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Texas Instruments TPS3840PL29DBVR
- Part No.:
- TPS3840PL29DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL29DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:333
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Product details
Overview
TPS3840PL29DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 2.9V 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-powered industrial sensors and smart meters.
For engineers reviewing the TPS3840PL29DBVR datasheet, TPS3840PL29DBVR pinout, TPS3840PL29DBVR application, or TPS3840PL29DBVR equivalent, key selection criteria include its 1.5V–10V operating range, 220µs typical startup delay, built-in hysteresis (100mV typ. for 2.9V threshold), MR input compatibility with 3.3V/5V logic, and SOT-23-5 package footprint constraints.
Technical Context
The TPS3840PL29DBVR implements a precision bandgap-referenced comparator with internal hysteresis to detect VDD falling below 2.9V (VIT−), asserting RESET low until VDD rises above VIT+ (2.9V + 100mV) and the programmed tD delay expires. Its glitch-immune MR input accepts logic-low pulses ≥300ns to force reset independently of VDD state.
Reset timing is governed by two independent delays: tSTRT (220µs typ.) initiates after VDD crosses VIT+, then tD (50µs–6.2s) extends assertion duration. The CT pin's 500kΩ internal resistance (RCT) and exponential RC time constant enable precise, temperature-stable delay programming without external components beyond the capacitor.
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 resistive dividers |
| Threshold Voltage (VIT−) | 2.9V ±1.5% max - factory-trimmed fixed threshold enabling accurate brownout detection at 2.9V |
| Supply Current (IDD) | 300nA typical, 700nA max - enables >10-year battery life in coin-cell–powered IoT endpoints |
| Startup Delay (tSTRT) | 220µs typical, 350µs max - ensures reliable reset assertion before MCU core voltage stabilizes |
| Reset Delay (tD) | 50µs (no cap) to 6.2s (10µF) - user-programmable via single external capacitor on CT pin |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling during slow-rising/falling VDD transitions |
| 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 height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low (≤200mV @ 2mA) or high (≥0.8×VDD) without external pull-up; sinks/source capability simplifies PCB layout |
| 2: VDD | Power input & monitored rail | Supplies internal circuitry while simultaneously serving as the voltage under supervision; bypass capacitor required |
| 3: GND | Reference ground | Common return path for VDD, MR, CT, and RESET; must be low-impedance connection to system ground plane |
| 4: MR | Manual reset input | Logic-low pulse ≥300ns forces immediate RESET assertion; internal 100kΩ pull-up allows floating when unused |
| 5: CT | Capacitor time-delay control | Connects to external capacitor (0–10µF) to set tD; floating = minimum 50µs delay; internal 500kΩ RCT sets RC time constant |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables multi-year operation from CR2032 batteries in wireless sensor nodes |
| Factory-trimmed 2.9V threshold | ±1.5% max accuracy over –40°C to +125°C eliminates need for external calibration or trimming |
| Programmable reset delay | Single external capacitor (0–10µF) sets tD from 50µs to 6.2s - no microcontroller firmware or external timers required |
| Glitch-immune MR input | Rejects transients <300ns, preventing spurious resets from ESD or digital noise on manual reset lines |
| Push-pull active-low output | Eliminates external pull-up resistor, reducing BOM count and board space vs. open-drain alternatives |
Applications
| Smart Meter Power Monitoring | Industrial Field Transmitter |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 9V auxiliary rail in ANSI C12.22-compliant electricity meters during cold-start and brownout events. IC Role / Device Role / Timing Role: Supervisor IC asserting RESET to hold MCU in reset until both rails stabilize above 2.9V and remain valid for ≥220µs. Use Value: Prevents corrupted flash writes and erratic UART communication during undervoltage conditions, meeting IEC 62056 reliability requirements. | Use Scenario: Embedded in 4–20mA loop-powered temperature/pressure transmitters deployed in hazardous Zone 1 areas. IC Role / Device Role / Timing Role: Detects VDD drop below 2.9V on isolated 5V DC-DC output; asserts RESET to halt analog front-end and ADC sampling. Use Value: Ensures safe fail-safe output (e.g., 3.6mA) during power faults, satisfying SIL-2 functional safety requirements per IEC 61508. |
| Fire Alarm Smoke Detector | Portable Medical Glucose Monitor |
Use Scenario: Powers supervisory function in EN54-certified standalone smoke detectors using dual AA alkaline cells (1.8V–3.2V). IC Role / Device Role / Timing Role: Threshold set to 2.9V triggers RESET when battery voltage decays below safe operating margin, initiating low-battery alert sequence. Use Value: Extends usable battery life by 18 months versus 1.8V-threshold supervisors, while guaranteeing end-of-life warning before critical failure. | Use Scenario: Supervises 3.0V LDO output powering BLE SoC and electrochemical sensor in FDA-cleared handheld glucose meters. IC Role / Device Role / Timing Role: Uses CT pin with 100nF capacitor to generate 62ms reset delay, ensuring stable ADC reference settling before measurement initiation. Use Value: Eliminates false "low battery" warnings caused by transient load-induced dips, improving patient compliance and diagnostic accuracy. |
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. 2.9V); identical package, pinout, and features | Requires redesign if system brownout threshold must be precisely 2.9V; suitable for 3.3V-only rail monitoring | Select when target undervoltage threshold aligns with 3.3V nominal supply |
| MAX6375XR29+T | 2.93V threshold, 1.2µA max IDD, SOT23-5, no programmable delay (fixed 200ms) | Lacks CT-based delay tuning; higher quiescent current reduces battery life in ultra-low-power designs | Choose only when fixed delay suffices and 300nA nano-power is not required |
Compared with TPS3840PL33DBVR, the TPS3840PL29DBVR provides tighter alignment to 2.9V brownout points in Li-ion–fed systems; versus MAX6375XR29+T, it delivers 4× lower supply current and field-adjustable reset timing-critical for energy-constrained edge devices.
Availability
TPS3840PL29DBVR is available at Aetrix Electronics and suitable for smart metering, industrial field transmitter, and fire safety equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3840PL29DBVR 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 targets ultra-low-power, high-voltage supervision in battery-operated and harsh-environment systems, emphasizing nanoscale quiescent current, wide input range, and flexible reset timing without external active components.
FAQ
What is the exact threshold voltage tolerance of the TPS3840PL29DBVR over temperature?
The TPS3840PL29DBVR has a fixed 2.9V negative-going input threshold (VIT−) with ±1.5% maximum accuracy across –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 100mV (typical) for thresholds between 1.6V and 3.0V. This is confirmed in Section 6.5 Electrical Characteristics of the TI datasheet SNVSB03E.
Can the TPS3840PL29DBVR monitor a 9V battery directly without external resistors?
Yes, the TPS3840PL29DBVR supports 1.5V to 10V VDD operation, enabling direct 9V battery monitoring without external voltage dividers. Its 2.9V threshold ensures reliable brownout detection as the battery discharges from 9V down to ~3.0V, and its 300nA supply current minimizes drain on primary cells.
How does the CT pin on the TPS3840PL29DBVR set the reset delay time?
The CT pin on the TPS3840PL29DBVR connects to an external capacitor (0–10µF) to ground, forming an RC network with its internal 500kΩ resistance (RCT). The resulting time constant determines reset delay (tD), ranging from 50µs (CT floating) to 6.2s (10µF). Equation 4 in the datasheet (tD = 618937 × CCT_EXT + 50µs) defines the relationship.
Is the TPS3840PL29DBVR pin-compatible with other TPS3840 variants like TPS3840PL33DBVR?
Yes, all TPS3840PLx variants-including TPS3840PL29DBVR and TPS3840PL33DBVR-share identical SOT-23-5 (DBV) packaging, pin configuration (RESET/VDD/GND/MR/CT), and electrical interface. Only the factory-set threshold voltage differs; no PCB layout changes are needed when substituting within the PL-series.
What is the minimum pulse width required on the MR pin to trigger reset in the TPS3840PL29DBVR?
The MR pin of the TPS3840PL29DBVR requires a logic-low pulse width of at least 300ns to reliably assert the RESET output. This specification is validated across –40°C to +125°C and ensures immunity to digital noise while supporting GPIO-driven reset initiation from common microcontrollers.
TPS3840PL29DBVR 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:
- 2.9V
- 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
TPS3840PL29DBVR FAQ
1.How can I place an order for TPS3840PL29DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL29DBVR 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 TPS3840PL29DBVR reliable?
The price and inventory of TPS3840PL29DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL29DBVR is usually 5 days.
3.What payment methods are accepted for TPS3840PL29DBVR?
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4.How is shipping managed for TPS3840PL29DBVR?
TPS3840PL29DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL29DBVR 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 TPS3840PL29DBVR?
For technical support, including TPS3840PL29DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL29DBVR requirements.
6.How does Aetrix verify that TPS3840PL29DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL29DBVR 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 TPS3840PL29DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL29DBVR?
All TPS3840PL29DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL29DBVR, 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 TPS3840PL29DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL29DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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