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Texas Instruments 2U3820-50QDBVRG4Q1
- Part No.:
- 2U3820-50QDBVRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
2U3820-50QDBVRG4Q1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
2U3820-50QDBVRG4Q1 from Texas Instruments is an automotive-grade voltage supervisor IC with integrated watchdog timer, manual reset input, and active-low push-pull reset output. It monitors 5 V supply rails, asserts reset below 4.44–4.64 V (−40°C to 125°C), features 25 ms reset delay, consumes 15 µA typical supply current, and operates in SOT-23-5 package for microcontroller power-up supervision in safety-critical automotive systems.
For engineers reviewing the 2U3820-50QDBVRG4Q1 datasheet, 2U3820-50QDBVRG4Q1 pinout, 2U3820-50QDBVRG4Q1 application, or 2U3820-50QDBVRG4Q1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (−40°C to 125°C), fixed 5 V threshold with 50 mV hysteresis, 25 ms delay timing, watchdog timeout disable capability via WDI high-impedance detection, and compatibility with MSP430 and other automotive microcontrollers requiring reliable power-on and fault recovery.
Technical Context
The 2U3820-50QDBVRG4Q1 implements a precision bandgap-based voltage reference and comparator to detect VDD drops below its nominal 5 V threshold (VIT− = 4.55 V typ at 25°C). Its internal 25 ms delay timer ensures sufficient reset pulse width after power stabilization, while the watchdog timer requires periodic WDI transitions to prevent spurious resets - disabled automatically if WDI floats into high-impedance state.
This device integrates manual reset (MR) with internal 52 kΩ pullup, supports bidirectional reset signaling with push-pull RESET output, and uses no external components for threshold setting. Its functional mode table confirms that MR low forces immediate active-low RESET regardless of VDD level or watchdog status, enabling system-level emergency reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1 V to 5.5 V - enables operation during brown-out and supports wide-input automotive power domains. |
| Negative Threshold Voltage (VIT−) | 4.44–4.64 V (−40°C to 125°C) - precise 5 V rail monitoring with guaranteed margin against nominal 5 V ±5% tolerance. |
| Hysteresis | 50 mV - prevents oscillation during slow-rising or noisy supply transitions near threshold. |
| Reset Delay Time (td) | 15–37 ms (typ 25 ms) - ensures stable microcontroller initialization before release from reset. |
| Watchdog Timeout (ttout) | 112–300 ms (typ 200 ms) - detects firmware lockup in time-critical automotive control loops. |
| Supply Current (IDD) | 15 µA typ - ultra-low quiescent consumption for always-on battery-connected modules. |
| ESD Rating (HBM) | ±2000 V - meets MIL-STD-883 Class 2 requirements for robustness in automotive assembly environments. |
Pinout & Package
Package: SOT-23-5 (DBV), body size 2.90 mm × 1.60 mm, surface-mount, RoHS-compliant, qualified per AEC-Q100 Grade 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 5) | Power supply input and monitored rail | Supplies internal circuitry and serves as the voltage source under supervision; must be decoupled with 100 nF ceramic capacitor. |
| GND (Pin 2) | Ground reference | Common return path for all internal functions; requires low-inductance PCB connection to minimize noise coupling. |
| RESET (Pin 1) | Active-low push-pull reset output | Drives microcontroller reset pin directly; sinks ≥3 mA at VOL ≤0.4 V, eliminating need for external pull-down. |
| MR (Pin 3) | Manual reset input | Active-low signal; internally pulled up to VDD via 52 kΩ resistor - connect to GND or logic low to force reset. |
| WDI (Pin 4) | Watchdog timer input | Edge-triggered input; rising or falling edge resets watchdog timer; high-impedance detection disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to 125°C ambient operation - suitable for engine bay and transmission control unit deployments. |
| Fixed 5 V threshold with 50 mV hysteresis | Eliminates external resistor divider; ensures deterministic reset behavior across temperature without calibration. |
| 25 ms reset delay | Shorter than standard 200 ms supervisors - accelerates boot sequence in real-time automotive applications. |
| Automatic watchdog disable on WDI float | Prevents unintended resets when WDI is unconnected or driven by tri-stated logic - simplifies design-in and debug. |
| Integrated 52 kΩ MR pullup | Reduces BOM count and layout area; allows MR to be left floating or tied to VDD when unused. |
Applications
| Engine Control Unit (ECU) Power Supervision | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 5 V supply to MCU and sensor interface ASIC during cold cranking and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor with watchdog and manual reset - provides power-on reset, brown-out detection, and firmware hang recovery. Use Value: Ensures deterministic MCU startup and fault recovery within 25 ms, meeting ISO 26262 ASIL-B timing constraints. |
Use Scenario: Supervises 5 V rail powering image signal processor and MIPI interface in rear-view camera module. IC Role / Device Role / Timing Role: Reset generator with 25 ms delay and WDI-driven watchdog - guarantees clean boot and runtime health monitoring. Use Value: Prevents corrupted image streaming due to MCU lockup; 15 µA IDD extends battery-backed operation during vehicle sleep mode. |
| Electric Power Steering (EPS) Motor Controller | Automotive Infotainment Head Unit |
Use Scenario: Validates 5 V auxiliary supply feeding safety-critical motor gate driver logic and CAN transceiver. IC Role / Device Role / Timing Role: Automotive supervisor with MR override - enables ECU-initiated reset during torque fault conditions. Use Value: Supports fail-safe shutdown sequences; MR pin allows host MCU to trigger controlled reset without cycling main power. |
Use Scenario: Provides reset coordination between application processor, audio codec, and display controller during ignition-on sequence. IC Role / Device Role / Timing Role: Fixed-threshold supervisor with push-pull RESET - drives multiple reset inputs simultaneously with defined timing. Use Value: Eliminates need for external reset buffer; 4.44–4.64 V threshold ensures reset assertion before 5 V rail falls outside SoC operating spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3820-50-Q1 | Identical electrical specs, same SOT-23-5 package, identical pinout and functionality - direct replacement. | No difference; both qualified per AEC-Q100 Grade 1, same 5 V threshold, 25 ms delay, and watchdog behavior. | Select TPS3820-50-Q1 if 2U3820-50QDBVRG4Q1 is unavailable; full form, fit, and function match confirmed by TI documentation. |
| TPS3823-50-Q1 | Same 5 V threshold and AEC-Q100 qualification, but 200 ms reset delay and different watchdog timeout (1.6 s). | Used where longer reset pulse is required for complex processors; not suitable for 25 ms-constrained timing paths. | Choose only if system design requires extended reset hold time; not drop-in compatible due to timing mismatch. |
Compared with TPS3820-50-Q1, 2U3820-50QDBVRG4Q1 offers identical performance and footprint, enabling seamless sourcing flexibility; versus TPS3823-50-Q1, it delivers 8× faster reset release critical for real-time automotive control loops, but lacks the longer watchdog timeout needed for slower firmware cycles.
Availability
2U3820-50QDBVRG4Q1 is available at Aetrix Electronics and suitable for automotive ECU power supervision, ADAS camera modules, and electric power steering controllers requiring stable component supply with AEC-Q100 compliance and traceable sourcing.
Supply support for 2U3820-50QDBVRG4Q1 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 automotive, industrial, and power management ICs.
The TPS382x-Q1 product line delivers AEC-Q100-qualified voltage supervisors for automotive DSPs, microcontrollers, and microprocessors - designed to ensure safe, reliable power-on initialization and runtime fault detection in harsh environments.
FAQ
What is the exact supply voltage threshold for 2U3820-50QDBVRG4Q1?
The 2U3820-50QDBVRG4Q1 has a negative-going input threshold voltage (VIT−) of 4.44 V minimum to 4.64 V maximum over −40°C to 125°C, with 4.55 V typical at 25°C. This fixed 5 V threshold is set by an internal voltage divider and requires no external components. The 50 mV hysteresis ensures stable operation during supply fluctuations, and the device asserts active-low RESET whenever VDD falls below this threshold.
Does 2U3820-50QDBVRG4Q1 support manual reset functionality?
Yes, 2U3820-50QDBVRG4Q1 includes a dedicated MR (manual reset) input on Pin 3. Pulling MR low forces immediate active-low RESET regardless of VDD level or watchdog status. The pin features an internal 52 kΩ pullup resistor, so it may be left unconnected or tied to VDD when unused. This allows host microcontrollers or external logic to initiate system-wide reset on demand - a critical feature for automotive safety mechanisms.
How does the watchdog timer behave in 2U3820-50QDBVRG4Q1?
The 2U3820-50QDBVRG4Q1 watchdog timer triggers RESET if the WDI pin (Pin 4) remains static beyond 112–300 ms (typ 200 ms). It resets on any rising or falling edge at WDI. Crucially, if WDI floats into high-impedance, the device auto-disables the watchdog - preventing unintended resets. This behavior is documented in TI's SGLS143C datasheet and eliminates need for external pullup/pulldown resistors in most implementations.
What is the reset delay time of 2U3820-50QDBVRG4Q1 and why is it important?
The 2U3820-50QDBVRG4Q1 provides a fixed reset delay time (td) of 15–37 ms (25 ms typical) after VDD rises above the threshold. This shorter delay - versus 200 ms in TPS3823/4/5/8 variants - accelerates system boot in time-sensitive automotive applications like EPS or ADAS. It ensures sufficient time for power rail stabilization and clock locking before releasing the microcontroller from reset, meeting strict ASIL-B timing budgets.
Is 2U3820-50QDBVRG4Q1 compatible with common automotive microcontrollers?
Yes, 2U3820-50QDBVRG4Q1 is explicitly validated for use with automotive MCUs including MSP430 series, and supports standard interfaces: active-low push-pull RESET drives MCU reset pins directly; MR accepts logic-level signals; WDI accepts CMOS-compatible edges. Its 15 µA supply current, −40°C to 125°C operation, and AEC-Q100 Grade 1 qualification make it interoperable with Renesas RH850, NXP S32K, and Infineon AURIX families in production automotive designs.
2U3820-50QDBVRG4Q1 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
2U3820-50QDBVRG4Q1 FAQ
1.How can I place an order for 2U3820-50QDBVRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2U3820-50QDBVRG4Q1 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 2U3820-50QDBVRG4Q1 reliable?
The price and inventory of 2U3820-50QDBVRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2U3820-50QDBVRG4Q1 is usually 5 days.
3.What payment methods are accepted for 2U3820-50QDBVRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2U3820-50QDBVRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2U3820-50QDBVRG4Q1?
2U3820-50QDBVRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2U3820-50QDBVRG4Q1 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 2U3820-50QDBVRG4Q1?
For technical support, including 2U3820-50QDBVRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2U3820-50QDBVRG4Q1 requirements.
6.How does Aetrix verify that 2U3820-50QDBVRG4Q1 is sourced from the original manufacturer or authorized distributors?
All 2U3820-50QDBVRG4Q1 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 2U3820-50QDBVRG4Q1 meets industry standards.
7.What is the process for return or replacement of 2U3820-50QDBVRG4Q1?
All 2U3820-50QDBVRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with 2U3820-50QDBVRG4Q1, 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 2U3820-50QDBVRG4Q1 part is unused and in its original packaging.
Return procedure for 2U3820-50QDBVRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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