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Texas Instruments TPS3840PH45DBVR
- Part No.:
- TPS3840PH45DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PH45DBVR.pdf
- Description:
- IC POWER
- Quantity:
- Payment:
- Shipping:
Inventory:5,735
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Product details
Overview
TPS3840PH45DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-high reset output, 4.5 V fixed threshold (±1.5% max), 300 nA typical supply current, and user-programmable reset delay up to 6.2 s via external capacitor on CT pin - used for reliable power-on-reset and brownout detection in battery-powered industrial sensors.
For engineers reviewing the TPS3840PH45DBVR datasheet, TPS3840PH45DBVR pinout, TPS3840PH45DBVR application, or TPS3840PH45DBVR equivalent, key selection criteria include its 1.5–10 V operating range, 220 µs startup delay, built-in hysteresis (200 mV typ. for 4.5 V threshold), –40°C to +125°C operation, and SOT-23-5 (DBV) package compatibility with space-constrained PCB layouts.
Technical Context
The TPS3840PH45DBVR implements a precision bandgap-referenced comparator with internal hysteresis to monitor VDD against a factory-trimmed 4.5 V negative-going threshold (VIT−). Its active-high push-pull RESET output eliminates need for external pull-up resistors and supports direct interface with microcontroller reset inputs requiring high-true assertion.
Reset timing is governed by two independent delays: a fixed 220 µs (typ.) startup delay (tSTRT) after VDD exceeds VIT+, and a programmable reset hold time (tD) set by an external capacitor on the CT pin - enabling precise control over system initialization sequencing without firmware intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 10 V - enables direct monitoring of 3.3 V, 5 V, and 9 V rails without external divider resistors. |
| Threshold Voltage (VIT−) | 4.5 V ±1.5% (max) - factory-trimmed accuracy ensures consistent brownout detection across temperature and voltage. |
| Quiescent Current (IDD) | 300 nA (typ.), 700 nA (max) - extends battery life in always-on IoT sensors and portable meters. |
| Startup Delay (tSTRT) | 220 µs (typ.), 350 µs (max) - guarantees reset assertion before main system logic powers up during cold start. |
| Reset Time Delay (tD) | 50 µs (no cap) to 6.2 s (10 µF) - configurable via CT-to-GND capacitor for flexible system boot timing. |
| Hysteresis (VHYS) | 200 mV (typ.) - prevents oscillatory reset toggling during slow-rising or noisy supply transitions near threshold. |
| Operating Temperature | –40°C to +125°C - qualified for harsh environments including smart metering, PLC I/O modules, and HVAC controls. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, 5-pin plastic case with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high push-pull output | Drives logic-high during fault; sinks current when deasserted; no external pull-up required. |
| 2: VDD | Power input & monitored rail | Supplies internal circuitry and serves as the voltage being supervised; accepts 1.5–10 V directly. |
| 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 | Logic-low pulse ≥300 ns asserts RESET; floating or >0.7×VDD releases RESET after tD expires. |
| 5: CT | Capacitor time-delay programming | Connects to GND via external capacitor (0–10 µF) to set reset hold time; left open for 50 µs minimum delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300 nA typical supply current enables >10-year battery life in coin-cell–powered smoke detectors. |
| Programmable reset delay | 50 µs to 6.2 s via single external capacitor - replaces firmware-based timing and simplifies BOM. |
| Push-pull active-high RESET | Eliminates external pull-up resistor and reduces board area vs. open-drain alternatives like TPS3840DL45DBVR. |
| Built-in glitch immunity | Rejects VDD transients <10 µs at 5% overdrive - prevents false resets in electrically noisy factory automation settings. |
| Factory-trimmed 4.5 V threshold | ±1.5% max accuracy over –40°C to +125°C - removes need for calibration in grid infrastructure monitoring equipment. |
Applications
| Smart Meter Power Monitoring | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Monitors 3.3 V or 5 V MCU supply in ANSI C12.22-compliant electricity meters during grid voltage sags. IC Role / Device Role / Timing Role: Asserts active-high RESET to halt metering firmware and preserve flash integrity when VDD drops below 4.5 V. Use Value: Prevents corrupted energy accumulation data during brownouts by enforcing clean restart after stable 4.5 V restoration plus 200 ms tD. |
Use Scenario: Supervises isolated 24 V DC-to-5 V converter output powering analog input channel ASICs in DIN-rail PLCs. IC Role / Device Role / Timing Role: Generates controlled reset pulse to synchronize ADC initialization and digital isolator handshake. Use Value: Eliminates spurious I/O faults during field transmitter hot-swap by guaranteeing 220 µs tSTRT + programmable tD before enabling signal chain. |
| Fire Alarm Sensor Node | Portable Battery-Powered Data Logger |
Use Scenario: Powers continuous self-test circuitry in UL 217-listed smoke detectors using CR123A primary cells. IC Role / Device Role / Timing Role: Detects end-of-life battery drop below 4.5 V and triggers audible/visual alert via RESET-driven latch. Use Value: Achieves >7-year shelf life with 300 nA IDD while maintaining certified fault response time per NFPA 72 requirements. |
Use Scenario: Manages power sequencing in handheld environmental loggers powered by two AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Holds MCU in reset until battery voltage stabilizes above 4.5 V after cold start or load transient. Use Value: Avoids brownout lockup during sensor wake-up bursts by combining 200 mV hysteresis with 1 s tD for robust voltage recovery margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL45DBVR | Push-pull active-low RESET output; identical threshold, supply current, and timing specs. | Requires MCU reset pin compatible with active-low assertion; may simplify interface with legacy controllers. | Select when host processor expects active-low reset signal and board layout already includes pull-down or level-shifting logic. |
| TPS3840DL45DBVR | Open-drain active-low RESET; requires external pull-up resistor; 90 nA leakage (max) at 5.5 V. | Enables wired-OR reset bus sharing across multiple supervisors; higher flexibility in multi-rail systems. | Choose when implementing shared reset busing or interfacing with 1.8 V logic domains requiring level translation. |
Compared with TPS3840PL45DBVR and TPS3840DL45DBVR, the TPS3840PH45DBVR provides direct active-high drive capability - reducing component count and eliminating pull-up resistor tolerance effects on reset timing accuracy in new designs targeting simplified power management.
Availability
TPS3840PH45DBVR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, fire safety sensors, and portable battery-powered data loggers requiring stable component supply and long-term manufacturability.
Supply support for TPS3840PH45DBVR 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, with over 90 years of innovation in power management, signal chain, and industrial ICs.
The TPS3840 family was designed specifically for ultra-low-power, high-voltage supervision in mission-critical infrastructure - addressing needs in grid monitoring, factory automation, and building safety where reliability, accuracy, and longevity are non-negotiable.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PH45DBVR?
The TPS3840PH45DBVR has a factory-set negative-going input threshold (VIT−) of 4.5 V with ±1.5% maximum deviation over –40°C to +125°C and 1.5 V to 10 V supply range. Typical accuracy is ±1%, verified across production lots and documented in Section 6.5 of the official TI datasheet SNVSB03E.
Does the TPS3840PH45DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PH45DBVR features a push-pull active-high RESET output that actively drives high and sinks current when low - eliminating the need for an external pull-up resistor. This reduces BOM cost and improves timing predictability compared to open-drain variants like TPS3840DL45DBVR.
How is the reset time delay programmed on the TPS3840PH45DBVR?
The reset time delay (tD) of the TPS3840PH45DBVR is set by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50 µs (min); with 10 µF, tD ≈ 6.2 s (max). The relationship follows tD = 618937 × CCT_EXT + 50 µs, where CCT_EXT is in farads - per Equation 4 in TI's datasheet SNVSB03E.
What is the startup delay behavior of the TPS3840PH45DBVR during power-up?
The TPS3840PH45DBVR asserts RESET immediately if VDD starts below VPOR (950 mV), then holds RESET asserted for a fixed 220 µs (typical) startup delay (tSTRT) after VDD rises above VIT+ (4.7 V, given 200 mV hysteresis). This ensures deterministic release timing before downstream logic begins operation.
Can the TPS3840PH45DBVR monitor a 24 V supply directly?
No - the TPS3840PH45DBVR absolute maximum VDD rating is 12 V, and recommended operating range is 1.5 V to 10 V. To supervise a 24 V rail, use an external resistor divider to scale the voltage down to ≤10 V at the VDD pin, ensuring the divided signal maintains sufficient noise margin and meets the 300 nA input current requirement.
TPS3840PH45DBVR 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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PH45DBVR FAQ
1.How can I place an order for TPS3840PH45DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PH45DBVR 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 TPS3840PH45DBVR reliable?
The price and inventory of TPS3840PH45DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PH45DBVR is usually 5 days.
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Once your TPS3840PH45DBVR 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 TPS3840PH45DBVR?
For technical support, including TPS3840PH45DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PH45DBVR requirements.
6.How does Aetrix verify that TPS3840PH45DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PH45DBVR 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 TPS3840PH45DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PH45DBVR?
All TPS3840PH45DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PH45DBVR, 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 TPS3840PH45DBVR part is unused and in its original packaging.
Return procedure for TPS3840PH45DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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