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Texas Instruments TPS3851G18EQDRBRQ1
- Part No.:
- TPS3851G18EQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851G18EQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TPS3851G18EQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor with integrated programmable watchdog timer, featuring 0.8% VITN threshold accuracy (–40°C to +125°C), 200 ms ±15% reset timeout (tRST), and open-drain RESET/WDO outputs. It monitors 1.8 V supply rails in ADAS domain controllers and front camera modules, delivering precision undervoltage detection with 0.5% hysteresis and factory-programmed watchdog timing.
For engineers reviewing the TPS3851G18EQDRBRQ1 datasheet, TPS3851G18EQDRBRQ1 pinout, TPS3851G18EQDRBRQ1 application, or TPS3851G18EQDRBRQ1 equivalent, key selection criteria include its ±0.8% voltage threshold accuracy over temperature, dual-output fault signaling (RESET + WDO), manual reset (MR) support, watchdog disable via SET1, and wettable-flank 3mm × 3mm VSON package for automated optical inspection in automotive PCB assembly.
Technical Context
The TPS3851G18EQDRBRQ1 implements a precision bandgap-based comparator for undervoltage monitoring with 0.8% VITN accuracy and 0.5% hysteresis, enabling reliable reset assertion before microcontroller brownout. Its dual-output architecture separates system reset (RESET) from watchdog fault indication (WDO), allowing independent handling of power faults versus software hangs.
Watchdog timing is configurable via CWD pin: capacitor-based (0.1–1000 nF) for user-adjustable timeouts, or factory-programmed defaults (1600 ms standard / 200 ms extended) selected by SET1 logic state and CWD pullup/unconnected configuration - all validated across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VITN Threshold | 1.728 V ±0.8% (–40°C to +125°C); precisely matches 1.8 V rail with 4% undervoltage margin |
| tRST Reset Delay | 200 ms ±15%; ensures stable MCU initialization after power-up or brownout recovery |
| IDD Supply Current | 10 µA typical; enables always-on supervision in low-power automotive ECU sleep modes |
| VDD Range | 1.6 V to 6.5 V; supports direct connection to 1.8 V, 2.5 V, 3.3 V, and 5 V rails without external regulators |
| Hysteresis | 0.5% of VITN; prevents oscillatory reset assertion in noisy automotive power environments |
| Watchdog Timeout | 1600 ms (standard) or 200 ms (extended) factory-programmed; selectable via SET1/CWD configuration |
| ESD Rating | HBM ±4 kV, CDM ±1 kV; meets AEC-Q100-002/-011 for robustness in automotive manufacturing and field operation |
Pinout & Package
TPS3851G18EQDRBRQ1 is housed in a 3.00 mm × 3.00 mm, 8-pin VSON (DRB) package with wettable flanks for solder-joint 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 (Pin 1) | Power supply input | Accepts 1.6–6.5 V; requires 0.1 µF bypass capacitor near pin for noise immunity |
| CWD (Pin 2) | Watchdog timing control | Configures timeout via capacitor (0.1–1000 nF) or selects factory defaults via 10 kΩ pullup/unconnected |
| MR (Pin 3) | Manual reset input | Active-low; internally pulled up; asserts RESET when driven low, with 200 ns propagation delay |
| GND (Pin 4) | Ground reference | Primary return path; thermal pad connects internally to this node |
| SET1 (Pin 5) | Watchdog enable/disable | Ground = watchdog disabled; VDD = enabled; dynamic switching supported with 150 µs setup time |
| WDI (Pin 6) | Watchdog input | Falling-edge triggered; must be driven to VDD or GND (not floating) to avoid increased IDD |
| WDO (Pin 7) | Watchdog output | Open-drain; asserts low for tRST duration only when RESET is high - enables fault isolation without full reset |
| RESET (Pin 8) | System reset output | Open-drain; asserts low during VDD < VITN, remains low for tRST after VDD recovery |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent outputs | Separate RESET (system reset) and WDO (watchdog fault) signals enable granular fault response - e.g., log error without rebooting MCU |
| Factory-programmed watchdog | 1600 ms (standard) or 200 ms (extended) timing with ±15% accuracy eliminates external timing components and calibration effort |
| 0.8% VITN accuracy over temperature | Guarantees reliable reset assertion at 1.728 V ±13.8 mV across –40°C to +125°C, critical for 1.8 V SoC brownout prevention |
| Wettable-flank VSON package | Enables automated optical inspection (AOI) of solder joints on bottom-side terminations - essential for automotive zero-defect manufacturing |
| Watchdog disable via SET1 | Hardware-controlled disable allows safe development/debugging without modifying firmware or risking spurious timeouts |
Applications
| ADAS Domain Controller | Automotive Front Camera |
|---|---|
Use Scenario: Monitors primary 1.8 V core supply in centralized ADAS compute unit with multi-core SoC and safety-critical ASIL-B software stack. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor; asserts RESET before SoC brownout and flags software hang via WDO without resetting vision pipeline. Use Value: Prevents silent data corruption by ensuring deterministic reset under supply sag while enabling non-intrusive watchdog diagnostics during functional safety validation. |
Use Scenario: Supervises 1.8 V image sensor and ISP power rail in forward-facing camera module operating in engine bay temperature extremes. IC Role / Device Role / Timing Role: Precision undervoltage detector with 0.5% hysteresis; provides 200 ms reset delay for stable sensor initialization and separate WDO signal for firmware health monitoring. Use Value: Eliminates false resets from transient load dumps while supporting ISO 26262 diagnostic coverage through dual-output fault signaling. |
| Surround View System ECU | Vehicle Occupant Detection Sensor |
Use Scenario: Ensures reliable boot and runtime supervision of 1.8 V microcontroller in 360° camera fusion ECU with CAN FD and Ethernet interfaces. IC Role / Device Role / Timing Role: High-accuracy supervisor with MR input for service-mode reset; factory-programmed 1600 ms watchdog timeout aligns with complex boot sequence timing. Use Value: Guarantees ASIL-B compliant power sequencing and enables field-service reset without physical access to reset button. |
Use Scenario: Supervises 1.8 V supply to capacitive occupant detection ASIC in seat-back electronics exposed to cabin temperature cycling. IC Role / Device Role / Timing Role: Low-quiescent-current (10 µA) supervisor with wettable-flank VSON package; supports long-term reliability in thermally constrained space. Use Value: Meets automotive lifetime requirements with zero maintenance while enabling AOI for zero-defect solder joint verification. |
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 |
|---|---|---|---|
| TPS3851G50EQDRBRQ1 | Fixed 4.8 V VITN threshold (±0.8%), same package and features | Targets 5 V rails instead of 1.8 V; not suitable for 1.8 V SoC monitoring | Select only if supervising 5 V supplies; identical footprint and timing but incompatible threshold |
| TLV809E18DBVR | Single-output (RESET only), no watchdog, ±2% threshold accuracy, SOT-23-3 package | Lacks WDO output and programmable watchdog; lower accuracy limits use in tight-tolerance systems | Use only for cost-sensitive, non-safety-critical 1.8 V supervision where watchdog functionality is unnecessary |
Compared with TPS3851G50EQDRBRQ1 and TLV809E18DBVR, the TPS3851G18EQDRBRQ1 uniquely delivers 1.8 V-specific ±0.8% accuracy, dual-output fault signaling, and AEC-Q100 Grade 1 qualification - making it the only option meeting ASIL-B requirements for 1.8 V ADAS subsystems.
Availability
TPS3851G18EQDRBRQ1 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 with full AEC-Q100 traceability and long-term production support.
Supply support for TPS3851G18EQDRBRQ1 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 in functional safety and AEC-Q100-compliant design.
The TPS3851-Q1 product line delivers high-accuracy, watchdog-integrated voltage supervisors engineered specifically for ASIL-B automotive applications including ADAS, infotainment, and body electronics - emphasizing precision, reliability, and testability.
FAQ
What is the exact undervoltage threshold voltage for TPS3851G18EQDRBRQ1?
The TPS3851G18EQDRBRQ1 has a nominal undervoltage threshold (VITN) of 1.728 V, with guaranteed accuracy of ±0.8% over –40°C to +125°C ambient temperature. This value is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet (SBVS286B), making it suitable for precise supervision of 1.8 V rails where even minor deviations could trigger unintended resets.
Does TPS3851G18EQDRBRQ1 support both reset and watchdog functions simultaneously?
Yes, the TPS3851G18EQDRBRQ1 supports concurrent reset and watchdog operation: RESET asserts when VDD falls below 1.728 V, while WDO independently signals watchdog timeout events - but only when RESET is deasserted (high). This dual-output behavior enables differentiated fault responses, such as logging a software hang without initiating a full system reset.
How is watchdog timeout configured on TPS3851G18EQDRBRQ1?
Watchdog timeout on TPS3851G18EQDRBRQ1 is configured via the CWD pin: connecting a capacitor (0.1–1000 nF) to GND enables user-programmable timing, while leaving CWD unconnected or pulling it to VDD via 10 kΩ selects factory-programmed defaults - 1600 ms (standard) or 200 ms (extended) - determined by the logic state of the SET1 pin as documented in Table 7-1 of the datasheet.
What package type and dimensions does TPS3851G18EQDRBRQ1 use?
TPS3851G18EQDRBRQ1 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 large-area ground plane per TI's layout guidelines (Section 7.4) to ensure proper thermal performance and AOI compatibility.
Is TPS3851G18EQDRBRQ1 qualified for automotive applications?
Yes, TPS3851G18EQDRBRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ±4 kV and CDM ±1 kV ESD ratings. It is explicitly designed for automotive safety-critical systems and includes functional safety documentation to support ISO 26262 ASIL-B development workflows, as confirmed in Section 1 (Features) and Section 8 of the SBVS286B datasheet.
TPS3851G18EQDRBRQ1 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)
TPS3851G18EQDRBRQ1 FAQ
1.How can I place an order for TPS3851G18EQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851G18EQDRBRQ1 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 TPS3851G18EQDRBRQ1 reliable?
The price and inventory of TPS3851G18EQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G18EQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851G18EQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G18EQDRBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3851G18EQDRBRQ1?
TPS3851G18EQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851G18EQDRBRQ1 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 TPS3851G18EQDRBRQ1?
For technical support, including TPS3851G18EQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G18EQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851G18EQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851G18EQDRBRQ1 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 TPS3851G18EQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851G18EQDRBRQ1?
All TPS3851G18EQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G18EQDRBRQ1, 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 TPS3851G18EQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851G18EQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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