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Texas Instruments TPS3851H30SQDRBRQ1
- Part No.:
- TPS3851H30SQDRBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS3851H30SQDRBRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
TPS3851H30SQDRBRQ1 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 monitoring and safe startup in ADAS domain controllers and front camera power rails.
For engineers reviewing the TPS3851H30SQDRBRQ1 datasheet, TPS3851H30SQDRBRQ1 pinout, TPS3851H30SQDRBRQ1 application, or TPS3851H30SQDRBRQ1 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 and BOM selection.
Technical Context
The TPS3851H30SQDRBRQ1 implements a precision bandgap reference and comparator architecture achieving ±0.8% VITN accuracy across –40°C to +125°C ambient, with 0.5% hysteresis to prevent chatter near threshold. Its dual-output supervision includes independent RESET (with 200 ms fixed delay) and WDO (asserted on watchdog timeout only when RESET is deasserted).
Watchdog timing is selectable via CWD pin configuration: unconnected or 10 kΩ pullup enables factory-programmed 1.6 s (standard) or 200 ms (extended) timeouts; capacitor connection enables user-adjustable timing. SET1 pin disables watchdog logic entirely, and MR supports manual reset initiation with internal 620 nA pullup.
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% (–40°C to +125°C) - ensures reliable reset assertion before microcontroller VDD minimum tolerance is violated. |
| tRST | 200 ms ±15% - fixed, high-precision reset timeout eliminates need for external RC timing components. |
| IDD | 10 µA typical - enables always-on supervision in low-power automotive modules without battery drain concerns. |
| Hysteresis | 0.5% - provides noise immunity in electrically noisy vehicle environments while maintaining tight voltage margin control. |
| Watchdog Timeout Options | Factory-programmed: 1.6 s (standard) or 200 ms (extended); user-programmable via CWD capacitor - supports both fast-fault detection and long-cycle system health checks. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C TA) - qualified for under-hood and ADAS ECU deployment with HBM ±4 kV / CDM ±1 kV ESD robustness. |
Pinout & Package
TPS3851H30SQDRBRQ1 uses 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 | Supply input | Monitored rail input; requires 0.1 µF bypass capacitor for noise rejection in automotive transients. |
| GND | Ground reference | Common return path for all internal circuitry and thermal pad connection point. |
| RESET | Open-drain reset output | Asserts low when VDD < VITN or MR is pulled low; remains low for tRST after recovery; requires external pullup (1–100 kΩ). |
| WDO | Open-drain watchdog output | Asserts low only when watchdog times out *and* RESET is high; goes high-Z when RESET is low - enables fault isolation without full system reset. |
| MR | Manual reset input | Active-low input with internal 620 nA pullup; initiates reset independently of VDD status; pulse width ≥1 µs required. |
| WDI | Watchdog input | Falling-edge-triggered; must be driven to VDD or GND at all times to avoid IDD increase; ignored when RESET is asserted. |
| CWD | Watchdog timeout select | Determines timing mode: unconnected/10 kΩ pullup → factory presets; capacitor to GND → user-adjustable (0.1–1000 nF). |
| SET1 | Watchdog enable/disable | Logic low disables watchdog entirely; WDI is ignored; WDO remains high-Z; dynamic switching supported with 150 µs setup time. |
Key Features
| Feature | Design Value |
|---|---|
| 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–5.0 V rails with 4% or 7% threshold options and 0.5% hysteresis - eliminates external resistor networks for rail-specific detection. |
| Dual independent outputs | Separate RESET and WDO pins allow differentiated fault response: full system reset vs. diagnostic flagging without interrupting operation. |
| Watchdog disable via SET1 | Enables safe development and debug mode without hardware modification - no risk of spurious resets during firmware bring-up. |
| VSON-8 wettable flanks | Facilitates AOI-compatible solder joint inspection in high-reliability automotive PCB assembly - critical for zero-defect manufacturing. |
Applications
| ADAS Domain Controller | Automotive Front Camera |
|---|---|
Use Scenario: Monitors 3.3 V and 5.0 V power rails supplying SoC, image signal processor, and MIPI interface in centralized ADAS compute units. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog co-processor - asserts RESET on rail collapse and WDO on software hang detection. Use Value: Prevents silent corruption in sensor fusion algorithms by triggering controlled reboot before memory or timing faults propagate. |
Use Scenario: Supervises 1.8 V image sensor core supply and 3.3 V ISP I/O rail in compact front-facing vision modules exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Precision undervoltage detector with 0.8% accuracy - guarantees reset occurs before sensor analog front-end fails. Use Value: Eliminates false frame drops or corrupted pixel streams caused by marginal rail voltage during cold cranking. |
| Surround View System ECU | Vehicle Occupant Detection Sensor |
Use Scenario: Ensures reliable boot sequencing and runtime supervision across four camera inputs, CAN FD gateway, and FPGA-based stitching logic. IC Role / Device Role / Timing Role: Dual-output supervisor - RESET coordinates global power-on reset; WDO monitors FPGA configuration state machine. Use Value: Enables deterministic recovery from partial FPGA configuration failures without requiring full ECU power cycle. |
Use Scenario: Monitors 2.5 V supply to capacitive sensing ASIC and 3.3 V MCU in seat-mounted occupant classification systems. IC Role / Device Role / Timing Role: High-accuracy voltage supervisor with 0.5% hysteresis - rejects transient noise from seat motor actuation. Use Value: Maintains uninterrupted airbag deployment readiness by preventing nuisance resets during vehicle vibration events. |
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 |
|---|---|---|---|
| TPS3851G33SQDRBRQ1 | Fixed 3.3 V undervoltage threshold (VITN = 3.3 V); same 0.8% accuracy, 200 ms tRST, and VSON-8 package. | Designed for dedicated 3.3 V rail monitoring; lacks multi-threshold flexibility of TPS3851H30SQDRBRQ1's 3.0 V option. | Select when system uses only 3.3 V supply and threshold customization is unnecessary - reduces qualification overhead. |
| MAX6373KA29+T | Fixed 2.93 V threshold, ±1.5% accuracy, no programmable watchdog; SOT23-6 package; 15 µA IDD. | Lacks independent WDO output and factory-programmed watchdog modes - limited to basic reset-only supervision. | Choose for cost-sensitive non-safety-critical modules where watchdog functionality is omitted and AEC-Q100 Grade 1 is not required. |
Compared with TPS3851H30SQDRBRQ1, the TPS3851G33SQDRBRQ1 offers identical timing and accuracy but fixed 3.3 V threshold, while MAX6373KA29+T sacrifices watchdog capability, precision, and automotive qualification for smaller footprint and lower unit cost.
Availability
TPS3851H30SQDRBRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive front cameras, surround view ECUs, and vehicle occupant detection sensors requiring stable component supply with full automotive lifecycle support.
Supply support for TPS3851H30SQDRBRQ1 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 functional safety-capable, high-accuracy supervisors for automotive power-rail monitoring - designed specifically to meet ASIL-B requirements in ADAS, body electronics, and infotainment systems.
FAQ
What is the undervoltage threshold voltage for TPS3851H30SQDRBRQ1?
The TPS3851H30SQDRBRQ1 has a nominal undervoltage threshold (VITN) of 3.0 V, supporting precision monitoring of 3.0 V rails with ±0.8% accuracy over –40°C to +125°C. This value is factory-programmed and confirmed in TI's SBVS286B datasheet Section 5.5, where VITN is specified as 3.0 V with tolerance bounds derived from the 0.8% error band.
Does TPS3851H30SQDRBRQ1 support both standard and extended watchdog timing modes?
Yes, TPS3851H30SQDRBRQ1 supports both modes: standard timing (1.6 s typical watchdog timeout) and extended timing (200 ms typical), selected via CWD pin configuration. When CWD is unconnected or pulled up with 10 kΩ to VDD and SET1 = 1, the device uses factory-programmed values - explicitly documented in Table 7-1 of the datasheet for the H30 variant.
Can TPS3851H30SQDRBRQ1 be used without an external watchdog capacitor?
Yes, TPS3851H30SQDRBRQ1 operates without an external capacitor when CWD is left unconnected or pulled up to VDD via 10 kΩ - enabling factory-programmed watchdog timeouts. The device evaluates CWD state within 381 µs after VDD enters the valid range (VITN + VHYST), as defined in Section 5.6 and Figure 7-1 of the official datasheet.
What is the function of the SET1 pin on TPS3851H30SQDRBRQ1?
The SET1 pin on TPS3851H30SQDRBRQ1 controls watchdog enable/disable: grounding SET1 disables the watchdog timer entirely, causing WDI to be ignored and WDO to remain high-Z. This feature is validated in Section 6.3.4.4 and Table 6-1 of the datasheet, and supports safe development mode without hardware changes.
Is TPS3851H30SQDRBRQ1 qualified for automotive applications?
Yes, TPS3851H30SQDRBRQ1 is AEC-Q100 qualified Grade 1 (–40°C to +125°C ambient), with HBM ±4 kV and CDM ±1 kV ESD ratings. It also carries functional safety documentation for ISO 26262 system integration, as stated in Section 1 Features and Section 8 Device Support of the official TI datasheet SBVS286B.
TPS3851H30SQDRBRQ1 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)
TPS3851H30SQDRBRQ1 FAQ
1.How can I place an order for TPS3851H30SQDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3851H30SQDRBRQ1 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 TPS3851H30SQDRBRQ1 reliable?
The price and inventory of TPS3851H30SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851H30SQDRBRQ1 is usually 5 days.
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Once your TPS3851H30SQDRBRQ1 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 TPS3851H30SQDRBRQ1?
For technical support, including TPS3851H30SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851H30SQDRBRQ1 requirements.
6.How does Aetrix verify that TPS3851H30SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3851H30SQDRBRQ1 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 TPS3851H30SQDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3851H30SQDRBRQ1?
All TPS3851H30SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851H30SQDRBRQ1, 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 TPS3851H30SQDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS3851H30SQDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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