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Texas Instruments TPS3840DL31DBVR
- Part No.:
- TPS3840DL31DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL31DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,685
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Product details
Overview
TPS3840DL31DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 3.1V fixed threshold (±1.5% max), 300nA typical supply current, and user-programmable reset delay via external capacitor on the CT pin. It monitors VDD in battery-powered or industrial systems where ultra-low quiescent current and precise voltage supervision are critical for safe power-up and fault detection.
For engineers reviewing the TPS3840DL31DBVR datasheet, TPS3840DL31DBVR pinout, TPS3840DL31DBVR application, or TPS3840DL31DBVR equivalent, key selection considerations include its 3.1V threshold accuracy, SOT-23-5 package footprint, open-drain output requiring external pull-up, programmable tD from 50µs to 6.2s, and operation across –40°C to +125°C.
Technical Context
The TPS3840DL31DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typical for 3.1V threshold) and glitch immunity on both VDD and MR inputs. Its internal CT pin resistor (500kΩ typical) forms an RC timing network with external capacitance to generate a monotonic, temperature-stable reset delay.
It features fast startup delay (220µs typical), low-power-on-reset (VPOR = 950mV), and operates over 1.5V–10V VDD - enabling direct monitoring of 3.3V, 5V, or 9V rails without external resistive dividers. The open-drain RESET output supports flexible voltage-level translation via external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 3.1V ±1.5% max - ensures reliable reset assertion at precisely defined supply voltage, critical for microcontroller brown-out protection |
| IDD Supply Current | 300nA typical - extends battery life in portable equipment and enables always-on supervision in energy-constrained IoT nodes |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling during slow-rising/falling VDD transitions near threshold |
| tSTRT Startup Delay | 220µs typical - guarantees stable internal biasing before reset release, avoiding premature system enable during power ramp-up |
| tD Reset Delay Range | 50µs (CT floating) to 6.2s (10µF) - allows precise tailoring of reset hold time for diverse processor boot sequences and peripheral initialization windows |
| Operating Temp | –40°C to +125°C - supports deployment in automotive under-hood, industrial PLC, and grid infrastructure environments |
| VPOR Power-On Reset | 950mV - defines minimum valid VDD level before RESET becomes controllable, preventing undefined logic states during cold start |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low output | Asserts low when VDD < 3.1V or MR is pulled low; requires external pull-up resistor for proper logic level translation and bus sharing |
| 2 - VDD | Supply input & monitored rail | Primary power source and voltage sense node; accepts 1.5V–10V directly, eliminating need for external divider in many applications |
| 3 - GND | Analog/digital ground reference | Common return path for internal comparator, bandgap, and output driver; must be low-impedance for accurate threshold tracking |
| 4 - MR | Active-low manual reset input | Logic-controlled reset initiation; internally pulled up (100kΩ); asserts RESET when driven below 600mV (VMR_L) |
| 5 - CT | Capacitor time-delay programming | Connects to external capacitor (0–10µF) to set reset hold time; floating for minimum 50µs delay; internal 500kΩ resistor sets RC time constant |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables multi-year battery life in coin-cell-powered smoke detectors and remote sensors |
| Factory-trimmed 3.1V threshold | ±1.5% max accuracy over temperature eliminates calibration overhead in production test and field deployment |
| Programmable reset delay | Wide 50µs–6.2s range via single external capacitor simplifies BOM and layout vs. fixed-delay alternatives |
| Glitch-immune VDD and MR inputs | 10µs minimum pulse rejection at 5% overdrive prevents false resets from EMI or switching noise in noisy industrial environments |
| Open-drain RESET output | Supports wired-OR configuration with other supervisors and enables level-shifting across mixed-voltage systems |
Applications
| Smart Meter Power Supervision | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V or 5V MCU supply in ANSI C12.22-compliant smart meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt firmware execution during brown-out or transient dips. Use Value: Prevents corrupted flash writes and memory corruption during grid voltage sags, ensuring meter data integrity and regulatory compliance. | Use Scenario: Embedded in DIN-rail-mounted PLC I/O modules operating in factory-floor environments with 24V DC input and isolated 5V logic rails. IC Role / Device Role / Timing Role: Supervises isolated 5V logic supply; provides configurable reset hold time to synchronize FPGA configuration and analog front-end initialization. Use Value: Enables robust cold-start behavior after power cycling and eliminates spurious resets caused by relay coil back-EMF or motor drive transients. |
| Fire Alarm Control Panel | Portable Medical Monitor |
Use Scenario: Used in UL 864-certified fire alarm panels where backup battery operation must sustain supervision for >24 hours during AC failure. IC Role / Device Role / Timing Role: Nano-power supervisor monitoring primary 12V rail and backup 3.7V Li-ion battery; triggers system-wide reset on undervoltage. Use Value: 300nA IDD minimizes standby drain, extending battery runtime while maintaining certified fault-detection response time. | Use Scenario: Integrated into handheld ECG or pulse oximeter devices powered by single-cell Li-ion batteries (3.0V–4.2V). IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts RESET if battery voltage drops below 3.1V threshold during discharge. Use Value: Ensures clean shutdown before brown-out, preserving patient data in nonvolatile memory and preventing unsafe device operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL31DBVR | Push-pull active-low RESET output; no external pull-up required; higher sink current (2mA min) | Better suited for driving heavy capacitive loads or interfacing directly with microcontroller reset pins lacking internal pull-up | Select when board space permits no external resistor and higher drive strength is needed |
| MAX6326LT31D2T | 3.08V threshold (±1.5%), 1.6µA IDD, fixed 200ms reset delay, SOT-23-5 | Lacks programmable delay and MR input; higher quiescent current limits battery lifetime in ultra-low-power designs | Consider only if fixed delay suffices and nano-power is not required |
Compared with TPS3840PL31DBVR, the TPS3840DL31DBVR trades off external component count for flexibility in voltage translation and bus sharing; compared with MAX6326LT31D2T, it delivers 5× lower supply current and full delay programmability at the cost of slightly higher design complexity.
Availability
TPS3840DL31DBVR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, fire safety systems, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3840DL31DBVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The TPS3840 family is designed for ultra-low-power voltage supervision in battery-backed and energy-sensitive systems, emphasizing nanoscale quiescent current, wide input voltage range, and field-programmable timing without external logic.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL31DBVR?
The TPS3840DL31DBVR has a factory-set negative-going input threshold (VIT−) of 3.1V with ±1.5% maximum accuracy over –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 100mV (typical), ensuring stable reset release above 3.2V. This specification is validated per TI's production test flow and documented in Section 6.5 of the SNVSB03E datasheet.
How does the CT pin function in the TPS3840DL31DBVR?
The CT pin on the TPS3840DL31DBVR sets the reset time delay (tD) via an external capacitor to ground. With no capacitor (pin floating), tD is 50µs (typical). Connecting a 10µF capacitor yields ~6.2s delay. The internal CT resistor is 500kΩ (typical), forming an RC network; Equation 4 in the datasheet (tD = 618937 × CCT_EXT + 50µs) defines the relationship.
Can the TPS3840DL31DBVR monitor a 9V battery directly?
Yes - the TPS3840DL31DBVR supports 1.5V–10V VDD operation, allowing direct connection to a 9V alkaline or lithium battery without external resistive dividers. Its 3.1V threshold remains accurate across this range, and 300nA supply current minimizes battery drain during storage or standby.
What is the purpose of the MR pin on the TPS3840DL31DBVR?
The MR (Manual Reset) pin on the TPS3840DL31DBVR provides a logic-controlled reset initiation path. Driving MR below 600mV (VMR_L) asserts RESET regardless of VDD level. When left floating, an internal 100kΩ pull-up holds MR high, disabling manual reset. This enables system-level reset coordination via microcontroller GPIO or push-button circuits.
Does the TPS3840DL31DBVR require an external pull-up resistor on the RESET pin?
Yes - the TPS3840DL31DBVR features an open-drain active-low RESET output, which requires an external pull-up resistor to VDD or another logic rail. Typical values range from 10kΩ to 100kΩ. This configuration enables wired-OR reset buses and voltage-level translation, unlike push-pull variants such as the TPS3840PL31DBVR.
TPS3840DL31DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.1V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840DL31DBVR FAQ
1.How can I place an order for TPS3840DL31DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL31DBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS3840DL31DBVR reliable?
The price and inventory of TPS3840DL31DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL31DBVR is usually 5 days.
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Once your TPS3840DL31DBVR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS3840DL31DBVR?
For technical support, including TPS3840DL31DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL31DBVR requirements.
6.How does Aetrix verify that TPS3840DL31DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL31DBVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS3840DL31DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL31DBVR?
All TPS3840DL31DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL31DBVR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS3840DL31DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL31DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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