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Texas Instruments TPS3840PL20DBVR
- Part No.:
- TPS3840PL20DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL20DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
TPS3840PL20DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 2.0V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay (50µs to 6.2s via CT pin capacitor). It monitors VDD rails up to 10V in battery-powered or industrial power-rail supervision applications.
For engineers reviewing the TPS3840PL20DBVR datasheet, TPS3840PL20DBVR pinout, TPS3840PL20DBVR application, or TPS3840PL20DBVR equivalent, key selection criteria include its 2.0V threshold accuracy, ultra-low quiescent current across –40°C to +125°C, SOT-23-5 package footprint, MR input compatibility with microcontroller GPIOs, and glitch-immune VDD monitoring for safety-critical start-up sequences.
Technical Context
The TPS3840PL20DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typical for 2.0V threshold) and internal 500kΩ CT pin resistor enabling RC-based reset timing. Its push-pull output drives RESET low without external pull-up, supporting sink currents up to 2mA at VDD ≥ 1.5V.
It features dual fault detection: voltage drop below VIT− (2.0V) and manual reset assertion via MR pin (logic-low threshold 600mV max). Reset release requires both VDD > VIT+ (2.1V) and expiration of tD - ensuring robust power-up sequencing in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.0V ±1.5% (max) - ensures precise brown-out detection for 2.0V logic or analog subsystems |
| IDD Supply Current | 300nA (typ), 700nA (max) - extends battery life in multi-year portable deployments |
| tSTRT Startup Delay | 220µs (typ), 350µs (max) - enables reliable reset assertion before system MCU initializes |
| tD Reset Delay Range | 50µs (CT floating) to 6.2s (10µF on CT) - supports flexible hold-off timing for FPGA configuration or EEPROM write cycles |
| VHYS Hysteresis | 100mV (typ) - prevents chatter during slow-rising/falling VDD transitions near 2.0V |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
| VMR_L | 600mV (max) - compatible with 1.8V/3.3V GPIOs without level-shifting |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, 0.95mm max height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low (≤200mV @ 2mA) when VDD < 2.0V or MR asserted; no external pull-up required |
| 2: VDD | Supply and monitored rail input | Accepts 1.5V–10V; powers internal circuitry and serves as voltage reference source |
| 3: GND | Ground reference | Common return path for VDD, MR, CT, and RESET; must be low-impedance for noise immunity |
| 4: MR | Manual reset input | Logic-low pulse ≥300ns asserts RESET; internally pulled up to VDD (100kΩ) |
| 5: CT | Capacitor time-delay programming | Connects to GND via capacitor (0–10µF) to set tD; floating = 50µs minimum delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables >10-year battery life in coin-cell–powered smoke detectors |
| Programmable reset delay | Single external capacitor (0–10µF) sets tD from 50µs to 6.2s - eliminates need for discrete timers or firmware delays |
| Glitch-immune VDD monitoring | 10µs minimum pulse rejection at 5% overdrive - suppresses EMI-induced false resets in motor-drive or switching-power environments |
| Push-pull active-low output | No external pull-up resistor needed - reduces BOM count and PCB area vs open-drain alternatives |
| Factory-trimmed 2.0V threshold | ±1.5% max accuracy over temperature - eliminates calibration overhead in production test |
Applications
| Smart Meter Power Supervision | Portable Medical Sensor Node |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 9V backup battery in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during brown-out or battery swap to prevent flash corruption. Use Value: 2.0V threshold aligns with MCU VCC min spec; 300nA IDD preserves battery charge during 15-year meter lifetime. |
Use Scenario: Ensures reliable boot in wearable ECG patch powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Resets SoC if VDD drops below 2.0V during RF transmission bursts or cold-temperature operation. Use Value: –40°C to +125°C rating covers clinical and outdoor use; 100mV hysteresis prevents oscillation during gradual battery discharge. |
| Industrial PLC I/O Module | Fire Alarm Control Panel |
Use Scenario: Supervises isolated 5V DC-DC output powering digital isolators and ADCs in factory automation I/O modules. IC Role / Device Role / Timing Role: Detects upstream 24V rail faults and asserts hardware reset before fieldbus communication fails. Use Value: 10V max VDD rating allows direct monitoring of unregulated 9V auxiliary rails; MR pin enables watchdog-triggered recovery. |
Use Scenario: Provides fail-safe reset for microcontroller managing smoke/heat sensor polling and siren drivers in Class A fire panels. IC Role / Device Role / Timing Role: Guarantees clean power-up sequence after AC mains interruption or battery switchover. Use Value: 6.2s maximum tD accommodates slow-charging backup capacitors; VPOR = 300mV prevents premature enable during VDD ramp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL25DBVR | 2.5V fixed threshold (vs 2.0V); identical package, pinout, and timing specs | Used where system brown-out threshold is set at 2.5V (e.g., 2.5V FPGA core rails) | Select when VDD nominal is ≥2.8V and 2.5V trip point better matches system margin requirements |
| MAX6372US20+T | 2.0V threshold, but 1.2µA IDD (4× higher), no MR input, fixed 200ms tD | Suitable for cost-sensitive consumer devices where programmable delay and manual reset are unnecessary | Choose only if ultra-low power is not critical and fixed delay suffices; lacks CT/MR flexibility of TPS3840PL20DBVR |
Compared with TPS3840PL25DBVR, the TPS3840PL20DBVR provides tighter alignment with 2.0V logic domains; compared with MAX6372US20+T, it delivers 4× lower quiescent current and full programmability - making it superior for long-life, feature-rich industrial designs.
Availability
TPS3840PL20DBVR is available at Aetrix Electronics and suitable for smart metering, portable medical instrumentation, industrial PLC I/O modules, and fire alarm systems requiring stable component supply across extended product lifecycles.
Supply support for TPS3840PL20DBVR 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 personal electronics markets.
The TPS3840 family was designed specifically for ultra-low-power, high-voltage rail supervision in battery-backed and harsh-environment systems - emphasizing nanoscale quiescent current, wide-VDD tolerance, and robust reset timing control.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL20DBVR?
The TPS3840PL20DBVR has a factory-set negative-going input threshold (VIT−) of 2.0V with ±1.5% maximum deviation over –40°C to +125°C and 1% typical accuracy. This value is laser-trimmed during production and does not require external calibration. The corresponding hysteresis (VHYS) is 100mV typical, yielding a VIT+ of 2.1V for reliable release behavior.
How does the CT pin function in the TPS3840PL20DBVR?
The CT pin on the TPS3840PL20DBVR sets the reset time delay (tD) via an external capacitor to GND. With no capacitor (floating), tD is 50µs minimum. Connecting 10nF yields ~6.2ms; 1µF yields ~619ms; 10µF yields ~6.2s. The internal CT resistance is 500kΩ (typ), and Equation tD = 618937 × CCT + 50µs applies for design calculations.
Can the TPS3840PL20DBVR monitor a 9V battery directly?
Yes - the TPS3840PL20DBVR supports VDD inputs from 1.5V to 10V, enabling direct monitoring of 9V alkaline or lithium batteries without external resistive dividers. Its 2.0V threshold ensures reset assertion well before battery depletion, while 300nA supply current minimizes load on aging cells.
What is the role of the MR pin in the TPS3840PL20DBVR?
The MR (Manual Reset) pin on the TPS3840PL20DBVR allows external initiation of reset: pulling MR ≤600mV for ≥300ns asserts RESET low. When left floating, an internal 100kΩ pull-up holds MR at VDD, disabling manual reset. This enables integration with microcontroller GPIOs for watchdog-triggered or user-initiated system recovery.
Does the TPS3840PL20DBVR require an external pull-up resistor on the RESET pin?
No - the TPS3840PL20DBVR uses a push-pull active-low output architecture. The RESET pin actively drives low (≤200mV @ 2mA) when asserted and high (≥0.8×VDD) when released, eliminating the need for an external pull-up resistor. This reduces component count, PCB area, and potential noise coupling from pull-up networks.
TPS3840PL20DBVR 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:
- 2V
- Output:
- Push-Pull, Totem Pole
- 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
TPS3840PL20DBVR FAQ
1.How can I place an order for TPS3840PL20DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL20DBVR 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 TPS3840PL20DBVR reliable?
The price and inventory of TPS3840PL20DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL20DBVR is usually 5 days.
3.What payment methods are accepted for TPS3840PL20DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3840PL20DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3840PL20DBVR?
TPS3840PL20DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL20DBVR 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 TPS3840PL20DBVR?
For technical support, including TPS3840PL20DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL20DBVR requirements.
6.How does Aetrix verify that TPS3840PL20DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL20DBVR 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 TPS3840PL20DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL20DBVR?
All TPS3840PL20DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL20DBVR, 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 TPS3840PL20DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL20DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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