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Texas Instruments 2U3823-50QDBVRG4Q1
- Part No.:
- 2U3823-50QDBVRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
2U3823-50QDBVRG4Q1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
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Product details
Overview
2U3823-50QDBVRG4Q1 from Texas Instruments is an automotive-grade voltage supervisor IC with integrated watchdog timer, fixed 4.55 V threshold (±1.2% over −40°C to 125°C), 200 ms reset delay, push-pull active-low RESET output, and manual reset (MR) input - used for reliable power-on initialization and fault recovery in automotive microcontrollers.
For engineers reviewing the 2U3823-50QDBVRG4Q1 datasheet, 2U3823-50QDBVRG4Q1 pinout, 2U3823-50QDBVRG4Q1 application, or 2U3823-50QDBVRG4Q1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 15 µA typical supply current, 5-pin SOT-23 package, watchdog timeout of 1.6 s, and compatibility with 5 V supply rails in safety-critical automotive systems.
Technical Context
The 2U3823-50QDBVRG4Q1 implements a precision bandgap-based voltage reference with 50 mV hysteresis to reject noise-induced false resets. Its internal watchdog timer requires periodic WDI edge transitions (rising or falling) within 1.6 s to prevent assertion of RESET.
It features a dedicated MR input that forces RESET low independent of VDD level, and uses a push-pull output stage capable of sinking 3 mA at 0.45 V (max) while maintaining VOH ≥ 0.8 × VDD under load - enabling direct interface with 5 V logic without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1 V to 5.5 V - supports operation during brown-out and startup of 5 V systems |
| Threshold Voltage (VIT−) | 4.55 V (typ), ±1.2% over −40°C to 125°C - precisely monitors 5 V rails with minimal drift |
| Reset Delay Time (td) | 200 ms (min–max range 120–300 ms) - ensures stable power-up before releasing downstream logic |
| Watchdog Timeout (ttout) | 1.6 s (typ), 0.9–2.5 s range - provides robust supervision window for automotive firmware execution |
| Supply Current (IDD) | 15 µA (typ), ≤25 µA (max) - enables ultra-low-power monitoring in always-on vehicle modules |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor on reset line |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets AEC-Q100 stress requirements for automotive PCB handling |
Pinout & Package
2U3823-50QDBVRG4Q1 is housed in a 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with gull-wing leads optimized for automated assembly and thermal performance (RθJA = 209.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low reset output | Push-pull driver asserts low during power-up, brown-out, or watchdog timeout; releases high after td |
| 2: GND | Ground reference | Primary return path for internal circuitry and output sink current; must be low-impedance |
| 3: MR | Manual reset input | Active-low signal forces RESET low regardless of VDD; internal 52 kΩ pullup if left floating |
| 4: WDI | Watchdog timer input | Edge-sensitive (rising/falling); timeout occurs if no transition detected within 1.6 s |
| 5: VDD | Supply and monitored rail | Powers device and serves as input to threshold comparator; requires 0.1 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for −40°C to +125°C ambient operation - validated for engine bay and ADAS ECU environments |
| Fixed 4.55 V threshold | No external resistors needed - eliminates BOM cost and layout sensitivity of adjustable supervisors |
| Integrated 1.6 s watchdog timer | Hardware-enforced firmware liveness check - prevents silent hangs in automotive control loops |
| 200 ms power-on reset delay | Guarantees stable VDD and clock settling before releasing processor reset - avoids premature boot |
| MR input with internal pullup | Enables system-level reset initiation (e.g., button press or diagnostic command) without external components |
| 15 µA supply current | Minimizes quiescent load on battery-backed or low-power domains - critical for parking-mode functions |
Applications
| Engine Control Unit (ECU) Power Supervision | ADAS Camera Module Reset Management |
|---|---|
Use Scenario: Monitors 5 V supply to MCU and CAN transceiver during cold cranking and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor with watchdog and manual reset - ensures deterministic reset sequencing and firmware health verification. Use Value: Prevents ECU lockup during voltage transients by asserting RESET within 1.6 s of WDI stall and holding it for 200 ms post-recovery. |
Use Scenario: Provides supervised power-up and runtime watchdog for image sensor and ISP in surround-view camera. IC Role / Device Role / Timing Role: Dual-role supervisor - initiates clean boot via 200 ms delay and enforces periodic firmware heartbeat via WDI. Use Value: Eliminates need for discrete RC reset and external watchdog IC, reducing board area and BOM count by one component. |
| Body Control Module (BCM) Sleep/Wake Integrity | Infotainment Head Unit Power Sequencing |
Use Scenario: Manages reset state during stop-start cycles where 5 V rail dips below 4.44 V but recovers rapidly. IC Role / Device Role / Timing Role: Precision threshold detector with 50 mV hysteresis - rejects noise while ensuring valid brown-out detection. Use Value: Avoids spurious resets during transient dips, improving BCM reliability and reducing diagnostic trouble code (DTC) false positives. |
Use Scenario: Coordinates release of main SoC reset with power rail stabilization and audio codec enable timing. IC Role / Device Role / Timing Role: System-level supervisor - synchronizes hardware reset release with software boot readiness via MR and WDI handshake. Use Value: Enables deterministic multi-rail power sequencing without FPGA or CPLD intervention, lowering system complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-50-Q1 | Same functional spec, identical pinout and electrical behavior - differs only in TI's internal part numbering and tape-and-reel packaging variant | No functional difference; both qualified per AEC-Q100 Grade 1 and specified for −40°C to 125°C | Select 2U3823-50QDBVRG4Q1 for TI's standard automotive-grade DBV packaging and traceable lot control. |
| TPS3828-50-Q1 | Replaces push-pull RESET with open-drain output; retains same 4.55 V threshold, 200 ms delay, and 1.6 s watchdog | Requires external pull-up resistor; enables wired-OR reset bus sharing across multiple subsystems | Choose TPS3828-50-Q1 only when system-level reset arbitration or multi-source reset injection is required. |
Compared with TPS3823-50-Q1, 2U3823-50QDBVRG4Q1 offers identical supervision functionality and automotive qualification, while TPS3828-50-Q1 trades push-pull drive strength for open-drain flexibility - making the former optimal for standalone reset control and the latter for shared reset architectures.
Availability
2U3823-50QDBVRG4Q1 is available at Aetrix Electronics and suitable for automotive ECUs, ADAS camera modules, and body control units requiring stable component supply with full AEC-Q100 compliance and long-term production support.
Supply support for 2U3823-50QDBVRG4Q1 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 leader delivering analog, embedded processing, and connectivity solutions for automotive, industrial, and consumer markets.
The TPS382x-xx-Q1 product line delivers AEC-Q100-qualified voltage supervisors with integrated watchdog timers, designed specifically for reliable power sequencing and fault recovery in automotive electronic control units.
FAQ
What is the exact threshold voltage tolerance of the 2U3823-50QDBVRG4Q1 over temperature?
The 2U3823-50QDBVRG4Q1 has a nominal threshold voltage of 4.55 V with a maximum deviation of ±1.2% across the full −40°C to +125°C operating range, as specified in the Electrical Characteristics table under "Negative-going input threshold voltage (VIT−)" at TA = –40°C to 125°C. This ensures consistent 5 V rail monitoring despite under-hood thermal cycling.
Does the 2U3823-50QDBVRG4Q1 require external components for basic operation?
No, the 2U3823-50QDBVRG4Q1 operates autonomously with no external resistors or capacitors required for core supervision. A 0.1 µF ceramic capacitor is recommended at the VDD pin for noise immunity, but it is not mandatory for functionality. The internal voltage divider sets the 4.55 V threshold, and the MR pin includes a 52 kΩ internal pullup.
How does the watchdog timer in the 2U3823-50QDBVRG4Q1 respond to WDI signal failures?
If the WDI pin remains static (no rising or falling edge) beyond the 1.6 s watchdog timeout (ttout), the 2U3823-50QDBVRG4Q1 asserts the active-low RESET output for the full 200 ms delay period (td). After td expires, RESET returns high - but will reassert immediately if WDI remains inactive, creating a repeating reset cycle until valid WDI transitions resume.
Can the 2U3823-50QDBVRG4Q1 be used with a 3.3 V microcontroller supply rail?
No - the 2U3823-50QDBVRG4Q1 is configured for 5 V rail supervision with a fixed 4.55 V threshold. For 3.3 V systems, use the pin-compatible 2U3823-33QDBVRG4Q1 (2.93 V threshold) or TPS3823-33-Q1. Using the -50 variant on a 3.3 V rail would cause permanent RESET assertion since VDD never exceeds VIT−.
What is the maximum sink current capability of the RESET output in the 2U3823-50QDBVRG4Q1?
The RESET output of the 2U3823-50QDBVRG4Q1 can sink up to 3 mA while maintaining a low-level output voltage (VOL) ≤ 0.45 V, as tested at VDD = VIT− – 0.2 V. This allows direct driving of standard CMOS reset inputs without external pull-downs or level shifters in 5 V systems.
2U3823-50QDBVRG4Q1 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:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
2U3823-50QDBVRG4Q1 FAQ
1.How can I place an order for 2U3823-50QDBVRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2U3823-50QDBVRG4Q1 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 2U3823-50QDBVRG4Q1 reliable?
The price and inventory of 2U3823-50QDBVRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2U3823-50QDBVRG4Q1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2U3823-50QDBVRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
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2U3823-50QDBVRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2U3823-50QDBVRG4Q1 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 2U3823-50QDBVRG4Q1?
For technical support, including 2U3823-50QDBVRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2U3823-50QDBVRG4Q1 requirements.
6.How does Aetrix verify that 2U3823-50QDBVRG4Q1 is sourced from the original manufacturer or authorized distributors?
All 2U3823-50QDBVRG4Q1 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 2U3823-50QDBVRG4Q1 meets industry standards.
7.What is the process for return or replacement of 2U3823-50QDBVRG4Q1?
All 2U3823-50QDBVRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with 2U3823-50QDBVRG4Q1, 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 2U3823-50QDBVRG4Q1 part is unused and in its original packaging.
Return procedure for 2U3823-50QDBVRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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