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Texas Instruments TPS3840PL28DBVR
- Part No.:
- TPS3840PL28DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL28DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,370
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Product details
Overview
TPS3840PL28DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, fixed 2.8V threshold (±1.5% max), 300nA typical supply current, and user-programmable reset delay via external capacitor on CT pin. It monitors VDD rails up to 10V in battery-powered or industrial systems requiring precise power-on-reset and glitch-immune fault detection.
For engineers reviewing the TPS3840PL28DBVR datasheet, TPS3840PL28DBVR pinout, TPS3840PL28DBVR application, or TPS3840PL28DBVR equivalent, key selection criteria include its 2.8V detection accuracy, 220µs startup delay, programmable 50µs–6.2s reset timeout, –40°C to +125°C operation, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The TPS3840PL28DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100mV typical for 2.8V threshold) 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 the reset delay, decoupled from VDD supply variations.
Reset assertion occurs when VDD falls below 2.8V or MR is pulled low; deassertion requires VDD to rise above 2.9V (2.8V + 100mV hysteresis) *and* expiration of the programmed tD delay. The push-pull output drives RESET low actively (200mV max VOL at 2mA sink) without requiring an external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10V - supports direct monitoring of 3.3V, 5V, 9V battery or rail without divider resistors |
| Threshold Voltage (VIT−) | 2.8V ±1.5% max - factory-trimmed fixed threshold enabling accurate brownout detection |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on IoT sensors and portable equipment |
| Startup Delay (tSTRT) | 220µs typical - ensures reliable reset assertion before system MCU initializes during power-up |
| Reset Delay Range (tD) | 50µs (CT open) to 6.2s (10µF) - enables flexible timeout tuning for diverse firmware boot sequences |
| Operating Temperature | –40°C to +125°C - qualified for industrial control, smart metering, and automotive under-hood auxiliary circuits |
| Hysteresis (VHYS) | 100mV typical - prevents oscillatory reset toggling near threshold during slow-rising/falling VDD transitions |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives logic-low reset signal directly; no external pull-up required; sinks 2mA min at 200mV VOL |
| 2: VDD | Power input & monitored rail | Supplies internal circuitry *and* serves as voltage sense node; accepts 1.5–10V input |
| 3: GND | Reference ground | Common return path for VDD, MR, CT, and RESET; must be low-impedance for noise immunity |
| 4: MR | Manual reset input | Active-low asynchronous trigger; 600mV max VMR_L; internal 100kΩ pull-up allows floating use |
| 5: CT | Capacitor timing input | Connects to external capacitor for programmable tD; 500kΩ internal RCT sets RC time constant |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables >10-year battery life in coin-cell–powered smoke detectors |
| Programmable reset delay | External capacitor on CT pin sets tD from 50µs to 6.2s - eliminates need for external timers or microcontroller polling |
| High-accuracy threshold | 2.8V ±1.5% over –40°C to +125°C - reduces design margin requirements vs. discrete resistor-divider solutions |
| Glitch-immune inputs | VDD and MR tolerate transients ≥10µs at 5% overdrive - prevents false resets in electrically noisy factory automation environments |
| Push-pull active-low output | No external pull-up needed - simplifies BOM, improves noise immunity, and ensures fast VOL rise/fall times |
Applications
| Smart Meter Power Monitoring | Industrial PLC Field Transmitter |
|---|---|
Use Scenario: Continuous monitoring of 3.3V or 5V supply in ANSI C12.22–compliant electricity meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to microcontroller upon brownout or surge-induced VDD dip. Use Value: 100mV hysteresis prevents chatter during grid voltage sags; 125°C rating ensures reliability inside sealed meter enclosures. | Use Scenario: Power sequencing and fault detection in 4–20mA loop-powered field transmitters operating in hazardous chemical plant zones. IC Role / Device Role / Timing Role: Primary voltage monitor triggering hardware reset if 24V loop supply drops below safe operating level. Use Value: 10V max VDD rating allows direct connection to unregulated 24V rails; nano-IQ minimizes loop current burden. |
| Fire Alarm Smoke Detector | Portable Medical Diagnostic Device |
Use Scenario: Battery-backed smoke detector with self-test and low-battery warning, requiring decade-long shelf life. IC Role / Device Role / Timing Role: Supervises 3V lithium primary cell; asserts RESET if voltage falls below 2.8V during alarm activation or aging. Use Value: 300nA IDD extends battery service life beyond 10 years; VPOR = 300mV prevents false wake-up during cold-start. | Use Scenario: Handheld ECG or glucose meter powered by two AAA alkaline cells (3V nominal), needing robust power-up sequencing. IC Role / Device Role / Timing Role: Ensures microcontroller remains held in reset until regulated 3.3V rail stabilizes post-battery insertion. Use Value: 220µs tSTRT guarantees reset assertion before CPU clock initialization; 2.8V threshold matches battery end-of-life voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL30DBVR | Fixed 3.0V threshold (vs. 2.8V); identical package, pinout, and electrical specs otherwise | Suitable where system brownout threshold is set at 3.0V instead of 2.8V - e.g., 3.3V LDO with 3% tolerance | Select when exact 3.0V detection is required; no layout or firmware changes needed |
| MAX6326UT29D3+T | 2.93V threshold, 1.2µA max IDD, SOT23-5, push-pull active-low - higher quiescent current, tighter 2.5% threshold accuracy | Better suited for applications prioritizing threshold precision over ultra-low power - e.g., lab-grade instrumentation | Choose when <2.5% VIT− tolerance is mandatory and 1.2µA IQ is acceptable |
Compared with TPS3840PL28DBVR, TPS3840PL30DBVR offers identical functionality at a different threshold, while MAX6326UT29D3+T trades nano-power efficiency for enhanced threshold accuracy - guiding selection based on whether battery life or voltage tolerance is the dominant constraint.
Availability
TPS3840PL28DBVR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, fire safety systems, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3840PL28DBVR 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 technologies for industrial, automotive, and consumer applications.
The TPS3840 family is designed for ultra-low-power voltage supervision in battery-critical and harsh-environment systems - emphasizing nanoscale quiescent current, wide input voltage range, and programmable timing without external logic.
FAQ
What is the exact threshold voltage of the TPS3840PL28DBVR?
The TPS3840PL28DBVR has a factory-trimmed fixed negative-going input threshold (VIT−) of 2.8V, with accuracy of ±1.5% maximum over –40°C to +125°C. This value is laser-trimmed during production and does not require external resistor networks - ensuring consistent brownout detection across all units of TPS3840PL28DBVR without calibration.
How do I configure the reset delay time for the TPS3840PL28DBVR?
To configure the reset delay time for the TPS3840PL28DBVR, connect an external capacitor between the CT pin (Pin 5) and GND. With no capacitor (CT floating), tD = 50µs minimum. A 100nF capacitor yields ~62ms; 1µF yields ~619ms; and 10µF yields up to 6.2s. The relationship follows tD ≈ 618937 × CCT_EXT + 50µs, using the device's internal 500kΩ CT resistor.
Does the TPS3840PL28DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PL28DBVR does not require an external pull-up resistor on the RESET pin because it features a push-pull active-low output topology. Pin 1 (RESET) actively drives low during reset assertion and actively drives high (to VDD) when released - eliminating pull-up components, reducing BOM count, and improving noise immunity compared to open-drain alternatives like TPS3840DL28DBVR.
What is the manual reset (MR) input behavior of the TPS3840PL28DBVR?
The MR pin (Pin 4) of the TPS3840PL28DBVR is an active-low, internally pulled-up (100kΩ) input. Pulling MR below 600mV (VMR_L) for ≥300ns asserts RESET immediately. When MR returns high (>0.7×VDD), RESET remains asserted for the full programmed tD delay before releasing - enabling synchronized system reset after processor-initiated recovery sequences in the TPS3840PL28DBVR.
Can the TPS3840PL28DBVR monitor a 9V battery directly?
Yes, the TPS3840PL28DBVR can monitor a 9V battery directly because its VDD input supports 1.5V to 10V operation - covering the full discharge curve of a standard 9V alkaline battery (9.6V fresh down to ~4.5V). No external voltage divider is needed, preserving the 2.8V detection point and avoiding resistor tolerance errors that would affect threshold accuracy in the TPS3840PL28DBVR.
TPS3840PL28DBVR 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.8V
- 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
TPS3840PL28DBVR FAQ
1.How can I place an order for TPS3840PL28DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL28DBVR 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 TPS3840PL28DBVR reliable?
The price and inventory of TPS3840PL28DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL28DBVR is usually 5 days.
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4.How is shipping managed for TPS3840PL28DBVR?
TPS3840PL28DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL28DBVR 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 TPS3840PL28DBVR?
For technical support, including TPS3840PL28DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL28DBVR requirements.
6.How does Aetrix verify that TPS3840PL28DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL28DBVR 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 TPS3840PL28DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL28DBVR?
All TPS3840PL28DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL28DBVR, 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 TPS3840PL28DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL28DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS3840PL28DBVR Tags
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