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Texas Instruments TPS3851H30EQDRBRQ1
- Part No.:
- TPS3851H30EQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851H30EQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
TPS3851H30EQDRBRQ1 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, 10 µA typical supply current, and dual open-drain outputs (RESET/WDO) for microcontroller supervision in ADAS domain controllers.
For engineers reviewing the TPS3851H30EQDRBRQ1 datasheet, TPS3851H30EQDRBRQ1 pinout, TPS3851H30EQDRBRQ1 application, or TPS3851H30EQDRBRQ1 equivalent, this device supports precision rail monitoring (1.8V–5.0V), factory-programmed or capacitor-adjustable watchdog timing, manual reset input, and watchdog disable via SET1 - critical for functional safety–compliant automotive power sequencing and fault diagnostics.
Technical Context
The TPS3851H30EQDRBRQ1 implements a precision bandgap-based comparator with 0.5% hysteresis for stable undervoltage detection and a state-machine-driven watchdog timer with dual timing modes (standard/extended). Its RESET output asserts when VDD falls below VITN and holds low for tRST = 200 ms after VDD recovers above VITN + VHYST.
Watchdog operation is configurable via CWD (capacitor or 10 kΩ pullup) and SET1 (enable/disable), with WDI edge-triggered input and independent WDO output that asserts only when RESET is high - enabling fault isolation without full system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 1.6 V to 6.5 V - supports direct connection to common automotive rails including 3.3 V and 5.0 V systems without external regulation. |
| VITN Accuracy | ±0.8% over –40°C to +125°C - ensures reliable reset assertion before microcontroller VDD minimum tolerance is violated. |
| tRST | 200 ms ±15% - fixed, high-precision reset delay enables deterministic boot timing in safety-critical ECUs. |
| IDD | 10 µA typical - ultra-low quiescent current extends battery life in always-on automotive modules. |
| Watchdog Timeout | 1600 ms typical (CWD NC, SET1 = 1) - factory-programmed standard timing provides jitter-free fault detection without external components. |
| Hysteresis | 0.5% - prevents chatter during slow-rising/falling supply transitions in noisy vehicle electrical environments. |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for under-hood and cabin electronics. |
Pinout & Package
TPS3851H30EQDRBRQ1 uses 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 | Primary power rail input; requires 0.1 µF bypass capacitor near pin for noise immunity in automotive transients. |
| GND | Ground reference | Common return path for all internal circuitry and thermal pad; must be low-impedance connection to PCB ground plane. |
| MR | Manual reset input | Active-low logic input with internal 620 nA pullup; initiates RESET assertion independently of VDD condition. |
| SET1 | Watchdog enable/disable control | Logic input: grounded → watchdog disabled; >0.8×VDD → watchdog enabled; allows safe development mode operation. |
| CWD | Watchdog timing configuration | Capacitor input (0.1–1000 nF) or 10 kΩ pullup to VDD selects user-programmable or factory-set timeout values. |
| WDI | Watchdog trigger input | Falling-edge sensitive; must be pulsed before tWD(min) to prevent WDO assertion; ignored when RESET is low. |
| WDO | Watchdog output | Open-drain fault flag; asserts low only when RESET is high - enables diagnostic logging without system reset. |
| RESET | Supervisor reset output | Open-drain primary reset signal; drives microcontroller /SoC reset pin; requires external 1–100 kΩ pullup to correct VPU rail. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, meeting automotive ECU reliability and lifetime requirements. |
| Functional Safety-Capable documentation | TI provides FIT rate data, failure mode analysis, and safety manual to support ISO 26262 ASIL-B system integration. |
| Precision undervoltage monitoring | Supports 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V rails with 0.8% VITN accuracy and 0.5% hysteresis - eliminates need for external trimming. |
| Dual independent outputs | Separate RESET and WDO pins allow independent handling of power-fail recovery and software-execution faults. |
| Watchdog disable via SET1 | Hardware-controlled watchdog disable enables safe firmware development and debug without risk of spurious timeouts. |
Applications
| Surround View System ECU | ADAS Domain Controller |
|---|---|
Use Scenario: Monitors 3.3 V and 5.0 V rails powering image signal processors and Ethernet switches in multi-camera fusion units. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor ensuring deterministic boot and runtime fault detection for ASIL-B compliant vision processing. Use Value: Prevents silent corruption by asserting RESET before SoC VDD drops below operational spec, while WDO flags software hangs without disrupting camera streaming. |
Use Scenario: Supervises power rails for heterogeneous compute clusters (Cortex-A72, GPU, AI accelerators) in centralized ADAS platforms. IC Role / Device Role / Timing Role: High-accuracy reset generator with programmable watchdog providing fail-safe startup sequencing and runtime health monitoring. Use Value: 0.8% VITN accuracy guarantees reset occurs within 12 mV of 3.3 V rail's 3.288 V min spec, avoiding premature resets or undetected brownouts. |
| Automotive Front Camera Module | Vehicle Occupant Detection Sensor |
Use Scenario: Ensures reliable power-up and continuous supervision of 1.8 V image sensor core and 2.8 V analog front-end in compact camera housings. IC Role / Device Role / Timing Role: Compact voltage supervisor with integrated watchdog delivering space-efficient, single-chip power integrity management. Use Value: 3 mm × 3 mm VSON package with wettable flanks enables AOI-compatible assembly in tight-form-factor modules. |
Use Scenario: Supervises 5.0 V supply to capacitive sensing ASIC and 3.3 V rail to MCU in seat-mounted occupant classification systems. IC Role / Device Role / Timing Role: Dual-threshold supervisor supporting both 5.0 V and 3.3 V rails with shared reset timing and independent watchdog signaling. Use Value: Factory-programmed 1600 ms watchdog timeout matches typical MCU firmware initialization window, reducing false positives during cold start. |
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 | Fixed 3.3 V undervoltage threshold (VITN = 3.3 V); same 0.8% accuracy, 200 ms tRST, and watchdog architecture. | Optimized for single-rail 3.3 V systems; lacks multi-threshold flexibility of TPS3851H30EQDRBRQ1's 3.0 V option. | Select when supervising only 3.3 V rails and board space permits identical footprint. |
| MAX6373KA29+T | 2.93 V fixed threshold, ±1.5% accuracy, no programmable watchdog; 12 µA IDD, SOIC-8 package. | Lower accuracy and no WDO output limits use in ASIL-B systems; suitable for non-safety-critical body electronics. | Choose for cost-sensitive, non-functional-safety applications where 3.0 V rail supervision is not required. |
Compared with TPS3851H30EQDRBRQ1, the TPS3851G33EQDRBRQ1 offers identical performance at 3.3 V but no 3.0 V option, while the MAX6373KA29+T lacks watchdog programmability and functional safety support - making TPS3851H30EQDRBRQ1 the only choice for ASIL-B-compliant 3.0 V rail supervision with diagnostic WDO capability.
Availability
TPS3851H30EQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround view ECUs, and vehicle occupant detection sensors requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TPS3851H30EQDRBRQ1 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 qualified supervisors with integrated watchdog timers specifically designed for ASIL-B automotive systems requiring deterministic power sequencing and runtime fault detection.
FAQ
What is the undervoltage threshold voltage for TPS3851H30EQDRBRQ1?
The TPS3851H30EQDRBRQ1 has a nominal undervoltage threshold (VITN) of 3.0 V, with ±0.8% accuracy over –40°C to +125°C. This means the actual trip point remains within 29.76 mV of 3.0 V across its full operating temperature range, ensuring robust reset behavior for 3.0 V rails in automotive environments.
Does TPS3851H30EQDRBRQ1 support both 3.0 V and 3.3 V rail supervision?
No - TPS3851H30EQDRBRQ1 is factory-configured for 3.0 V undervoltage supervision only. The 'H30' in the part number denotes the 3.0 V threshold variant. For 3.3 V supervision, the TPS3851G33EQDRBRQ1 is the functionally identical counterpart with 3.3 V VITN.
How is the watchdog timeout configured on TPS3851H30EQDRBRQ1?
The TPS3851H30EQDRBRQ1 watchdog timeout is configured using the CWD pin: leaving it unconnected or pulling it up to VDD via 10 kΩ selects the factory-programmed 1600 ms (typical) standard timing; connecting a capacitor (0.1–1000 nF) to GND enables user-adjustable timing per TI's equations.
Can TPS3851H30EQDRBRQ1 be used in non-automotive applications?
Yes - while AEC-Q100 qualified and optimized for automotive, the TPS3851H30EQDRBRQ1's 1.6–6.5 V operation, 10 µA supply current, and precision supervision make it suitable for industrial and medical systems requiring high-reliability power monitoring, provided functional safety documentation is not required.
What is the purpose of the SET1 pin on TPS3851H30EQDRBRQ1?
The SET1 pin on TPS3851H30EQDRBRQ1 controls watchdog enable/disable: grounding SET1 disables the watchdog timer and ignores WDI input, allowing safe firmware development; pulling SET1 high enables normal watchdog operation with 150 µs setup time before WDI becomes active.
TPS3851H30EQDRBRQ1 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
- Supplier Device Package:
- 8-SON (3x3)
TPS3851H30EQDRBRQ1 FAQ
1.How can I place an order for TPS3851H30EQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851H30EQDRBRQ1 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 TPS3851H30EQDRBRQ1 reliable?
The price and inventory of TPS3851H30EQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851H30EQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851H30EQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851H30EQDRBRQ1 transactions.
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TPS3851H30EQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851H30EQDRBRQ1 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 TPS3851H30EQDRBRQ1?
For technical support, including TPS3851H30EQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851H30EQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851H30EQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851H30EQDRBRQ1 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 TPS3851H30EQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851H30EQDRBRQ1?
All TPS3851H30EQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851H30EQDRBRQ1, 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 TPS3851H30EQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851H30EQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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