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Texas Instruments TPS3851H50SQDRBRQ1
- Part No.:
- TPS3851H50SQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851H50SQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
TPS3851H50SQDRBRQ1 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 fault detection and safe startup in ADAS domain controllers and front camera power rails.
For engineers reviewing the TPS3851H50SQDRBRQ1 datasheet, TPS3851H50SQDRBRQ1 pinout, TPS3851H50SQDRBRQ1 application, or TPS3851H50SQDRBRQ1 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 required for automotive ECU design validation.
Technical Context
The TPS3851H50SQDRBRQ1 implements a precision bandgap-based comparator for undervoltage monitoring with 0.8% VITN accuracy across –40°C to +125°C and 0.5% hysteresis, enabling reliable reset assertion before microcontroller supply tolerance violation. Its dual-output architecture separates system reset (RESET) from fault diagnostics (WDO), allowing independent handling of brownout and software hang events.
Watchdog functionality supports three configuration modes: capacitor-programmable timing (0.704 ms to 77.45 s), factory-set standard timing (1600 ms typ), or factory-set extended timing (200 ms typ), all selectable via CWD and SET1 pins. The device enters defined functional states based on VDD relative to VPOR (0.8 V), VITN (4.8 V for H50 variant), and VITN + VHYST, with glitch immunity up to 25 ps at 10% overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VITN Threshold | 4.8 V ± 0.8% - precisely monitors 5.0 V rail with margin for tight-tolerance SoC supply requirements |
| Reset Timeout (tRST) | 200 ms ± 15% - ensures sufficient hold time for microcontroller initialization before release |
| Supply Current (IDD) | 10 µA typical - enables always-on supervision without compromising low-power ECU sleep modes |
| Hysteresis (VHYST) | 0.5% of VITN - prevents oscillation during slow-rising/falling supply transitions in noisy automotive environments |
| Watchdog Timeout (tWD) | 1600 ms typical (factory-programmed, SET1 = 1, CWD unconnected) - matches typical firmware watchdog window for ADAS processors |
| Operating Temp Range | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and cabin-mounted ECUs |
| ESD Rating | HBM ±4 kV, CDM ±1 kV - meets automotive robustness requirements for assembly and field operation |
Pinout & Package
TPS3851H50SQDRBRQ1 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 | Power supply input | Accepts 1.6 V to 6.5 V; requires 0.1 µF bypass capacitor near pin for noise immunity in automotive DC/DC output rails |
| GND | Ground reference | Common return for internal circuitry and thermal pad; connects directly to PCB ground plane |
| MR | Manual reset input | Active-low logic input with internal 620 nA pullup; asserts RESET when pulled low, used for external processor-initiated recovery |
| SET1 | Watchdog enable/disable control | Logic input: grounded disables watchdog (WDO ignored); high enables watchdog with CWD-selected timing |
| CWD | Watchdog timing selection | Configures timeout mode: unconnected → factory 1600 ms; 10 kΩ to VDD → factory 200 ms; capacitor to GND → user-programmable |
| WDI | Watchdog input | Falling-edge-triggered; must be pulsed before tWD expiry to prevent WDO assertion; driven to VDD/GND only when watchdog disabled |
| WDO | Watchdog output | Open-drain fault indicator; asserts low for tRST duration only when RESET is high - enables diagnostic logging without full system reset |
| RESET | System reset output | Open-drain primary reset signal; asserted low when VDD < VITN or MR low; deasserts after tRST once VDD > VITN + VHYST |
Key Features
| Feature | Design Value |
|---|---|
| 0.8% VITN accuracy over –40°C to +125°C | Guarantees reset assertion before 5.0 V rail drops below 4.76 V, meeting ASIL-B functional safety timing margins |
| Dual independent outputs (RESET + WDO) | Enables layered fault response: WDO triggers firmware debug logging while RESET performs hard reset only on critical failures |
| Factory-programmed watchdog with 15% timing accuracy | Eliminates external timing components and calibration, reducing BOM count and qualification effort for automotive production |
| Wettable flank VSON-8 package | Supports automated AOI for solder joint integrity verification - critical for zero-defect automotive manufacturing standards |
| Functional Safety-Capable documentation | Provides FIT rate data, failure mode analysis, and diagnostic coverage metrics needed for ISO 26262 ASIL-B system integration |
Applications
| ADAS Domain Controller | Automotive Front Camera |
|---|---|
|
Use Scenario: Monitors 5.0 V power rail supplying vision processor and image sensor in centralized ADAS compute unit. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor - asserts RESET on rail collapse and WDO on firmware hang detected via WDI strobe. Use Value: Prevents silent corruption by ensuring processor reset within 200 ms of undervoltage, while WDO enables root-cause analysis without disrupting camera streaming. |
Use Scenario: Supervises 5.0 V DC/DC converter output powering CMOS image sensor and ISP in front-facing driver assistance camera. IC Role / Device Role / Timing Role: Precision undervoltage detector with hysteresis - triggers RESET before sensor supply violates 4.75 V min spec, avoiding frame corruption. Use Value: 0.5% hysteresis eliminates chatter during engine cranking transients; 0.8% VITN accuracy ensures compliance with ISO 16750-2 pulse 4b test limits. |
| Surround View System ECU | Vehicle Occupant Detection Sensor |
|
Use Scenario: Manages power sequencing and fault detection across four camera inputs and stitching SoC in 360° surround view module. IC Role / Device Role / Timing Role: Centralized supervisory node - uses MR input for coordinated multi-camera reset and WDO for individual subsystem hang isolation. Use Value: Dual open-drain outputs allow shared pull-up networks across multiple cameras; VSON-8 footprint minimizes board area in space-constrained junction box mounting. |
Use Scenario: Supervises 3.3 V rail powering capacitive occupancy sensing MCU and analog front-end in seat-mounted airbag control module. IC Role / Device Role / Timing Role: High-reliability reset generator - leverages AEC-Q100 Grade 1 qualification and ±4 kV HBM ESD rating for harsh in-cabin environment. Use Value: 10 µA supply current extends battery backup runtime during ignition-off monitoring; wettable flanks ensure IPC-A-610 Class 3 solder joint reliability. |
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 |
|---|---|---|---|
| TPS3851G50SQDRBRQ1 | Same VSON-8 package and 4.8 V VITN, but G-grade (–40°C to +125°C) lacks AEC-Q100 qualification documentation | Not approved for automotive safety-critical systems requiring ASIL-B evidence packages | Select only for non-safety automotive infotainment or industrial applications where functional safety certification is not required |
| MAX6373KA29+T | Fixed 2.93 V threshold, no programmable watchdog, 1.5% VITN accuracy, SO-8 package | Lacks dual-output architecture and automotive temperature range; suitable only for non-automotive 3.3 V systems | Use only for cost-sensitive industrial designs where watchdog independence and 0.8% accuracy are not required |
Compared with TPS3851H50SQDRBRQ1, the G50 variant omits AEC-Q100 documentation support needed for ISO 26262 projects, while MAX6373 offers lower accuracy and no WDO diagnostic capability - making TPS3851H50SQDRBRQ1 the sole option meeting ASIL-B-compliant ADAS power supervision requirements.
Availability
TPS3851H50SQDRBRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive front cameras, surround view ECUs, vehicle occupant detection sensors, and automotive DC/DC converters requiring stable component supply across automotive production lifecycles.
Supply support for TPS3851H50SQDRBRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade IC design and functional safety certification.
The TPS3851-Q1 product line delivers AEC-Q100 qualified voltage supervisors with integrated watchdog timers specifically engineered for ASIL-B automotive safety systems including ADAS, body electronics, and powertrain control modules.
FAQ
What is the exact undervoltage threshold voltage for TPS3851H50SQDRBRQ1?
The TPS3851H50SQDRBRQ1 has a nominal undervoltage threshold (VITN) of 4.8 V with ±0.8% accuracy over –40°C to +125°C. This variant is part of the H50 family, explicitly configured for 5.0 V rail monitoring. The 0.5% hysteresis ensures clean transition behavior during supply ramp-up and transient recovery.
How does the watchdog timeout get configured on TPS3851H50SQDRBRQ1?
The TPS3851H50SQDRBRQ1 supports three watchdog timeout modes: (1) unconnected CWD pin enables factory-programmed 1600 ms standard timing; (2) 10 kΩ pullup to VDD selects 200 ms extended timing; (3) capacitor from CWD to GND allows user-defined timing (0.704 ms to 77.45 s). SET1 must be high for any watchdog operation.
Is TPS3851H50SQDRBRQ1 qualified for automotive safety applications?
Yes, TPS3851H50SQDRBRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), HBM ±4 kV/CDM ±1 kV ESD rated, and designated Functional Safety-Capable with supporting documentation for ISO 26262 ASIL-B system integration - including FIT rate, FMEDA, and diagnostic coverage reports.
What package type and dimensions does TPS3851H50SQDRBRQ1 use?
TPS3851H50SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON package (DRB suffix) with exposed thermal pad connected to GND. It features wettable flanks for automated optical inspection - a requirement for IPC-A-610 Class 3 automotive assembly standards.
Can TPS3851H50SQDRBRQ1 monitor multiple voltage rails simultaneously?
No, TPS3851H50SQDRBRQ1 monitors only the VDD supply rail. It does not support multi-rail supervision. For systems requiring monitoring of 1.8 V, 2.5 V, or 3.3 V rails, separate devices such as TPS3851G18SQDRBRQ1 or TPS3851G33SQDRBRQ1 must be used - each optimized for its specific threshold voltage.
TPS3851H50SQDRBRQ1 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
- Supplier Device Package:
- 8-SON (3x3)
TPS3851H50SQDRBRQ1 FAQ
1.How can I place an order for TPS3851H50SQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851H50SQDRBRQ1 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 TPS3851H50SQDRBRQ1 reliable?
The price and inventory of TPS3851H50SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851H50SQDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3851H50SQDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851H50SQDRBRQ1 transactions.
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4.How is shipping managed for TPS3851H50SQDRBRQ1?
TPS3851H50SQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3851H50SQDRBRQ1 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 TPS3851H50SQDRBRQ1?
For technical support, including TPS3851H50SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851H50SQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851H50SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851H50SQDRBRQ1 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 TPS3851H50SQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851H50SQDRBRQ1?
All TPS3851H50SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851H50SQDRBRQ1, 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 TPS3851H50SQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851H50SQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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