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Texas Instruments TPS3840PL18DBVR
- Part No.:
- TPS3840PL18DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL18DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,404
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Product details
Overview
TPS3840PL18DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 1.8 V fixed threshold (±1.5% max), 300 nA typical supply current, and programmable reset delay up to 6.2 s via external capacitor on CT pin. It monitors power rails in battery-powered industrial sensors and smart meters.
For engineers reviewing the TPS3840PL18DBVR datasheet, TPS3840PL18DBVR pinout, TPS3840PL18DBVR application, or TPS3840PL18DBVR equivalent, key selection criteria include its 1.5–10 V operating range, 220 µs startup delay, built-in hysteresis (100 mV typ. for 1.8 V threshold), MR input logic compatibility, and SOT-23-5 package footprint constraints.
Technical Context
The TPS3840PL18DBVR implements a precision bandgap-referenced comparator with internal hysteresis and glitch-immune VDD monitoring. Its reset assertion is triggered when VDD falls below 1.8 V (VIT−) or MR is pulled low, and release requires both VDD > VIT+ (1.9 V) and expiration of the programmable tD delay.
It features a dedicated CT pin with 500 kΩ internal resistance enabling precise RC-based timing (50 µs to 6.2 s), integrated MR pull-up (100 kΩ), and push-pull output capable of sinking 2 mA at VOL ≤ 200 mV - eliminating need for external pull-up resistors unlike open-drain variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 10 V - supports direct monitoring of 3.3 V, 5 V, and 9 V rails without divider resistors |
| Threshold Voltage (VIT−) | 1.8 V ±1.5% max - factory-trimmed fixed threshold for reliable 1.8 V system power-on detection |
| Supply Current (IDD) | 300 nA typical, 700 nA max - enables multi-year battery life in always-on IoT endpoints |
| Startup Delay (tSTRT) | 220 µs typical - ensures reset assertion before MCU core voltage stabilizes during cold start |
| Reset Delay Range (tD) | 50 µs (CT floating) to 6.2 s (10 µF) - configurable timing for sequenced power-up or fault hold-off |
| Output Type | Push-pull active-low - drives RESET low directly; no external pull-up required, compatible with standard logic inputs |
| Operating Temperature | –40°C to +125°C - qualified for industrial and grid infrastructure environments |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, 5-pin surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Asserts logic low during fault or MR event; sinks 2 mA at ≤200 mV - interfaces directly with MCU reset input |
| 2: VDD | Power supply and monitored rail input | Supplies internal circuitry and serves as monitored voltage source; accepts 1.5–10 V with no external components |
| 3: GND | Ground reference | Common return path for internal comparator, output driver, and MR/CT bias networks |
| 4: MR | Manual reset input | Pull low ≥300 ns to force reset; internally pulled up to ~VDD via 100 kΩ - compatible with 1.8 V/3.3 V GPIO |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor to GND to set tD; 500 kΩ internal RCT enables predictable RC timing from 50 µs to 6.2 s |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 300 nA typical IDD extends battery life in portable and remote sensor nodes beyond 10 years |
| Programmable reset delay | External capacitor on CT pin sets tD from 50 µs to 6.2 s - eliminates need for external timers or firmware delays |
| High-accuracy threshold | 1.8 V threshold with ±1.5% max error over –40°C to +125°C ensures reliable brownout detection across temperature |
| Built-in hysteresis | 100 mV typical hysteresis (VIT+) prevents chatter during slow-rising/falling VDD transitions near threshold |
| Glitch-immune MR and VDD inputs | 10 µs minimum pulse rejection on MR and 5% overdrive immunity on VDD suppress noise-induced false resets |
Applications
| Smart Meter Power Monitoring | Industrial Field Transmitter |
|---|---|
Use Scenario: Monitors backup battery and main AC/DC supply in ANSI C12.20-compliant electricity meters during grid outages and brownouts. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to microcontroller when VDD drops below 1.8 V or MR is triggered by metering ASIC. Use Value: Prevents corrupted flash writes and invalid energy measurements during unstable supply conditions using 100 mV hysteresis and 220 µs fast startup. | Use Scenario: Ensures safe boot and fault recovery in 4–20 mA loop-powered temperature/pressure transmitters deployed in hazardous factory zones. IC Role / Device Role / Timing Role: Resets analog front-end and Cortex-M0+ MCU upon undervoltage or manual maintenance trigger, with 50 µs–6.2 s configurable hold time. Use Value: Guarantees clean power-up sequencing and sustained reset during transient EMI events via glitch-immune VDD/MR inputs and nano-power operation. |
| Fire Alarm Smoke Detector | Portable Medical Sensor |
Use Scenario: Supervises primary lithium battery and charging circuit in UL 217-certified smoke alarms with 10-year battery life requirement. IC Role / Device Role / Timing Role: Detects VDD < 1.8 V during battery depletion or short-circuit fault, holding RESET low until replacement or recovery. Use Value: Enables ultra-low IDD (300 nA) to preserve battery capacity while maintaining accurate 1.8 V threshold detection across –40°C to +125°C. | Use Scenario: Manages power integrity in Bluetooth LE-enabled wearable ECG patches powered by coin-cell batteries. IC Role / Device Role / Timing Role: Generates controlled reset pulse after battery insertion or low-VDD condition, with CT-programmed 100 ms delay to stabilize LDO before MCU wake-up. Use Value: Eliminates external timing components and reduces BOM count while ensuring deterministic reset behavior under variable load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL25DBVR | Fixed 2.5 V threshold (vs. 1.8 V); identical package, pinout, and timing specs | Targets 2.5 V I/O domains or higher-voltage microcontrollers; not suitable for 1.8 V core logic supervision | Select only if system VDD nominal is ≥2.5 V and threshold alignment is critical |
| MAX6371UKT18+T | 1.8 V threshold, 1.1 µA max IDD, SC70-5 package, no programmable CT pin | Lacks user-adjustable reset delay; fixed 140 ms tD; higher quiescent current limits battery lifetime | Choose when board space is constrained (SC70 vs. SOT-23) and fixed delay suffices |
Compared with TPS3840PL18DBVR, TPS3840PL25DBVR offers identical functionality at a different threshold, while MAX6371UKT18+T trades programmability and ultra-low current for smaller footprint - making TPS3840PL18DBVR optimal for 1.8 V systems requiring long battery life and flexible reset timing.
Availability
TPS3840PL18DBVR is available at Aetrix Electronics and suitable for smart metering, industrial field transmitters, fire safety systems, and portable medical sensors requiring stable component supply across extended temperature ranges and multi-year deployment cycles.
Supply support for TPS3840PL18DBVR 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 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 glitch immunity.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL18DBVR?
The TPS3840PL18DBVR has a factory-set negative-going input threshold (VIT−) of 1.8 V with ±1.5% maximum accuracy over –40°C to +125°C and 1% typical accuracy at 25°C. Hysteresis is 100 mV typical, yielding a VIT+ of 1.9 V - ensuring stable reset release without oscillation during slow-rising supply conditions. This specification is confirmed in Section 6.5 of the official TI datasheet SNVSB03E.
Does the TPS3840PL18DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PL18DBVR uses a push-pull active-low output architecture, so the RESET pin actively drives low during assertion and high during release - no external pull-up resistor is needed. This differs from the TPS3840DL variant, which requires a pull-up. The push-pull design simplifies layout and reduces component count in space-constrained designs using the TPS3840PL18DBVR.
How is the reset time delay programmed on the TPS3840PL18DBVR?
The reset time delay (tD) on the TPS3840PL18DBVR is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, tD is 50 µs minimum; with a 10 µF capacitor, tD reaches 6.2 s maximum. The timing follows tD = 618937 × CCT_EXT + 50 µs, where CCT_EXT is in farads - enabling precise, repeatable delay tuning without firmware involvement for the TPS3840PL18DBVR.
What is the minimum pulse width required on the MR pin to trigger reset in the TPS3840PL18DBVR?
The TPS3840PL18DBVR requires a minimum MR low pulse width of 300 ns to reliably initiate reset assertion, as specified in Section 6.6 (tMR_PW). This short pulse requirement allows compatibility with fast GPIOs and digital logic families. The MR pin features an internal 100 kΩ pull-up, so it may be left unconnected when manual reset is unused - simplifying design for the TPS3840PL18DBVR in systems without external reset control.
Can the TPS3840PL18DBVR monitor a 9 V battery directly without external resistive dividers?
Yes, the TPS3840PL18DBVR supports direct monitoring of 9 V batteries because its VDD input operates from 1.5 V to 10 V - covering the full discharge curve of alkaline or lithium primary cells. No external resistive divider is needed, preserving power efficiency and measurement accuracy. This capability is explicitly stated in the device description and validated across recommended operating conditions for the TPS3840PL18DBVR.
TPS3840PL18DBVR 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:
- 1.8V
- 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
TPS3840PL18DBVR FAQ
1.How can I place an order for TPS3840PL18DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL18DBVR 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 TPS3840PL18DBVR reliable?
The price and inventory of TPS3840PL18DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL18DBVR is usually 5 days.
3.What payment methods are accepted for TPS3840PL18DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3840PL18DBVR transactions.
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4.How is shipping managed for TPS3840PL18DBVR?
TPS3840PL18DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL18DBVR 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 TPS3840PL18DBVR?
For technical support, including TPS3840PL18DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL18DBVR requirements.
6.How does Aetrix verify that TPS3840PL18DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL18DBVR 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 TPS3840PL18DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL18DBVR?
All TPS3840PL18DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL18DBVR, 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 TPS3840PL18DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL18DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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