{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TL431IPK","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TL431IPK","canonicalUrl":"https://icboms.com/texas-instruments/TL431IPK","factsUrl":"https://icboms.com/api/mcp/products/TL431IPK","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TL431IPK, adjustable shunt voltage reference, 2.495 V min / 36 V max output, 100 mA cathode current, ±2.2% tolerance, SOT-89-3 (TO-243AA) surface mount, -40°C to 85°C.","salesMarkdown":"No last-time-buy window to chase, no forced redesign for a drop-in substitute. ## Output range: 2.495 V to 36 V — covers most bias rails This is a shunt reference, not a series regulator. The output voltage is set by two external resistors and can be programmed anywhere from the internal 2.495 V reference up to 36 V. The 100 mA cathode current rating means it can sink enough current to drive an optocoupler LED in a feedback loop or power a small auxiliary load. ## ±2.2% tolerance — tighter than the garden-variety TL431 The standard TL431B is 0.5%, the TL431A is 1%, and the base TL431 is 2%. At ±2.2%, this part sits between the base and the A-grade. For a non-critical bias supply or a secondary feedback path, it is fine — but if you need better than 2% initial accuracy, step up to the TL431A or TL431B. ## SOT-89-3 package — small, but watch the tab The SOT-89-3 (TO-243AA) is a three-lead surface-mount package with a large collector tab on the back. Not rated for under-hood automotive or extended-temperature (125°C) environments — if the board sits near an engine or a hot power stage, look at the TL431Q or TL431M variants.","metaTitle":"TL431IPK adjustable shunt reference, 2.495 V to 36 V, ±2.2%","metaDescription":"TL431IPK adjustable shunt voltage reference, 100 mA output, ±2.2% tolerance, SOT-89-3.","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); Cut Tape (CT)","Tolerance":"±2.2%","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-243AA","Product Status":"Active","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~85°C(TA)","Voltage - Output (Max)":"36 V","Supplier Device Package":"SOT-89-3","Temperature Coefficient":"-","Voltage - Output (Min/Fixed)":"2.495V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/2e8567ad04842692d5fb8309c69e90b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TL431IPK/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to TL431IPK?","answer":"Any TL431 in the same SOT-89-3 package is pin-compatible. The TL431AIPK (1% tolerance) and TL431BIPK (0.5% tolerance) are drop-in replacements with tighter accuracy. The base TL431IPK is the ±2.2% variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TL431IPK","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TL431IPK 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}}