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Texas Instruments TPS3840PL25DBVR
- Part No.:
- TPS3840PL25DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL25DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:737
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Product details
Overview
TPS3840PL25DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 2.5V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay up to 6.2s via external capacitor on CT pin. It monitors power rails in battery-backed systems and industrial controllers where ultra-low quiescent current and precise voltage supervision are critical.
For engineers reviewing the TPS3840PL25DBVR datasheet, TPS3840PL25DBVR pinout, TPS3840PL25DBVR application, or TPS3840PL25DBVR equivalent, this page delivers verified specifications, SOT-23-5 package details, functional pin roles, real-world use cases in smart meters and fire safety systems, and two validated alternative parts with documented technical and application differences.
Technical Context
The TPS3840PL25DBVR implements a precision bandgap-based comparator with built-in hysteresis (100mV typical for 2.5V threshold) and glitch-immune VDD sensing. Its internal CT pin resistor (500kΩ typical) forms an RC time constant with an external capacitor to generate a user-defined reset hold time after power-up or fault recovery.
It features dual-trigger reset assertion: voltage drop below 2.5V at VDD or logic-low pulse on MR pin (≥300ns width). Reset release requires both VDD > 2.6V (2.5V + hysteresis) and MR ≥ 0.7×VDD, followed by expiration of the programmed tD delay - ensuring robust power sequencing in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10V - enables direct monitoring of 3.3V, 5V, 9V battery rails without level-shifting or resistive dividers. |
| Threshold Voltage (VIT−) | 2.5V ±1.5% (max) - factory-trimmed fixed threshold ensures accurate brownout detection for 2.5V logic domains. |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on IoT sensors and portable medical devices. |
| Startup Delay (tSTRT) | 220µs typical - asserts reset before downstream microcontrollers power up, preventing unsafe initialization. |
| Reset Delay Range (tD) | 50µs (CT floating) to 6.2s (10µF cap) - supports flexible system-level reset timing across diverse firmware boot sequences. |
| Hysteresis (VHYS) | 100mV typical - prevents chatter during slow-rising/falling VDD transitions near 2.5V threshold. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules, industrial PLCs, and grid infrastructure equipment. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, RoHS-compliant, thermal resistance RθJA = 187.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low (≤200mV @ 2mA sink) to assert reset; drives high (≥0.8×VDD) to release - no external pull-up required. |
| 2: VDD | Monitored supply input | Input voltage source and internal power rail; monitored for drop below 2.5V; supports 1.5–10V operation. |
| 3: GND | Ground reference | Analog and digital ground return path; must be low-impedance for stable threshold accuracy and noise immunity. |
| 4: MR | Manual reset input | Logic-low pulse ≥300ns initiates reset; internally pulled up to VDD (100kΩ); floats safely when unused. |
| 5: CT | Capacitor time-delay control | Connects to GND via external capacitor (0–10µF) to set reset hold time; left floating for minimum 50µs delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables multi-year battery life in wireless sensor nodes and energy-harvesting systems. |
| Programmable reset timing | External capacitor on CT pin sets tD from 50µs to 6.2s - eliminates need for external timers or µC-based delays. |
| Built-in hysteresis | 100mV typical for 2.5V threshold prevents false releases during marginal VDD recovery - no external components needed. |
| Glitch-immune MR and VDD inputs | 10µs minimum pulse rejection on MR and VDD - suppresses EMI-induced resets in motor-driven or switching-power environments. |
| Wide temperature range | –40°C to +125°C operation supports deployment in uncontrolled industrial enclosures and outdoor metering units. |
Applications
| Smart Meter Power Supervision | Fire Alarm Control Panel |
|---|---|
|
Use Scenario: Monitors backup lithium battery voltage (3.0–3.6V) and main 5V DC supply in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Supervisor asserts active-low RESET to MCU if VDD drops below 2.5V or MR is pulsed during firmware update. Use Value: Prevents corrupted flash writes and invalid meter readings during brownout events; 300nA current draw preserves battery for >10 years. |
Use Scenario: Ensures reliable power-on reset and fault recovery in UL864-listed fire alarm panels operating from 24VAC/DC with battery backup. IC Role / Device Role / Timing Role: Detects 24V rail collapse and triggers system-wide reset via push-pull RESET; CT pin set to 100ms delay for controlled sequencer startup. Use Value: Meets NFPA 72 fault-tolerance requirements; hysteresis avoids nuisance resets during transformer inrush transients. |
| Portable Medical Monitor | Industrial Field Transmitter |
|
Use Scenario: Supervises dual-supply (3.3V logic + 5V analog) in handheld ECG devices powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Resets system if main rail falls below 2.5V during deep discharge; MR pin tied to button for user-initiated calibration reset. Use Value: Nano-current consumption extends clinical-grade runtime between charges; 220µs startup delay guarantees reset before ADC initialization. |
Use Scenario: Provides fail-safe reset for HART-enabled 4–20mA loop-powered transmitters in hazardous-area process plants (ATEX Zone 1). IC Role / Device Role / Timing Role: Monitors internal 3.3V LDO output; asserts RESET on undervoltage or MR signal from host controller during configuration. Use Value: –40°C to +125°C rating ensures operation inside explosion-proof enclosures; 1.5% threshold accuracy maintains loop integrity per IEC 61000-4-28. |
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 (vs. 2.5V); identical package, pinout, and timing specs. | Used where system logic operates at 3.3V and brownout must occur above 3.0V. | Select when VDD nominal is ≥3.3V and 2.5V threshold would cause premature reset. |
| MAX6326LT25D3+T | 2.5V threshold, 1.6µA typical IQ (vs. 0.3µA), SOT-23-5, open-drain output (requires pull-up). | Higher supply current limits battery life; open-drain output adds BOM cost and layout complexity. | Choose only if legacy MAXIM design reuse is required; not recommended for new ultra-low-power designs. |
Compared with TPS3840PL25DBVR, TPS3840PL33DBVR offers identical functionality at a higher threshold ideal for 3.3V systems, while MAX6326LT25D3+T trades 5× higher quiescent current and open-drain limitations for second-source availability - making the TPS3840PL25DBVR optimal for long-life, space-constrained, and cost-sensitive 2.5V supervision.
Availability
TPS3840PL25DBVR is available at Aetrix Electronics and suitable for smart metering, fire safety systems, portable medical devices, and industrial field transmitters requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TPS3840PL25DBVR 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 over 90 years of innovation in industrial, automotive, and consumer electronics.
The TPS3840 family was designed specifically for ultra-low-power voltage supervision in battery-critical and harsh-environment applications, delivering nanoscale current efficiency without sacrificing accuracy, timing control, or reliability.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL25DBVR?
The TPS3840PL25DBVR has a factory-set negative-going input threshold (VIT−) of 2.5V with ±1.5% maximum deviation across –40°C to +125°C, and 1% typical accuracy at 25°C. This value is laser-trimmed and specified in TI's SNVSB03E datasheet Section 6.5, Table "VIT− Negative-going input threshold accuracy".
Does the TPS3840PL25DBVR require an external pull-up resistor on the RESET pin?
No. The TPS3840PL25DBVR uses a push-pull active-low output architecture, so the RESET pin actively drives low (≤200mV @ 2mA sink) and high (≥0.8×VDD) without needing an external pull-up resistor - unlike open-drain variants such as TPS3840DL25DBVR.
How is the reset delay time (tD) calculated for the TPS3840PL25DBVR?
The TPS3840PL25DBVR reset delay is calculated using tD = 618937 × CCT_EXT + 50µs, where CCT_EXT is the external capacitor (in farads) connected between CT and GND. For example, a 100nF capacitor yields ~62ms delay. Full derivation and tolerance analysis appear in Section 7.3.2 of the datasheet.
Can the TPS3840PL25DBVR monitor a 9V battery directly?
Yes. The TPS3840PL25DBVR supports 1.5V to 10V VDD operation, allowing direct connection to 9V alkaline or lithium batteries without external resistive dividers - simplifying BOM and improving accuracy versus resistor-based solutions.
What is the function of the CT pin on the TPS3840PL25DBVR?
The CT pin on the TPS3840PL25DBVR sets the reset time delay (tD) by forming an RC network with an external capacitor to GND. With no capacitor (floating), tD = 50µs; with 10µF, tD ≈ 6.2s. Internal RCT = 500kΩ (typical) defines the time constant - enabling precise, adjustable reset hold timing without software intervention.
TPS3840PL25DBVR 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:
- 2.5V
- 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
TPS3840PL25DBVR FAQ
1.How can I place an order for TPS3840PL25DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL25DBVR 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 TPS3840PL25DBVR reliable?
The price and inventory of TPS3840PL25DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL25DBVR is usually 5 days.
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4.How is shipping managed for TPS3840PL25DBVR?
TPS3840PL25DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL25DBVR 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 TPS3840PL25DBVR?
For technical support, including TPS3840PL25DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL25DBVR requirements.
6.How does Aetrix verify that TPS3840PL25DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL25DBVR 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 TPS3840PL25DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL25DBVR?
All TPS3840PL25DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL25DBVR, 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 TPS3840PL25DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL25DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS3840PL25DBVR Tags
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