{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL431BCDR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL431BCDR","canonicalUrl":"https://icboms.com/texas-instruments/TL431BCDR","factsUrl":"https://icboms.com/api/mcp/products/TL431BCDR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL431BCDR, adjustable precision shunt regulator, 2.495V reference, ±0.5% tolerance, 100 mA output, 8-SOIC surface mount, 0°C to 70°C.","salesMarkdown":"## Adjustable shunt regulator with a ±0.5% ceiling It provides a 2.495 V reference voltage at the cathode when the reference pin is tied to the cathode, and can be set to any higher voltage up to 36 V with two external resistors. The ±0.5% tolerance on the reference voltage is the B-grade precision tier — tighter than the ±1% TL431A and the ±2% TL431C, making it the choice for designs that need better than 1% initial accuracy without moving to an expensive bandgap reference. The 100 mA output current rating sets the maximum continuous current the shunt can sink while maintaining regulation. In a typical shunt regulator configuration, the series resistor from the supply to the cathode must be sized so that the cathode current stays above the 600 µA minimum and below 100 mA across all load and line conditions. If the load draws more than 100 mA, the cathode voltage rises and regulation is lost — the design needs a higher-current shunt or a series-pass transistor. The 600 µA minimum cathode current is the other boundary: below this the internal gain drops and the output voltage drifts off the programmed setpoint. If the board sits in an unheated enclosure or near a motor drive that pushes the ambient above 70°C, step up to the TL431BID or TL431BQ variants in the same SOIC-8 footprint. ## SOIC-8 — the footprint that fits everywhere The 0.154-inch body width and 1.27 mm pin pitch are compatible with two-layer PCB layouts — no via-in-pad or microvia needed. The tape-and-reel and cut-tape options cover both production reels and prototype quantities.","metaTitle":"TL431BCDR Shunt Regulator, Adjustable 2.495V, ±0.5%, SOIC-8","metaDescription":"TL431BCDR adjustable precision shunt regulator, 2.495V reference, ±0.5% tolerance, 100 mA output, SOIC-8 surface mount.","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":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"100 mA","Current - Supply":"-","Current - Cathode":"600 µA","Base Product Number":"TL431","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"-","Operating Temperature":"0°C~70°C(TA)","Voltage - Output (Max)":"36 V","Supplier Device Package":"8-SOIC","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1314","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e8567ad04842692d5fb8309c69e90b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TL431BCDR/alternatives.json"},"ai":{"faq":[{"question":"Is TL431BCDR equivalent to TL431A?","answer":"Functionally identical — both are adjustable shunt regulators with a 2.495 V reference. The difference is tolerance: TL431BCDR is ±0.5%, while TL431A is ±1%. The BCDR is the tighter-grade version. Pin-compatible in SOIC-8; a TL431A can replace a TL431BCDR only if the design can tolerate the wider reference tolerance."},{"question":"Can TL431BCDR be used as a shunt regulator?","answer":"Yes — that is its primary application. The TL431BCDR is a shunt regulator, meaning it sinks current from a supply through a series resistor to maintain a stable voltage at the cathode. It is the same topology as a Zener diode but with a programmable voltage and much tighter tolerance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL431BCDR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL431BCDR 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}}