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Texas Instruments TPS3851G50SQDRBRQ1
- Part No.:
- TPS3851G50SQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851G50SQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3851G50SQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor with integrated programmable watchdog timer, featuring 0.8% undervoltage threshold accuracy (–40°C to +125°C), 200 ms ±15% reset timeout, and factory-programmed 1.6 s watchdog timeout (standard timing). It monitors 5.0 V rails in ADAS domain controllers and front camera power domains.
For engineers reviewing the TPS3851G50SQDRBRQ1 datasheet, TPS3851G50SQDRBRQ1 pinout, TPS3851G50SQDRBRQ1 application, or TPS3851G50SQDRBRQ1 equivalent, this device delivers precision undervoltage detection with 0.5% hysteresis, open-drain RESET/WDO outputs, manual reset input, and watchdog disable via SET1 - critical for functional safety-compliant automotive power sequencing and fault diagnostics.
Technical Context
The TPS3851G50SQDRBRQ1 implements a precision bandgap-based comparator for VITN = 4.8 V (±0.8%) with built-in 0.5% hysteresis, enabling stable operation in noisy automotive environments. Its dual-output architecture separates system reset (RESET) from fault signaling (WDO), allowing independent handling of power faults versus software hangs.
Watchdog timing is determined by CWD pin configuration: unconnected or pulled up to VDD enables factory-programmed 1.6 s (typ) timeout (standard timing); capacitor coupling enables user-adjustable timing. SET1 dynamically disables the watchdog, and WDI accepts falling-edge-triggered pulses with 150 µs setup time after enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VITN Threshold | 4.8 V ±0.8% (–40°C to +125°C) - precisely matches 5.0 V rail monitoring with margin for tolerance stack-up. |
| Reset Timeout (tRST) | 200 ms ±15% - ensures reliable microcontroller initialization before release, with tight tolerance for deterministic boot timing. |
| Watchdog Timeout (tWD) | 1.6 s (typ), 1.36–1.84 s (min–max) - factory-programmed standard timing for robust software supervision without external components. |
| Supply Current (IDD) | 10 µA (typ) - enables always-on monitoring in low-power automotive modules without impacting battery drain. |
| Hysteresis (VHYST) | 0.5% of VITN (24 mV at 4.8 V) - prevents chatter during slow-rising/falling supply transitions in DC/DC converter outputs. |
| Input Voltage Range | 1.6 V to 6.5 V - supports direct connection to 3.3 V, 5.0 V, and post-regulated rails across vehicle ECUs. |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for under-hood and cabin electronics assembly. |
Pinout & Package
TPS3851G50SQDRBRQ1 is housed in a 3.00 mm × 3.00 mm, 8-pin VSON package (DRB) 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 5.0 V rail input; requires 0.1 µF bypass capacitor for noise immunity in automotive switching environments. |
| GND | Ground reference | Common return for all internal circuits and thermal pad; connects directly to PCB ground plane for thermal and EMI control. |
| RESET | Open-drain reset output | Asserts low when VDD < 4.8 V; held low for 200 ms after recovery - drives MCU reset input with 1–100 kΩ pullup. |
| WDO | Open-drain watchdog output | Asserts low independently on watchdog timeout (only when RESET is high); enables fault isolation without full system reset. |
| MR | Manual reset input | Pulled up internally; logic-low pulse initiates reset - used for debug, firmware update, or external fault recovery. |
| WDI | Watchdog input | Falling-edge-triggered; must be pulsed before tWD expiry - interfaces directly with MCU GPIO without level-shifting. |
| CWD | Watchdog timing select | Unconnected or 10 kΩ pullup enables factory 1.6 s timeout; capacitor to GND enables user-programmable timing. |
| SET1 | Watchdog enable/disable | Grounded to disable watchdog (WDI ignored); high to enable - supports development mode and safety state transitions. |
Key Features
| Feature | Design Value |
|---|---|
| 0.8% VITN accuracy over –40°C to +125°C | Guarantees reliable undervoltage detection across full automotive ambient range without calibration or derating. |
| Independent WDO output | Signals watchdog timeout separately from RESET - allows diagnostic logging or graceful software recovery without hardware reset. |
| Factory-programmed 1.6 s watchdog (standard timing) | Eliminates external timing components and layout sensitivity while maintaining ±15% accuracy for ASIL-B systems. |
| Watchdog disable via SET1 | Enables safe development, bootloader operation, and functional safety state transitions without modifying WDI signal path. |
| Wettable flank VSON package | Supports automated AOI for solder joint integrity - critical for zero-defect manufacturing in automotive production lines. |
Applications
| Surround View System ECU | ADAS Domain Controller |
|---|---|
Use Scenario: Monitors 5.0 V power rail supplying image signal processors and SerDes links in multi-camera fusion units. IC Role / Device Role / Timing Role: Precision voltage supervisor and watchdog - ensures clean power-up sequencing and detects firmware lockups during real-time video processing. Use Value: 4.8 V threshold with 0.5% hysteresis prevents false resets from transient load steps; independent WDO enables error reporting to central ADAS host. |
Use Scenario: Supervises primary 5.0 V domain controller supply feeding SoC, CAN transceivers, and sensor interface ICs. IC Role / Device Role / Timing Role: Dual-function supervisory IC - provides deterministic 200 ms reset delay and 1.6 s watchdog timeout aligned with ASIL-B boot timing requirements. Use Value: Factory-programmed watchdog eliminates capacitor tolerance drift; wettable flanks ensure IPC-A-610 Class 3 solder joint verification. |
| Automotive Front Camera | Automotive DC/DC Converter |
Use Scenario: Secures power integrity for 5.0 V rail powering CMOS image sensor and ISP in forward-facing ADAS cameras. IC Role / Device Role / Timing Role: High-accuracy supervisor - triggers RESET if input drops below 4.8 V due to converter instability or cable loss. Use Value: 0.8% threshold accuracy avoids premature reset during cold-crank dips; MR pin supports field firmware recovery. |
Use Scenario: Monitors regulated 5.0 V output of buck converter supplying infotainment and telematics subsystems. IC Role / Device Role / Timing Role: Undervoltage detector with hysteresis - rejects noise-induced glitches while responding to true brownout events. Use Value: 24 mV hysteresis prevents oscillation during slow-rising output; 10 µA quiescent current minimizes no-load losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3851G50SQDRBTQ1 | Same electrical specs and pinout; tape-and-reel packaging (2500 pcs/reel vs. 3000 pcs/reel for DRBRQ1). | Identical functionality; selected for high-volume SMT line compatibility requiring different reel size. | Drop-in replacement for DRBRQ1 where packaging logistics require smaller reels. |
| TPS3851G50QDRCRQ1 | Same core functions but in 3 mm × 3 mm WSON package (no wettable flanks); identical VITN, tRST, tWD specs. | Lacks AOI-compatible wettable flanks; suitable for non-automotive or lower-reliability applications where optical inspection is not mandated. | Use only when wettable flanks are not required; not recommended for AEC-Q100 production lines needing AOI validation. |
Compared with TPS3851G50SQDRBRQ1, the DRBTQ1 variant offers identical performance in alternate packaging for reel optimization, while the DRCRQ1 lacks wettable flanks - making DRBRQ1 the sole choice for automotive production requiring AOI-verified solder joints.
Availability
TPS3851G50SQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround-view ECUs, and front camera modules requiring stable component supply with AEC-Q100 qualification and functional safety documentation support.
Supply support for TPS3851G50SQDRBRQ1 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 automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The TPS3851-Q1 product line delivers high-accuracy, AEC-Q100 qualified supervisors with integrated watchdog timers specifically for functional safety-critical automotive power management in ADAS, infotainment, and body electronics.
FAQ
What is the exact undervoltage threshold voltage for TPS3851G50SQDRBRQ1?
The TPS3851G50SQDRBRQ1 has a nominal undervoltage threshold (VITN) of 4.8 V with ±0.8% accuracy over –40°C to +125°C. This value is factory-trimmed and confirmed in TI's SBVS286B datasheet Section 5.5, making it suitable for precise 5.0 V rail monitoring in automotive applications where tight tolerance margins are required.
Does TPS3851G50SQDRBRQ1 support both standard and extended watchdog timing modes?
No - TPS3851G50SQDRBRQ1 implements only the standard timing mode, delivering a factory-programmed watchdog timeout of 1.6 s (typical), with min/max of 1.36 s and 1.84 s. Extended timing (e.g., up to 77 s) is available only in variants ending in "E-Q1", such as TPS3851G50EQDRBRQ1, not in the "G50S" suffix of TPS3851G50SQDRBRQ1.
How is the watchdog timer disabled on TPS3851G50SQDRBRQ1?
The watchdog timer on TPS3851G50SQDRBRQ1 is disabled by grounding the SET1 pin. When SET1 = 0 V, WDI is ignored and WDO remains high-impedance regardless of input activity. This feature is explicitly documented in Section 6.3.4.4 and Table 7-1 of the datasheet, supporting safe development and functional safety state transitions.
What package type and dimensions does TPS3851G50SQDRBRQ1 use?
TPS3851G50SQDRBRQ1 uses the DRB package: an 8-pin VSON measuring 3.00 mm × 3.00 mm with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a PCB ground plane. This package is specified in TI's official orderable addendum and mechanical drawing SLVU220.
Is TPS3851G50SQDRBRQ1 qualified for automotive applications?
Yes - TPS3851G50SQDRBRQ1 is AEC-Q100 qualified (Grade 1: –40°C to +125°C ambient), with HBM ESD rating of ±4 kV and CDM rating of ±1 kV. It also carries functional safety capability documentation per ISO 26262, as stated in Section 1 (Features) and Section 8 of the SBVS286B datasheet.
TPS3851G50SQDRBRQ1 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:
- 5V
- 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)
TPS3851G50SQDRBRQ1 FAQ
1.How can I place an order for TPS3851G50SQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851G50SQDRBRQ1 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 TPS3851G50SQDRBRQ1 reliable?
The price and inventory of TPS3851G50SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G50SQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851G50SQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G50SQDRBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3851G50SQDRBRQ1?
TPS3851G50SQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851G50SQDRBRQ1 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 TPS3851G50SQDRBRQ1?
For technical support, including TPS3851G50SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G50SQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851G50SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851G50SQDRBRQ1 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 TPS3851G50SQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851G50SQDRBRQ1?
All TPS3851G50SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G50SQDRBRQ1, 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 TPS3851G50SQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851G50SQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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