{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL431BCDBZRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL431BCDBZRG4","canonicalUrl":"https://icboms.com/texas-instruments/TL431BCDBZRG4","factsUrl":"https://icboms.com/api/mcp/products/TL431BCDBZRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL431BCDBZRG4, adjustable shunt voltage reference, 2.495V min output, 36V max, ±0.5% tolerance, 100 mA output, 600 µA cathode current, SOT-23-3 package, 0°C to 70°C.","salesMarkdown":"## ±0.5% tolerance — the accuracy tier that decides the BOM line That tolerance is the selection differentiator: it holds the reference voltage at 2.495 V to within ±0.5%, which is tight enough for most closed-loop power-supply feedback paths without an external trim pot. The standard TL431B grade is ±0.5% at 25°C; the non-B grade is ±2% or ±1%, so this part is the accuracy tier for designs that need regulation better than 1% but do not require the premium 0.4% or 0.2% grades. ## 2.495 V to 36 V — adjustable output envelope The reference sets a minimum output of 2.495 V (the internal bandgap) and can be programmed up to 36 V with two external resistors. This covers the common secondary-side regulation voltages in AC-DC converters (3.3 V, 5 V, 12 V, 24 V) and isolated DC-DC feedback loops. The 100 mA output current and 600 µA minimum cathode current define the load-driving and bias-current budget: the cathode must sink at least 600 µA to keep the reference in regulation, and the output can source up to 100 mA into the optocoupler LED or error-amplifier network. ## SOT-23-3 — compact footprint for dense boards The SOT-23-3 (also listed as TO-236-3 / SC-59) is a three-lead surface-mount package, 2.9 mm × 1.3 mm typical body size.","metaTitle":"TL431BCDBZRG4 Shunt Voltage Reference, ±0.5% Tolerance","metaDescription":"Texas Instruments TL431BCDBZRG4 adjustable shunt voltage reference, 2.495V to 36V output, ±0.5% tolerance, 100 mA output, SOT-23-3.","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":"±0.5%","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":"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":"SOT-23-3","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2160","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e8567ad04842692d5fb8309c69e90b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TL431BCDBZRG4/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between TL431BCDBZRG4 and the standard TL431?","answer":"The primary difference is the reference voltage tolerance. TL431BCDBZRG4 is the ±0.5% grade (B-grade), while the standard TL431 is typically ±2% or ±1% depending on the suffix. The B-grade holds tighter regulation across temperature and is the preferred choice when the feedback loop accuracy must stay within 1% without external trimming."},{"question":"Does TL431BCDBZRG4 have a pin-compatible equivalent that is easier to source?","answer":"The TL431 family is second-sourced by multiple manufacturers (ON Semiconductor, STMicroelectronics, Microchip) with the same SOT-23-3 pinout and function. Any ±0.5% B-grade TL431 in SOT-23-3 from a qualified supplier is a direct drop-in replacement. Qualify the alternate now to avoid single-source exposure on the BOM line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL431BCDBZRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL431BCDBZRG4 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}}