{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL431QDBZRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL431QDBZRG4","canonicalUrl":"https://icboms.com/texas-instruments/TL431QDBZRG4","factsUrl":"https://icboms.com/api/mcp/products/TL431QDBZRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL431QDBZRG4, adjustable shunt voltage reference, 2.495 V min output, 36 V max, 100 mA cathode current, ±2.2% tolerance, -40°C to 125°C, SOT-23-3 package, Tape & Reel.","salesMarkdown":"## SOT-23-3 shunt reference — the BOM workhorse It provides a 2.495 V reference threshold and can be programmed via two external resistors to any output voltage between that minimum and 36 V. ## 100 mA cathode current and the feedback loop budget The 100 mA output current rating defines the maximum sink current through the cathode. In an SMPS feedback application, this sets the bias current available for the optocoupler LED and any pull-up resistor — typically 1 mA to 10 mA is sufficient, leaving headroom for transient loads. Designs must ensure the cathode current never drops below this threshold at the minimum input voltage, or the reference output will drift out of regulation. ## ±2.2% tolerance — precision without the premium The ±2.2% tolerance on the reference voltage sits between the standard ±2.5% and the tighter ±1% or ±0.5% grades. For an 8-bit ADC reference or a 12 V rail feedback divider, this is adequate precision at a lower cost than a 0.5% part. If the design needs better than 2% initial accuracy, step up to the TL431A (1%) or TL431B (0.5%) variants. This makes it suitable for outdoor telecom cabinets, motor drive enclosures, under-hood automotive electronics, and any environment where the PCB sees wide thermal cycling.","metaTitle":"TL431QDBZRG4 Shunt Regulator, 2.495 V Ref, SOT-23-3","metaDescription":"Texas Instruments TL431QDBZRG4 adjustable shunt voltage reference. 2.495 V min output, 36 V max, 100 mA cathode current, ±2.2% tolerance, -40°C to 125°C.","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)","Tolerance":"±2.2%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Reference Type":"Shunt","Voltage - Input":"-","lifecycle_stage":"eol_hot","Current - Output":"100 mA","Current - Supply":"-","Current - Cathode":"1 mA","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-23-3","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e8567ad04842692d5fb8309c69e90b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TL431QDBZRG4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to TL431QDBZRG4?","answer":"The TL431 family shares the same pinout across SOT-23-3 variants. For tighter tolerance, the TL431AIDBZR offers ±1% initial accuracy in the same footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL431QDBZRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL431QDBZRG4 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}}