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Texas Instruments TPS3840DL27DBVR
- Part No.:
- TPS3840DL27DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL27DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
TPS3840DL27DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 2.7V fixed threshold voltage (±1.5% max), 300nA typical supply current, and user-programmable reset delay via external capacitor on the CT pin. It monitors power rails in battery-powered or industrial systems where ultra-low quiescent current and precise brownout detection are critical.
For engineers reviewing the TPS3840DL27DBVR datasheet, TPS3840DL27DBVR pinout, TPS3840DL27DBVR application, or TPS3840DL27DBVR 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 differences.
Technical Context
The TPS3840DL27DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis (100mV typical for VIT− = 2.7V) and glitch-immune input monitoring. Its internal CT pin resistor (500kΩ typical) forms an RC timing network with an external capacitor to generate programmable reset delays from 50µs to 6.2s.
It features dual fault-detection paths: automatic assertion when VDD drops below 2.7V (VIT−) or manual assertion via MR pin pulled low (<600mV), both triggering the open-drain RESET output after configurable tD. Startup delay is 220µs typical, ensuring reliable power-on reset before system initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10V - supports direct monitoring of 3.3V, 5V, and 9V rails without external resistive dividers |
| Threshold Voltage (VIT−) | 2.7V ±1.5% max - factory-trimmed fixed threshold enabling precise brownout detection at 2.7V |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on portable and IoT edge devices |
| Reset Delay Range (tD) | 50µs (CT floating) to 6.2s (10µF) - enables flexible system-level reset timing without firmware intervention |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling during slow-rising/falling VDD transitions |
| Startup Delay (tSTRT) | 220µs typical - ensures stable internal biasing before first reset evaluation, critical for safe power-up |
| Operating Temperature | –40°C to +125°C - qualified for industrial and grid infrastructure environments |
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 | Open-drain active-low output | Requires external pull-up; sinks current during reset assertion; high-impedance otherwise |
| 2: VDD | Power supply and monitored rail input | Supplies internal circuitry and serves as the voltage being supervised; accepts 1.5V–10V |
| 3: GND | Analog and digital ground reference | Common return path for all internal blocks and external bypass capacitor |
| 4: MR | Active-low manual reset input | Pull to ≤600mV to force reset; floating or ≥0.7×VDD releases reset after tD |
| 5: CT | Capacitor time-delay programming node | Connects to GND via external capacitor (0–10µF) to set tD; floating yields 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 |
| Programmable reset delay | External capacitor on CT pin sets tD from 50µs to 6.2s - eliminates need for microcontroller timer resources |
| Factory-trimmed 2.7V threshold | ±1.5% max accuracy over –40°C to +125°C ensures reliable brownout detection across temperature |
| Glitch-immune MR and VDD inputs | 10µs minimum pulse rejection on MR and 15µs on VDD prevents false resets from EMI or noise spikes |
| Open-drain RESET with low leakage | 90nA max ILKG(OD) at 5.5V preserves signal integrity in high-impedance bus applications |
Applications
| Smart Meter Power Monitoring | Fire Alarm Control Panel |
|---|---|
Use Scenario: Monitors backup battery and main AC/DC supply in utility smart meters to detect undervoltage faults during grid instability. IC Role / Device Role / Timing Role: Supervisor IC asserting open-drain RESET to microcontroller upon VDD drop below 2.7V or MR-triggered emergency reset. Use Value: Prevents corrupted metering data and false billing by halting MCU execution before supply collapse, enabled by 220µs startup delay and 100mV hysteresis. | Use Scenario: Ensures fail-safe reset of smoke detector microcontroller during battery swap or low-battery condition in commercial fire panels. IC Role / Device Role / Timing Role: Voltage supervisor providing 2.7V brownout detection and manual reset initiation via panel control logic. Use Value: Guarantees deterministic system restart after power interruption using programmable 100ms–2s tD, avoiding race conditions in life-safety firmware. |
| Portable Medical Sensor | Industrial PLC Field Transmitter |
Use Scenario: Supervises coin-cell power in wearable ECG sensors, extending operational lifetime while maintaining FDA-grade reliability. IC Role / Device Role / Timing Role: Nano-power supervisor with 300nA IDD and 2.7V threshold, asserting RESET to halt analog front-end during battery depletion. Use Value: Enables >5-year shelf life and field operation via ultra-low quiescent current and accurate 2.7V trip point matched to Li-MnO2 discharge curve. | Use Scenario: Detects 24V DC supply sag in hazardous-area field transmitters used in oil/gas refineries. IC Role / Device Role / Timing Role: High-voltage supervisor monitoring 24V rail through external resistor divider; asserts RESET on VDD <2.7V (scaled). Use Value: Supports wide 1.5V–10V input range to accommodate 24V monitoring with minimal BOM cost-no additional LDO or regulator required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL27DBVR | Push-pull active-low RESET output; no external pull-up required; higher VOL (200mV @2mA) vs open-drain leakage | Better for driving heavy capacitive loads or noisy environments where pull-up resistor stability is unreliable | Select when board layout lacks space for pull-up or when driving long traces with >100pF load |
| MAX6326LT27D3+T | Fixed 2.7V threshold, 1.6µA IDD, 200ms fixed tD, SOT23-5; no CT pin or programmable delay | Lower integration: no manual reset or adjustable timing; suited for cost-sensitive, non-configurable designs | Select only if programmability and nano-power are not required and fixed 200ms delay suffices |
Compared with TPS3840PL27DBVR, the TPS3840DL27DBVR offers lower system-level power (no pull-up current) and design flexibility (external capacitor tuning), while MAX6326LT27D3+T trades configurability for lower unit cost and simpler implementation where timing is static.
Availability
TPS3840DL27DBVR is available at Aetrix Electronics and suitable for smart metering, fire safety systems, portable medical sensors, and industrial field transmitters requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TPS3840DL27DBVR 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 is designed for ultra-low-power voltage supervision in battery-critical and harsh-environment applications, emphasizing nanoscale quiescent current, wide input voltage tolerance, and robust reset timing control.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL27DBVR?
The TPS3840DL27DBVR has a factory-set negative-going input threshold voltage (VIT−) of 2.7V, with accuracy of ±1.5% maximum over –40°C to +125°C and ±1% typical. This value is laser-trimmed and specified in TI's official datasheet SNVSB03E, Table 6-5, under "VIT- Negative-going input threshold accuracy".
Does the TPS3840DL27DBVR require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL27DBVR 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; TI recommends 100kΩ in the datasheet for low-current applications. Without it, the RESET signal cannot reach a valid high state.
How is the reset delay time (tD) programmed on the TPS3840DL27DBVR?
The reset delay time (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor (CT floating), tD = 50µs minimum. Using a 10µF capacitor yields up to 6.2s. The relationship follows tD ≈ 618937 × CCT_EXT + 50µs, per Equation 4 in the TPS3840DL27DBVR datasheet.
What is the maximum operating voltage and absolute maximum rating for VDD on the TPS3840DL27DBVR?
The recommended operating range for VDD is 1.5V to 10V. The absolute maximum rating is 12V, beyond which permanent damage may occur. Operation above 10V is not guaranteed for functionality or reliability, and thermal stress increases significantly above 10V due to RθJA = 187.5°C/W.
Can the TPS3840DL27DBVR monitor a 24V supply directly?
No, the TPS3840DL27DBVR cannot monitor 24V directly-it exceeds the 10V maximum operating voltage. To supervise a 24V rail, use an external resistor divider to scale the voltage down to ≤10V at the VDD pin, ensuring the divided voltage remains ≥1.5V and retains sufficient noise margin for the 2.7V threshold detection.
TPS3840DL27DBVR 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:
- 2.7V
- 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
TPS3840DL27DBVR FAQ
1.How can I place an order for TPS3840DL27DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL27DBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
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6.How does Aetrix verify that TPS3840DL27DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL27DBVR 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 TPS3840DL27DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL27DBVR?
All TPS3840DL27DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL27DBVR, 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 TPS3840DL27DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL27DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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