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Texas Instruments TPS3840PL30DBVR
- Part No.:
- TPS3840PL30DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL30DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,568
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Product details
Overview
TPS3840PL30DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 3.0V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay (50µs to 6.2s via external capacitor). It monitors VDD rails up to 10V in battery-powered or industrial power-rail supervision applications.
For engineers reviewing the TPS3840PL30DBVR datasheet, TPS3840PL30DBVR pinout, TPS3840PL30DBVR application, or TPS3840PL30DBVR equivalent, key selection criteria include its 3.0V detection accuracy, SOT-23-5 package footprint, MR input compatibility with microcontroller GPIOs, and guaranteed operation across –40°C to +125°C.
Technical Context
The TPS3840PL30DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typical for 3.0V threshold) and glitch-immune VDD sensing. Its internal CT pin resistor (500kΩ typical) forms an RC timing network with an external capacitor to generate a user-defined reset hold time after fault recovery.
It features dual-trigger reset assertion: voltage drop below 3.0V on VDD or logic-low pulse (>300ns) on MR pin. Reset release requires both VDD > 3.1V (VIT+ = VIT− + VHYS) and expiration of tD - ensuring stable deassertion even during marginal supply recovery.
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−) | 3.0V ±1.5% (max) - factory-trimmed fixed threshold with 100mV typical hysteresis for noise immunity. |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on systems and minimizes loading on high-impedance supplies. |
| Reset Delay (tD) | 50µs (CT floating) to 6.2s (10µF) - programmable via single external capacitor; no additional ICs required. |
| Startup Delay (tSTRT) | 220µs typical - ensures reliable reset assertion before system power-up completes, critical for safety-critical start-up. |
| Operating Temperature | –40°C to +125°C - qualified for industrial, grid infrastructure, and automotive under-hood environments. |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor; sinks 2mA at VOL ≤ 200mV. |
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 | Active-low push-pull output | Drives low (≤200mV @ 2mA) during reset; high-impedance release not applicable - full rail-to-rail drive capability. |
| 2: VDD | Power input & monitored rail | Supplies internal circuitry and serves as the voltage being supervised; accepts 1.5V–10V directly. |
| 3: GND | Reference ground | Common return path for VDD, MR, CT, and RESET; must be low-impedance for accurate threshold detection. |
| 4: MR | Manual reset input | Logic-low pulse ≥300ns asserts RESET; internally pulled up to VDD (100kΩ); compatible with 1.8V/3.3V/5V GPIOs. |
| 5: CT | Capacitor timing terminal | Connects to external capacitor (0–10µF) to set reset hold time; floating for minimum 50µs delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical supply current enables multi-year battery life in wireless sensors and portable meters. |
| Factory-trimmed 3.0V threshold | ±1.5% max accuracy over temperature eliminates calibration overhead in production test. |
| Programmable reset delay | Single external capacitor sets delay from 50µs to 6.2s - replaces discrete RC timers and logic gates. |
| Glitch-immune VDD sensing | 10µs minimum pulse rejection at 5% overdrive prevents false resets from EMI or switching noise. |
| Wide temperature range | –40°C to +125°C operation supports deployment in smart meters, PLCs, and HVAC controllers. |
Applications
| Smart Meter Power Supervision | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V or 5V MCU supply in ANSI C12.22-compliant electricity meters operating on lithium-thionyl chloride batteries. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt firmware execution during brownout or battery depletion. Use Value: 300nA quiescent current preserves battery capacity for >10 years; 3.0V threshold matches MCU VDD tolerance; MR pin enables remote firmware-initiated reset via communication interface. |
Use Scenario: Ensures deterministic startup and fault recovery in DIN-rail mounted PLC digital I/O modules exposed to 24V field wiring transients. IC Role / Device Role / Timing Role: Supervises isolated 5V logic rail; asserts RESET on undervoltage or manual command to prevent metastability in FPGA configuration. Use Value: 100mV hysteresis rejects noise on noisy 24V-to-5V DC/DC outputs; 125°C rating survives enclosure thermal stress; push-pull output drives FPGA PROG_B directly. |
| Fire Alarm Control Panel | Portable Gas Detector |
|
Use Scenario: Provides fail-safe power-on reset and brownout protection for microcontroller-based fire alarm panels compliant with UL 864. IC Role / Device Role / Timing Role: Detects 9V backup battery sag below 3.0V and initiates system reset via MR-linked smoke sensor interrupt line. Use Value: 10V absolute max rating allows direct 9V battery connection; 220µs startup delay guarantees reset assertion before MCU clock stabilizes; MR pin enables sensor-triggered reset without software intervention. |
Use Scenario: Supervises 3.3V supply in intrinsically safe, battery-operated gas detectors requiring ATEX/IECEx certification. IC Role / Device Role / Timing Role: Resets sensor ADC and RF transceiver upon Li-ion cell voltage drop below 3.0V during deep discharge. Use Value: Nano-power consumption meets <1µA system sleep budget; 3.0V threshold aligns with battery end-of-life cutoff; SOT-23-5 footprint minimizes PCB area in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL33DBVR | 3.3V fixed threshold (±1.5% max), identical package, pinout, and timing specs. | Used where system VDD nominal is 3.3V and margin above 3.0V is insufficient for reliable detection. | Select when VDD nominal is 3.3V and 3.0V threshold risks premature reset due to normal ripple or load transient. |
| MAX6326LT31D2T | 3.08V threshold (±2.5%), 1.6µA typical IQ, SOT-23-5, open-drain output requiring external pull-up. | Lacks programmable delay; suited for simpler, cost-sensitive designs where fixed 200ms delay suffices. | Choose when ultra-low IQ is secondary to BOM simplicity and legacy design reuse; verify pull-up resistor sizing for bus capacitance. |
Compared with TPS3840PL30DBVR, TPS3840PL33DBVR offers tighter alignment to 3.3V rails but same nano-power and programmability, while MAX6326LT31D2T trades IQ and flexibility for lower unit cost and established qualification in consumer-grade equipment.
Availability
TPS3840PL30DBVR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, fire safety systems, and portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for TPS3840PL30DBVR 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 communications markets.
The TPS3840 family was designed specifically for ultra-low-power, high-voltage rail supervision in battery-backed and harsh-environment systems - emphasizing nanoscale IQ, wide-VDD operation, and robust reset timing control.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL30DBVR?
The TPS3840PL30DBVR has a factory-trimmed negative-going input threshold (VIT−) of 3.0V with ±1.5% maximum accuracy over –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 100mV (typical), resulting in VIT+ = 3.1V. This is confirmed in Section 6.5 Electrical Characteristics of the official TI datasheet SNVSB03E.
Does the TPS3840PL30DBVR require an external pull-up resistor on the RESET pin?
No. The TPS3840PL30DBVR uses a push-pull active-low output architecture, so the RESET pin actively drives low during assertion and high during release - no external pull-up resistor is needed. This distinguishes it from open-drain variants like TPS3840DL30DBVR, which do require a pull-up.
How is the reset delay time programmed on the TPS3840PL30DBVR?
The reset delay (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, tD = 50µs (minimum). Using a 10µF capacitor yields ~6.2s maximum delay. The relationship follows tD = 618937 × CCT_EXT + 50µs, where CCT_EXT is in farads - per Equation 4 in the TI datasheet.
Can the TPS3840PL30DBVR monitor a 9V battery directly without external components?
Yes. The TPS3840PL30DBVR supports VDD inputs from 1.5V to 10V, allowing direct connection to 9V alkaline or lithium batteries. Its 3.0V threshold reliably detects end-of-life voltage sag, and the 12V absolute maximum rating provides margin against load dump transients.
What is the function of the MR pin on the TPS3840PL30DBVR?
MR (Manual Reset) is an active-low input that forces RESET assertion when pulled below 600mV (VMR_L) for ≥300ns. It is internally pulled up to VDD (100kΩ), enabling direct connection to microcontroller GPIOs. When left floating or held above VMR_H (0.7×VDD), it does not affect reset behavior.
TPS3840PL30DBVR 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:
- 3V
- 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
TPS3840PL30DBVR FAQ
1.How can I place an order for TPS3840PL30DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL30DBVR 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 TPS3840PL30DBVR reliable?
The price and inventory of TPS3840PL30DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL30DBVR is usually 5 days.
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TPS3840PL30DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL30DBVR 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 TPS3840PL30DBVR?
For technical support, including TPS3840PL30DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL30DBVR requirements.
6.How does Aetrix verify that TPS3840PL30DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL30DBVR 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 TPS3840PL30DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL30DBVR?
All TPS3840PL30DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL30DBVR, 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 TPS3840PL30DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL30DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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