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Texas Instruments TPS3840PL40DBVR
- Part No.:
- TPS3840PL40DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL40DBVR.pdf
- Description:
- NANOPOWER HIGH-INPUT VOLTAGE SUP
- Quantity:
- Payment:
- Shipping:
Inventory:2,632
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Product details
Overview
TPS3840PL40DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 4.0V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay (50µs to 6.2s via external capacitor). It monitors 1.5V–10V rails in battery-powered safety-critical systems such as smoke detectors and smart meters.
For engineers reviewing the TPS3840PL40DBVR datasheet, TPS3840PL40DBVR pinout, TPS3840PL40DBVR application, or TPS3840PL40DBVR equivalent, key selection criteria include its 4.0V VIT− accuracy, 220µs startup delay, SOT-23-5 package compatibility, and MR/CT pin configurability for manual reset and timing control.
Technical Context
The TPS3840PL40DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis (200mV typical for 4.0V threshold) and glitch-immune input sensing. Its internal CT pin resistor (500kΩ typical) forms an RC time constant with an external capacitor to generate user-defined reset hold times.
It operates across –40°C to +125°C with VPOR = 300mV and supports fast fault detection via 30µs propagation delay (tP_HL) when VDD falls below VIT−. The push-pull output drives RESET low with 200mV VOL at 2mA sink, eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.0V ±1.5% max - ensures reliable brownout detection on 3.3V/5V systems with margin against noise-induced false resets |
| IDD Supply Current | 300nA typical - extends battery life in always-on monitoring applications like fire alarms and portable medical devices |
| tSTRT Startup Delay | 220µs typical - enables early fault detection before system power-up completes, critical for hazardous start-up conditions |
| tD Reset Delay Range | 50µs (no cap) to 6.2s (10µF) - configurable hold time prevents premature MCU wake-up during unstable power recovery |
| VHYS Hysteresis | 200mV typical - suppresses oscillation during slow-rising/falling VDD transitions near threshold |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments without derating |
| Output Type | Push-pull active-low - delivers rail-to-rail logic levels without external components, simplifying PCB layout |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, thermally enhanced for high-reliability industrial use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low (≤200mV @ 2mA) during fault; releases high (≥0.8×VDD) after tD expires - no pull-up required |
| 2: VDD | Supply and monitored rail input | Accepts 1.5V–10V; powers internal circuitry and serves as voltage reference point for threshold comparison |
| 3: GND | Ground reference | Common return path for VDD, MR, and CT; must be low-impedance to maintain noise immunity |
| 4: MR | Manual reset input | Asserts RESET low when pulled ≤600mV; floating or ≥0.7×VDD releases reset - compatible with 1.8V/3.3V GPIO |
| 5: CT | Capacitor time-delay programming | Connects to GND via external capacitor (0–10µF) to set tD; left open for minimum 50µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 300nA typical - reduces standby power by >90% vs. legacy supervisors, enabling multi-year battery operation |
| Programmable reset delay | 50µs–6.2s via single capacitor - eliminates need for external timers or microcontroller intervention |
| High-accuracy threshold | ±1.5% max over temperature - ensures consistent trip point across –40°C to +125°C without calibration |
| Glitch-immune VDD sensing | 10µs immunity to 5% overdrive transients - rejects EMI-induced spikes that could trigger spurious resets |
| Wide input voltage range | 1.5V–10V - monitors 3.3V, 5V, and 9V rails directly; supports 24V rails with external resistor divider |
Applications
| Smart Meter Power Monitoring | Fire Alarm Sensor Node |
|---|---|
|
Use Scenario: Monitors backup battery and main AC-derived rail in utility smart meters to detect brownouts during grid instability. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to microcontroller upon VDD drop below 4.0V, with 200ms programmable hold time. Use Value: Prevents corrupted firmware writes during power collapse; 300nA IDD extends 10-year lithium battery life. |
Use Scenario: Ensures reliable power-on initialization and fault response in standalone smoke detector modules powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Voltage supervisor triggering MCU reset if battery voltage decays below 4.0V; MR pin enables test-button reset. Use Value: 220µs tSTRT detects faults before MCU executes code; 125°C rating supports enclosed plastic enclosures. |
| Industrial PLC Field Transmitter | Electronic Point-of-Sale Terminal |
|
Use Scenario: Provides fail-safe reset for 4–20mA loop-powered field transmitters operating from 9–36V supplies in factory automation. IC Role / Device Role / Timing Role: High-voltage supervisor monitoring local 5V LDO output; CT pin sets 1s reset delay to stabilize analog front-end after power recovery. Use Value: 10V absolute max rating tolerates 24V rail transients; 200mV hysteresis prevents chatter during slow power ramp-up. |
Use Scenario: Guarantees clean boot sequence in retail POS terminals using coin-cell backup during main power interruptions. IC Role / Device Role / Timing Role: Nano-power supervisor asserting RESET during 3.3V rail collapse; MR pin allows cashier-initiated soft reset. Use Value: 4.0V VIT− aligns with 3.3V system margin; 300nA IDD preserves backup energy for >5 years of standby. |
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. 4.0V); identical pinout, specs, and features | Used where system brownout threshold must align with 3.3V logic rail instead of 4.0V battery cutoff | Select when VIT− must match 3.3V nominal supply rather than 4.0V battery end-of-life voltage |
| MAX6374US40+T | 4.0V threshold, but 1.6µA IDD (5× higher), SOT23-6 package, no MR pin | Lacks manual reset and nano-power efficiency; suited for non-battery applications with less stringent current budget | Choose only if MR functionality and sub-1µA quiescent current are not required |
Compared with TPS3840PL40DBVR, TPS3840PL33DBVR offers identical performance at a lower threshold for 3.3V systems, while MAX6374US40+T trades nano-power operation and MR flexibility for legacy compatibility in cost-sensitive, non-portable designs.
Availability
TPS3840PL40DBVR is available at Aetrix Electronics and suitable for smart metering, fire safety systems, industrial PLCs, and electronic point-of-sale terminals requiring stable component supply and long-term industrial lifecycle support.
Supply support for TPS3840PL40DBVR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial ICs.
The TPS3840 family was designed specifically for ultra-low-power voltage supervision in battery-backed and energy-constrained systems, emphasizing nanoscale quiescent current, wide input voltage tolerance, and robust fault detection timing.
FAQ
What is the exact threshold voltage of the TPS3840PL40DBVR?
The TPS3840PL40DBVR has a factory-trimmed negative-going input threshold (VIT−) of 4.0V, with accuracy of ±1.5% maximum over –40°C to +125°C. This value is fixed and non-adjustable; it is confirmed in TI's official datasheet Section 6.5 Electrical Characteristics and Device Nomenclature Figure 4-1.
Does the TPS3840PL40DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PL40DBVR uses a push-pull active-low output architecture, so the RESET pin actively drives low during fault and high during normal operation. Unlike open-drain variants (e.g., TPS3840DL40DBVR), it does not require an external pull-up resistor - simplifying BOM and layout.
How is the reset time delay programmed on the TPS3840PL40DBVR?
The reset time delay (tD) of the TPS3840PL40DBVR is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50µs; with 10µF, tD ≈ 6.2s. The relationship follows tD = 618937 × CCT_EXT + 50µs, per datasheet Equation 4.
Can the TPS3840PL40DBVR monitor a 24V rail directly?
No - the TPS3840PL40DBVR has a 10V absolute maximum VDD rating. To monitor a 24V rail, use an external resistor divider to scale the voltage down to ≤10V at the VDD pin, ensuring the divided signal remains within 1.5V–10V operating range and meets accuracy requirements per datasheet Section 3 Description.
What is the manual reset (MR) input behavior of the TPS3840PL40DBVR?
The MR pin of the TPS3840PL40DBVR asserts RESET low when pulled ≤600mV (VMR_L). It releases RESET after VDD rises above VIT+ and the programmed tD expires - provided MR is floating or ≥0.7×VDD (VMR_H). Pulse width must exceed 300ns to guarantee reset assertion.
TPS3840PL40DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- 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
TPS3840PL40DBVR FAQ
1.How can I place an order for TPS3840PL40DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL40DBVR 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 TPS3840PL40DBVR reliable?
The price and inventory of TPS3840PL40DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL40DBVR is usually 5 days.
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4.How is shipping managed for TPS3840PL40DBVR?
TPS3840PL40DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL40DBVR 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 TPS3840PL40DBVR?
For technical support, including TPS3840PL40DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL40DBVR requirements.
6.How does Aetrix verify that TPS3840PL40DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL40DBVR 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 TPS3840PL40DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL40DBVR?
All TPS3840PL40DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL40DBVR, 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 TPS3840PL40DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL40DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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