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Texas Instruments TPS3851G18SQDRBRQ1
- Part No.:
- TPS3851G18SQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851G18SQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
TPS3851G18SQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor with integrated watchdog timer, featuring 0.8% undervoltage threshold accuracy (–40°C to +125°C), 200 ms reset timeout (±15%), and factory-programmed 1.6 s watchdog timeout. It monitors 1.8 V rails in ADAS domain controllers and front camera modules, delivering precision reset assertion before microcontroller supply tolerance violation.
For engineers reviewing the TPS3851G18SQDRBRQ1 datasheet, TPS3851G18SQDRBRQ1 pinout, TPS3851G18SQDRBRQ1 application, or TPS3851G18SQDRBRQ1 equivalent, key selection criteria include its ±0.5% hysteresis, 10 µA supply current, open-drain RESET/WDO outputs, MR input for manual reset, and CWD/SET1 programmability for watchdog configuration in safety-critical vehicle systems.
Technical Context
The TPS3851G18SQDRBRQ1 implements a precision bandgap-based comparator for undervoltage detection on VDD, with internal 0.5% hysteresis and 15% accurate reset delay timing. Its watchdog logic uses a constant-current source (375 nA) charging the CWD pin to set timeout via external capacitor or factory defaults.
It operates across 1.6 V–6.5 V supply range and supports dual watchdog modes: standard (1.6 s typ) and extended (77.45 s typ), selected by SET1 and CWD configuration. All inputs (MR, WDI, SET1) are CMOS-compatible with defined VIH/VIL thresholds, and outputs (RESET, WDO) are open-drain with 0.4 V VOL at 3 mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VITN Accuracy | ±0.8% over –40°C to +125°C - ensures reliable reset before MCU brownout on 1.8 V rail |
| tRST | 200 ms ±15% - precise power-up sequencing delay for SoC initialization |
| Watchdog Timeout | 1600 ms typ (factory default, SET1=1, CWD unconnected) - configurable fault-detection window |
| Supply Current | 10 µA typical - enables low-power always-on monitoring in vehicle ECU sleep modes |
| Hysteresis | 0.5% - prevents chatter during noisy rail transitions near threshold |
| Input Voltage Range | 1.6 V to 6.5 V - supports direct monitoring of 1.8 V, 2.5 V, 3.3 V, and 5.0 V rails |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for automotive PCBs |
Pinout & Package
TPS3851G18SQDRBRQ1 is housed in 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 | Power supply input | Monitored rail input; requires 0.1 µF bypass capacitor for noise immunity |
| GND | Ground reference | Common return path; connects internally to thermal pad |
| RESET | Open-drain reset output | Asserts low when VDD < VITN; held low for tRST after recovery; requires external pullup |
| WDO | Open-drain watchdog output | Asserts low only when watchdog times out and RESET is high; enables fault isolation without full reset |
| MR | Manual reset input | Pull-low initiates reset; internally pulled up; deassertion triggers tRST delay before release |
| WDI | Watchdog input | Falling edge resets watchdog timer; ignored when RESET is low or watchdog disabled via SET1 |
| CWD | Watchdog timeout programming | Capacitor-to-GND sets user-defined timeout; 10 kΩ pullup or open selects factory defaults |
| SET1 | Watchdog enable/disable control | Ground disables watchdog; VDD enables it; dynamic switching supported with 150 µs setup time |
Key Features
| Feature | Design Value |
|---|---|
| 0.8% VITN accuracy over temperature | Guarantees reset assertion before 1.8 V MCU supply falls below 1.728 V ±13.8 mV across full automotive range |
| Dual watchdog timing modes | Standard (1.6 s) and extended (77.45 s) options support both fast-fault detection and long-duration system health checks |
| Independent WDO output | Allows diagnostic logging of watchdog events without triggering full system reset, preserving state for debug |
| Wettable flank VSON package | Enables AOI verification of solder joint integrity on bottom-side thermal pad - critical for automotive reliability |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and safety manual to accelerate ISO 26262 ASIL-B system certification |
Applications
| Surround View System ECU | ADAS Domain Controller |
|---|---|
Use Scenario: Monitors 1.8 V core supply of multi-camera fusion processor during cold cranking and load dump transients. IC Role / Device Role / Timing Role: Precision voltage supervisor with independent watchdog output ensures deterministic reset timing and fault classification without disrupting sensor data flow. Use Value: Prevents silent corruption during rail sag by asserting RESET before MCU VDD drops below 1.728 V, while WDO flags intermittent software hangs separately. |
Use Scenario: Supervises 1.8 V I/O rail of centralized ADAS SoC managing radar, lidar, and vision processing. IC Role / Device Role / Timing Role: High-accuracy undervoltage detection combined with programmable watchdog enforces safe boot and runtime integrity checks. Use Value: 0.5% hysteresis eliminates false resets during ripple; 15% tRST accuracy guarantees synchronized SoC initialization across temperature. |
| Automotive Front Camera | Vehicle Occupant Detection Sensor |
Use Scenario: Ensures clean power-up and runtime supervision of 1.8 V image signal processor in A-pillar-mounted camera module. IC Role / Device Role / Timing Role: Dual-output (RESET + WDO) architecture provides layered fault response: hard reset for supply faults, soft alert for firmware stalls. Use Value: Factory-programmed 1.6 s watchdog timeout matches typical ISP firmware watchdog window, reducing integration effort. |
Use Scenario: Supervises 1.8 V supply of capacitive occupant sensing ASIC in seat-back electronics under wide ambient temperature swings. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualification and ±0.8% VITN accuracy ensure reliable operation from –40°C to +125°C junction. Use Value: 10 µA quiescent current enables continuous monitoring during vehicle sleep mode without draining battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3851G18SQDQ1RQ1 | Same die, 8-pin WSON package without wettable flanks; no AOI support on thermal pad | Lacks optical inspection capability for solder joints - unsuitable for high-reliability automotive production lines requiring AOI | Select only if AOI is not required and cost reduction outweighs process validation risk |
| MAX6373KA18+T | Fixed 1.8 V threshold, no programmable watchdog; 2.5% accuracy over temperature; no WDO output | Provides basic reset only - cannot isolate watchdog faults or support dynamic timeout adjustment | Use only for non-safety-critical subsystems where independent fault signaling and precision timing are unnecessary |
Compared with TPS3851G18SQDRBRQ1, the WSON variant sacrifices AOI capability for lower cost, while MAX6373 offers simpler supervision at the expense of functional safety features, accuracy, and diagnostic flexibility.
Availability
TPS3851G18SQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround-view ECUs, and front camera modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TPS3851G18SQDRBRQ1 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 ICs and functional safety solutions.
The TPS3851-Q1 product line delivers high-accuracy supervisory circuits for ASIL-B automotive systems, designed specifically to meet stringent AEC-Q100 Grade 1 requirements and simplify ISO 26262 compliance.
FAQ
What is the undervoltage threshold voltage for TPS3851G18SQDRBRQ1?
The TPS3851G18SQDRBRQ1 has a factory-set undervoltage threshold (VITN) of 1.728 V, corresponding to a nominal 1.8 V rail with 0.8% accuracy. This value is guaranteed across –40°C to +125°C ambient temperature and includes 0.5% hysteresis to prevent oscillation during rail recovery.
How does the watchdog timeout get configured on TPS3851G18SQDRBRQ1?
The TPS3851G18SQDRBRQ1 watchdog timeout is configured using the CWD and SET1 pins: leaving CWD unconnected or pulling it to VDD via 10 kΩ resistor selects factory defaults (1.6 s typ), while connecting a capacitor to CWD enables user-programmable timing. SET1 = GND disables the watchdog entirely.
What is the purpose of the WDO pin on TPS3851G18SQDRBRQ1?
The WDO pin on TPS3851G18SQDRBRQ1 provides an independent watchdog fault signal that asserts low only when a watchdog timeout occurs and RESET is high. This allows system-level diagnostics to distinguish between supply faults (RESET active) and software hangs (WDO active), supporting ASIL-B fault classification.
Does TPS3851G18SQDRBRQ1 support manual reset functionality?
Yes, TPS3851G18SQDRBRQ1 supports manual reset via the MR pin: applying a logic-low pulse ≥1 µs asserts RESET for the full tRST duration (200 ms typ). The MR pin is internally pulled up, so it may be left floating or tied to VDD if unused.
What package type and dimensions does TPS3851G18SQDRBRQ1 use?
TPS3851G18SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON package (DRB) 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.
TPS3851G18SQDRBRQ1 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:
- 1.8V
- 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)
TPS3851G18SQDRBRQ1 FAQ
1.How can I place an order for TPS3851G18SQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851G18SQDRBRQ1 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 TPS3851G18SQDRBRQ1 reliable?
The price and inventory of TPS3851G18SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G18SQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851G18SQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G18SQDRBRQ1 transactions.
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4.How is shipping managed for TPS3851G18SQDRBRQ1?
TPS3851G18SQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851G18SQDRBRQ1 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 TPS3851G18SQDRBRQ1?
For technical support, including TPS3851G18SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G18SQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851G18SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851G18SQDRBRQ1 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 TPS3851G18SQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851G18SQDRBRQ1?
All TPS3851G18SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G18SQDRBRQ1, 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 TPS3851G18SQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851G18SQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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