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Texas Instruments TPS3840DL22DBVR
- Part No.:
- TPS3840DL22DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL22DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,052
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Product details
Overview
TPS3840DL22DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 2.2V fixed threshold voltage (±1.5% accuracy), 300nA typical supply current, and programmable reset delay (50µs–6.2s via external capacitor). It monitors VDD rails up to 10V in battery-powered or industrial systems requiring reliable power-on-reset and fault detection before system startup.
For engineers reviewing the TPS3840DL22DBVR datasheet, TPS3840DL22DBVR pinout, TPS3840DL22DBVR application, or TPS3840DL22DBVR equivalent, key selection considerations include its 2.2V threshold accuracy, SOT-23-5 package footprint, open-drain output topology requiring pull-up, MR-initiated reset capability, and ultra-low quiescent current enabling multi-year operation on coin cells.
Technical Context
The TPS3840DL22DBVR implements a precision bandgap-based comparator with built-in hysteresis (100mV typical for 2.2V threshold) and glitch-immune input monitoring. Its internal CT pin circuitry provides a 500kΩ nominal resistance to ground, enabling predictable RC-based reset timing across temperature (–40°C to +125°C).
Reset assertion occurs when VDD falls below 2.2V or MR is pulled low; deassertion requires VDD > 2.3V (2.2V + hysteresis) plus expiration of the programmed tD delay. The open-drain RESET output supports flexible voltage translation and wired-OR configurations with external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10V - enables direct monitoring of 3.3V, 5V, and 9V rails without external resistive dividers. |
| Threshold Voltage (VIT−) | 2.2V ±1.5% - factory-trimmed fixed threshold ensures consistent brownout detection across production lots. |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on IoT sensors and portable medical devices. |
| Startup Delay (tSTRT) | 220µs typical - detects supply faults before downstream logic powers up, enhancing system safety. |
| Reset Delay Range (tD) | 50µs (CT floating) to 6.2s (10µF) - user-programmable via single external capacitor for application-specific hold times. |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling during slow-rising or noisy supply transitions. |
| Manual Reset Input (MR) | Logic-low active, 600mV max VMR_L - compatible with 1.8V/3.3V GPIOs without level-shifting. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, thermally enhanced for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Drives low during reset; requires external pull-up resistor to define high-state voltage and sink current capability. |
| 2: VDD | Supply and monitored input | Single-pin dual function: powers internal circuitry and serves as the voltage rail under supervision. |
| 3: GND | Ground reference | Common return path for internal comparator, MR input, and CT timing network. |
| 4: MR | Active-low manual reset input | Pulled low by host MCU or switch to force immediate reset; internally pulled up to VDD (100kΩ). |
| 5: CT | Capacitor time-delay programming | Connects to external capacitor to set reset timeout; floating for minimum 50µs delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA supply current enables >10-year battery life in coin-cell–powered smoke detectors and remote sensors. |
| Fixed 2.2V threshold with 1% typical accuracy | Eliminates external resistor divider errors and drift, ensuring stable brownout point across temperature and aging. |
| Programmable reset delay via single capacitor | Supports precise hold-time tuning from microseconds to seconds using standard ceramic capacitors-no firmware or external logic required. |
| Glitch-immune VDD and MR inputs | Rejects transients <10µs at 5% overdrive, preventing false resets in electrically noisy factory automation environments. |
| Wide –40°C to +125°C operating range | Validated for use in automotive under-hood modules, grid infrastructure meters, and industrial PLC I/O cards. |
Applications
| Smart Meter Power Supervision | Portable Medical Sensor |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply in ANSI C12.22-compliant smart meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Supervisor asserts open-drain RESET to halt metering firmware during brownout, then holds reset for 200ms after recovery to ensure clean MCU boot. Use Value: Prevents corrupted flash writes and data loss during grid voltage sags, meeting IEC 62056-21 reliability requirements. |
Use Scenario: Powers continuous glucose monitor (CGM) with CR2032 coin cell and ultra-low-power BLE SoC. IC Role / Device Role / Timing Role: Detects battery voltage drop below 2.2V and triggers graceful shutdown sequence before sensor calibration fails. Use Value: 300nA quiescent current extends usable battery life to 18 months while maintaining sub-1.5% threshold accuracy over temperature. |
| Industrial PLC Digital Input Module | Fire Alarm Control Panel |
Use Scenario: Supervises isolated 24V DC-to-5V buck converter powering FPGA-based I/O logic in hazardous-area PLCs. IC Role / Device Role / Timing Role: Uses MR pin to synchronize reset across multiple modules during hot-swap insertion; CT pin sets 1.2s delay for sequenced power-up. Use Value: Ensures deterministic state initialization across distributed control nodes, eliminating race conditions during field maintenance. |
Use Scenario: Embedded in addressable fire alarm node with smoke detector, sounder, and RS-485 transceiver. IC Role / Device Role / Timing Role: Monitors backup battery (3.6V LiSOCl₂) and asserts RESET if voltage drops below 2.2V, disabling non-critical loads to preserve alarm signaling. Use Value: Meets UL 864 Class A fault tolerance by guaranteeing reset assertion within 220µs of brownout onset, even at –40°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL22DBVR | Push-pull active-low RESET output; no external pull-up required; higher VOL (200mV @ 2mA) vs. open-drain leakage-limited high state. | Better suited for driving heavy capacitive loads or interfacing directly with 1.8V logic without pull-up resistor. | Select when board space is constrained and pull-up routing is impractical; verify VOL compatibility with downstream input thresholds. |
| MAX6326LT22D3+T | Fixed 2.2V threshold, 1.6µA typical supply current, SOT-23-5, no MR pin, 200ms fixed reset delay. | Lacks programmable delay and manual reset; simpler BOM but less flexible for custom timing or debug-triggered resets. | Choose for cost-sensitive, low-complexity designs where fixed 200ms delay suffices and MR functionality is unnecessary. |
Compared with TPS3840PL22DBVR, the TPS3840DL22DBVR offers lower system-level power (no pull-up current) and voltage-translation flexibility, while MAX6326LT22D3+T trades programmability and MR for lower unit cost and guaranteed factory-set timing-making each optimal for distinct design priorities.
Availability
TPS3840DL22DBVR is available at Aetrix Electronics and suitable for smart metering, portable medical devices, industrial PLC modules, and fire safety systems requiring stable component supply with long-term lifecycle assurance.
Supply support for TPS3840DL22DBVR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.
The TPS3840 family was designed specifically for ultra-low-power, wide-input-voltage supervision in battery-backed and harsh-environment applications-emphasizing nanoscale quiescent current, factory-trimmed accuracy, and robust ESD/glitch immunity.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL22DBVR?
The TPS3840DL22DBVR has a factory-set negative-going input threshold (VIT−) of 2.2V with ±1.5% maximum accuracy over –40°C to +125°C and 1% typical accuracy at 25°C. This value is laser-trimmed during production and does not require external calibration. Hysteresis is 100mV typical, yielding a VIT+ of 2.3V for reliable release behavior.
How do I configure the reset delay time for the TPS3840DL22DBVR?
Reset delay (tD) is configured by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, tD = 50µs minimum. Using Equation tD = 618937 × CCT_EXT + 50µs, a 100nF capacitor yields ~62ms delay; a 10µF capacitor yields ~6.2s. Ensure capacitor tolerance and temperature coefficient align with timing budget-X7R ceramics are recommended.
Does the TPS3840DL22DBVR require an external pull-up resistor on the RESET pin?
Yes-the TPS3840DL22DBVR features an open-drain active-low RESET output (Pin 1), which must be pulled up to a valid logic-high voltage (e.g., VDD or another rail) via an external resistor. Typical values range from 10kΩ to 100kΩ depending on rise time and bus capacitance. No pull-up is needed for push-pull variants like TPS3840PL22DBVR.
Can the TPS3840DL22DBVR monitor a 9V battery directly?
Yes-the TPS3840DL22DBVR supports input voltages from 1.5V to 10V, allowing direct connection to 9V alkaline or lithium batteries without external resistive dividers. Its 2.2V threshold remains accurate across this full range, and 300nA supply current minimizes battery drain during storage or standby.
What is the purpose of the MR pin on the TPS3840DL22DBVR?
The MR (Manual Reset) pin (Pin 4) is an active-low input that forces RESET assertion regardless of VDD level when pulled below 600mV. It enables host MCU or external switch to initiate system reset for debugging, firmware updates, or fault recovery. When left floating, an internal 100kΩ pull-up holds MR high, disabling manual reset.
TPS3840DL22DBVR 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.2V
- 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
TPS3840DL22DBVR FAQ
1.How can I place an order for TPS3840DL22DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL22DBVR 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 TPS3840DL22DBVR reliable?
The price and inventory of TPS3840DL22DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL22DBVR is usually 5 days.
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Once your TPS3840DL22DBVR 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 TPS3840DL22DBVR?
For technical support, including TPS3840DL22DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL22DBVR requirements.
6.How does Aetrix verify that TPS3840DL22DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL22DBVR 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 TPS3840DL22DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL22DBVR?
All TPS3840DL22DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL22DBVR, 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 TPS3840DL22DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL22DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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