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Texas Instruments TPS3840DL30DBVR
- Part No.:
- TPS3840DL30DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL30DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,857
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Product details
Overview
TPS3840DL30DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, fixed 3.0V threshold (±1.5% max), 300nA typical supply current, and programmable reset delay up to 6.2s via external capacitor on CT pin-used for reliable power-on-reset and brownout detection in battery-powered industrial sensors.
For engineers reviewing the TPS3840DL30DBVR datasheet, TPS3840DL30DBVR pinout, TPS3840DL30DBVR application, or TPS3840DL30DBVR equivalent, key selection criteria include its 1.5V–10V operating range, 100mV hysteresis (typical) at 3.0V threshold, 220µs startup delay, SOT-23-5 package footprint, and MR input compatibility with 3.3V/5V logic systems.
Technical Context
The TPS3840DL30DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis and glitch immunity on both VDD and MR inputs. Its internal CT pin resistor (500kΩ typ) forms an RC time constant with external capacitor to generate user-defined reset hold times.
It operates across –40°C to +125°C with 1% typical VIT− accuracy and supports fast fault response: propagation delay from VDD drop to RESET assertion is 30µs max, while MR-triggered reset asserts within 700ns. The open-drain RESET output requires an external pull-up and sinks ≤2mA at VOL ≤200mV.
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 level-shifting or external resistive dividers |
| Threshold Voltage (VIT−) | 3.0V ±1.5% - factory-trimmed fixed threshold optimized for 3.3V system POR and brownout detection |
| Supply Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on IoT nodes and portable meters |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling during slow-rising/falling supply transitions |
| Startup Delay (tSTRT) | 220µs typical - ensures stable internal biasing before enabling downstream circuitry after power-up |
| Reset Delay Range (tD) | 50µs (no cap) to 6.2s (10µF) - configurable timing for sequenced power-up or firmware initialization windows |
| Operating Temperature | –40°C to +125°C - qualified for industrial control, smart metering, and automotive under-hood auxiliary monitoring |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, 0.95mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Sinks current when asserted; requires external pull-up to VDD or another rail; compatible with 1.8V–10V logic interfaces |
| 2: VDD | Power input and monitored rail | Supplies internal circuitry and serves as the voltage being supervised; accepts 1.5V–10V directly |
| 3: GND | Ground reference | Analog and digital ground return; must be low-impedance path to minimize noise coupling into threshold detection |
| 4: MR | Active-low manual reset input | Pulled low by host MCU GPIO to force reset; internally pulled up to VDD (100kΩ); tolerant of 0–12V input |
| 5: CT | Capacitor time-delay programming node | Connects to GND via external capacitor (0–10µF) to set reset hold time; floating for minimum 50µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables >10-year battery life in coin-cell-powered smoke detectors and remote sensors |
| Programmable reset delay | External capacitor on CT pin sets tD from 50µs to 6.2s-supports firmware boot sequencing and multi-rail power management |
| Built-in hysteresis | 100mV (at 3.0V threshold) eliminates false resets during marginal supply recovery without external components |
| Glitch-immune MR and VDD inputs | Rejects transients <10µs wide at 5% overdrive-ensures robustness in electrically noisy factory automation environments |
| Wide temperature range | –40°C to +125°C operation validated per AEC-Q100 stress tests-suitable for outdoor grid infrastructure and HVAC controllers |
Applications
| Smart Meter Power Supervision | Portable Gas Detector |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 9V backup battery in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to halt MCU execution during brownout or battery depletion. Use Value: Prevents corrupted flash writes and data loss during undervoltage events using 3.0V threshold with 100mV hysteresis and 220µs startup delay. | Use Scenario: Powers ultra-low-power electrochemical gas sensor node with CR2032 coin cell for 5+ years. IC Role / Device Role / Timing Role: Nano-current supervisor enabling wake-up reset and POR with 300nA quiescent draw. Use Value: Extends operational lifetime by minimizing standby current while ensuring reliable cold-start behavior at –40°C. |
| PLC I/O Module Protection | Fire Alarm Control Panel |
Use Scenario: Secures 24V field bus interface in industrial PLC backplane modules exposed to EFT and surge events. IC Role / Device Role / Timing Role: High-voltage supervisor detecting rail collapse and initiating controlled shutdown via MR-linked FPGA reset. Use Value: 10V absolute max rating and glitch immunity protect against 4kV EFT bursts; 1.5V–10V range avoids external divider losses. | Use Scenario: Ensures fail-safe operation of NFPA 72-certified fire alarm panels with dual 5V/12V supplies. IC Role / Device Role / Timing Role: Dual-rail monitor using one TPS3840DL30DBVR per supply, with MR tied to smoke sensor interrupt line. Use Value: Active-low open-drain outputs interface directly to legacy alarm logic; 125°C rating supports enclosed panel thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL30DBVR | Push-pull active-low RESET output; no external pull-up required; higher sink current (2mA vs open-drain leakage-limited) | Better suited for driving heavy capacitive loads or TTL inputs directly; less flexible for mixed-voltage interfacing | Select when board layout lacks space for pull-up resistor or when driving long traces with >100pF load |
| MAX6326LT31D2T | 3.09V threshold (±2.5%), 1.6µA typical IDD, SOT23-5, fixed 200ms reset timeout, no MR or CT pin | Fixed delay only; no manual reset or programmability; higher current draw limits battery life | Choose for cost-sensitive, non-battery applications where simple fixed-delay reset suffices and design freeze prohibits component changes |
Compared with TPS3840PL30DBVR, the TPS3840DL30DBVR offers superior voltage-level flexibility via open-drain output but requires a pull-up; versus MAX6326LT31D2T, it delivers 5× lower quiescent current and full programmability-critical for energy harvesting and long-life deployments.
Availability
TPS3840DL30DBVR is available at Aetrix Electronics and suitable for smart metering, portable safety sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3840DL30DBVR 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS3840 family was designed specifically for ultra-low-power, high-voltage supervision in battery-backed and wide-input industrial systems-emphasizing nanoscale current, factory-trimmed accuracy, and field-programmable timing.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL30DBVR?
The TPS3840DL30DBVR has a factory-set negative-going input threshold (VIT−) of 3.0V 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. Hysteresis is 100mV typical, yielding VIT+ = 3.1V for clean release behavior.
How do I configure the reset delay time for the TPS3840DL30DBVR?
Connect a capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50µs. A 100nF capacitor yields ~62ms; 1µF gives ~619ms; 10µF achieves ~6.2s. The relationship follows tD = 618937 × CCT_EXT + 50µs. Use X7R or C0G dielectrics for stability across temperature.
Can the TPS3840DL30DBVR monitor a 9V battery directly without external resistors?
Yes. The TPS3840DL30DBVR supports 1.5V–10V VDD operation, so a 9V alkaline or lithium battery can connect directly to VDD (Pin 2) for supervision. Its 3.0V threshold ensures reliable reset assertion before brownout affects connected 3.3V microcontrollers, eliminating need for voltage dividers and their associated current drain.
What is the function of the MR pin on the TPS3840DL30DBVR, and how should it be used?
The MR pin (Pin 4) is an active-low manual reset input. Pulling it below 600mV (VMR_L) forces RESET assertion regardless of VDD level. It features 100kΩ internal pull-up, so leaving it unconnected defaults to inactive. For MCU-driven reset, drive MR from a GPIO with ≥300ns pulse width-no external pull-down needed.
Is the TPS3840DL30DBVR compatible with 1.8V logic systems?
Yes-the open-drain RESET output can be pulled up to any voltage ≤10V, including 1.8V. When VDD = 3.0V or higher, the RESET pin sinks ≤2mA while holding VOL ≤200mV, meeting 1.8V logic LOW requirements. MR input accepts 0–12V, making it interoperable with 1.8V, 3.3V, and 5V controllers without level shifters.
TPS3840DL30DBVR 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:
- 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
TPS3840DL30DBVR FAQ
1.How can I place an order for TPS3840DL30DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL30DBVR 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 TPS3840DL30DBVR reliable?
The price and inventory of TPS3840DL30DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL30DBVR is usually 5 days.
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Once your TPS3840DL30DBVR 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 TPS3840DL30DBVR?
For technical support, including TPS3840DL30DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL30DBVR requirements.
6.How does Aetrix verify that TPS3840DL30DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL30DBVR 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 TPS3840DL30DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL30DBVR?
All TPS3840DL30DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL30DBVR, 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 TPS3840DL30DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL30DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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