{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM431AIM","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM431AIM","canonicalUrl":"https://icboms.com/texas-instruments/LM431AIM","factsUrl":"https://icboms.com/api/mcp/products/LM431AIM","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM431AIM adjustable shunt voltage reference, ±2.2% tolerance, 100 mA output, 2.495V to 37V range, 50ppm/°C typical tempco, -40°C to 85°C, 8-SOIC.","salesMarkdown":"## 8-SOIC adjustable shunt reference — parametric scope The Texas Instruments LM431AIM is a three-terminal adjustable shunt voltage reference in an 8-SOIC package — the same industry-standard footprint as the TL431 family, but specified with a ±2.2% initial tolerance and a 50ppm/°C typical temperature coefficient. Output is adjustable from a 2.495 V minimum up to 37 V, with a 100 mA cathode current capability that covers biasing optocouplers, setting error-amplifier references in off-line supplies, or clamping protection rails. ## Tolerance and tempco — where the ±2.2% grade lands The ±2.2% tolerance at 25°C is the middle-grade variant in the LM431 family — tighter than the standard ±2.5% bin, but not the precision ±1% or ±0.5% grades. The 1 mA minimum cathode current is the quiescent floor — below that the shunt loses regulation. At the 100 mA maximum, the 8-SOIC's thermal impedance becomes the limiting factor; the device dissipates about 370 mW at full output and 37 V drop, which stays within the package's SOA at 85°C ambient. ## TL431 functional equivalence — what swaps and what doesn't The TL431IDBVR shares the same basic shunt reference topology and the same ±2.2% tolerance grade, but comes in an SOT-23-5 package with a tape-and-reel format — the LM431AIM's 8-SOIC body is wider and has a different pinout (the TL431 uses pin 1 as cathode, while the LM431AIM follows the standard SOIC pin assignment). The parametric core — 2.495 V reference, 100 mA output, 50ppm/°C tempco — is identical, so a board spin or adapter footprint is needed for direct swap.","metaTitle":"Texas Instruments LM431AIM Adjustable Shunt Reference","metaDescription":"Texas Instruments LM431AIM adjustable shunt voltage reference, ±2.2% tolerance, 100 mA output, 2.495V to 37V range, 50ppm/°C tempco, -40°C to 85°C, 8-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Bulk","Tolerance":"±2.2%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Reference Type":"Shunt","lifecycle_stage":"eol_hot","Current - Output":"100 mA","Current - Cathode":"1 mA","Operating Temperature":"-40°C ~ 85°C (TA)","Voltage - Output (Max)":"37 V","Supplier Device Package":"8-SOIC","Temperature Coefficient":"50ppm/°C Typical","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.81","priceTiers":[{"qty":369,"price":"$0.81000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/27996754917e0ba51b0677530ec35cf7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM431AIM/alternatives.json"},"ai":{"faq":[{"question":"Is LM431AIM equivalent to TL431?","answer":"Functionally yes — both are adjustable shunt references with the same 2.495 V reference, ±2.2% tolerance, and 100 mA output capability. The difference is package and pinout: the LM431AIM comes in an 8-SOIC, while the TL431IDBVR is an SOT-23-5. A direct drop-in replacement requires matching the pin assignment on the PCB."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM431AIM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM431AIM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}