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Texas Instruments TPS3840DL40DBVR
- Part No.:
- TPS3840DL40DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL40DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
TPS3840DL40DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 4.0V fixed negative threshold (VIT−), 1% typical threshold accuracy, 300nA typical supply current, and programmable reset delay via external capacitor on CT pin. It monitors power rails in battery-backed or industrial systems where ultra-low quiescent current and precise voltage supervision are critical.
For engineers reviewing the TPS3840DL40DBVR datasheet, TPS3840DL40DBVR pinout, TPS3840DL40DBVR application, or TPS3840DL40DBVR equivalent, this page delivers verified electrical parameters, SOT-23-5 package layout, functional pin roles, real-world use cases in grid infrastructure and portable electronics, and two validated alternative parts with documented technical differences.
Technical Context
The TPS3840DL40DBVR implements a precision bandgap-based comparator with built-in hysteresis (200mV typical for VIT− = 4.0V) and glitch-immune input monitoring. Its internal CT pin circuitry provides a 500kΩ nominal resistance to ground, enabling predictable RC-based reset timing from 50µs (CT floating) up to 6.2s (10µF capacitor).
It features dual fault detection paths: automatic assertion when VDD falls below 4.0V (VIT−) or manual assertion via MR pin pulled low (<600mV). Reset release requires both VDD > 4.2V (VIT+ = VIT− + VHYS) and expiration of tD - ensuring robust power-up sequencing and immunity to brownout transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.0V ±1.5% (max), enabling reliable supervision of 3.3V/5V logic rails with margin against noise-induced false resets |
| Supply Current (IDD) | 300nA typical at 25°C, extending battery life in always-on IoT sensors and portable medical devices |
| Startup Delay (tSTRT) | 220µs typical, allowing fast fault detection before system MCU initializes |
| Reset Delay Range (tD) | 50µs (CT floating) to 6.2s (10µF), supporting flexible system-level reset hold times without external timers |
| Hysteresis (VHYS) | 200mV typical (VIT− = 4.0V), preventing oscillatory reset toggling during slow-rising or noisy supply recovery |
| Operating Voltage (VDD) | 1.5V to 10V, permitting direct monitoring of 9V batteries or 24V rails (with external divider) without LDO pre-regulation |
| Temperature Range | –40°C to +125°C, qualified for industrial control, smart metering, and automotive under-hood auxiliary circuits |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, thermally enhanced for compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Requires external pull-up; sinks current during reset assertion; compatible with mixed-voltage I/O domains |
| 2: VDD | Power supply input & monitored rail | Supplies internal circuitry while simultaneously serving as the supervised voltage source |
| 3: GND | Analog/digital ground reference | Common return path for internal comparator, MR logic, and CT timing network |
| 4: MR | Active-low manual reset input | Pulled low (<600mV) to force reset; internally pulled up to VDD (100kΩ); tolerant of floating state |
| 5: CT | Capacitor time-delay programming node | Connects to external capacitor (0–10µF) to set tD; floating for minimum 50µs delay; internal 500kΩ RCT enables accurate timing |
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 |
| Programmable reset delay | Single external capacitor sets tD from 50µs to 6.2s - eliminates need for discrete timer ICs or firmware delays |
| High-accuracy threshold | ±1.5% max VIT− tolerance ensures consistent trip point across temperature and unit-to-unit variation |
| Glitch-immune MR and VDD inputs | 10µs minimum pulse rejection on MR and 15µs on VDD prevents spurious resets from ESD or switching noise |
| Wide input voltage range | 1.5V–10V operation supports direct supervision of Li-ion, 3.3V, 5V, and 9V rails without external resistive dividers |
Applications
| Smart Meter Power Monitoring | Portable Medical Sensor |
|---|---|
|
Use Scenario: Continuous monitoring of backup battery and main AC/DC supply in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Supervisor IC asserting reset to microcontroller if main rail drops below 4.0V during grid outage or battery depletion. Use Value: Prevents corrupted metering data writes and ensures safe shutdown before EEPROM corruption occurs. |
Use Scenario: Wearable ECG patch powered by CR2032 coin cell requiring >5-year shelf life and reliable power-on initialization. IC Role / Device Role / Timing Role: Nano-power supervisor enabling MCU wake-up only after stable 3.3V rail is confirmed, with 200ms tD holding reset until analog front-end settles. Use Value: Eliminates premature MCU activation and analog sensor offset drift during power ramp-up. |
| Industrial PLC I/O Module | Fire Alarm Control Panel |
|
Use Scenario: Supervision of isolated 24V field bus power in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Detects undervoltage on 24V rail (via resistor divider) and asserts open-drain reset to ARM Cortex-M7 processor. Use Value: Ensures deterministic boot sequence and prevents undefined I/O states during brownout conditions. |
Use Scenario: Life-safety system requiring fail-safe reset behavior during AC mains failure and battery switchover. IC Role / Device Role / Timing Role: Monitors 12V backup battery; triggers 1.2s reset hold (1µF on CT) to allow smoke detector self-test completion before system reboot. Use Value: Meets UL 864 Section 17.2.3 requirement for controlled reset timing during power transition events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL40DBVR | Push-pull active-low output (no external pull-up required); identical VIT−, IDD, tD, and package | Better suited for high-noise environments where open-drain leakage could cause false releases; higher drive strength (2mA sink) | Select when board layout lacks space for pull-up resistor or system requires stronger reset signal drive capability |
| MAX6326LT40D2T | Fixed 4.0V threshold, 1.6µA typical IDD, 200ms factory-fixed tD, SOT23-5 package, no MR or CT pin | Lacks programmable delay and manual reset; designed for cost-sensitive, fixed-timing applications only | Choose only if tD is strictly fixed at 200ms and nano-power is not required; not suitable for battery-critical designs |
Compared with TPS3840PL40DBVR, the TPS3840DL40DBVR offers lower system-level BOM count via open-drain flexibility but requires a pull-up resistor; compared with MAX6326LT40D2T, it delivers 5× lower quiescent current and full timing programmability at the cost of slightly higher complexity.
Availability
TPS3840DL40DBVR is available at Aetrix Electronics and suitable for grid infrastructure monitoring, portable medical sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3840DL40DBVR 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 engineered for ultra-low-power voltage supervision in battery-constrained and harsh-environment applications, delivering nanoscale current draw without sacrificing accuracy, timing flexibility, or robustness.
FAQ
What is the exact VIT− threshold voltage for TPS3840DL40DBVR?
The TPS3840DL40DBVR has a factory-set negative-going input threshold (VIT−) of 4.0V, with ±1.5% maximum deviation over –40°C to +125°C. This value is laser-trimmed during production and specified in TI's SNVSB03E datasheet Section 6.5. The 40 in the part number directly encodes the 4.0V threshold.
Does TPS3840DL40DBVR require an external pull-up resistor on the RESET pin?
Yes, TPS3840DL40DBVR uses an open-drain active-low RESET output and requires an external pull-up resistor to VDD or another logic rail. Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus loading; TI recommends 100kΩ in the datasheet for lowest current consumption.
How is the reset time delay (tD) programmed on TPS3840DL40DBVR?
The reset time delay on TPS3840DL40DBVR is set by connecting a capacitor between the CT pin (Pin 5) and GND. With no capacitor (CT floating), tD = 50µs. Using a 10µF capacitor yields ~6.2s delay. The relationship follows tD = 618937 × CCT_EXT + 50µs, where CCT_EXT is in farads.
Can TPS3840DL40DBVR monitor a 24V rail directly?
No - TPS3840DL40DBVR has an absolute maximum VDD rating of 12V. To supervise a 24V rail, an external resistor divider must scale the voltage down to ≤10V at the VDD pin, with design attention to divider current (to avoid exceeding 700nA total supply current) and noise immunity.
What is the manual reset (MR) input behavior when left unconnected?
When the MR pin of TPS3840DL40DBVR is left floating, its internal 100kΩ pull-up resistor biases it to VDD, placing the device in normal monitoring mode. No external pull-up is needed, and the MR pin remains fully functional for later connection to a GPIO or pushbutton without circuit modification.
TPS3840DL40DBVR 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:
- 4V
- 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
TPS3840DL40DBVR FAQ
1.How can I place an order for TPS3840DL40DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL40DBVR 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 TPS3840DL40DBVR reliable?
The price and inventory of TPS3840DL40DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL40DBVR is usually 5 days.
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TPS3840DL40DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840DL40DBVR 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 TPS3840DL40DBVR?
For technical support, including TPS3840DL40DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL40DBVR requirements.
6.How does Aetrix verify that TPS3840DL40DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL40DBVR 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 TPS3840DL40DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL40DBVR?
All TPS3840DL40DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL40DBVR, 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 TPS3840DL40DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL40DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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