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Texas Instruments TPS3820-50DBVT
- Part No.:
- TPS3820-50DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3820-50DBVT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:799
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Product details
Overview
TPS3820-50DBVT from Texas Instruments is a 5-pin SOT-23 voltage supervisor IC with active-low reset output, manual reset input (MR), and watchdog timer (WDI), designed for 5V supply rail monitoring in microcontroller-based systems. It features a fixed 25ms reset delay, 4.46–4.64V negative-going threshold (VIT−), 15μA typical supply current, and operates from −40°C to 85°C.
For engineers reviewing the TPS3820-50DBVT datasheet, TPS3820-50DBVT pinout, TPS3820-50DBVT application, or TPS3820-50DBVT equivalent, this page delivers verified functional specifications, validated pin roles, confirmed watchdog timing behavior, and real-world use cases in embedded power sequencing and fault recovery circuits.
Technical Context
The TPS3820-50DBVT implements a fixed-threshold supervision architecture with internal voltage divider setting VIT− = 4.55V (nominal) and hysteresis of 50mV. Its watchdog timer triggers reset after 112–300ms of WDI inactivity, and its 25ms reset delay begins only after VDD exceeds VIT− + VHYS.
It uses push-pull RESET output with VOL ≤ 0.4V at 3mA sink, supports MR-driven forced reset independent of VDD level, and requires no external components for basic operation - all functions implemented within the 2.90mm × 1.60mm SOT-23 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.46–4.64V (−40°C to 85°C); ensures reliable 5V rail detection with margin against brownout |
| Reset Delay (td) | 15–37ms (typ. 25ms); guarantees sufficient hold time for microcontroller initialization |
| Watchdog Timeout (ttout) | 112–300ms; provides fail-safe recovery window for firmware hangs in 5V systems |
| Supply Current (IDD) | 15–25μA; enables low-power operation in battery-backed or energy-sensitive designs |
| Output Type | Active-low push-pull RESET; drives logic directly without pull-up resistor |
| Operating Temp | −40°C to 85°C; qualified for industrial-grade embedded control environments |
| Package | 5-pin SOT-23 (DBV); 2.90mm × 1.60mm footprint compatible with high-density PCB layouts |
Pinout & Package
TPS3820-50DBVT is housed in a 5-pin SOT-23 (DBV) package with 2.90mm × 1.60mm body size and standard lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low reset output | Push-pull driver; asserts low during power-on, brownout, or watchdog timeout |
| 2: GND | Ground reference | Return path for internal circuitry and output stage; must be low-impedance |
| 3: MR | Manual reset input | Active-low trigger; forces RESET low when pulled below 0.3×VDD, with internal 90kΩ pullup |
| 4: WDI | Watchdog timer input | Falling-edge sensitive; resets watchdog timer; floating state generates internal pulses to prevent false timeout |
| 5: VDD | Supply voltage input | Monitored rail (5V nominal); powers device and initiates POR at >1.1V; operates up to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 25ms reset delay | Guarantees minimum reset assertion time for reliable microcontroller boot sequence |
| Integrated watchdog timer | 112–300ms timeout prevents system lockup without external timing components |
| Manual reset (MR) input | Enables hardware-initiated reset independent of supply voltage level |
| No external components required | Internal voltage divider and oscillator eliminate BOM cost and layout area |
| Low quiescent current | 15μA typical draw extends battery life in portable 5V applications |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 5V main supply in programmable logic controller with ARM Cortex-M7 core. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog timer ensuring deterministic reset on power instability or firmware hang. Use Value: Prevents corrupted I/O states by enforcing 25ms minimum reset pulse and triggering recovery within 300ms of WDI stall. |
Use Scenario: Supervises 5V rail powering ECG signal chain and Bluetooth LE radio in handheld diagnostic device. IC Role / Device Role / Timing Role: Active-low reset generator with MR override for user-initiated recalibration and watchdog protection during sleep/wake transitions. Use Value: 15μA supply current minimizes standby drain; 4.55V threshold rejects noise-induced false resets near 5V nominal. |
| Notebook System Management | Smart Energy Meter |
Use Scenario: Controls power sequencing of 5V auxiliary rail feeding EC (Embedded Controller) and keyboard backlight driver. IC Role / Device Role / Timing Role: Supervisor with MR input tied to lid-open sensor and WDI fed by EC heartbeat signal. Use Value: 25ms delay aligns with EC boot timing; push-pull RESET eliminates need for external pull-up on shared reset bus. |
Use Scenario: Ensures robust restart of 5V MCU and metrology ASIC after grid voltage sags or transient surges. IC Role / Device Role / Timing Role: Primary reset source with VIT− set to 4.55V to tolerate ±5% line regulation drift. Use Value: 50mV hysteresis prevents chatter during slow-rising/falling 5V rails; −40°C to 85°C rating covers outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-50DBVT | 200ms reset delay (vs. 25ms); same 4.55V threshold and watchdog timeout | Suitable for systems requiring longer reset hold time, e.g., FPGA configuration or multi-stage power sequencing | Select TPS3823-50DBVT only if extended reset duration is explicitly required; not drop-in for TPS3820-50DBVT timing-critical designs |
| MAX6326UT46D3+T | 4.63V threshold, 200ms delay, no watchdog timer, 3-pin SOT-23 package | Lacks WDI functionality; used where only power-on reset is needed, not runtime fault detection | Choose MAX6326UT46D3+T when watchdog capability is unnecessary and board space allows 3-pin footprint reduction |
Compared with TPS3823-50DBVT and MAX6326UT46D3+T, the TPS3820-50DBVT uniquely delivers 25ms reset timing plus integrated watchdog - enabling faster boot cycles and runtime firmware supervision in compact 5V embedded systems where both features are essential.
Availability
TPS3820-50DBVT is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, notebook system management units, and smart energy meters requiring stable component supply and long-term production continuity.
Supply support for TPS3820-50DBVT 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 and embedded processing technologies, with decades of experience in power management and system supervision ICs.
The TPS382x product line was engineered specifically for reliable power-on reset and runtime fault detection in DSP, microcontroller, and microprocessor systems - delivering integrated supervision with minimal external components.
FAQ
What is the exact reset threshold voltage range for TPS3820-50DBVT?
The TPS3820-50DBVT has a negative-going input threshold voltage (VIT−) of 4.46V (min), 4.55V (nom), and 4.64V (max) across −40°C to 85°C. This 5V-specific threshold ensures accurate detection of brownout conditions while maintaining 3.5% hysteresis margin relative to nominal rail.
Does TPS3820-50DBVT require external components for basic operation?
No. The TPS3820-50DBVT requires no external resistors, capacitors, or timing components for core supervision functionality. Its fixed 4.55V threshold, 25ms delay, and 200ms watchdog timeout are implemented entirely internally - simplifying design and reducing BOM count.
How does the watchdog timer in TPS3820-50DBVT respond to WDI pin states?
The TPS3820-50DBVT watchdog timer resets on each falling edge at WDI. If WDI remains static (high or low) beyond 112–300ms, RESET asserts for 15–37ms. When WDI is left floating, the device generates internal pulses to prevent false timeout - but a 1kΩ pull-down is recommended if deterministic behavior is required.
Can TPS3820-50DBVT be used with a 3.3V supply rail?
No. The TPS3820-50DBVT is specified for 5V supervision only (VIT− = 4.55V). For 3.3V systems, use TPS3820-33DBVT (VIT− = 2.93V) or TPS3823-33DBVT. Applying 3.3V to TPS3820-50DBVT results in permanent failure to assert RESET during brownout due to insufficient overdrive.
What is the maximum supply voltage rating for TPS3820-50DBVT?
The absolute maximum VDD rating for TPS3820-50DBVT is 6V, but recommended operating range is 1.1V to 5.5V. Operation above 5.5V risks damage or parametric shift; sustained 5.5V is acceptable per datasheet limits, though 5.0V is the target nominal rail for this variant.
TPS3820-50DBVT 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:
- 4.55V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 15ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3820-50DBVT FAQ
1.How can I place an order for TPS3820-50DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3820-50DBVT 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 TPS3820-50DBVT reliable?
The price and inventory of TPS3820-50DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3820-50DBVT is usually 5 days.
3.What payment methods are accepted for TPS3820-50DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3820-50DBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3820-50DBVT?
TPS3820-50DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3820-50DBVT 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 TPS3820-50DBVT?
For technical support, including TPS3820-50DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3820-50DBVT requirements.
6.How does Aetrix verify that TPS3820-50DBVT is sourced from the original manufacturer or authorized distributors?
All TPS3820-50DBVT 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 TPS3820-50DBVT meets industry standards.
7.What is the process for return or replacement of TPS3820-50DBVT?
All TPS3820-50DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3820-50DBVT, 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 TPS3820-50DBVT part is unused and in its original packaging.
Return procedure for TPS3820-50DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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