{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TPS3840DL42DBVR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TPS3840DL42DBVR","canonicalUrl":"https://icboms.com/texas-instruments/TPS3840DL42DBVR","factsUrl":"https://icboms.com/api/mcp/products/TPS3840DL42DBVR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TPS3840DL42DBVR simple reset/power-on reset IC, active-low open-drain output, 4.2V threshold, 619ms typical timeout, SOT-23-5 package, -40°C to 125°C.","salesMarkdown":"## 4.2 V threshold — matching the monitored rail The 4.2 V threshold is designed for 5 V nominal rails, typically found in industrial control boards, PLC I/O modules, and sensor interfaces where a clean power-up sequence is required. ## Active-low open-drain output — daisy-chain and level-shift ready The reset output is active-low open-drain, which means it can be wire-ORed with other reset supervisors and pulled up to any voltage within the absolute maximum rating of the open-drain transistor. This is the standard interface for multi-rail systems where a single reset signal must be shared across a 3.3 V MCU and a 5 V peripheral — the pull-up resistor sets the logic level independently of the IC's supply. The open-drain output also allows the reset line to be driven low by an external push-button or test header without contention. ## 619 ms timeout — power-up sequencing window The 619 ms typical reset timeout is long enough to cover the start-up settling time of most switching regulators and crystal oscillators used with 32-bit MCUs in the 48–120 MHz range. For systems that need a shorter or longer delay, the timeout is fixed internally — no external capacitor needed. The SOT-23-5 package (SC-74A, SOT-753) is a standard footprint that fits into compact designs without requiring a dedicated thermal pad — the junction-to-ambient thermal resistance is low enough for the sub-mA quiescent current of this reset IC. This is a standard-voltage supervisor in a common package, so the supply chain risk is low.","metaTitle":"TI TPS3840DL42DBVR Simple Reset/Power-On Reset","metaDescription":"Texas Instruments TPS3840DL42DBVR simple reset/power-on reset IC with 4.2V threshold, active-low open-drain output, 619ms timeout.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Type":"Simple Reset/Power-On Reset","Reset":"Active Low","Output":"Open Drain or Open Collector","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Reset Timeout":"619ms Typical","Package / Case":"SC-74A, SOT-753","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"TPS3840","Voltage - Threshold":"4.2V","Operating Temperature":"-40°C~125°C(TJ)","Supplier Device Package":"SOT-23-5","Number of Voltages Monitored":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5c43cdc78d6ce4876119969a2f71b26e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TPS3840DL42DBVR/alternatives.json"},"ai":{"faq":[{"question":"Is TPS3840DL42DBVR active low or active high?","answer":"The reset output is active low — the output goes low when the supply drops below the threshold and stays low for the timeout period after recovery."},{"question":"What is the reset timeout period of TPS3840DL42DBVR?","answer":"The reset timeout is 619 ms typical, measured from the moment the supply rises above the threshold until the reset output is released."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TPS3840DL42DBVR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TPS3840DL42DBVR 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}}