{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM431CIZ/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM431CIZ-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM431CIZ-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM431CIZ%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM431CIZ/NOPB adjustable shunt voltage reference, TO-92-3 through-hole package, 2.5 V to 37 V output, 100 mA output current, ±0.6% tolerance, 50 ppm/°C tempco, -40°C to 85°C.","salesMarkdown":"## Adjustable shunt reference in TO-92 The Texas Instruments LM431CIZ/NOPB is a three-terminal adjustable shunt voltage reference in a through-hole TO-92-3 package. It is the classic 431 topology — a precision reference that sets its output voltage with two external resistors, covering 2.5 V to 37 V. This makes it suitable for power-supply feedback loops, adjustable regulators, and A/D converter references where the drift budget is tight. ## 100 mA sink current and 1 mA minimum cathode current The device sinks up to 100 mA continuous output current — enough to drive the optocoupler LED in a flyback supply or to bias a string of comparators. The minimum cathode current for regulation is 1 mA, which sets the lower bound on the bias resistor from the supply rail. Because it is a shunt reference, the LM431CIZ/NOPB regulates by sinking current from the cathode to the anode. This topology works equally well for positive-rail references and for floating or negative-rail applications where a series reference would not fit. For a BOM that needs a surface-mount alternative, the TL431IDBVR is a functional peer — same adjustable shunt topology and 100 mA output, but in an SOT-23 package with a wider ±2.2% tolerance band. The LM431CIZ/NOPB holds tighter accuracy and the through-hole footprint that legacy and prototyping boards require.","metaTitle":"Texas Instruments LM431CIZ/NOPB Shunt Reference, TO-92","metaDescription":"LM431CIZ/NOPB adjustable shunt voltage reference, 2.5-37 V, 100 mA, TO-92-3, -40°C to 85°C, ±0.6% tolerance. Active, RoHS3. Order today.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Tolerance":"-0.6%, +0.4%","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-226-3, TO-92-3 (TO-226AA)","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":"TO-92-3","Temperature Coefficient":"50ppm/°C Typical","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.22","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.22000","currency":"USD"},{"qty":10,"price":"$1.09400","currency":"USD"},{"qty":25,"price":"$1.03880","currency":"USD"},{"qty":100,"price":"$0.85330","currency":"USD"},{"qty":250,"price":"$0.79764","currency":"USD"},{"qty":500,"price":"$0.70490","currency":"USD"},{"qty":1000,"price":"$0.55650","currency":"USD"},{"qty":2500,"price":"$0.52500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4ef3a660563a4b71824729e57d54e8c7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to LM431CIZ/NOPB?","answer":"The TL431IDBVR is the closest functional peer — same adjustable shunt reference topology and 100 mA output current, but in a surface-mount SOT-23 package with a wider ±2.2% tolerance. The LM431CIZ/NOPB offers tighter ±0.6%/+0.4% tolerance and a through-hole TO-92-3 package."},{"question":"What is the listed tolerance of LM431CIZ/NOPB?","answer":"The output voltage tolerance is -0.6%/+0.4% at 25°C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM431CIZ-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM431CIZ-NOPB 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}}