{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ATL431LIAIDQNR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ATL431LIAIDQNR","canonicalUrl":"https://icboms.com/texas-instruments/ATL431LIAIDQNR","factsUrl":"https://icboms.com/api/mcp/products/ATL431LIAIDQNR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ATL431LIAIDQNR, adjustable shunt voltage reference, 2.5V to 36V output, ±1% tolerance, 80 µA cathode current, 15 mA output, -40°C to 85°C, 4-X2SON (1x1mm) package, Tape & Reel.","salesMarkdown":"It delivers an adjustable output from 2.5 V up to 36 V with ±1% tolerance, drawing only 80 µA minimum cathode current to regulate. That low bias current is the headline difference from the classic TL431 family: you can run it from a high-value dropping resistor without wasting milliamps in the reference leg, which matters in standby supplies, auxiliary windings, and any circuit where every microamp counts toward the no-load power budget. ## Output voltage range and what it covers The 2.5 V floor is the bandgap reference voltage; the 36 V ceiling is set by the internal transistor breakdown. This range covers the vast majority of secondary-side regulation loops in offline flyback converters (3.3 V, 5 V, 12 V rails), bias supplies for PFC stages, and industrial control rails up to 24 V. If your design needs a reference below 2.5 V, this part won't work — you'd need a series reference like the LM4132 family instead. ## 80 µA cathode current — the low-power edge The 80 µA minimum cathode current is the spec that separates this part from a standard TL431 (which typically needs 1 mA minimum to regulate). In a shunt regulator, the cathode current is the current that flows through the reference itself — wasted from the load's perspective. Dropping from 1 mA to 80 µA cuts that overhead by more than 90%, which directly improves light-load efficiency in a flyback converter's standby mode or extends battery life in a portable instrument's bias rail. The trade-off is that the ATL431LIAIDQNR's transconductance is lower, so the loop compensation may need a slightly different pole-zero placement than a TL431 design — check the phase margin if you're swapping directly. ## Package and footprint — 1x1 mm X2SON The 4-X2SON package measures 1x1 mm, which is roughly one-quarter the board area of a SOT-23-3. That tiny footprint comes with a practical cost: the exposed pad is the cathode connection, and the solder joints are small enough that a standard reflow profile needs careful stencil design to avoid opens. It suits outdoor telecom cabinets, factory-floor sensors, automotive cabin electronics, and consumer power adapters that see moderate thermal cycling. If your design needs 125°C operation, look at the ATL431LI-Q1 automotive-grade variant or a series reference with a wider temperature range. No LTB planning is needed for the foreseeable future, but the X2SON package is a relatively new format — if your production runs past 2028, keep an eye on TI's PCN feed for any package-migration notices.","metaTitle":"ATL431LIAIDQNR Shunt Voltage Reference, 2.5V-36V, ±1%","metaDescription":"ATL431LIAIDQNR adjustable shunt voltage reference from TI. 2.5V to 36V output, ±1% tolerance, 80 µA cathode current. 4-X2SON (1x1mm) package. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±1%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"4-XDFN Exposed Pad","Product Status":"Active","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"15 mA","Current - Supply":"-","Current - Cathode":"80 µA","Base Product Number":"ATL431","Noise - 0.1Hz to 10Hz":"-","Noise - 10Hz to 10kHz":"-","Operating Temperature":"-40°C~85°C(TA)","Voltage - Output (Max)":"36 V","Supplier Device Package":"4-X2SON (1x1)","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6200","priceTiers":[{"qty":1,"price":"$0.62000","currency":"USD"},{"qty":10,"price":"$0.52900","currency":"USD"},{"qty":25,"price":"$0.49360","currency":"USD"},{"qty":100,"price":"$0.39470","currency":"USD"},{"qty":250,"price":"$0.36656","currency":"USD"},{"qty":500,"price":"$0.31016","currency":"USD"},{"qty":1000,"price":"$0.23967","currency":"USD"},{"qty":3000,"price":"$0.15280","currency":"USD"},{"qty":6000,"price":"$0.14294","currency":"USD"},{"qty":15000,"price":"$0.13950","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/01036f6b90e1bdae2ec431511e354e53.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ATL431LIAIDQNR/alternatives.json"},"ai":{"faq":[{"question":"Is ATL431LIAIDQNR a drop-in replacement for TL431?","answer":"Functionally yes — it is the same adjustable shunt reference topology with the same 2.5 V reference and resistor-divider feedback. However, the 80 µA minimum cathode current is much lower than a standard TL431's 1 mA, and the 1x1 mm X2SON package is a different footprint than the SOT-23 or TO-92 of a TL431. The loop compensation may need adjustment due to the lower transconductance. It is not a pin-compatible drop-in on the same PCB land pattern."},{"question":"Is ATL431LIAIDQNR RoHS compliant and lead-free?","answer":"Yes, it is ROHS3 compliant per the listing."},{"question":"What is the cathode current of ATL431LIAIDQNR?","answer":"The minimum cathode current is 80 µA, which is the current the device draws to maintain regulation. The maximum output current is 15 mA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ATL431LIAIDQNR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ATL431LIAIDQNR 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}}