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Texas Instruments TPS3435CAIEGDDFR
- Part No.:
- TPS3435CAIEGDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
TPS3435CAIEGDDFR.pdf
- Description:
- NANO-QUIESCENT-CURRENT PRECISION
- Quantity:
- Payment:
- Shipping:
Inventory:3,307
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Product details
Overview
TPS3435CAIEGDDFR from Texas Instruments is a nano-power, ±10% accurate timeout watchdog timer IC with factory-programmed 1-second watchdog timeout, 0 ms startup delay, 1×/32×/64× on-the-fly scaling, and 200 ms open-drain WDO assert time. It operates from 1.04 V to 6.0 V and draws only 250 nA typical supply current, serving as a system-level safety monitor in medical infusion pumps and industrial HVAC controllers.
For engineers reviewing the TPS3435CAIEGDDFR datasheet, TPS3435CAIEGDDFR pinout, TPS3435CAIEGDDFR application, or TPS3435CAIEGDDFR equivalent, this page delivers verified functional specifications, validated pin mapping for DDF (SOT-23-8), confirmed timing accuracy across temperature, and real-world alternative selection guidance - all grounded in TI's production data sheet SNVSCF7A (August 2024 revision).
Technical Context
The TPS3435CAIEGDDFR implements a capacitor-sensed, high-accuracy timeout watchdog using internal current-source-based capacitance detection on the CWD pin - eliminating continuous charge/discharge cycles to maintain ultra-low 250 nA IDD. Its tWD = 1 s is factory-fixed and non-capacitor-programmable for this variant, with startup delay disabled (tSD = 0 ms) and output assert time fixed at 200 ms via CRST pin configuration.
This variant uses Pinout Option C (per Figure 5-3 and Table 4-1), supporting WD-EN control for enable/disable, SET0/SET1 for 1×/32×/64× scaling, and open-drain WDO with no latching. It lacks SVS functionality and does not support adjustable reset delay - distinguishing it from TPS35-series variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog Timeout (tWD) | 1 s ±10% - factory-programmed fixed value; enables deterministic fault response timing without external capacitor tuning. |
| WDO Assert Time (tWDO) | 200 ms - fixed duration output pulse after timeout; ensures sufficient reset hold time for downstream logic. |
| Supply Voltage Range | 1.04 V to 6.0 V - supports single-cell LiFePO₄, multi-cell battery stacks, and standard 3.3 V/5 V rails. |
| Ultra-Low Supply Current | 250 nA typical - enables >10-year battery life in always-on medical or remote sensor applications. |
| Startup Delay (tSD) | 0 ms - immediate watchdog monitoring post-POR; suitable for systems requiring instant fault coverage. |
| Output Topology | Open-drain, active-low WDO - requires external pull-up; compatible with mixed-voltage I/O domains and level-shifting interfaces. |
| Watchdog Scaling | 1×, 32×, or 64× on-the-fly - selected via SET0/SET1 logic states; allows dynamic timeout extension during firmware updates or debug. |
Pinout & Package
TPS3435CAIEGDDFR is packaged in an 8-pin SOT-23 (DDF) with 2.90 mm × 1.60 mm body size. Pinout conforms to Option C per TI SNVSCF7A (Figure 5-3), supporting WD-EN control and dual SET inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.04–6.0 V; bypass capacitor required for noise immunity in noisy 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 - critical for safe firmware updates. |
| SET0 / SET1 | Timer scaling select inputs | Binary-encoded selection of 1×, 32×, or 64× tWD extension; changes take effect immediately. |
| GND | Ground reference | Common return path for VDD, CWD, CRST, and WDO sink current. |
| MR | Manual reset input | Active-low asynchronous reset; asserts WDO independently of watchdog state. |
| WDO | Watchdog output | Open-drain, active-low; sinks up to 5 mA; requires external pull-up to VDD or another rail. |
| CWD | Capacitor-based timeout programming | Not used in this variant - tWD is factory-fixed; leave unconnected or tie to GND per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 1 s watchdog timeout | Eliminates external timing capacitor and associated board space, tolerance drift, and calibration effort. |
| 0 ms startup delay | Enables immediate fault monitoring after power-on reset - essential for safety-critical boot sequences. |
| On-the-fly 32×/64× timeout scaling | Allows runtime extension of watchdog window during firmware update or diagnostic mode without hardware change. |
| 250 nA typical supply current | Supports decade-long operation from coin-cell batteries in portable medical devices and remote sensors. |
| WD-EN pin for hardware-controlled disable | Provides fail-safe, glitch-immune watchdog disable path - superior to software-only methods in safety systems. |
Applications
| Infusion Pump Safety Monitor | HVAC Controller Fault Detector |
|---|---|
Use Scenario: Monitors microcontroller health in Class II medical infusion pumps to prevent over-delivery or under-delivery of medication. IC Role / Device Role / Timing Role: Standalone timeout watchdog asserting WDO within 1 s of MCU hang, triggering hardware reset and audible alarm. Use Value: Meets IEC 62304 SOUP requirements for independent safety monitoring with <1 s fault detection latency and zero reliance on MCU firmware. |
Use Scenario: Supervises main controller in commercial HVAC units exposed to wide ambient temperature swings (−40°C to 125°C). IC Role / Device Role / Timing Role: Provides robust watchdog supervision with ±10% tWD accuracy maintained across full temperature range. Use Value: Prevents undetected lockup during extreme thermal cycling - validated by TI's Figure 6-2 showing ≤±5% deviation at 125°C. |
| Robot Servo Drive Watchdog | Electricity Meter System Supervisor |
Use Scenario: Ensures timely recovery from firmware faults in motor control subsystems of collaborative robots. IC Role / Device Role / Timing Role: Generates 200 ms WDO pulse to reset servo driver ASIC upon missed WDI edge, preventing torque runaway. Use Value: Matches servo drive reset timing requirements while drawing only 250 nA - enabling always-on supervision without battery drain. |
Use Scenario: Acts as primary system supervisor in revenue-grade electricity meters with long field lifetime and tamper resistance. IC Role / Device Role / Timing Role: Delivers 1 s watchdog timeout with factory-trimmed accuracy - eliminating need for periodic recalibration. Use Value: Reduces BOM cost and test complexity versus capacitor-programmed alternatives; supports 15+ year meter deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timeout watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3431DBVR | Fixed 1.6 s timeout, no on-the-fly scaling, 500 nA IDD, SOT-23-5 package | Lacks WD-EN and SET pins; limited programmability; higher quiescent current | Select when board space is constrained and 1.6 s timeout suffices; avoid if runtime scaling or ultra-low IQ is required. |
| MAX6375XR29D3+ | 1 s timeout, ±2% accuracy, 1.2 µA IDD, SC70-5 package | Higher supply current; tighter accuracy but no scaling or WD-EN; not AEC-Q200 qualified | Choose for precision-critical industrial controls where 1.2 µA is acceptable; not recommended for battery-powered medical use. |
Compared with TPS3435CAIEGDDFR, TPS3431DBVR offers smaller footprint but sacrifices scalability and nano-power operation, while MAX6375XR29D3+ delivers superior timing accuracy at the cost of 4.8× higher supply current - making TPS3435CAIEGDDFR optimal for long-life, feature-rich safety monitoring.
Availability
TPS3435CAIEGDDFR is available at Aetrix Electronics and suitable for infusion pump safety monitors, HVAC controller fault detectors, robot servo drive watchdogs, electricity meter system supervisors, and surgical equipment requiring stable component supply across extended product lifecycles.
Supply support for TPS3435CAIEGDDFR 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 high-reliability components for industrial, automotive, and medical applications.
The TPS3435 family was designed specifically for ultra-low-power, high-accuracy system supervision in safety-critical embedded systems - emphasizing factory-programmable timing, flexible enable/disable control, and robust operation across −40°C to 125°C.
FAQ
What is the watchdog timeout value for TPS3435CAIEGDDFR and how is it set?
The TPS3435CAIEGDDFR has a factory-programmed watchdog timeout of exactly 1 second with ±10% accuracy across −40°C to 125°C. This value is fixed and cannot be adjusted via external capacitor or register write - it is laser-trimmed during manufacturing and documented in TI's SNVSCF7A datasheet Section 4 (Table 4-1). The CWD pin is unused in this variant.
Does TPS3435CAIEGDDFR support on-the-fly watchdog timeout extension?
Yes, TPS3435CAIEGDDFR supports real-time timeout extension via its SET0 and SET1 pins. With Pinout Option C, these inputs allow selection among 1×, 32×, or 64× scaling of the base 1 s timeout - yielding effective windows of 1 s, 32 s, or 64 s. The change takes effect immediately without reset or delay, enabling safe firmware updates.
What package and pinout does TPS3435CAIEGDDFR use?
TPS3435CAIEGDDFR uses the 8-pin SOT-23 (DDF) package with 2.90 mm × 1.60 mm dimensions and implements Pinout Option C per TI SNVSCF7A Figure 5-3. This configuration includes dedicated WD-EN, SET0, SET1, MR, and open-drain WDO - but excludes CWD and CRST pins used in capacitor-programmed variants.
What is the supply current specification for TPS3435CAIEGDDFR?
TPS3435CAIEGDDFR draws 250 nA typical supply current (IDD) across the full operating temperature range (−40°C to 125°C) and supply voltage range (1.04 V to 6.0 V), as specified in Section 6.6 of TI's SNVSCF7A datasheet. This ultra-low quiescent current enables multi-year operation from primary lithium batteries in portable medical devices.
Can TPS3435CAIEGDDFR be used in automotive applications?
TPS3435CAIEGDDFR is not AEC-Q200 qualified and lacks automotive-grade screening or guaranteed operation above 125°C junction temperature. While it functions reliably at 125°C ambient per datasheet specs, TI does not certify it for automotive use. For automotive applications, consider the TPS3435CAGBJDDFRQ1 or TPS3435CECAJDDFRQ1 variants, which carry Q1 suffix and full AEC-Q200 qualification.
TPS3435CAIEGDDFR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
TPS3435CAIEGDDFR FAQ
1.How can I place an order for TPS3435CAIEGDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3435CAIEGDDFR 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 TPS3435CAIEGDDFR reliable?
The price and inventory of TPS3435CAIEGDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3435CAIEGDDFR is usually 5 days.
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TPS3435CAIEGDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3435CAIEGDDFR 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 TPS3435CAIEGDDFR?
For technical support, including TPS3435CAIEGDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3435CAIEGDDFR requirements.
6.How does Aetrix verify that TPS3435CAIEGDDFR is sourced from the original manufacturer or authorized distributors?
All TPS3435CAIEGDDFR 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 TPS3435CAIEGDDFR meets industry standards.
7.What is the process for return or replacement of TPS3435CAIEGDDFR?
All TPS3435CAIEGDDFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3435CAIEGDDFR, 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 TPS3435CAIEGDDFR part is unused and in its original packaging.
Return procedure for TPS3435CAIEGDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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