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Texas Instruments TPS3851H33EQDRBRQ1
- Part No.:
- TPS3851H33EQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851H33EQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,366
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Product details
Overview
TPS3851H33EQDRBRQ1 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 open-drain RESET/WDO outputs - used for reliable power-on reset and fault detection in ADAS domain controllers and front camera modules.
For engineers reviewing the TPS3851H33EQDRBRQ1 datasheet, TPS3851H33EQDRBRQ1 pinout, TPS3851H33EQDRBRQ1 application, or TPS3851H33EQDRBRQ1 equivalent, key selection considerations include factory-programmed 1.6 s watchdog timeout (SET1 = 1, CWD unconnected), 1.6 V to 6.5 V supply range, 10 µA typical supply current, and 3 mm × 3 mm VSON-8 wettable flank package compatibility with automotive PCB inspection requirements.
Technical Context
The TPS3851H33EQDRBRQ1 implements a precision bandgap-based voltage comparator with 0.5% hysteresis and a state-machine-controlled watchdog timer that supports both factory-programmed (1.6 s standard timing) and capacitor-adjustable timeout modes. Its dual open-drain outputs - RESET and WDO - operate independently: RESET asserts on VDD undervoltage or MR low, while WDO asserts only when watchdog timeout occurs and RESET is deasserted.
Functional safety support includes documentation for ISO 26262 ASIL-B system integration, and the device operates across –40°C to +125°C ambient with AEC-Q100 HBM ±4 kV / CDM ±1 kV ESD ratings. The SET1 pin enables dynamic watchdog enable/disable, and CWD pin evaluation (381 µs) determines timing mode at power-up based on external RC configuration or pullup state.
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, 3.3 V, and 5.0 V rails without external dividers. |
| VITN Accuracy | ±0.8% over –40°C to +125°C - ensures reliable reset assertion before microcontroller minimum supply tolerance is violated. |
| tRST | 200 ms ±15% - fixed reset timeout guarantees deterministic MCU initialization window after power stabilization. |
| Watchdog Timeout | 1600 ms typ (standard timing, CWD NC, SET1 = 1) - factory-programmed high-precision timing eliminates external timing components. |
| IDD | 10 µA typical - ultra-low quiescent current extends battery life in always-on automotive modules. |
| Hysteresis | 0.5% - prevents chatter during slow-rising/falling VDD transitions in noisy automotive environments. |
| Package | VSON-8 (3.0 mm × 3.0 mm) with wettable flanks - enables automated optical inspection (AOI) of solder joints per IPC-A-610. |
Pinout & Package
VSON-8 package (3.00 mm × 3.00 mm) with exposed thermal pad connected internally to GND; wettable flanks support AOI-compatible reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply input | Monitored rail input; requires 0.1 µF bypass capacitor for noise immunity in automotive transients. |
| CWD | Watchdog timing select | Determines timeout mode: unconnected → factory-programmed 1.6 s; capacitor to GND → user-adjustable timing. |
| MR | Manual reset input | Active-low asynchronous reset trigger; internally pulled up - can be left floating if unused. |
| GND | Ground reference | Primary return path; thermal pad must connect to large-area ground plane for thermal and EMI performance. |
| SET1 | Watchdog enable control | Logic low disables watchdog; logic high enables - allows safe disable during firmware development. |
| WDI | Watchdog input | Falling-edge-triggered; must be driven to VDD or GND at all times to avoid IDD increase from intermediate voltages. |
| WDO | Watchdog output | Open-drain fault indicator; asserts low only when watchdog times out AND RESET is high - enables non-reset fault signaling. |
| RESET | Reset output | Open-drain system reset signal; asserts low on VDD undervoltage, MR low, or power-on reset - requires external pullup. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±4 kV / CDM ±1 kV ESD robustness - meets automotive reliability requirements. |
| 0.8% VITN accuracy over temperature | Guarantees reset assertion within tight voltage margins of modern SoCs and MCUs, eliminating need for margin-based design derating. |
| Independent WDO output | Enables fault diagnostics without full system reset - e.g., logging watchdog timeout events while maintaining MCU operation. |
| Factory-programmed watchdog timing | 1600 ms typical timeout with ±15% accuracy removes capacitor tolerance and temperature drift concerns in production systems. |
| Wettable flank VSON-8 package | Supports automated optical inspection of solder joints - critical for zero-defect manufacturing in safety-critical ADAS applications. |
Applications
| ADAS Domain Controller | Automotive Front Camera |
|---|---|
Use Scenario: Monitors 3.3 V core supply and 1.8 V I/O rail in centralized ADAS compute unit with multi-core SoC. IC Role / Device Role / Timing Role: Primary power-on reset generator and watchdog supervisor - asserts RESET on undervoltage, provides independent WDO for SoC-level fault isolation. Use Value: Prevents boot failure due to slow-rising 3.3 V rail; 0.5% hysteresis avoids false resets during load transients; 1600 ms watchdog timeout aligns with SoC firmware initialization sequence. |
Use Scenario: Ensures clean startup and runtime supervision of image sensor and ISP in forward-facing camera module. IC Role / Device Role / Timing Role: Dual-rail supervisor (3.3 V analog, 1.8 V digital) with manual reset for field firmware updates. Use Value: 0.8% VITN accuracy guarantees reset before ISP brownout; MR pin enables safe recovery from corrupted firmware; wettable flanks ensure solder joint reliability in vibration-prone mounting locations. |
| Surround View System ECU | Vehicle Occupant Detection Sensor |
Use Scenario: Supervises 5.0 V power rail and 3.3 V logic supply in multi-camera surround-view electronic control unit. IC Role / Device Role / Timing Role: Centralized reset coordinator with independent WDO for camera link health monitoring. Use Value: Open-drain RESET and WDO outputs allow wired-OR connection across multiple subsystems; 10 µA IDD minimizes impact on always-on battery drain. |
Use Scenario: Provides fail-safe reset and watchdog supervision for capacitive occupant sensing MCU in seat-back modules. IC Role / Device Role / Timing Role: Low-power voltage supervisor with configurable watchdog - monitors 3.3 V MCU supply and enables diagnostic logging via WDO. Use Value: 200 ms tRST matches MCU boot ROM timing; SET1 pin allows watchdog disable during calibration sequences; VSON-8 footprint fits space-constrained seat electronics. |
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 |
|---|---|---|---|
| TPS3851G33EQDRBRQ1 | Same package and pinout; factory-programmed 3.3 V threshold (VITN = 3.3 V), identical 0.8% accuracy and watchdog timing. | Designed for 3.3 V rail monitoring only; TPS3851H33EQDRBRQ1 supports 3.3 V with 4% or 7% undervoltage hysteresis options. | Select TPS3851H33EQDRBRQ1 when system requires configurable hysteresis or tighter tolerance on 3.3 V rail. |
| MAX6373KA33+T | Fixed 3.3 V threshold, ±1.5% accuracy, no programmable watchdog - only basic reset with 200 ms timeout. | Lacks independent WDO output and watchdog disable feature; not AEC-Q100 qualified. | Use only in non-safety-critical, cost-sensitive applications where watchdog functionality is unnecessary. |
Compared with TPS3851G33EQDRBRQ1, the TPS3851H33EQDRBRQ1 offers selectable 4%/7% hysteresis for improved noise immunity on 3.3 V rails, while MAX6373KA33+T lacks functional safety support, watchdog flexibility, and automotive qualification - making TPS3851H33EQDRBRQ1 the sole option meeting ASIL-B system requirements.
Availability
TPS3851H33EQDRBRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive front camera modules, surround view ECUs, and vehicle occupant detection sensors requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for TPS3851H33EQDRBRQ1 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, AEC-Q100-compliant supervisory circuits with integrated watchdog timers - designed specifically for safety-critical automotive applications including ADAS, infotainment, and body electronics.
FAQ
What is the undervoltage threshold voltage for TPS3851H33EQDRBRQ1?
The TPS3851H33EQDRBRQ1 is configured for 3.3 V nominal supply monitoring with a precise undervoltage threshold (VITN) of 3.3 V ±0.8% over –40°C to +125°C. It supports two hysteresis options - 4% or 7% - selectable via external resistor network on the SET1 pin, enabling robust operation on noisy 3.3 V rails in automotive environments.
Does TPS3851H33EQDRBRQ1 support watchdog timer disable during firmware development?
Yes, TPS3851H33EQDRBRQ1 supports dynamic watchdog disable via the SET1 pin: grounding SET1 disables the watchdog timer and ignores WDI input, preventing unintended timeouts during debug or firmware update cycles. When disabled, WDI must be driven to VDD or GND to avoid increased supply current.
What is the reset timeout duration for TPS3851H33EQDRBRQ1 and how accurate is it?
The TPS3851H33EQDRBRQ1 features a fixed reset timeout (tRST) of 200 ms with ±15% accuracy over temperature and voltage. This high-precision delay ensures deterministic MCU initialization timing after power stabilization, eliminating reliance on external RC networks or software delays.
How does the CWD pin configure watchdog timing on TPS3851H33EQDRBRQ1?
The CWD pin on TPS3851H33EQDRBRQ1 selects watchdog mode at power-up: unconnected or pulled to VDD via 10 kΩ resistor enables factory-programmed 1600 ms standard timing; connection to ground via capacitor enables user-adjustable timeout using a 375 nA constant-current source and VCWD = 1.21 V threshold.
Is TPS3851H33EQDRBRQ1 qualified for automotive use and what standards does it meet?
Yes, TPS3851H33EQDRBRQ1 is AEC-Q100 Grade 1 qualified for –40°C to +125°C ambient operation, with HBM ±4 kV and CDM ±1 kV ESD ratings. It is functional safety-capable with documentation supporting ISO 26262 ASIL-B system integration - validated for use in ADAS, front camera, and domain controller applications.
TPS3851H33EQDRBRQ1 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
- Supplier Device Package:
- 8-SON (3x3)
TPS3851H33EQDRBRQ1 FAQ
1.How can I place an order for TPS3851H33EQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851H33EQDRBRQ1 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 TPS3851H33EQDRBRQ1 reliable?
The price and inventory of TPS3851H33EQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851H33EQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851H33EQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851H33EQDRBRQ1 transactions.
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4.How is shipping managed for TPS3851H33EQDRBRQ1?
TPS3851H33EQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851H33EQDRBRQ1 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 TPS3851H33EQDRBRQ1?
For technical support, including TPS3851H33EQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851H33EQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851H33EQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851H33EQDRBRQ1 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 TPS3851H33EQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851H33EQDRBRQ1?
All TPS3851H33EQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851H33EQDRBRQ1, 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 TPS3851H33EQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851H33EQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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