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Texas Instruments TPS3435CAKAGDDFRQ1
- Part No.:
- TPS3435CAKAGDDFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
TPS3435CAKAGDDFRQ1.pdf
- Description:
- AUTOMOTIVE NANO-QUIESCENT-CURRE
- Quantity:
- Payment:
- Shipping:
Inventory:3,049
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Product details
Overview
TPS3435CAKAGDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive watchdog timer IC with factory-programmed 1.6s watchdog timeout, ±10% accuracy, 200ms open-drain WDO assert time, 1.04V–6.0V supply range, and 250nA typical supply current. It serves as a precision system health monitor in safety-critical ECUs requiring ultra-low-power fault detection.
For engineers reviewing the TPS3435CAKAGDDFRQ1 datasheet, TPS3435CAKAGDDFRQ1 pinout, TPS3435CAKAGDDFRQ1 application, or TPS3435CAKAGDDFRQ1 equivalent, this page delivers verified timing accuracy, pin-confirmed SOT-23-8 configuration, automotive-grade reset behavior, and validated alternatives for BMS, camera ECU, and wireless charging systems.
Technical Context
The TPS3435CAKAGDDFRQ1 implements a capacitor-sensed, high-accuracy timeout watchdog using internal current-source-based capacitance measurement-eliminating continuous CWD charging/discharging to maintain sub-µA quiescent current. Its tWD = 1.6s is factory-fixed per orderable part number and does not require external capacitor programming.
It supports startup delay bypass (tSD = 0), on-the-fly timer scaling via SET[1:0] pins (1×/2×/4×), latched open-drain WDO output, MR-triggered reset assertion, and watchdog enable/disable via WD-EN pin-features enabled by Pinout Option C per TI's mechanical documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog Timeout (tWD) | 1.6 s ±10% - factory-programmed fixed value; no external capacitor required for this variant. |
| WDO Assert Time (tWDO) | 200 ms - fixed open-drain output pulse duration; ensures sufficient hold time for host processor recovery. |
| Supply Voltage Range | 1.04 V to 6.0 V - supports wide-input automotive power rails including post-regulated 1.8V/3.3V/5V domains. |
| Quiescent Current (IDD) | 250 nA typical - enables always-on monitoring in battery-backed systems without measurable drain. |
| Ambient Temp Range | –40°C to +125°C - AEC-Q100 Grade 1 qualification confirmed; suitable for under-hood and ADAS ECU placement. |
| Output Topology | Open-drain, active-low WDO - requires external pull-up; compatible with mixed-voltage logic interfaces. |
| Startup Delay (tSD) | 0 ms - immediate watchdog monitoring after POR; no boot-time grace period applied. |
Pinout & Package
TPS3435CAKAGDDFRQ1 uses the DDF package: 8-pin SOT-23 with nominal body size 2.90 mm × 1.60 mm. This variant implements Pinout Option C per TI documentation, featuring dedicated WD-EN control and dual SET inputs for on-the-fly scaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.04–6.0 V; bypass capacitor recommended for noise immunity in automotive environments. |
| WDI | Watchdog input | Falling-edge-triggered; must be toggled before tWD expires to prevent WDO assertion. |
| WD-EN | Watchdog enable/disable control | Logic-high enables watchdog; logic-low disables monitoring-no reset required to re-enable. |
| SET0 / SET1 | Timer scaling select | Configures real-time tWD multiplication factor (1×, 2×, or 4×) without interrupting ongoing watchdog frame. |
| MR | Manual reset input | Active-low asynchronous reset; asserts WDO immediately regardless of watchdog state. |
| WDO | Watchdog output | Open-drain, active-low; sinks up to 5 mA; requires external pull-up to VDD or another rail. |
| GND | Ground reference | Single ground pin; layout best practice requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Latched WDO operation | WDO remains asserted until cleared by MR deassertion or power cycle-prevents transient recovery from masking faults. |
| On-the-fly timer scaling | SET[1:0] pins dynamically adjust tWD by 1×/2×/4× during runtime-enables adaptive timeout for sleep/wake transitions. |
| Ultra-low IQ architecture | 250 nA typical IDD achieved via single-cycle capacitance sensing-no continuous oscillator or RC discharge overhead. |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualified with ±2000 V HBM ESD rating-validated for 15-year field life in harsh vehicular environments. |
| MR-initiated fault capture | MR pin triggers immediate WDO assertion independent of WDI activity-supports hardware-level emergency shutdown signaling. |
Applications
| On-board Wireless Charger | Battery Management System (BMS) |
|---|---|
Use Scenario: Monitors MCU firmware integrity during high-voltage charging handshaking and thermal regulation loops. IC Role / Device Role / Timing Role: Precision watchdog timer asserting WDO if MCU hangs during ISO 15118 message exchange or cell balancing command execution. Use Value: Prevents uncontrolled charging states by triggering hard reset within 1.6s, meeting ASIL-B diagnostic coverage requirements. |
Use Scenario: Supervises safety microcontroller in traction battery pack during vehicle ignition, drive, and regenerative braking cycles. IC Role / Device Role / Timing Role: Independent timeout monitor verifying periodic communication with cell monitor ICs and isolation drivers. Use Value: Guarantees fail-safe shutdown within 1.6s of communication loss-critical for preventing thermal runaway escalation. |
| Front Camera ECU | Surround View System ECU |
Use Scenario: Ensures continuous operation of image signal processor (ISP) and MIPI interface during ADAS vision processing. IC Role / Device Role / Timing Role: Low-power watchdog detecting ISP lockup or DMA stall that would cause video stream freeze or corruption. Use Value: Enables automatic recovery before frame drop exceeds ISO 26262 Class C timing constraints (≤2s). |
Use Scenario: Validates real-time stitching engine and CAN FD gateway firmware across four camera inputs and display output. IC Role / Device Role / Timing Role: System-level health monitor confirming periodic watchdog refreshes from multi-core SoC subsystems. Use Value: Provides deterministic 1.6s fault response-meeting surround-view functional safety goals for driver assistance continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timeout watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3431QDBVRQ1 | Fixed 2.0s timeout, no SET pin scaling, same SOT-23-6 package but fewer I/Os | Lacks WD-EN and programmable tWDO; limited to basic watchdog use without adaptive timing | Select when only static timeout and minimal pin count are required-no runtime scaling or latched output needed. |
| MAX6373KA+T | ±2% initial accuracy, 1.6s fixed timeout, push-pull output, wider temp range (–40°C to +125°C) | Higher accuracy but lacks MR input and on-the-fly scaling; not AEC-Q100 qualified | Choose for non-automotive industrial systems needing tighter timing tolerance and simpler output drive. |
Compared with TPS3435CAKAGDDFRQ1, TPS3431QDBVRQ1 offers reduced feature set and smaller footprint but no runtime adaptability, while MAX6373KA+T provides superior accuracy and push-pull drive at the cost of automotive qualification and system-level control features.
Availability
TPS3435CAKAGDDFRQ1 is available at Aetrix Electronics and suitable for automotive battery management, ADAS camera modules, and wireless charging systems requiring stable component supply across extended production lifecycles.
Supply support for TPS3435CAKAGDDFRQ1 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 over 50 years of innovation in high-reliability power and signal-chain solutions.
The TPS3435-Q1 product line delivers ultra-low-power, AEC-Q100-qualified watchdog timers optimized for functional safety compliance in next-generation electric vehicle ECUs and ADAS domain controllers.
FAQ
What is the watchdog timeout value for TPS3435CAKAGDDFRQ1?
The TPS3435CAKAGDDFRQ1 has a factory-programmed watchdog timeout (tWD) of 1.6 seconds with ±10% accuracy across –40°C to +125°C. This value is fixed per orderable part number and does not require external capacitor programming-unlike adjustable variants in the same family.
Does TPS3435CAKAGDDFRQ1 support latched output behavior?
Yes, TPS3435CAKAGDDFRQ1 supports latched WDO operation. Once asserted due to watchdog timeout or MR activation, the open-drain WDO output remains low until manually cleared by releasing the MR pin or performing a power cycle-ensuring fault persistence for downstream diagnostics.
What package and pinout does TPS3435CAKAGDDFRQ1 use?
TPS3435CAKAGDDFRQ1 uses the DDF package: an 8-pin SOT-23 with 2.90 mm × 1.60 mm body. It implements Pinout Option C, featuring dedicated WD-EN, SET0, SET1, MR, WDI, WDO, VDD, and GND terminals-confirmed in TI's official pin configuration diagrams.
Can the watchdog timeout be adjusted on-the-fly for TPS3435CAKAGDDFRQ1?
Yes, TPS3435CAKAGDDFRQ1 supports real-time tWD scaling via SET0 and SET1 pins. With Pinout Option C, these inputs configure multiplier factors of 1×, 2×, or 4×-allowing dynamic extension to 3.2s or 6.4s without resetting the watchdog frame or disrupting system operation.
Is TPS3435CAKAGDDFRQ1 qualified for automotive applications?
Yes, TPS3435CAKAGDDFRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with documented HBM ESD rating of ±2000 V and full production data validation. It meets functional safety requirements for ASIL-B–capable systems in battery management, camera, and charging ECUs.
TPS3435CAKAGDDFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- -
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
TPS3435CAKAGDDFRQ1 FAQ
1.How can I place an order for TPS3435CAKAGDDFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3435CAKAGDDFRQ1 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 TPS3435CAKAGDDFRQ1 reliable?
The price and inventory of TPS3435CAKAGDDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3435CAKAGDDFRQ1 is usually 5 days.
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Once your TPS3435CAKAGDDFRQ1 order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for TPS3435CAKAGDDFRQ1?
For technical support, including TPS3435CAKAGDDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3435CAKAGDDFRQ1 requirements.
6.How does Aetrix verify that TPS3435CAKAGDDFRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3435CAKAGDDFRQ1 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 TPS3435CAKAGDDFRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3435CAKAGDDFRQ1?
All TPS3435CAKAGDDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3435CAKAGDDFRQ1, 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 TPS3435CAKAGDDFRQ1 part is unused and in its original packaging.
Return procedure for TPS3435CAKAGDDFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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