summary":{"shortDescription":"National Semiconductor LM431BCM3-NS adjustable shunt voltage reference, ±1% tolerance, 2.495V min / 37V max output, 100 mA cathode current, SOT-23-3 surface mount, 0°C to 70°C operating temperature.","salesMarkdown":"## Shunt reference for commercial bias and regulation The LM431BCM3-NS from National Semiconductor is a three-terminal adjustable shunt voltage reference in a SOT-23-3 surface-mount package. It delivers a programmable output from 2.495 V up to 37 V with ±1% initial tolerance, sinking up to 100 mA through the cathode. The part requires a minimum cathode current of 1 mA to maintain regulation and is specified over the 0°C to 70°C commercial temperature range. Typical applications include precision shunt regulators, series-pass voltage references, current limiters, and error amplifiers in power supplies and bias circuits for indoor, temperature-controlled equipment. ## Cathode current and load driving The 100 mA maximum cathode current defines load sinking capability. The 1 mA minimum cathode current sets a floor on the bias resistor value. ## Package and mounting Supplied in SOT-23-3 (TO-236-3 / SC-59) surface-mount package. The small footprint suits dense PCB layouts but limits thermal dissipation. ## Lifecycle and compliance Product status is Active per the manufacturer. The part is marked as RoHS non-compliant, which means it contains lead (Pb) and is not exempt for most new EU-market products. Check your regional RoHS exemption status before specifying.","metaTitle":"LM431BCM3-NS Adjustable Shunt Voltage Reference, ±1%","metaDescription":"LM431BCM3-NS adjustable shunt voltage reference, ±1% tolerance, 2.495V min output, 37V max, 100mA cathode current, SOT-23-3, 0°C~70°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Tolerance":"±1%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Reference Type":"Shunt","lifecycle_stage":"eol_hot","Current - Output":"100 mA","Current - Cathode":"1 mA","Operating Temperature":"0°C ~ 70°C (TA)","Voltage - Output (Max)":"37 V","Supplier Device Package":"SOT-23-3","Temperature Coefficient":"50ppm/°C Typical","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8","stockQuantity":0,"priceTiers":[{"qty":377,"price":"$0.80000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/27996754917e0ba51b0677530ec35cf7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between the LM431BCM3 and LM431BCM3-NS?","answer":"The suffix '-NS' typically indicates a non-standard packaging or marking variant from National Semiconductor. Electrically, the LM431BCM3-NS shares the same shunt reference core with ±1% tolerance, 2.495 V to 37 V output range, and 100 mA cathode current. The primary difference is the shipping medium — the '-NS' variant is supplied in Bulk rather than the standard tape-and-reel. Verify the exact order code against your BOM line; the electrical characteristics are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM431BCM3-NS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM431BCM3-NS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}