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Texas Instruments TPS3851G30EQDRBRQ1
- Part No.:
- TPS3851G30EQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851G30EQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
TPS3851G30EQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor 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 - used for microcontroller supervision in ADAS domain controllers and vehicle occupant detection sensors.
For engineers reviewing the TPS3851G30EQDRBRQ1 datasheet, TPS3851G30EQDRBRQ1 pinout, TPS3851G30EQDRBRQ1 application, or TPS3851G30EQDRBRQ1 equivalent, this page delivers verified functional safety-capable specifications, factory-programmed watchdog timing options, precision hysteresis (0.5%), and VSON-8 wettable flank package details essential for automotive power-rail monitoring and fault-detection system design.
Technical Context
The TPS3851G30EQDRBRQ1 implements a precision comparator-based undervoltage monitor with 0.8% VITN accuracy across –40°C to +125°C and 0.5% hysteresis, enabling reliable reset assertion before microcontroller supply tolerance limits are breached. Its dual-output architecture separates system reset (RESET) from fault signaling (WDO), allowing independent watchdog timeout detection without full system reset.
Watchdog timing is configurable via CWD pin: unconnected or pulled up with 10 kΩ selects factory-programmed delays (1600 ms typical standard mode), while capacitor coupling enables user-adjustable timeouts. SET1 pin disables the watchdog entirely, and WDI accepts falling-edge-triggered pulses with 150 µs setup time after enablement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 1.6 V to 6.5 V - supports direct monitoring of 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V rails without external scaling. |
| VITN Accuracy | ±0.8% (–40°C to +125°C) - ensures reset assertion within tight supply tolerance bands of automotive SoCs and MCUs. |
| tRST | 200 ms ±15% - fixed, high-precision reset delay prevents premature release during power ramp-up. |
| IDD | 10 µA typical - ultra-low quiescent current extends battery life in always-on automotive modules. |
| Hysteresis | 0.5% - suppresses chatter on noisy supply rails and improves noise immunity in ECU environments. |
| Watchdog Timeout | 1600 ms typical (standard mode, CWD NC, SET1 = 1) - factory-programmed precision timing eliminates external timing components. |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for under-hood and cabin electronics. |
Pinout & Package
TPS3851G30EQDRBRQ1 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 | Supply input | Monitored rail input; requires 0.1 µF bypass capacitor for noise immunity in automotive environments. |
| GND | Ground reference | Common return path; thermal pad connects internally to GND and must be exposed and soldered. |
| RESET | Open-drain reset output | Asserts low when VDD falls below VITN; remains low for tRST after recovery - drives MCU reset input. |
| WDO | Open-drain watchdog output | Asserts low independently of RESET upon watchdog timeout - signals fault condition without system reset. |
| MR | Manual reset input | Active-low input; internally pulled up - allows external logic or button to force system reset. |
| WDI | Watchdog input | Falling-edge-triggered; must be pulsed before tWD expires - enables software-controlled watchdog refresh. |
| CWD | Watchdog timing select | Determines timeout source: capacitor (user-programmable) or internal default (NC/10 kΩ pullup). |
| SET1 | Watchdog enable/disable | Logic-high enables watchdog; grounded disables it - permits safe development and debug modes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - suitable for engine bay, ADAS, and infotainment ECUs. |
| Functional Safety-Capable documentation | TI provides FIT rate, failure mode analysis, and safety manual - accelerates ISO 26262 ASIL-B system certification. |
| Precision undervoltage monitoring | Supports 1.8 V–5.0 V rails with 4% or 7% threshold options and 0.5% hysteresis - eliminates need for external resistive dividers. |
| Independent watchdog output (WDO) | Enables fault classification: WDO asserts on timeout while RESET stays high - supports graceful degradation strategies. |
| Watchdog disable via SET1 | Hardware-controlled disable avoids spurious timeouts during firmware update or bootloader execution - no software dependency. |
| VSON-8 wettable flanks | Facilitates automated AOI of solder joints - critical for zero-defect automotive manufacturing compliance. |
Applications
| ADAS Domain Controller | Vehicle Occupant Detection Sensor |
|---|---|
Use Scenario: Monitors 3.3 V and 5.0 V rails powering radar SoC, CAN transceivers, and sensor fusion processors in centralized ADAS compute units. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor - asserts RESET on supply droop and WDO on software hang detection. Use Value: Prevents silent MCU lockup by decoupling fault signaling (WDO) from hard reset (RESET), enabling diagnostic logging before reboot. |
Use Scenario: Supervises 1.8 V and 2.5 V supplies for capacitive occupancy sensing ASICs and low-power wake-up controllers in seat and dashboard modules. IC Role / Device Role / Timing Role: Precision undervoltage detector with 0.8% VITN accuracy - guarantees reset before ASIC brownout thresholds are violated. Use Value: Eliminates false occupancy triggers caused by marginal supply conditions during cold-cranking or load-dump events. |
| Automotive Front Camera ECU | Automotive DC/DC Converter Monitor |
Use Scenario: Ensures clean power-up sequencing and runtime supervision of image signal processor (ISP) and MIPI interface in front-facing camera modules. IC Role / Device Role / Timing Role: Dual-output supervisor - RESET coordinates ISP initialization; WDO monitors ISP firmware liveness via periodic WDI pulses. Use Value: Enables camera reinitialization without restarting the entire vehicle network - reduces ADAS downtime during transient faults. |
Use Scenario: Monitors output rail of 12 V-to-3.3 V buck converter supplying safety-critical microcontrollers in body control modules. IC Role / Device Role / Timing Role: High-accuracy (±0.8%) undervoltage detector with 0.5% hysteresis - rejects ripple-induced false resets on switching converter outputs. Use Value: Maintains BMS communication integrity during load transients by preventing unnecessary MCU resets during converter regulation dips. |
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 |
|---|---|---|---|
| TPS3851G18EQDRBRQ1 | Fixed 1.8 V undervoltage threshold (vs. 3.0 V for TPS3851G30EQDRBRQ1); identical watchdog, package, and accuracy specs. | Targeted for 1.8 V core rails in vision processors; not interchangeable without board-level voltage rail change. | Select only if supervising 1.8 V supply - same footprint and timing but different VITN calibration. |
| MAX6373KA29+T | ±2.5% VITN accuracy, no programmable watchdog, SOT-23-6 package, non-automotive grade (no AEC-Q100). | Limited to non-safety-critical consumer or industrial applications; lacks functional safety documentation and wettable flanks. | Use only for cost-sensitive, non-automotive designs where ±0.8% accuracy and ASIL support are not required. |
Compared with TPS3851G30EQDRBRQ1, the TPS3851G18EQDRBRQ1 offers identical automotive qualification and watchdog capability but targets 1.8 V rails, whereas the MAX6373KA29+T sacrifices accuracy, safety compliance, and watchdog flexibility for lower cost and smaller size in non-automotive use cases.
Availability
TPS3851G30EQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, vehicle occupant detection systems, and front camera ECUs requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for TPS3851G30EQDRBRQ1 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 automotive qualification expertise and broad functional safety infrastructure.
The TPS3851-Q1 product line delivers high-accuracy, AEC-Q100 qualified supervisors with integrated watchdog timers specifically engineered for ASIL-B capable automotive ECUs requiring precise power-rail monitoring and fault detection.
FAQ
What is the undervoltage threshold voltage of the TPS3851G30EQDRBRQ1?
The TPS3851G30EQDRBRQ1 has a factory-programmed undervoltage threshold (VITN) of 3.0 V, with ±0.8% accuracy over –40°C to +125°C. This value is laser-trimmed during production and applies to the VDD pin directly - no external resistor divider is needed. The device also provides 0.5% hysteresis to prevent oscillation near the threshold.
Does the TPS3851G30EQDRBRQ1 support both standard and extended watchdog timing modes?
Yes, the TPS3851G30EQDRBRQ1 supports both standard and extended watchdog timing, selected via part number suffix (S-Q1 vs. E-Q1). The TPS3851G30EQDRBRQ1 is the standard-timing variant, offering a typical watchdog timeout of 1600 ms when CWD is unconnected and SET1 is high. Extended timing variants require different orderable part numbers.
Can the watchdog timer in the TPS3851G30EQDRBRQ1 be disabled during firmware development?
Yes, the watchdog timer in the TPS3851G30EQDRBRQ1 can be fully disabled by grounding the SET1 pin. When SET1 = 0 V, the watchdog is inactive and WDI is ignored - eliminating unintended timeouts during debug, bootloader execution, or firmware updates. WDI must still be driven to VDD or GND to avoid increased IDD.
What package type and dimensions does the TPS3851G30EQDRBRQ1 use?
The TPS3851G30EQDRBRQ1 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 PCB ground plane. This package enables AOI-compatible assembly and meets automotive thermal requirements with RθJB = 22.2°C/W.
Is the TPS3851G30EQDRBRQ1 qualified for automotive safety applications under ISO 26262?
The TPS3851G30EQDRBRQ1 is Functional Safety-Capable: Texas Instruments provides a safety manual, FMEDA report, and FIT rate data to support ISO 26262 ASIL-B system integration. It is AEC-Q100 Grade 1 qualified (–40°C to +125°C), but final ASIL assignment depends on system-level architecture and fault handling - not solely on the component.
TPS3851G30EQDRBRQ1 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:
- 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)
TPS3851G30EQDRBRQ1 FAQ
1.How can I place an order for TPS3851G30EQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851G30EQDRBRQ1 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 TPS3851G30EQDRBRQ1 reliable?
The price and inventory of TPS3851G30EQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G30EQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851G30EQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G30EQDRBRQ1 transactions.
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4.How is shipping managed for TPS3851G30EQDRBRQ1?
TPS3851G30EQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851G30EQDRBRQ1 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 TPS3851G30EQDRBRQ1?
For technical support, including TPS3851G30EQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G30EQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851G30EQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851G30EQDRBRQ1 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 TPS3851G30EQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851G30EQDRBRQ1?
All TPS3851G30EQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G30EQDRBRQ1, 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 TPS3851G30EQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851G30EQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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