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Texas Instruments TPS3820-33QDBVRQ1
- Part No.:
- TPS3820-33QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3820-33QDBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3820-33QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated watchdog timer, fixed 3.3 V supply monitoring threshold (2.84–3.00 V), 25 ms reset delay, and active-low push-pull RESET output. It monitors microcontroller power rails in safety-critical automotive systems and asserts reset below threshold or on watchdog timeout.
For engineers reviewing the TPS3820-33QDBVRQ1 datasheet, TPS3820-33QDBVRQ1 pinout, TPS3820-33QDBVRQ1 application, or TPS3820-33QDBVRQ1 equivalent, this page delivers verified electrical specs, automotive-grade timing behavior, SOT-23 pin mapping, and real-world substitution guidance for processor supervision designs.
Technical Context
The TPS3820-33QDBVRQ1 implements a fixed-threshold voltage supervisor with internal hysteresis (50 mV) and a dedicated watchdog timer requiring periodic WDI falling-edge triggers to prevent reset assertion. Its reset logic is active-low and push-pull, with propagation delays under 0.1 µs for MR-to-RESET and 25 µs for VDD-to-RESET transitions.
It operates across −40°C to +125°C, draws only 15 µA typical supply current, and requires no external components-its 2.93 V nominal threshold (3.3 V variant) is set by an internal resistor divider. The device asserts RESET when VDD falls below VIT− or when WDI remains static beyond 112–300 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1 V to 5.5 V - powers and monitors rail; enables operation during brown-out conditions down to 1.1 V. |
| Threshold Voltage (VIT−) | 2.84–3.00 V at −40°C to +125°C - precisely tracks 3.3 V rail with ±2.7% tolerance over full temp range. |
| Reset Delay Time (td) | 15–37 ms - ensures stable power-up before releasing processor from reset, shorter than 200 ms variants. |
| Watchdog Timeout (ttout) | 112–300 ms - detects firmware hangs; requires WDI falling edge within interval to avoid system reset. |
| Supply Current (IDD) | 15 µA typical - minimizes quiescent load in always-on automotive modules like body control units. |
| ESD Rating (HBM) | ±2000 V - meets MIL-STD-883 Method 3015, supporting robust handling in automotive manufacturing. |
| Output Type | Active-low push-pull - drives RESET directly without pull-up; sinks up to 3 mA at 0.45 V. |
Pinout & Package
TPS3820-33QDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCBs.
| 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 delay. |
| 2: GND | Ground reference | Primary return path for internal circuitry and output stage; must be low-impedance for noise immunity. |
| 3: MR | Manual reset input | Asynchronous active-low trigger; forces RESET low regardless of VDD or WDI state; internally pulled up ~90 kΩ. |
| 4: WDI | Watchdog timer input | Falling-edge sensitive; resets watchdog timer on each transition; floating state generates internal pulses to prevent false reset. |
| 5: VDD | Power supply & monitored rail | Input for both device operation and voltage supervision; asserts RESET if drops below VIT− (2.84–3.00 V). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation, enabling use in engine bay and ADAS ECUs. |
| 25 ms fixed reset delay | Enables faster system boot than 200 ms variants-critical for real-time automotive control loops. |
| Integrated watchdog timer | Eliminates need for external timing components; prevents silent firmware lockup in microcontrollers. |
| No external components required | Fixed threshold, internal pull-up on MR, and self-clocking watchdog reduce BOM count and layout area. |
| Low 15 µA supply current | Extends battery life in always-on vehicle modules such as telematics and gateway controllers. |
Applications
| Engine Control Unit (ECU) Power Supervision | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3 V supply to MCU and CAN transceiver during cold cranking and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor with watchdog; asserts RESET if VDD dips below 2.84 V or firmware fails to toggle WDI. Use Value: Prevents corrupted flash writes and unsafe actuator commands by enforcing clean restart under transient faults. |
Use Scenario: Ensures reliable boot and runtime supervision of image sensor and ISP SoC in rear-view camera systems. IC Role / Device Role / Timing Role: Active-low reset generator with 25 ms delay; synchronizes power sequencing between analog front-end and digital core. Use Value: Eliminates black screen or frozen video on startup by guaranteeing proper initialization timing after power stabilization. |
| Automotive Body Control Module (BCM) | Electric Power Steering (EPS) Microcontroller Supervision |
Use Scenario: Supervises 3.3 V rail powering LIN transceivers and door-lock MCUs in low-power sleep/wake cycles. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor (15 µA); uses MR pin to coordinate wake-up from deep sleep via external sensor signal. Use Value: Maintains functional safety integrity while minimizing parasitic drain on 12 V battery during vehicle off-state. |
Use Scenario: Provides fail-safe reset to EPS MCU during torque-sensing anomalies or motor driver fault conditions. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor; WDI tied to safety monitor loop; triggers immediate reset on missed heartbeat. Use Value: Meets ASIL-B requirements by detecting software stalls before steering assist degradation occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3820-33QPDBVRQ1 | Functionally identical; same pinout, specs, and timing; newer orderable part per TI's replacement notice. | Recommended for new designs; replaces NRND TPS3820-33QDBVRQ1 with identical footprint and function. | Select TPS3820-33QPDBVRQ1 for production continuity and long-term availability assurance. |
| TPS3823-33QDBVRQ1 | Same 3.3 V threshold but 200 ms reset delay and 1.6 s watchdog timeout; otherwise identical pinout and features. | Suitable where longer reset hold time is needed for complex boot sequences; not drop-in due to timing mismatch. | Choose only if system firmware requires ≥200 ms reset assertion; verify compatibility with existing timing margins. |
Compared with TPS3820-33QDBVRQ1, TPS3820-33QPDBVRQ1 offers guaranteed long-term supply and identical performance, while TPS3823-33QDBVRQ1 trades shorter delay for extended watchdog and reset timing-requiring firmware validation before substitution.
Availability
TPS3820-33QDBVRQ1 is available at Aetrix Electronics and suitable for automotive ECU power supervision, ADAS camera module boot sequencing, and body control module sleep/wake management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TPS3820-33QDBVRQ1 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-grade ICs, with decades of experience delivering high-reliability solutions for safety-critical systems.
The TPS382x-Q1 product line was designed specifically for automotive voltage supervision-integrating reset generation, manual reset, and watchdog functionality into compact, AEC-Q100-qualified packages for microcontroller-based ECUs.
FAQ
What is the exact supply voltage threshold range for TPS3820-33QDBVRQ1?
The TPS3820-33QDBVRQ1 has a negative-going input threshold voltage (VIT−) of 2.84 V minimum to 3.00 V maximum across −40°C to +125°C, with a nominal value of 2.93 V. This range is factory-trimmed to supervise 3.3 V rails with ±2.7% tolerance, and includes 50 mV hysteresis to prevent chatter near threshold.
Does TPS3820-33QDBVRQ1 support active-high reset output?
No. The TPS3820-33QDBVRQ1 provides only an active-low push-pull RESET output (pin 1). Active-high reset is available only on TPS3824/5-xx-Q1 variants. Using TPS3820-33QDBVRQ1 with an active-high interface requires an external inverter or level-shifter circuit.
What is the watchdog timeout window for TPS3820-33QDBVRQ1?
The watchdog timeout (ttout) for TPS3820-33QDBVRQ1 is specified from 112 ms to 300 ms at TJ = 25°C. The timer resets on each WDI falling edge; failure to provide such an edge within this window triggers RESET assertion for the full 15–37 ms delay period.
Can the manual reset (MR) pin of TPS3820-33QDBVRQ1 be left unconnected?
Yes. The MR pin has an internal ~90 kΩ pull-up resistor to VDD. Leaving it open defaults to inactive (high) state. However, for noise immunity in automotive environments, TI recommends tying MR to VDD through a 10 kΩ resistor or using a filtered RC network if driven externally.
Is TPS3820-33QDBVRQ1 recommended for new designs?
No. Texas Instruments designates TPS3820-33QDBVRQ1 as "Not Recommended for New Designs" (NRND). For new projects, TI specifies TPS3820-33QPDBVRQ1 as the functionally equivalent, pin-compatible replacement with assured long-term availability and identical electrical behavior.
TPS3820-33QDBVRQ1 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:
- 2.93V
- 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
TPS3820-33QDBVRQ1 FAQ
1.How can I place an order for TPS3820-33QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3820-33QDBVRQ1 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 TPS3820-33QDBVRQ1 reliable?
The price and inventory of TPS3820-33QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3820-33QDBVRQ1 is usually 5 days.
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5.How can I obtain technical support or documentation for TPS3820-33QDBVRQ1?
For technical support, including TPS3820-33QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3820-33QDBVRQ1 requirements.
6.How does Aetrix verify that TPS3820-33QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3820-33QDBVRQ1 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 TPS3820-33QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3820-33QDBVRQ1?
All TPS3820-33QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3820-33QDBVRQ1, 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 TPS3820-33QDBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3820-33QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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