{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TPS3840DL37DBVRQ1","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TPS3840DL37DBVRQ1","canonicalUrl":"https://icboms.com/texas-instruments/TPS3840DL37DBVRQ1","factsUrl":"https://icboms.com/api/mcp/products/TPS3840DL37DBVRQ1","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TPS3840DL37DBVRQ1, Automotive AEC-Q100 Simple Reset/Power-On Reset, 3.7V threshold, active-low open-drain output, 619 ms typical reset timeout, -40°C to 125°C, SOT-23-5","salesMarkdown":"## What the 3.7V threshold means for your 3.3V rail The TPS3840DL37DBVRQ1 monitors a single voltage rail and asserts a reset when the supply drops below 3.7V. For a 3.3V nominal rail, that threshold sits at roughly 12% above the target — the supervisor triggers before the rail collapses below the minimum operating voltage of most 3.3V logic, giving the system a clean reset edge. The active-low open-drain output pulls the reset line low on a fault and releases it after the 619 ms typical reset timeout once the rail recovers. That 619 ms window is long enough to let a downstream regulator or oscillator stabilize before the processor starts executing. The part is a Simple Reset/Power-On Reset type — no adjustable delay, no manual reset input. It is a fixed-threshold, fixed-timeout supervisor for applications where the reset timing is defined by the rail behavior, not by a host controller. ## Automotive grade and temperature range — where it survives That covers under-hood electronics, engine-bay sensors, and industrial enclosures. ## Package and footprint — SOT-23-5 fit check The part is supplied in a SOT-753 package, also listed as SOT-23-5 supplier device package. The 5-pin SOT-23 footprint is a de facto standard for voltage supervisors — the same land pattern handles the TLV803 and many other reset ICs, so a board respin is unlikely if swapping between these families. Available in Tape & Reel and Cut Tape options for both production reels and prototype quantities. Sourcing through authorized distribution is straightforward — no date-code lottery or broker-mystery stock required. ROHS3 compliant, which matches the current EU exemption rules. No transition risk from an older ROHS version. ## How it compares to the TLV803 family The closest functional second-source candidate is the TLV803EA29VDBZR — also an active-low, open-drain simple reset IC in a similar SOT-23 package. The key difference is the threshold: the TLV803EA29VDBZR trips at 2.93V, not 3.7V. If your rail is 3.3V, the TPS3840DL37DBVRQ1 gives a higher guard band. The TLV803EA29VDBZR has a 130 ms minimum reset timeout versus the 619 ms typical on the TPS3840 — so the TPS3840 holds the processor in reset longer after a brown-out. The TLV803ED29DBZR is another sibling with a 33 ms minimum reset timeout — even shorter. For systems that need a fast restart after a glitch, that might be the better fit, but the TPS3840DL37DBVRQ1's 619 ms timeout is more forgiving for power supplies with slow ramp-up.","metaTitle":"TPS3840DL37DBVRQ1 — TI Automotive Simple Reset/Power-On","metaDescription":"Texas Instruments TPS3840DL37DBVRQ1 — AEC-Q100 qualified simple reset IC, 3.7V threshold, active-low open-drain output, 619 ms reset timeout, -40°C to 125°C","metaKeywords":null},"attributes":{"series":"Automotive, AEC-Q100","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","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":"Automotive, AEC-Q100","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":"3.7V","Operating Temperature":"-40°C~125°C(TJ)","Supplier Device Package":"SOT-23-5","Number of Voltages Monitored":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4300","priceTiers":[{"qty":1,"price":"$1.43000","currency":"USD"},{"qty":10,"price":"$1.27900","currency":"USD"},{"qty":25,"price":"$1.21400","currency":"USD"},{"qty":100,"price":"$0.99710","currency":"USD"},{"qty":250,"price":"$0.93212","currency":"USD"},{"qty":500,"price":"$0.82372","currency":"USD"},{"qty":1000,"price":"$0.65031","currency":"USD"},{"qty":3000,"price":"$0.46050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/38b6907610defeba97afc045ec167792.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TPS3840DL37DBVRQ1/alternatives.json"},"ai":{"faq":[{"question":"What is the reset timeout of TPS3840DL37DBVRQ1?","answer":"The reset timeout is 619 ms typical. That is the delay from when the monitored rail rises above the 3.7V threshold to when the reset output releases. It is a fixed timeout — no external capacitor or resistor sets it."},{"question":"Is TPS3840DL37DBVRQ1 automotive qualified?","answer":"Yes, it is AEC-Q100 qualified and part of the Automotive series. That means it has passed the automotive stress tests required for PPAP submission and use in safety-related systems."},{"question":"When sourcing TPS3840DL37DBVRQ1, what is the closest functional second-source — TLV803EA29VDBZR?","answer":"The TLV803EA29VDBZR is a functional peer — same active-low open-drain output, same SOT-23 package. The TLV803 also has a shorter reset timeout (130 ms minimum vs 619 ms typical). It is a cross-shop candidate, not a pin-for-pin drop-in — confirm the threshold and timing match your system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TPS3840DL37DBVRQ1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TPS3840DL37DBVRQ1 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}}