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Texas Instruments TPS3823-33QDBVRQ1
- Part No.:
- TPS3823-33QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3823-33QDBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3823-33QDBVRQ1 from Texas Instruments is an automotive-grade voltage supervisor IC with integrated watchdog timer, fixed 3.3 V supply monitoring threshold, 200 ms reset delay, and active-low push-pull reset output. It operates from −40°C to 125°C and consumes only 15 µA typical supply current. It is used for reliable power-on reset and runtime fault detection in automotive microcontrollers such as the MSP430C325.
For engineers reviewing the TPS3823-33QDBVRQ1 datasheet, TPS3823-33QDBVRQ1 pinout, TPS3823-33QDBVRQ1 application, or TPS3823-33QDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 2.84–3.00 V negative-going threshold (VIT−) over full temperature range, watchdog timeout of 0.9–2.5 s, manual reset input support, and SOT-23-5 package compatibility with space-constrained automotive PCBs.
Technical Context
The TPS3823-33QDBVRQ1 implements a fixed-threshold voltage supervision architecture with internal hysteresis (50 mV) and a dedicated watchdog timer requiring periodic WDI falling-edge transitions. Its reset assertion logic is triggered when VDD falls below VIT−, and release is delayed by 200 ms after VDD rises above VIT− + VHYS.
It features a manual reset input (MR) that forces active-low RESET regardless of VDD level or watchdog state, and supports direct interfacing with microcontroller I/O pins via push-pull output capable of sinking 3 mA at 0.45 V. The device requires no external components for basic operation and integrates internal pull-up on MR (90 kΩ typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.1 V to 5.5 V - powers device and enables supervision of 3.3 V rails even during brownout conditions down to 1.1 V. |
| VIT− threshold (min/max) | 2.84 V / 3.00 V at −40°C to 125°C - ensures robust 3.3 V rail monitoring across automotive temperature extremes. |
| Reset delay time (td) | 120 ms / 300 ms - guarantees sufficient system stabilization before releasing reset to downstream MCU. |
| Watchdog timeout (ttout) | 0.9 s / 2.5 s - provides fail-safe recovery window for firmware hangs in safety-critical automotive control loops. |
| Supply current (IDD) | 15 µA typical - enables use in always-on vehicle subsystems without compromising battery drain budgets. |
| Output type | Active-low push-pull - drives standard CMOS reset inputs directly without external pull-up resistors. |
| ESD rating (HBM) | ±2000 V - meets MIL-STD-883 requirements for handling in automotive manufacturing environments. |
Pinout & Package
TPS3823-33QDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low reset output | Push-pull driver asserts low during power-on, brownout, or watchdog timeout; releases high after 200 ms delay. |
| 2: GND | Ground reference | Primary return path for internal circuitry and output current; must be connected to system ground plane. |
| 3: MR | Manual reset input | Active-low signal; forces RESET low when pulled ≤0.3×VDD; internally pulled up to VDD via 90 kΩ resistor. |
| 4: WDI | Watchdog timer input | Falling-edge-triggered; failure to toggle within timeout period causes RESET assertion; floating disables watchdog. |
| 5: VDD | Supply and monitored rail | Powers device and serves as monitored voltage source; threshold detection begins at 1.1 V, full supervision at ≥2.84 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to 125°C ambient operation, enabling deployment in engine control units and ADAS ECUs. |
| Fixed 3.3 V supervision threshold | Eliminates need for external resistor divider; VIT− tightly specified at 2.93 V nominal with ±67 mV tolerance over temperature. |
| Integrated 200 ms power-on reset delay | Ensures stable clock and supply settling before releasing reset to processor, preventing premature execution. |
| Dedicated WDI pin with auto-disable on float | Prevents spurious resets when WDI is unconnected; internal oscillator pulses WDI to inhibit timeout if left floating. |
| Low 15 µA quiescent current | Supports always-on vehicle modules (e.g., body control, telematics) without accelerating battery discharge. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors 3.3 V supply powering the main MCU and CAN transceiver in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Provides power-on reset initiation and runtime watchdog supervision to detect firmware lockups during closed-loop fuel injection control. Use Value: Ensures deterministic MCU restart within 200 ms of valid supply, and triggers fail-safe shutdown within 2.5 s of software hang - meeting ISO 26262 ASIL-B timing constraints. |
Use Scenario: Supervises 3.3 V rail feeding vision processor and radar SoC in lane departure warning and automatic emergency braking modules. IC Role / Device Role / Timing Role: Generates clean reset pulse at power-up and monitors processor health via WDI to prevent undetected sensor fusion failures. Use Value: Delivers guaranteed 2.84–3.00 V threshold accuracy across −40°C to 125°C, eliminating false resets due to thermal drift in under-hood environments. |
| Body Control Module (BCM) | Infotainment Head Unit |
|
Use Scenario: Controls reset sequencing for microcontrollers managing door locks, lighting, and HVAC in centralized vehicle body networks. IC Role / Device Role / Timing Role: Acts as primary voltage supervisor with manual reset capability for field service diagnostics and firmware updates. Use Value: Internal 90 kΩ MR pull-up eliminates external component count; 15 µA supply current extends sleep-mode battery life in parked-vehicle scenarios. |
Use Scenario: Ensures reliable boot of application processor and audio DSP in automotive infotainment systems powered from 3.3 V LDOs. IC Role / Device Role / Timing Role: Provides synchronized reset release after power stabilization and detects OS-level hangs via WDI interface. Use Value: Push-pull RESET output drives processor reset pin directly without external pull-up, reducing BOM cost and PCB footprint in multi-layer head unit designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33DBVR | Non-automotive grade; lacks AEC-Q100 qualification and extended temperature characterization. | Not suitable for under-hood or safety-critical automotive use; limited to industrial or consumer applications. | Select only for cost-sensitive non-automotive designs where Grade 1 qualification is unnecessary. |
| TPS3828-33QDBVRQ1 | Same supervision thresholds and watchdog, but open-drain RESET output instead of push-pull. | Requires external pull-up resistor; enables wired-OR reset bus configurations with multiple supervisors. | Choose when shared reset bus or level-shifting to different voltage domains is required. |
Compared with TPS3823-33QDBVRQ1, TPS3823-33DBVR omits automotive qualification and thermal validation, while TPS3828-33QDBVRQ1 trades push-pull drive strength for open-drain flexibility - making each alternative suitable only for specific system-level interface or compliance requirements.
Availability
TPS3823-33QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, body electronics, infotainment systems, and telematics modules requiring stable component supply with full AEC-Q100 traceability.
Supply support for TPS3823-33QDBVRQ1 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, embedded processing, and automotive ICs, with decades of experience in high-reliability automotive electronics.
The TPS382x-Q1 product line delivers AEC-Q100-qualified voltage supervisors for functional safety-critical automotive systems, emphasizing precise threshold accuracy, watchdog reliability, and seamless integration with microcontrollers.
FAQ
What is the exact VIT− threshold range for TPS3823-33QDBVRQ1 over temperature?
The TPS3823-33QDBVRQ1 has a negative-going input threshold voltage (VIT−) of 2.84 V minimum to 3.00 V maximum across the full −40°C to 125°C operating temperature range, with 2.93 V nominal at 25°C. This tight 67 mV window ensures consistent 3.3 V rail supervision without false triggering due to thermal drift.
Does TPS3823-33QDBVRQ1 require external components for basic operation?
No, the TPS3823-33QDBVRQ1 requires no external components for core supervision functionality. Its fixed 3.3 V threshold is set internally, and the 200 ms reset delay and watchdog timer are fully integrated. A 0.1 µF ceramic capacitor on VDD is recommended only for noisy supplies - not mandatory.
How does the watchdog timer in TPS3823-33QDBVRQ1 behave when the WDI pin is left unconnected?
When WDI is left floating, the TPS3823-33QDBVRQ1 internally generates pulses to prevent watchdog timeout. This auto-disable behavior avoids unintended resets in systems where watchdog functionality is unused, eliminating the need for external pull-up/down resistors on WDI.
Can TPS3823-33QDBVRQ1 drive a microcontroller reset pin directly without external circuitry?
Yes, the TPS3823-33QDBVRQ1 features an active-low push-pull RESET output capable of sinking 3 mA at 0.45 V, which directly interfaces with standard CMOS reset inputs (e.g., MSP430C325). No external pull-up resistor is needed, simplifying schematic design and reducing BOM count.
Is TPS3823-33QDBVRQ1 qualified for safety-critical automotive applications?
Yes, the TPS3823-33QDBVRQ1 is AEC-Q100 qualified for Grade 1 (−40°C to 125°C), with documented HBM ESD classification Level 2 (±2000 V) and CDM Level C4B (±750 V). It is designed for use in ASIL-B automotive systems including engine control, ADAS, and body electronics where functional safety is required.
TPS3823-33QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 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
TPS3823-33QDBVRQ1 FAQ
1.How can I place an order for TPS3823-33QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3823-33QDBVRQ1 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 TPS3823-33QDBVRQ1 reliable?
The price and inventory of TPS3823-33QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3823-33QDBVRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3823-33QDBVRQ1 transactions.
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TPS3823-33QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3823-33QDBVRQ1 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 TPS3823-33QDBVRQ1?
For technical support, including TPS3823-33QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3823-33QDBVRQ1 requirements.
6.How does Aetrix verify that TPS3823-33QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3823-33QDBVRQ1 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 TPS3823-33QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3823-33QDBVRQ1?
All TPS3823-33QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3823-33QDBVRQ1, 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 TPS3823-33QDBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3823-33QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS3823-33QDBVRQ1 Tags
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