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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments TPS3851G25SQDRBRQ1

Name: TPS3851G25SQDRBRQ1
Brand: Texas Instruments
SKU: TPS3851G25SQDRBRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3851G25SQDRBRQ1

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: 8-VDFN Exposed Pad

Datasheet:: TPS3851G25SQDRBRQ1.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SON

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Product details

Overview

TPS3851G25SQDRBRQ1 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 reliable power-on reset and fault detection in ADAS domain controllers and front camera ECUs.

For engineers reviewing the TPS3851G25SQDRBRQ1 datasheet, TPS3851G25SQDRBRQ1 pinout, TPS3851G25SQDRBRQ1 application, or TPS3851G25SQDRBRQ1 equivalent, this device delivers precision undervoltage monitoring for 2.5 V rails, factory-programmed watchdog timing, manual reset input, and watchdog disable capability - critical for functional safety-compliant automotive microcontroller supervision.

Technical Context

The TPS3851G25SQDRBRQ1 implements a precision bandgap-based comparator for undervoltage detection on VDD with 0.5% hysteresis and 0.8% threshold accuracy across temperature. Its internal state machine evaluates CWD pin configuration at power-up to select between capacitor-programmable or factory-set watchdog timeouts.

It features dual independent open-drain outputs: RESET asserts when VDD falls below 2.5 V ± 0.8%, with 200 ms delay (15% tolerance); WDO asserts only when RESET is deasserted and watchdog timeout occurs - enabling fault isolation without full system reset.

Key Specifications

Parameter	Value and Actual Design Meaning
V_ITN Threshold	2.5 V nominal, ±0.8% accuracy over –40°C to +125°C - ensures reliable reset before microcontroller brownout on 2.5 V supply rails
Reset Timeout (t_RST)	200 ms typical, ±15% tolerance - provides stable, predictable reset hold time for SoC initialization
Supply Current (I_DD)	10 µA typical at 25°C - enables low-power always-on supervision in battery-backed automotive modules
Hysteresis (V_HYST)	0.5% of V_ITN - prevents chatter during slow-rising/falling VDD transitions in noisy vehicle electrical systems
Watchdog Timeout (t_WD)	1600 ms typical (factory-set, SET1 = 1, CWD unconnected) - supports robust firmware health checking in ADAS processors
Input Voltage Range	1.6 V to 6.5 V - accommodates wide-input DC/DC converters powering 2.5 V logic rails
ESD Rating	HBM ±4 kV, CDM ±1 kV - meets AEC-Q100 stress requirements for under-hood and cabin electronics

Pinout & Package

TPS3851G25SQDRBRQ1 is housed in a wettable-flank 3.00 mm × 3.00 mm, 8-pin VSON (DRB) package, optimized for automated optical inspection (AOI) and thermal performance via exposed thermal pad connected to GND.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply input	Monitored 2.5 V rail input; requires 0.1 µF bypass capacitor for noise immunity
GND	Ground reference	Common return path; thermal pad must be soldered to large-area ground plane
MR	Manual reset input	Active-low input with internal 620 nA pullup; initiates reset independent of VDD level
RESET	Open-drain reset output	Asserts low when VDD < 2.5 V ± 0.8%; held low for 200 ms after recovery - drives microcontroller /RST
SET1	Watchdog enable/disable control	Grounding disables watchdog; eliminates false timeouts during firmware development or boot sequences
WDI	Watchdog input	Falling-edge-triggered; must be pulsed before t_WD(min) to prevent WDO assertion - connects to MCU GPIO
WDO	Open-drain watchdog output	Asserts low only when RESET is high and watchdog expires - enables fault logging without system reset
CWD	Watchdog timing selection	Unconnected or pulled to VDD via 10 kΩ selects factory 1600 ms timeout; capacitor to GND enables user programming

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient operation - suitable for engine bay and ADAS ECU deployment
Functional Safety-Capable documentation	Includes FIT rate, failure mode analysis, and diagnostic coverage data - accelerates ISO 26262 ASIL-B system certification
Precision 2.5 V undervoltage monitoring	0.8% threshold accuracy with 0.5% hysteresis - eliminates need for external trimming in tight-tolerance 2.5 V domains
Dual independent open-drain outputs	Separate RESET and WDO pins - allows independent handling of power-fail vs. software-fault conditions
Configurable watchdog disable	SET1 pin disables watchdog without affecting RESET functionality - simplifies debug and bootloader integration
Wettable-flank VSON package	3 mm × 3 mm DRB footprint with solderable side walls - enables 100% AOI verification for automotive production traceability

Applications

ADAS Domain Controller	Automotive Front Camera
Use Scenario: Supervises 2.5 V core supply and monitors firmware health in centralized ADAS processing units running real-time perception stacks. IC Role / Device Role / Timing Role: Primary voltage supervisor and watchdog co-processor - provides POR, brownout reset, and independent fault signaling via WDO. Use Value: Prevents silent corruption by asserting RESET on 2.5 V rail collapse and isolating software hangs via WDO without disrupting sensor fusion timing.	Use Scenario: Ensures reliable boot and runtime supervision of image signal processor (ISP) and MIPI interface in forward-facing camera modules. IC Role / Device Role / Timing Role: Dual-role supervisor - RESET guarantees clean SoC initialization; WDO validates ISP firmware execution cycles. Use Value: Enables fail-safe camera restart on power transients while preserving frame sync integrity through decoupled WDO signaling.
Surround View System ECU	Vehicle Occupant Detection Sensor
Use Scenario: Monitors 2.5 V auxiliary rail powering multi-camera stitching logic and CAN FD communication interfaces. IC Role / Device Role / Timing Role: System-level power integrity guardian - detects undervoltage on distributed 2.5 V supplies and flags watchdog timeouts per subsystem. Use Value: Maintains deterministic reset behavior across four-camera inputs and avoids false CAN bus off states caused by partial logic collapse.	Use Scenario: Supervises 2.5 V supply to capacitive sensing ASIC and low-power MCU in seat occupancy detection modules. IC Role / Device Role / Timing Role: Always-on supervisor with ultra-low 10 µA IDD - performs periodic watchdog checks during sleep modes. Use Value: Guarantees occupant detection reliability over 15-year vehicle lifetime by eliminating undervoltage-induced false negatives.

ADAS Domain Controller

Automotive Front Camera

Use Scenario: Supervises 2.5 V core supply and monitors firmware health in centralized ADAS processing units running real-time perception stacks.

IC Role / Device Role / Timing Role: Primary voltage supervisor and watchdog co-processor - provides POR, brownout reset, and independent fault signaling via WDO.

Use Value: Prevents silent corruption by asserting RESET on 2.5 V rail collapse and isolating software hangs via WDO without disrupting sensor fusion timing.

Use Scenario: Ensures reliable boot and runtime supervision of image signal processor (ISP) and MIPI interface in forward-facing camera modules.

IC Role / Device Role / Timing Role: Dual-role supervisor - RESET guarantees clean SoC initialization; WDO validates ISP firmware execution cycles.

Use Value: Enables fail-safe camera restart on power transients while preserving frame sync integrity through decoupled WDO signaling.

Surround View System ECU

Vehicle Occupant Detection Sensor

Use Scenario: Monitors 2.5 V auxiliary rail powering multi-camera stitching logic and CAN FD communication interfaces.

IC Role / Device Role / Timing Role: System-level power integrity guardian - detects undervoltage on distributed 2.5 V supplies and flags watchdog timeouts per subsystem.

Use Value: Maintains deterministic reset behavior across four-camera inputs and avoids false CAN bus off states caused by partial logic collapse.

Use Scenario: Supervises 2.5 V supply to capacitive sensing ASIC and low-power MCU in seat occupancy detection modules.

IC Role / Device Role / Timing Role: Always-on supervisor with ultra-low 10 µA IDD - performs periodic watchdog checks during sleep modes.

Use Value: Guarantees occupant detection reliability over 15-year vehicle lifetime by eliminating undervoltage-induced false negatives.

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
TPS3851G18SQDRBRQ1	Fixed 1.8 V undervoltage threshold; identical watchdog, timing, and package	Designed for 1.8 V I/O rails - not interchangeable on 2.5 V systems without redesign	Select only if supervising 1.8 V supply; threshold mismatch causes premature or failed reset on 2.5 V rails
TPS3851G33SQDRBRQ1	Fixed 3.3 V undervoltage threshold; same accuracy, hysteresis, and functional safety support	Targeted at 3.3 V microcontroller domains - incompatible with 2.5 V rail monitoring	Use for 3.3 V applications only; substituting into 2.5 V design results in no reset assertion until catastrophic collapse

Compared with TPS3851G18SQDRBRQ1 and TPS3851G33SQDRBRQ1, the TPS3851G25SQDRBRQ1 provides exact 2.5 V threshold matching - eliminating margin loss and ensuring reset occurs precisely at the microcontroller's specified V_MIN, which is critical for ASIL-B compliant ADAS subsystems.

Availability

TPS3851G25SQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, front camera modules, and surround view ECUs requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for TPS3851G25SQDRBRQ1 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 ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

The TPS3851-Q1 product line delivers AEC-Q100 qualified supervisors with integrated watchdogs for functional safety-critical automotive applications - designed specifically for ADAS, body electronics, and powertrain control units demanding precision, reliability, and safety documentation.

FAQ

What is the exact undervoltage threshold voltage of the TPS3851G25SQDRBRQ1?

The TPS3851G25SQDRBRQ1 has a nominal undervoltage threshold (V_ITN) of 2.5 V, with guaranteed accuracy of ±0.8% over –40°C to +125°C ambient temperature. This means the actual trip point falls within 2.48 V to 2.52 V across its full operating range, making it suitable for precise supervision of 2.5 V microcontroller supply rails.

Does the TPS3851G25SQDRBRQ1 support both reset and watchdog functions simultaneously?

Yes, the TPS3851G25SQDRBRQ1 supports concurrent reset and watchdog operation: RESET asserts on VDD undervoltage, while WDO independently signals watchdog timeout - but only when RESET is deasserted (high). This dual-output architecture enables fault isolation, allowing system firmware to distinguish between power faults and software hangs.

How is the watchdog timeout configured on the TPS3851G25SQDRBRQ1?

The TPS3851G25SQDRBRQ1 watchdog timeout is configured via the CWD and SET1 pins. With CWD unconnected and SET1 tied high, it defaults to 1600 ms (±15%). Pulling CWD to VDD via 10 kΩ selects 200 ms timeout. Connecting a capacitor from CWD to GND enables user-programmable timing using the internal 375 nA current source and V_CWD = 1.21 V threshold.

Is the TPS3851G25SQDRBRQ1 pin-compatible with other TPS3851-Q1 variants?

Yes, all TPS3851-Q1 family members, including TPS3851G25SQDRBRQ1, share identical 8-pin VSON (DRB) packaging, pinout, and electrical interface - differing only in factory-programmed undervoltage threshold (1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V). This enables drop-in replacement across voltage rails when board layout supports the target threshold.

What functional safety documentation is available for the TPS3851G25SQDRBRQ1?

Texas Instruments provides functional safety documentation for the TPS3851G25SQDRBRQ1 including FMEDA reports, FIT rate calculation (122 FIT), safety analysis summary, and diagnostic coverage metrics - all accessible via TI's functional safety portal. These materials support ISO 26262 ASIL-B system-level certification when integrated per TI's safety manual guidelines.

TPS3851G25SQDRBRQ1 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:: 2.5V

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, Wettable Flank

Supplier Device Package:: 8-VSON (3x3)

TPS3851G25SQDRBRQ1 FAQ

1.How can I place an order for TPS3851G25SQDRBRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3851G25SQDRBRQ1 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 TPS3851G25SQDRBRQ1 reliable?

The price and inventory of TPS3851G25SQDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3851G25SQDRBRQ1 is usually 5 days.

3.What payment methods are accepted for TPS3851G25SQDRBRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3851G25SQDRBRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS3851G25SQDRBRQ1?

TPS3851G25SQDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3851G25SQDRBRQ1 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 TPS3851G25SQDRBRQ1?

For technical support, including TPS3851G25SQDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3851G25SQDRBRQ1 requirements.

6.How does Aetrix verify that TPS3851G25SQDRBRQ1 is sourced from the original manufacturer or authorized distributors?

All TPS3851G25SQDRBRQ1 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 TPS3851G25SQDRBRQ1 meets industry standards.

7.What is the process for return or replacement of TPS3851G25SQDRBRQ1?

All TPS3851G25SQDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3851G25SQDRBRQ1, 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 TPS3851G25SQDRBRQ1 part is unused and in its original packaging.

Return procedure for TPS3851G25SQDRBRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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