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Texas Instruments TPS3824-33DBVR
- Part No.:
- TPS3824-33DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3824-33DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,021
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Product details
Overview
TPS3824-33DBVR from Texas Instruments is a 3.3V fixed-threshold voltage supervisor IC with integrated watchdog timer, active-high and active-low reset outputs, and manual reset input - designed for reliable power-on reset and system supervision in microcontroller-based applications. It features 200ms reset delay, 1.6s watchdog timeout, 2.93V threshold (±2%), 15μA supply current, and operates across −40°C to 85°C.
For engineers reviewing the TPS3824-33DBVR datasheet, TPS3824-33DBVR pinout, TPS3824-33DBVR application, or TPS3824-33DBVR equivalent, key selection criteria include dual-reset output logic, watchdog timer compatibility with MSP430/ARM Cortex-M systems, SOT-23-5 footprint constraints, and precise 3.3V rail monitoring under noisy supply conditions.
Technical Context
The TPS3824-33DBVR implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50mV) to reject supply noise. Its dual-output structure provides simultaneous active-low (push-pull) and active-high (push-pull) RESET signals, enabling direct interface with both legacy and modern processors requiring complementary reset assertion.
Watchdog functionality relies on edge-triggered WDI input detection: a falling edge clears the 1.6s timeout counter, while absence of transitions triggers reset assertion. The MR pin supports asynchronous external reset initiation independent of VDD level or watchdog state, with internal 90kΩ pullup ensuring defined behavior when left unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1V to 5.5V - supports operation during brown-out and enables use with low-voltage MCUs before full rail stabilization |
| VIT− Threshold | 2.93V (nominal), ±2% over temperature - precisely matches 3.3V I/O rails with margin for hysteresis and noise rejection |
| Reset Delay (td) | 200ms (typical) - ensures sufficient time for power supply settling and clock stabilization before processor release |
| Watchdog Timeout (ttout) | 1.6s (typical) - provides robust fault detection window for firmware execution loops without excessive sensitivity to timing jitter |
| Supply Current (IDD) | 15μA (typical) - enables integration into battery-powered systems with multi-year standby life |
| Operating Temperature | −40°C to +85°C - qualified for industrial and commercial embedded environments without derating |
| Output Drive Type | Push-pull for both RESET and RESET - eliminates need for external pull-up resistors and supports fast rise/fall edges |
Pinout & Package
TPS3824-33DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 5) | Power supply input and monitored rail | Supplies device bias and serves as the primary voltage source under supervision; asserts reset if drops below 2.93V |
| GND (Pin 2) | Ground reference | Common return path for all internal circuitry and output drivers; must be low-impedance to ensure accurate threshold sensing |
| RESET (Pin 1) | Active-low push-pull reset output | Drives low during power-up, brown-out, or watchdog timeout; actively pulled high when inactive - no external pull-up required |
| RESET (Pin 3) | Active-high push-pull reset output | Complementary signal to Pin 1; asserts high during fault conditions - simplifies interface with processors requiring active-high reset |
| WDI (Pin 4) | Watchdog timer input | Falling-edge sensitive; must be toggled at least once per 1.6s to prevent reset; floats internally to avoid spurious timeouts if unused |
| MR (Pin - not present) | Not implemented | TPS3824-33DBVR excludes manual reset input; reset control is limited to VDD monitoring and WDI activity |
Key Features
| Feature | Design Value |
|---|---|
| Dual active reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate level-shifting components and support mixed-logic-system designs |
| Fixed 3.3V supervision threshold | 2.93V nominal with 50mV hysteresis ensures stable reset assertion/deassertion across temperature and supply ripple |
| 1.6s watchdog timeout | Longer timeout than TPS3820's 200ms enables robust detection of firmware hangs in complex real-time tasks without false triggers |
| 15μA ultra-low quiescent current | Enables continuous supervision in always-on subsystems such as RTC backup domains or sensor wake controllers |
| SOT-23-5 package | Standardized 5-pin footprint allows drop-in replacement with other TPS382x variants and simplifies layout reuse across voltage options |
Applications
| Microcontroller Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Ensuring clean boot sequence for ARM Cortex-M4 MCU after 3.3V rail stabilizes, while detecting firmware lockups via periodic WDI toggling. IC Role / Device Role / Timing Role: Primary power-on reset generator and runtime watchdog monitor; asserts dual RESET signals synchronously upon VDD breach or WDI timeout. Use Value: Prevents corrupted register states and undefined execution by guaranteeing minimum 200ms reset hold time and enforcing 1.6s firmware liveness check. | Use Scenario: Monitoring 3.3V logic supply in modular I/O card where field-replaceable modules require deterministic reset coordination during hot-swap events. IC Role / Device Role / Timing Role: System-level voltage supervisor with dual-output compatibility for both local FPGA configuration logic (active-high) and host controller interface (active-low). Use Value: Eliminates need for discrete inverters or dual supervisors, reducing BOM count and board area while maintaining fail-safe reset propagation. |
| Battery-Powered Wireless Sensor Node | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: Supervising 3.3V supply derived from low-quiescent DC/DC converter in LoRaWAN end-node operating on coin-cell battery. IC Role / Device Role / Timing Role: Low-power voltage monitor and watchdog enabler; uses 15μA IDD to extend battery life while ensuring MCU recovery from sleep-mode faults. Use Value: Achieves >5-year battery lifetime in periodic transmit mode by minimizing supervision overhead without sacrificing fault coverage. | Use Scenario: Providing redundant reset supervision for LIN transceiver and EEPROM interface in non-safety-critical BCM subassembly. IC Role / Device Role / Timing Role: Secondary supervisor complementing main system ASIC; monitors isolated 3.3V domain powering communication peripherals. Use Value: Adds layer of reliability against localized voltage droop or EMI-induced glitches that may escape primary supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33DBVR | Same 3.3V threshold and 200ms/1.6s timing, but only active-low RESET output; no RESET pin | Lacks active-high reset output - requires external inverter or logic adaptation for processors needing active-high assertion | Select when board space or cost constraints eliminate need for dual-output capability and system design accommodates single-reset polarity |
| TPS3824-30DBVR | Identical pinout and function, but 3.0V threshold (2.63V nominal); same 200ms delay and 1.6s watchdog | Designed for 3.0V logic rails - unsuitable for strict 3.3V systems due to 300mV threshold gap and potential early reset assertion | Choose only when supervising 3.0V supplies or when tighter threshold tolerance is required for marginal 3.3V designs with significant droop |
Compared with TPS3823-33DBVR, the TPS3824-33DBVR adds active-high reset capability without increasing footprint or power, enabling direct interface with newer MCUs; versus TPS3824-30DBVR, it delivers precise 3.3V rail alignment critical for systems with narrow VIH/VIL margins.
Availability
TPS3824-33DBVR is available at Aetrix Electronics and suitable for industrial automation, wireless sensor networks, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TPS3824-33DBVR 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 consumer applications.
The TPS382x product line was developed to provide compact, low-power voltage supervision with integrated watchdog functionality for resource-constrained microcontroller systems - emphasizing accuracy, reliability, and ease of integration in space-sensitive designs.
FAQ
What is the exact reset threshold voltage of the TPS3824-33DBVR and how does it vary with temperature?
The TPS3824-33DBVR has a nominal negative-going input threshold voltage (VIT−) of 2.93V, with guaranteed limits of 2.88V to 3.00V over −40°C to +85°C. Data sheet Figure 6-2 shows normalized threshold variation remains within ±0.2% across this range, confirming tight thermal stability essential for 3.3V rail monitoring in industrial environments.
Does the TPS3824-33DBVR include a manual reset (MR) input pin?
No, the TPS3824-33DBVR does not include a manual reset input. As confirmed in the Device Comparison Table and Pin Configuration section, MR functionality is present in TPS3820/3823/3825/3828 but omitted in TPS3824. Reset initiation is therefore limited to VDD monitoring and WDI watchdog events.
How does the watchdog timer in the TPS3824-33DBVR respond to WDI pin states?
The TPS3824-33DBVR watchdog timer resets its 1.6s counter on each detected falling edge at the WDI pin. If WDI remains static (high or low) beyond timeout, RESET asserts. When left floating, the device generates internal pulses to prevent false timeout - a behavior documented in Section 7.3.4 and validated in typical characteristics plots.
Can the TPS3824-33DBVR drive a 10kΩ pull-up load on its RESET output without performance degradation?
Yes - the TPS3824-33DBVR features push-pull outputs capable of sinking 3mA and sourcing 120µA (per Electrical Characteristics Table 6.5). Driving a 10kΩ pull-up to 3.3V requires only 330µA, well within the specified VOL/VOH performance envelope across temperature and voltage ranges.
What is the recommended bypass capacitor for the TPS3824-33DBVR VDD pin and why is it necessary?
A 0.1µF ceramic capacitor placed as close as possible to the VDD pin is recommended. This minimizes high-frequency noise coupling into the internal voltage reference and comparator, preventing false reset assertions - a requirement explicitly stated in the "Note" under VIT− parameter definition in Section 6.5.
TPS3824-33DBVR 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:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3824-33DBVR FAQ
1.How can I place an order for TPS3824-33DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3824-33DBVR 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 TPS3824-33DBVR reliable?
The price and inventory of TPS3824-33DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3824-33DBVR is usually 5 days.
3.What payment methods are accepted for TPS3824-33DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3824-33DBVR transactions.
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4.How is shipping managed for TPS3824-33DBVR?
TPS3824-33DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3824-33DBVR 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 TPS3824-33DBVR?
For technical support, including TPS3824-33DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3824-33DBVR requirements.
6.How does Aetrix verify that TPS3824-33DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3824-33DBVR 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 TPS3824-33DBVR meets industry standards.
7.What is the process for return or replacement of TPS3824-33DBVR?
All TPS3824-33DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3824-33DBVR, 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 TPS3824-33DBVR part is unused and in its original packaging.
Return procedure for TPS3824-33DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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