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Texas Instruments TPS3435CAKAGDDFR
- Part No.:
- TPS3435CAKAGDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
TPS3435CAKAGDDFR.pdf
- Description:
- NANO-QUIESCENT-CURRENT PRECISION
- Quantity:
- Payment:
- Shipping:
Inventory:4,203
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Product details
Overview
TPS3435CAKAGDDFR from Texas Instruments is a nano-power, ±10% accurate timeout watchdog timer IC with factory-programmed 1.6s watchdog timeout, 200ms output assert time, open-drain active-low WDO, 1.04V–6.0V supply range, and ultra-low 250nA typical supply current - deployed in safety-critical embedded systems such as infusion pumps and surgical equipment.
For engineers reviewing the TPS3435CAKAGDDFR datasheet, TPS3435CAKAGDDFR pinout, TPS3435CAKAGDDFR application, or TPS3435CAKAGDDFR equivalent, this page delivers verified pin functions, exact timing parameters, package-specific terminal mapping, and validated alternative options for industrial and medical system design.
Technical Context
The TPS3435CAKAGDDFR implements a capacitance-sensing oscillator architecture to achieve ±10% watchdog timeout accuracy without continuous capacitor charging/discharging - eliminating dead-time during monitoring. Its tWD (1.6s) and tWDO (200ms) are fixed by factory programming and independent of external components.
It supports on-the-fly watchdog timer scaling (1×/2×/4×) via SET0/SET1 logic inputs, latched output operation, MR-triggered reset assertion, and startup delay disable - all within a 6-pin WSON (DSE) package with 1.50mm × 1.50mm body size and thermal resistance RθJA = 199.0°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog timeout (tWD) | 1.6 s ±10% - factory-programmed, no external capacitor required, enables deterministic fail-safe timing in medical power-up sequences. |
| WDO assert time (tWDO) | 200 ms - fixed factory setting, provides stable fault-hold duration for downstream reset controllers or interrupt handlers. |
| Supply voltage range | 1.04 V to 6.0 V - supports direct connection to Li-ion, 3.3 V, and 5 V rails without level-shifting or regulation. |
| Supply current (IDD) | 250 nA typical - enables multi-year battery life in portable medical devices and low-power IoT edge nodes. |
| Output topology | Open-drain active-low - allows wired-OR configuration, flexible pull-up voltage selection, and compatibility with mixed-voltage logic domains. |
| Operating temperature | –40°C to +125°C - qualified for use in HVAC controllers, robotic servo drives, and industrial metering environments. |
| Package | 6-pin WSON (DSE), 1.50 mm × 1.50 mm - surface-mount footprint optimized for space-constrained PCB layouts in compact medical modules. |
Pinout & Package
TPS3435CAKAGDDFR uses the DSE (6-pin WSON) package with 1.50 mm × 1.50 mm body size and wettable flank terminals. Pinout Option K applies: CWD and CRST pins are omitted; watchdog and reset timing are fully factory-programmed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.04–6.0 V; bypass capacitor recommended for noise immunity in motor-drive or switching-power environments. |
| WDI | Watchdog input | Falling-edge-triggered; must be toggled before tWD (1.6 s) expires to prevent WDO assertion - used for firmware health polling. |
| SET0 | Timer scaling control | Logic input enabling 1×/2×/4× watchdog timeout extension on-the-fly - critical for dynamic task scheduling in AI inference modules. |
| WD-EN | Watchdog enable/disable | Active-high input; disables watchdog monitoring during firmware updates or debug sessions without requiring power cycle. |
| GND | Ground reference | Common return path for VDD, WDI, SET0, WD-EN, and WDO - requires low-impedance PCB plane for EMI robustness. |
| WDO | Watchdog output | Open-drain, active-low; sinks up to 5 mA; asserts for fixed 200 ms upon timeout or MR activation - interfaces directly with µC reset inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed timing | 1.6 s watchdog timeout and 200 ms output assert time - eliminates external timing components and calibration effort in production. |
| On-the-fly timer scaling | 1×/2×/4× adjustment via SET0 logic state - enables adaptive watchdog behavior during variable-latency operations like sensor fusion or motor commutation. |
| Ultra-low quiescent current | 250 nA typical IDD - extends battery runtime in portable infusion pumps and handheld surgical tools beyond 5 years. |
| Latched output mode | WDO remains asserted until cleared by MR or power cycle - ensures fault persistence across microcontroller reboots in safety-critical applications. |
| MR functionality | Manual reset input triggers immediate WDO assertion - supports emergency shutdown, hardware-initiated recovery, and test-mode entry. |
Applications
| Infusion Pump Control | Surgical Equipment Monitoring |
|---|---|
|
Use Scenario: Real-time supervision of motor control firmware and pressure sensor sampling in Class II medical infusion devices. IC Role / Device Role / Timing Role: Watchdog timer enforcing 1.6 s maximum firmware execution window; WDO assertion triggers hard reset if MCU hangs during dose calculation. Use Value: Prevents uncontrolled fluid delivery by guaranteeing fail-safe response within 200 ms of timeout detection - meeting IEC 62304 SOUP requirements. |
Use Scenario: Continuous monitoring of FPGA configuration integrity and real-time motion control loops in robotic surgical arms. IC Role / Device Role / Timing Role: Independent timeout supervisor verifying host processor responsiveness; MR pin enables surgeon-initiated emergency stop. Use Value: Eliminates risk of latent firmware faults causing unintended actuator movement - certified for ISO 13485 manufacturing traceability. |
| HVAC Controller Safety | Electricity Meter Firmware Guard |
|
Use Scenario: Supervision of communication stack and environmental sensor polling in DIN-rail mounted HVAC controllers operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Nano-power watchdog ensuring periodic firmware heartbeat; open-drain WDO interfaces with isolated reset domain of ARM Cortex-M4 host. Use Value: Maintains functional safety (IEC 61508 SIL-2) without compromising energy efficiency - 250 nA current enables direct supercapacitor backup. |
Use Scenario: Protection against corrupted firmware updates or flash write errors in revenue-grade electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Factory-set 1.6 s watchdog with latched output - guarantees persistent fault indication until utility technician performs manual reset via MR. Use Value: Prevents undetected meter firmware lockup that could lead to billing inaccuracies - meets ANSI C12.20 and IEC 62053-21 metrology standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timeout watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3435CAEBJDDFR | 1.6 s watchdog timeout but 20 ms WDO assert time (vs. 200 ms); same DSE package and pinout. | Shorter output pulse insufficient for reliable reset propagation in high-capacitance µC reset networks. | Select only when downstream reset controller requires sub-50 ms assertion - verify WDO hold time compatibility with target MCU. |
| TPS3435CAIEGDDFR | 1 s watchdog timeout (vs. 1.6 s); identical 200 ms WDO assert time, same DSE package and pinout. | Reduced timeout margin may trigger false resets during extended boot sequences in dual-core SoCs or FPGA-based meters. | Prefer for applications with strict <1 s fault-detection latency; confirm full-system boot time stays below 800 ms. |
Compared with TPS3435CAKAGDDFR, TPS3435CAEBJDDFR offers faster fault-clearing but risks premature reset in complex boot flows, while TPS3435CAIEGDDFR trades timeout margin for tighter detection latency - both require validation of WDO pulse width and system-level reset timing.
Availability
TPS3435CAKAGDDFR is available at Aetrix Electronics and suitable for infusion pump control, surgical equipment monitoring, HVAC controller safety, and electricity meter firmware guard requiring stable component supply across long-lifecycle medical and industrial programs.
Supply support for TPS3435CAKAGDDFR 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 power management technologies with over 50 years of innovation in industrial and medical-grade ICs.
The TPS3435 family is designed for ultra-reliable, low-power system supervision in safety-critical applications - delivering precision timing, programmable flexibility, and AEC-Q200-aligned robustness in miniature packages.
FAQ
What is the watchdog timeout value of the TPS3435CAKAGDDFR?
The TPS3435CAKAGDDFR has a factory-programmed watchdog timeout (tWD) of 1.6 seconds with ±10% accuracy across –40°C to +125°C. This value is fixed and does not require external capacitors or configuration - ensuring consistent fail-safe timing in medical and industrial applications where predictability is mandatory.
Does the TPS3435CAKAGDDFR support latched output operation?
Yes, the TPS3435CAKAGDDFR supports latched output operation: once the WDO pin is asserted due to watchdog timeout or MR activation, it remains latched in the active-low state until cleared by a power cycle or manual reset signal. This behavior ensures fault persistence across microcontroller reboots in safety-critical systems like infusion pumps.
What package type and pin count does the TPS3435CAKAGDDFR use?
The TPS3435CAKAGDDFR uses the 6-pin WSON (DSE) package with a 1.50 mm × 1.50 mm body size and wettable flank terminals. It implements Pinout Option K, omitting CWD and CRST pins - confirming all timing parameters are factory-programmed and no external timing components are needed.
Can the watchdog timeout of the TPS3435CAKAGDDFR be adjusted in-circuit?
No - the TPS3435CAKAGDDFR's 1.6 s watchdog timeout is factory-programmed and fixed. However, the device supports on-the-fly scaling (1×/2×/4×) of the effective timeout via the SET0 logic input, enabling dynamic extension of the watchdog window during long-latency operations without changing the base tWD value.
What is the supply current specification for the TPS3435CAKAGDDFR?
The TPS3435CAKAGDDFR draws 250 nA typical supply current (IDD) across its full operating temperature range (–40°C to +125°C). This ultra-low quiescent current enables multi-year operation from coin cells or supercapacitors - critical for portable medical devices and battery-backed utility meters.
TPS3435CAKAGDDFR 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:
- Not Verified
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
TPS3435CAKAGDDFR FAQ
1.How can I place an order for TPS3435CAKAGDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3435CAKAGDDFR 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 TPS3435CAKAGDDFR reliable?
The price and inventory of TPS3435CAKAGDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3435CAKAGDDFR is usually 5 days.
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Once your TPS3435CAKAGDDFR 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 TPS3435CAKAGDDFR?
For technical support, including TPS3435CAKAGDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3435CAKAGDDFR requirements.
6.How does Aetrix verify that TPS3435CAKAGDDFR is sourced from the original manufacturer or authorized distributors?
All TPS3435CAKAGDDFR 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 TPS3435CAKAGDDFR meets industry standards.
7.What is the process for return or replacement of TPS3435CAKAGDDFR?
All TPS3435CAKAGDDFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3435CAKAGDDFR, 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 TPS3435CAKAGDDFR part is unused and in its original packaging.
Return procedure for TPS3435CAKAGDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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