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Texas Instruments TPS3820-50QDBVRQ1
- Part No.:
- TPS3820-50QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3820-50QDBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
TPS3820-50QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer, fixed 25ms reset delay, active-low push-pull RESET output, manual reset (MR) input, and 4.55V threshold voltage (VIT−). It monitors 5V supply rails in microcontroller-based systems and asserts reset during brownout or system hang events.
For engineers reviewing the TPS3820-50QDBVRQ1 datasheet, TPS3820-50QDBVRQ1 pinout, TPS3820-50QDBVRQ1 application, or TPS3820-50QDBVRQ1 equivalent, this page delivers verified electrical parameters, automotive-grade timing supervision behavior, SOT-23-5 package integration guidance, and validated alternative options for functional replacement in safety-critical embedded designs.
Technical Context
The TPS3820-50QDBVRQ1 implements a fixed-threshold voltage supervisor with internal 4.55V detection (±50mV over −40°C to 125°C), hysteresis of 50mV, and power-on reset assertion at VDD ≥ 1.1V. Its watchdog timer triggers reset if WDI fails to toggle within 112–300ms, and MR forces immediate reset independent of VDD level.
Reset output is active-low push-pull with VOL ≤ 0.45V at 3mA sink current and VOH ≥ VDD − 1.5V at 120µA source current. Supply current is 15µA typical with no external components required, enabling direct integration into space-constrained automotive control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.1V to 5.5V - operates across full automotive battery transient range including cold-crank conditions. |
| Threshold voltage (VIT−) | 4.49V to 4.64V - precisely targets 5V rail monitoring with ±1.3% tolerance over temperature. |
| Reset delay time (td) | 15ms to 37ms - short 25ms nominal delay enables rapid system recovery after power stabilization. |
| Watchdog timeout (ttout) | 112ms to 300ms - configurable window for firmware watchdog refresh without requiring external timing elements. |
| Supply current (IDD) | 15µA typical - ultra-low quiescent current preserves battery life in always-on automotive modules. |
| ESD rating (HBM) | ±2000V - exceeds MIL-STD-883 requirements for robustness in manufacturing and field environments. |
| Operating temperature | −40°C to 125°C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications. |
Pinout & Package
TPS3820-50QDBVRQ1 uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts in automotive ECUs and ADAS modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives microcontroller reset pin directly; sinks up to 3mA while maintaining VOL ≤ 0.45V. |
| 2: GND | Ground reference | Primary return path for internal comparator and output stage; must be low-impedance connection. |
| 3: MR | Manual reset input | Active-low signal; pulls RESET low when asserted and holds for full delay period after release. |
| 4: WDI | Watchdog timer input | Falling-edge-triggered; requires periodic toggling within timeout window to prevent spurious reset. |
| 5: VDD | Supply and monitored rail | Powers device and serves as supervised voltage source; asserts reset if drops below 4.49V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to 125°C operation with HBM ESD ≥ ±2000V and CDM ≥ ±750V. |
| Fixed 25ms reset delay | Enables faster system initialization than 200ms alternatives, reducing boot latency in real-time controllers. |
| Integrated watchdog timer | Eliminates need for external RC timing network; supports fail-safe recovery from firmware lockup. |
| Manual reset (MR) input | Allows external hardware or diagnostic logic to force system reset regardless of VDD level or watchdog state. |
| No external components required | Internal voltage divider sets threshold; bypass capacitor only needed if supply is noisy (e.g., 0.1µF ceramic). |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 5V supply to MCU and sensor interface ICs during engine start-stop cycles and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with watchdog ensures deterministic reset during brownout and firmware hang events. Use Value: Prevents undefined MCU state during voltage sags; 25ms delay enables fast restart after cranking recovery. |
Use Scenario: Supervises power to radar processor and camera SoC in forward collision warning modules. IC Role / Device Role / Timing Role: Dual-role supervisor: detects 5V rail faults and resets processor on software timeout via WDI. Use Value: Meets ASIL-B functional safety requirements by enforcing controlled reboot upon detected failure modes. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Provides power-on reset and runtime supervision for LIN gateway microcontrollers managing door locks and lighting. IC Role / Device Role / Timing Role: Manual reset input (MR) allows diagnostics tool to initiate safe reinitialization without cycling main power. Use Value: Enables in-vehicle service mode entry and firmware update coordination without disrupting vehicle bus. |
Use Scenario: Ensures clean boot sequence for application processor and audio DSP after ignition-on transition. IC Role / Device Role / Timing Role: Active-low RESET output interfaces directly with processor's dedicated reset pin; WDI guards against UI freeze. Use Value: Eliminates need for discrete RC reset circuit, saving board space and improving long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3820-50QPDBVRQ1 | Functionally identical; newer orderable part number with same electrical specs and pinout. | Same automotive qualification and thermal performance; intended for new designs. | Select TPS3820-50QPDBVRQ1 for production ramp; TPS3820-50QDBVRQ1 is NRND but supported for legacy BOM continuity. |
| TPS3823-50QDBVRQ1 | 200ms reset delay instead of 25ms; otherwise identical threshold, watchdog, and package. | Suitable where longer reset hold time is required for complex peripheral initialization. | Choose TPS3823-50QDBVRQ1 only if system firmware requires >100ms reset assertion; otherwise TPS3820-50QDBVRQ1 offers tighter timing control. |
Compared with TPS3820-50QPDBVRQ1, the TPS3820-50QDBVRQ1 provides identical supervision functionality but is designated Not Recommended for New Designs; compared with TPS3823-50QDBVRQ1, it delivers 8× shorter reset delay critical for responsive automotive control loops.
Availability
TPS3820-50QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TPS3820-50QDBVRQ1 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 for automotive, industrial, and personal electronics markets.
The TPS382x-Q1 family was designed specifically for automotive voltage supervision-providing AEC-Q100-qualified reset generation, watchdog protection, and manual reset capability in miniature SOT-23 packages.
FAQ
What is the exact reset threshold voltage for TPS3820-50QDBVRQ1?
The TPS3820-50QDBVRQ1 has a guaranteed negative-going input threshold voltage (VIT−) of 4.49V (min), 4.55V (typ), and 4.64V (max) across −40°C to 125°C. This 5V-specific threshold ensures accurate detection of 5V rail undervoltage events without false triggering during nominal operation.
Does TPS3820-50QDBVRQ1 require external components to operate?
No, the TPS3820-50QDBVRQ1 requires no external resistors or capacitors for basic supervision. Its threshold is set internally, and reset timing is fixed. A 0.1µF ceramic capacitor on VDD is recommended only if the supply exhibits high-frequency noise that could cause reset chatter.
How does the watchdog timer function on TPS3820-50QDBVRQ1?
The TPS3820-50QDBVRQ1 watchdog timer triggers reset if the WDI pin remains static (high or low) beyond 112–300ms. It clears on each falling edge of WDI and reasserts RESET for the full 15–37ms delay period upon timeout-ensuring firmware must actively maintain the watchdog to avoid system reset.
Is TPS3820-50QDBVRQ1 pin-compatible with other TPS382x-Q1 variants?
Yes, all TPS382x-Q1 devices in the DBV (SOT-23-5) package share identical pinout: RESET, GND, MR, WDI, VDD. However, output logic (active-high vs. active-low), delay time (25ms vs. 200ms), and watchdog presence vary by suffix-so electrical compatibility must be verified per application.
What is the status of TPS3820-50QDBVRQ1 for new designs?
TPS3820-50QDBVRQ1 is designated Not Recommended for New Designs (NRND) by Texas Instruments. For new projects, TI recommends migrating to TPS3820-50QPDBVRQ1, which is functionally identical and fully supported with long-term availability assurance.
TPS3820-50QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3820-50QDBVRQ1 FAQ
1.How can I place an order for TPS3820-50QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3820-50QDBVRQ1 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 TPS3820-50QDBVRQ1 reliable?
The price and inventory of TPS3820-50QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3820-50QDBVRQ1 is usually 5 days.
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TPS3820-50QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3820-50QDBVRQ1 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 TPS3820-50QDBVRQ1?
For technical support, including TPS3820-50QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3820-50QDBVRQ1 requirements.
6.How does Aetrix verify that TPS3820-50QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3820-50QDBVRQ1 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 TPS3820-50QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3820-50QDBVRQ1?
All TPS3820-50QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3820-50QDBVRQ1, 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 TPS3820-50QDBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3820-50QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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