{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL431BQPK","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL431BQPK","canonicalUrl":"https://icboms.com/texas-instruments/TL431BQPK","factsUrl":"https://icboms.com/api/mcp/products/TL431BQPK","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL431BQPK, adjustable shunt voltage reference, ±0.5% tolerance, 100 mA output, 2.495 V reference, -40°C to 125°C, SOT-89-3 package, surface mount.","salesMarkdown":"## Why the ±0.5% grade matters for your reference rail The TL431BQPK is a B-grade adjustable shunt voltage reference from TI's TL431 family, specified with a ±0.5% initial tolerance on the 2.495 V internal reference. That half-percent band is the difference between a supply rail that holds a 12-bit ADC's INL budget and one that drifts the output by several LSBs. For a 5 V output divider, ±0.5% translates to ±25 mV worst-case — tight enough for most precision analog and mixed-signal rails without needing a trim pot. ## 100 mA cathode current — what it buys you The 100 mA continuous cathode current rating determines how much load the shunt can drive while maintaining regulation. In a typical optocoupler feedback loop for an isolated power supply, the TL431BQPK biases the LED with a few milliamps; the 100 mA headroom means it can also sink the bias current of a secondary-side error amplifier or a small auxiliary load without dropping out of regulation. The base product number TL431 spans multiple tolerance grades and packages, so the BQPK suffix locks in the ±0.5% SOT-89-3 variant.","metaTitle":"TL431BQPK Shunt Voltage Reference, ±0.5%, SOT-89-3","metaDescription":"TL431BQPK adjustable shunt reference, ±0.5% tolerance, 100 mA output, -40°C to 125°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±0.5%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-243AA","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"100 mA","Current - Supply":"-","Current - Cathode":"700 µA","Base Product Number":"TL431","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"-","Operating Temperature":"-40°C~125°C(TA)","Voltage - Output (Max)":"36 V","Supplier Device Package":"SOT-89-3","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4500","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e8567ad04842692d5fb8309c69e90b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TL431BQPK/alternatives.json"},"ai":{"faq":[{"question":"Is TL431BQPK a direct replacement for TL431AC?","answer":"The TL431AC is a standard-grade (±1% or ±2% typical) part in a different package (usually TO-92 or SOIC-8). The TL431BQPK offers tighter ±0.5% tolerance and comes in SOT-89-3 surface-mount. They are functionally interchangeable in the same shunt regulator circuit, but the tolerance and package differ — verify the footprint and reference accuracy requirements before substituting."},{"question":"Is TL431BQPK RoHS compliant?","answer":"Confirm the specific date code and manufacturer's RoHS certificate for your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL431BQPK","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL431BQPK 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}}