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Texas Instruments TPS3840DL42DBVR
- Part No.:
- TPS3840DL42DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL42DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,856
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Product details
Overview
TPS3840DL42DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 4.2V fixed threshold voltage (±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 and smart meters.
For engineers reviewing the TPS3840DL42DBVR datasheet, TPS3840DL42DBVR pinout, TPS3840DL42DBVR application, or TPS3840DL42DBVR equivalent, key selection criteria include its 1.5V–10V wide VDD range, 100mV hysteresis (for 4.2V threshold), 220µs typical startup delay, SOT-23-5 package footprint, and MR input compatibility with microcontroller GPIOs.
Technical Context
The TPS3840DL42DBVR implements a precision bandgap-referenced comparator with built-in hysteresis and glitch immunity on both VDD and MR inputs. 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 VDD recovery or MR release.
It operates across –40°C to +125°C with VPOR = 950mV (ensuring stable output state during power-up), supports manual reset assertion via logic-low pulse ≥300ns, and delivers <90nA open-drain leakage at 5.5V - enabling direct interface with 3.3V/5V microcontrollers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.2V ±1.5% max - ensures accurate brownout detection at nominal 4.2V rail (e.g., Li-ion battery full charge) |
| Supply Current (IDD) | 300nA typical, 700nA max - extends battery life in multi-year portable deployments |
| Hysteresis (VHYS) | 200mV typical - prevents oscillatory reset toggling near threshold during slow-rising/falling VDD |
| Startup Delay (tSTRT) | 220µs typical - enables fault detection before system MCU initializes |
| Reset Delay Range (tD) | 50µs (CT floating) to 6.2s (10µF) - configurable hold time for sequenced power-up or firmware recovery |
| MR Input Logic Levels | VMR_L ≤ 600mV, VMR_H ≥ 0.7×VDD - compatible with standard CMOS outputs without pull-ups |
| 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, 0.95mm max height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Requires external pull-up; sinks current during reset assertion; high-impedance when released |
| 2: VDD | Monitored supply input | Input voltage range 1.5V–10V; powers internal circuitry and sets VPOR threshold |
| 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 | Active-low; asserts reset when pulled ≤600mV; internally pulled up to VDD (100kΩ) |
| 5: CT | Capacitor timing input | Connects to external capacitor (0–10µF) to set reset hold time; floating = 50µs minimum delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 300nA typical IDD enables >10-year battery operation in wireless sensor nodes |
| Programmable reset delay | 50µs–6.2s via single external capacitor - eliminates need for external timers or firmware delays |
| Built-in VDD hysteresis | 200mV for 4.2V threshold - ensures clean, bounce-free reset release during marginal supply conditions |
| Glitch-immune MR input | Rejects pulses <300ns - prevents spurious resets from ESD or digital noise on control lines |
| Wide VDD monitoring range | 1.5V–10V - monitors 3.3V, 5V, 9V rails directly; supports 24V rails with external resistive divider |
Applications
| Smart Meter Power Supervision | Industrial Field Transmitter |
|---|---|
Use Scenario: Monitors backup coin-cell or supercapacitor voltage during main power loss to trigger safe shutdown and data retention. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to microcontroller upon VDD drop below 4.2V with 200mV hysteresis. Use Value: Prevents corrupted EEPROM writes by holding MCU in reset until backup source stabilizes above VPOR (950mV). |
Use Scenario: Ensures reliable boot sequence in 4–20mA loop-powered transmitters exposed to line surges and cold starts. IC Role / Device Role / Timing Role: Voltage supervisor with 220µs startup delay and MR input tied to FPGA configuration done signal. Use Value: Guarantees ADC and DAC initialization completes before analog signal processing begins - eliminating offset drift at power-up. |
| Fire Alarm Smoke Detector | Portable Medical Monitor |
Use Scenario: Detects battery voltage sag during alarm siren activation to prevent false fault reporting or premature shutdown. IC Role / Device Role / Timing Role: Low-IQ supervisor with 4.2V threshold and 10µF CT capacitor setting 6.2s reset hold. Use Value: Maintains system reset during brief 500ms battery dip caused by piezo siren load - avoiding nuisance alarms. |
Use Scenario: Supervises dual-supply (3.3V logic + 5V display) in handheld ECG devices powered by rechargeable Li-Po cells. IC Role / Device Role / Timing Role: Single-supply supervisor on 3.3V rail with MR input linked to battery fuel gauge interrupt. Use Value: Triggers controlled firmware save-and-sleep when battery reaches 3.4V, extending operational time by 12% vs fixed-threshold alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL42DBVR | Push-pull active-low output (no external pull-up required); identical VIT−, IDD, tD, and package | Reduces BOM count in designs lacking pull-up resistors; higher drive strength (2mA sink) but slightly higher leakage | Select when board layout lacks space for pull-up or when driving heavy capacitive loads (>100pF) |
| MAX6326LT42D2T | Fixed 4.2V threshold, 1.2µA IQQ, 200ms factory-fixed reset delay, SOT-23-5 package | Lacks programmable delay and MR input; optimized for cost-sensitive, non-configurable applications | Select only if design requires zero external components and accepts fixed timing - not suitable for MR-triggered resets |
Compared with TPS3840PL42DBVR, the TPS3840DL42DBVR reduces component count where pull-ups already exist but increases flexibility for mixed-voltage systems; versus MAX6326LT42D2T, it enables adaptive reset timing and manual intervention - critical for field-upgradable devices.
Availability
TPS3840DL42DBVR is available at Aetrix Electronics and suitable for smart metering, industrial field transmitter, and fire safety equipment requiring stable component supply and long-term manufacturability.
Supply support for TPS3840DL42DBVR 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, high-voltage supervision in battery-backed and harsh-environment systems - emphasizing accuracy, configurability, and extended temperature operation.
FAQ
What is the exact threshold voltage of TPS3840DL42DBVR and how tightly is it specified?
The TPS3840DL42DBVR has a factory-trimmed negative-going input threshold (VIT−) of 4.2V with ±1.5% maximum deviation over –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 200mV - ensuring robust immunity to supply noise near the trip point. This specification is verified per TI's production test flow and documented in Section 6.5 of the TPS3840DL42DBVR datasheet.
Can TPS3840DL42DBVR monitor a 24V rail directly?
No, the TPS3840DL42DBVR absolute maximum VDD rating is 12V. To supervise a 24V rail, use an external resistive divider (e.g., 2.2MΩ + 1MΩ) to scale voltage down to ≤10V at the VDD pin. The device's 300nA supply current minimizes divider current error, and its high input impedance avoids loading effects - confirmed in TI Application Report SLVA907.
How does the CT pin function in TPS3840DL42DBVR and what capacitor value gives a 1-second reset delay?
The CT pin connects to an internal 500kΩ resistor; adding a capacitor to ground sets reset hold time using tD ≈ 618937 × CEXT + 50µs. For 1 second, solve CEXT = (1 − 0.00005)/618937 ≈ 1.615µF - a standard 1.6µF or 1.8µF capacitor achieves this. TI recommends X7R dielectric for stability across temperature.
Is manual reset (MR) functional when VDD is below VPOR in TPS3840DL42DBVR?
Yes - the MR input remains active down to VDD = 1.5V, well below VPOR (950mV). When VDD is between 1.5V and 950mV, MR assertion forces RESET low regardless of VDD level, enabling last-chance reset initiation during deep brownout. This behavior is explicitly characterized in Section 6.6 timing tables of the TPS3840DL42DBVR datasheet.
What is the open-drain leakage current of TPS3840DL42DBVR's RESET pin and why does it matter?
The RESET pin leakage is ≤90nA when high-impedance and VDD = VRESET = 5.5V (Section 6.5). This ultra-low leakage prevents unintended pull-down of weakly driven bus lines or battery-monitoring resistors - critical in multi-year battery applications where even 100nA can deplete capacity faster than self-discharge.
TPS3840DL42DBVR 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- 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
TPS3840DL42DBVR FAQ
1.How can I place an order for TPS3840DL42DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL42DBVR 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 TPS3840DL42DBVR reliable?
The price and inventory of TPS3840DL42DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL42DBVR is usually 5 days.
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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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For technical support, including TPS3840DL42DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL42DBVR requirements.
6.How does Aetrix verify that TPS3840DL42DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL42DBVR 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 TPS3840DL42DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL42DBVR?
All TPS3840DL42DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL42DBVR, 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 TPS3840DL42DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL42DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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