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Texas Instruments TPS3824-33DBVT
- Part No.:
- TPS3824-33DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3824-33DBVT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,833
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Product details
Overview
TPS3824-33DBVT from Texas Instruments is a 3.3V fixed-threshold voltage supervisor IC with active-high and active-low reset outputs, integrated watchdog timer (1.6s timeout), 200ms reset delay, and 15μA typical supply current in a 5-pin SOT-23 package. It monitors microcontroller supply rails and ensures reliable power-on initialization and fault recovery in embedded systems.
For engineers reviewing the TPS3824-33DBVT datasheet, TPS3824-33DBVT pinout, TPS3824-33DBVT application, or TPS3824-33DBVT equivalent, key selection criteria include its dual-reset output logic, watchdog timer behavior under WDI transition constraints, 2.93V threshold accuracy over −40°C to 85°C, and compatibility with 3.3V DSP/microcontroller reset interfaces requiring both push-pull assertion and system-level supervision.
Technical Context
The TPS3824-33DBVT implements a fixed internal voltage divider to set VIT− = 2.93V (nominal) with 50mV hysteresis, enabling precise 3.3V rail monitoring without external components. Its dual-output architecture provides simultaneous active-low (RESET) and active-high (RESET) signals for flexible interface design with bidirectional reset pins or level-sensitive controllers.
Watchdog functionality relies on edge-triggered WDI input detection: a falling edge clears the 1.6s timeout counter, while sustained high/low states beyond timeout assert RESET for 200ms. The device operates from 1.1V to 5.5V and uses internal pull-up on MR (90kΩ) to support manual reset initiation without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply threshold | 2.93V nominal (VIT−), ±70mV over −40°C to 85°C - ensures accurate 3.3V rail supervision with margin against brownout |
| Reset delay time | 200ms - guarantees sufficient hold time for processor core and peripheral initialization after power stabilization |
| Watchdog timeout | 1.6s - provides robust firmware hang detection interval compatible with typical MCU instruction cycles |
| Supply current | 15μA typical - enables integration into battery-powered systems without significant quiescent load impact |
| Output drive | Push-pull RESET and RESET - eliminates need for external pull-up resistors and supports direct connection to CMOS inputs |
| Operating temperature | −40°C to 85°C - qualified for industrial and commercial embedded applications with thermal cycling requirements |
| Input hysteresis | 50mV - prevents oscillatory reset assertion during slow-rising or noisy supply transitions |
Pinout & Package
TPS3824-33DBVT uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts in portable and industrial electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 5) | Power supply input and monitored rail | Supplies device operation and serves as the voltage source for threshold comparison; functional from 1.1V to 5.5V |
| GND (Pin 2) | Ground reference | Common return path for all internal circuitry and output drivers; must be low-impedance for stable reset timing |
| RESET (Pin 1) | Active-low reset output | Push-pull driver asserts logic low during power-up, brownout, or watchdog timeout; sinks up to 3mA |
| RESET (Pin 3) | Active-high reset output | Complementary push-pull signal to Pin 1; drives high during normal operation and low during fault conditions |
| WDI (Pin 4) | Watchdog timer input | Edge-sensitive input requiring falling edge every ≤1.6s to prevent reset; internally generates pulses if left floating |
Key Features
| Feature | Design Value |
|---|---|
| Dual active reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic systems |
| Fixed 3.3V threshold | 2.93V nominal VIT− with 50mV hysteresis enables drop-in replacement for 3.3V systems without calibration or resistor networks |
| Integrated watchdog timer | 1.6s timeout with edge-triggered WDI input provides autonomous firmware health monitoring without external timing components |
| Low-power operation | 15μA typical IDD allows continuous supervision in always-on subsystems without compromising battery life |
| Manual reset support | MR pin omitted in TPS3824 variant - simplifies layout by removing unused control line while retaining full supervision capability |
Applications
| Microcontroller Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Ensuring clean boot of ARM Cortex-M4-based controller after 3.3V rail stabilizes, with watchdog monitoring main application loop. IC Role / Device Role / Timing Role: Voltage supervisor providing 200ms power-on reset pulse and 1.6s watchdog timeout to detect firmware lockup. Use Value: Prevents execution of corrupted code by enforcing minimum reset duration and detecting software hangs before hardware damage occurs. | Use Scenario: Monitoring fieldbus communication module supply in programmable logic controller cabinet exposed to wide temperature swings. IC Role / Device Role / Timing Role: 3.3V rail supervisor with −40°C to 85°C rating ensuring reliable reset assertion during cold-start and thermal stress events. Use Value: Eliminates need for external hysteresis components while maintaining 50mV noise immunity on noisy industrial power rails. |
| Portable Medical Sensor Node | Notebook Platform EC Reset Management |
Use Scenario: Supervising ultra-low-power BLE sensor hub powered by coin-cell battery with intermittent wake cycles. IC Role / Device Role / Timing Role: Low-quiescent-current (15μA) supervisor asserting reset during brownout and providing watchdog coverage during active measurement phases. Use Value: Extends battery life by minimizing standby current while guaranteeing deterministic recovery from supply dips during RF transmission. | Use Scenario: Managing embedded controller reset sequencing in x86 notebook platform where EC requires synchronized 3.3V domain initialization. IC Role / Device Role / Timing Role: Dual-output supervisor delivering both active-low and active-high reset signals to interface with legacy EC GPIO and modern level-sensitive reset controllers. Use Value: Enables single-component solution for mixed-signal reset distribution, reducing BOM count and PCB footprint versus discrete buffer implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33DBVT | Single active-low RESET output; identical 2.93V threshold, 200ms delay, and 1.6s watchdog | Lacks active-high RESET output - requires external inverter for systems needing complementary reset signaling | Select when only one reset polarity is required and board space is constrained |
| TPS3825-33DBVT | Includes manual reset (MR) pin; otherwise matches TPS3824-33DBVT electrical specs and dual outputs | Supports external hardware reset initiation via MR input - adds flexibility for front-panel or diagnostic reset buttons | Choose when system-level manual reset capability is required alongside watchdog supervision |
Compared with TPS3824-33DBVT, TPS3823-33DBVT reduces pin count and cost but sacrifices reset polarity flexibility, while TPS3825-33DBVT adds MR functionality at the expense of slightly higher complexity in unused-pin management.
Availability
TPS3824-33DBVT is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, notebook platform EC management, and microcontroller-based IoT gateways requiring stable component supply with guaranteed long-term availability.
Supply support for TPS3824-33DBVT 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and microcontroller solutions.
The TPS382x family was designed specifically for reliable power-on reset generation and real-time system supervision in DSP, microcontroller, and microprocessor applications where deterministic initialization and fault recovery are critical.
FAQ
What is the exact supply voltage threshold for TPS3824-33DBVT?
The TPS3824-33DBVT has a nominal negative-going input threshold voltage (VIT−) of 2.93V, with a guaranteed range of 2.86V to 3.00V across −40°C to 85°C. This fixed threshold is set by an internal voltage divider and requires no external components, making TPS3824-33DBVT suitable for precise 3.3V rail monitoring in industrial and portable applications.
Does TPS3824-33DBVT support both active-high and active-low reset outputs simultaneously?
Yes, TPS3824-33DBVT provides both RESET (active-low) and RESET (active-high) outputs in push-pull configuration. This dual-output capability allows direct interfacing with processors having bidirectional reset pins or systems requiring complementary logic levels without external inverters, distinguishing TPS3824-33DBVT from single-output variants like TPS3823-33DBVT.
What is the watchdog timeout period for TPS3824-33DBVT and how is it triggered?
The TPS3824-33DBVT features a 1.6s watchdog timeout period. It is triggered when the WDI input remains static (high or low) beyond this interval; a falling edge on WDI resets the timer. If WDI is left floating, TPS3824-33DBVT internally generates pulses to prevent spurious reset, ensuring robust operation even in unconnected configurations.
Can TPS3824-33DBVT operate from a 1.8V supply?
No, TPS3824-33DBVT requires VDD ≥ 1.1V to assert power-on reset but is specified for reliable operation only when VDD ≥ 2.5V for accurate 3.3V threshold monitoring. While the device powers on at 1.1V, its VIT− comparator and output drivers are characterized for 2.5V–5.5V operation; using below 2.5V may result in undefined reset behavior and is outside the recommended operating conditions for TPS3824-33DBVT.
Is there a manual reset (MR) input on TPS3824-33DBVT?
No, TPS3824-33DBVT does not include a manual reset (MR) input. Unlike TPS3825-33DBVT or TPS3823-33DBVT, the TPS3824 variant omits the MR pin to simplify layout and reduce pin count while retaining full voltage supervision and watchdog functionality. System-level manual reset must be implemented externally if required for the application using TPS3824-33DBVT.
TPS3824-33DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
TPS3824-33DBVT FAQ
1.How can I place an order for TPS3824-33DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3824-33DBVT 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 TPS3824-33DBVT reliable?
The price and inventory of TPS3824-33DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3824-33DBVT is usually 5 days.
3.What payment methods are accepted for TPS3824-33DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3824-33DBVT transactions.
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4.How is shipping managed for TPS3824-33DBVT?
TPS3824-33DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3824-33DBVT 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 TPS3824-33DBVT?
For technical support, including TPS3824-33DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3824-33DBVT requirements.
6.How does Aetrix verify that TPS3824-33DBVT is sourced from the original manufacturer or authorized distributors?
All TPS3824-33DBVT 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 TPS3824-33DBVT meets industry standards.
7.What is the process for return or replacement of TPS3824-33DBVT?
All TPS3824-33DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3824-33DBVT, 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 TPS3824-33DBVT part is unused and in its original packaging.
Return procedure for TPS3824-33DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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