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Texas Instruments TPS3851G33SQDRBRQ1
- Part No.:
- TPS3851G33SQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851G33SQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
TPS3851G33SQDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with integrated programmable watchdog timer, 0.8% undervoltage threshold accuracy (–40°C to +125°C), 200 ms reset timeout (±15%), and open-drain RESET/WDO outputs. It monitors 3.3 V rails in ADAS domain controllers and front camera modules, delivering precision fault detection without external timing components.
For engineers reviewing the TPS3851G33SQDRBRQ1 datasheet, TPS3851G33SQDRBRQ1 pinout, TPS3851G33SQDRBRQ1 application, or TPS3851G33SQDRBRQ1 equivalent, this device supports critical automotive safety functions including manual reset assertion, watchdog disable via SET1, capacitor-programmable or factory-set watchdog timeouts, and 0.5% hysteresis for noise-immune rail monitoring.
Technical Context
The TPS3851G33SQDRBRQ1 implements a precision bandgap reference and comparator architecture to achieve 0.8% VITN accuracy across –40°C to +125°C ambient, with 0.5% hysteresis ensuring stable reset release in noisy automotive environments. Its dual-output structure separates system reset (RESET) from fault diagnostics (WDO), enabling selective recovery without full reboot.
Watchdog timing is determined by CWD pin configuration: unconnected or 10 kΩ pullup selects factory-programmed 1.6 s (standard) or 200 ms (extended) timeouts; capacitor connection enables user-defined delays from 0.7 ms to 77 s. SET1 dynamically disables the watchdog, and WDI accepts falling-edge triggers with 150 µs setup time after enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 1.6 V to 6.5 V - supports direct monitoring of 1.8 V to 5.0 V rails including 3.3 V without level shifting |
| VITN Accuracy | ±0.8% (–40°C to +125°C) - ensures reliable reset assertion before microcontroller VDD minima in automotive thermal cycles |
| tRST | 200 ms ±15% - fixed high-precision delay prevents premature MCU boot in power-rail ramp-up scenarios |
| IDD | 10 µA typical - ultra-low quiescent current extends battery life in always-on vehicle systems |
| Hysteresis | 0.5% - suppresses chatter during slow or noisy VDD transitions, eliminating false resets |
| Watchdog Timeout | 1.6 s (standard) or 200 ms (extended), factory-set - eliminates external RC timing component for production stability |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for under-hood and cabin ECUs |
Pinout & Package
TPS3851G33SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON package with wettable flanks for automated optical inspection. Thermal pad is internally connected to GND and must be soldered to a large-area ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply input | Monitored rail input; requires 0.1 µF bypass capacitor for noise immunity in automotive EMI environments |
| GND | Ground reference | Common return path for all internal circuits; connects directly to thermal pad for thermal dissipation |
| MR | Manual reset input | Active-low trigger; internally pulled up - allows processor-initiated reset without external pullup resistor |
| SET1 | Watchdog enable/disable control | Logic low disables watchdog; prevents spurious timeouts during firmware development or debug mode |
| CWD | Watchdog timing selection | Determines timeout source: unconnected/10 kΩ pullup → factory setting; capacitor → user-programmable delay |
| WDI | Watchdog input | Falling-edge triggered; must be driven to VDD or GND at all times to avoid IDD increase from floating logic states |
| WDO | Watchdog output | Independent open-drain flag - asserts low on timeout only when RESET is high, enabling diagnostic-only fault signaling |
| RESET | System reset output | Open-drain output with 200 ms delay; requires external 1–100 kΩ pullup to correct voltage rail for multi-device reset bus |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - suitable for engine bay, ADAS sensor, and infotainment ECU deployment |
| 0.8% VITN accuracy over temperature | Guarantees reset assertion before SoC brownout thresholds even at extreme junction temperatures |
| Dual independent outputs (RESET + WDO) | Enables system-level fault isolation: WDO signals watchdog fault while RESET maintains clean boot sequence |
| Factory-programmed watchdog timers | Eliminates timing capacitor tolerance drift and board space; delivers 15% accuracy without calibration |
| Watchdog disable via SET1 | Allows safe firmware validation and bootloader testing without risk of unintended system reset |
| Wettable flanks VSON package | Supports automated AOI for solder joint integrity - critical for zero-defect automotive manufacturing |
Applications
| ADAS Domain Controller | Automotive Front Camera |
|---|---|
|
Use Scenario: Monitors 3.3 V power rail supplying image signal processor and MIPI interface in autonomous driving domain controller. IC Role / Device Role / Timing Role: Precision voltage supervisor with integrated watchdog - asserts RESET if rail drops below 3.135 V (3.3 V × 95%), holds reset for 200 ms, and flags software hang via WDO. Use Value: Prevents corrupted frame processing due to undervoltage or firmware lockup, meeting ASIL-B functional safety requirements. |
Use Scenario: Supervises 3.3 V supply to CMOS image sensor and ISP in driver-facing or forward-looking camera module. IC Role / Device Role / Timing Role: Dual-output supervisor - RESET ensures clean boot after cold crank; WDO detects ISP firmware freeze without disrupting video streaming path. Use Value: Enables fail-operational behavior: camera continues streaming while logging watchdog faults for diagnostic upload. |
| Surround View System ECU | Vehicle Occupant Detection Sensor |
|
Use Scenario: Controls power sequencing and health monitoring for multi-camera fusion ECU with CAN FD and Ethernet interfaces. IC Role / Device Role / Timing Role: High-accuracy supervisor - uses MR pin for coordinated reset across camera inputs and GPU subsystems during OTA update rollback. Use Value: Synchronizes reset propagation across heterogeneous compute domains, reducing boot-time variance to <50 ms. |
Use Scenario: Ensures reliable operation of capacitive or radar-based occupant sensing node powered from 3.3 V LDO in seatback assembly. IC Role / Device Role / Timing Role: Low-current supervisor - draws only 10 µA while continuously validating rail integrity and detecting MCU lockup via WDI pulse monitoring. Use Value: Extends battery-backed operation time in key-off monitoring mode beyond 30 days per ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3851G33SQDQ1RQ1 | Same core functionality but in 8-pin SOIC package (4.9 mm × 6.0 mm); no wettable flanks; 50% larger footprint | Lacks VSON thermal performance and AOI capability - suitable for non-automotive prototyping or legacy PCB rework | Select only when board layout cannot accommodate 3 mm × 3 mm VSON or when hand-soldering is required |
| MAX6373KA33+T | Fixed 3.3 V reset threshold (±2.5%); no watchdog timer; 20 µA IDD; SOT23-5 package | Provides basic reset only - cannot replace TPS3851G33SQDRBRQ1 in systems requiring fault diagnostics or software hang detection | Use only in cost-sensitive, non-safety-critical applications where watchdog functionality is omitted from system architecture |
Compared with TPS3851G33SQDRBRQ1, the SOIC variant trades miniaturization and manufacturability for ease of handling, while the MAX6373 offers lower cost at the expense of functional safety features, accuracy, and diagnostic capability required in modern ADAS designs.
Availability
TPS3851G33SQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, front camera modules, surround view ECUs, and occupant detection sensors requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TPS3851G33SQDRBRQ1 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-grade power management and supervisory ICs.
The TPS3851-Q1 product line delivers AEC-Q100 qualified voltage supervisors with integrated watchdog timers for functional safety-critical automotive systems including ADAS, body electronics, and infotainment.
FAQ
What is the undervoltage threshold voltage for TPS3851G33SQDRBRQ1?
The TPS3851G33SQDRBRQ1 is factory-programmed for a 3.3 V nominal undervoltage threshold (VITN), with ±0.8% accuracy across –40°C to +125°C. This corresponds to a guaranteed trip point between 3.274 V and 3.326 V under specified operating conditions, enabling precise alignment with 3.3 V microcontroller supply tolerances.
Does TPS3851G33SQDRBRQ1 require an external timing capacitor for watchdog operation?
No - TPS3851G33SQDRBRQ1 supports factory-programmed watchdog timeouts (1.6 s standard or 200 ms extended) when the CWD pin is left unconnected or pulled up to VDD via 10 kΩ. An external capacitor is optional and only needed for user-defined timeouts ranging from 0.7 ms to 77 s.
How does the SET1 pin affect watchdog behavior in TPS3851G33SQDRBRQ1?
In TPS3851G33SQDRBRQ1, grounding the SET1 pin disables the watchdog timer entirely - WDI pulses are ignored, and WDO remains high-impedance. This allows safe firmware development and bootloader testing without risk of unintended reset, while retaining full RESET supervision capability.
What package type and dimensions does TPS3851G33SQDRBRQ1 use?
TPS3851G33SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON (DRB) package with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a large-area ground plane for thermal and electrical performance compliance.
Can TPS3851G33SQDRBRQ1 monitor voltages other than 3.3 V?
Yes - although TPS3851G33SQDRBRQ1 is optimized for 3.3 V rails, its 1.6 V to 6.5 V VDD range and precision reference allow monitoring of common automotive rails including 1.8 V, 2.5 V, 3.0 V, and 5.0 V. Threshold accuracy remains ±0.8% across the full temperature range for any supported rail.
TPS3851G33SQDRBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 170ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-VSON (3x3)
TPS3851G33SQDRBRQ1 FAQ
1.How can I place an order for TPS3851G33SQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851G33SQDRBRQ1 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 TPS3851G33SQDRBRQ1 reliable?
The price and inventory of TPS3851G33SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G33SQDRBRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G33SQDRBRQ1 transactions.
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4.How is shipping managed for TPS3851G33SQDRBRQ1?
TPS3851G33SQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851G33SQDRBRQ1 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 TPS3851G33SQDRBRQ1?
For technical support, including TPS3851G33SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G33SQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851G33SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851G33SQDRBRQ1 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 TPS3851G33SQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851G33SQDRBRQ1?
All TPS3851G33SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G33SQDRBRQ1, 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 TPS3851G33SQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851G33SQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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