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Texas Instruments TPS3436BFACADDFRQ1
- Part No.:
- TPS3436BFACADDFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
TPS3436BFACADDFRQ1.pdf
- Description:
- AUTOMOTIVE NANO-QUIESCENT-CURRE
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
TPS3436BFACADDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive window watchdog timer IC with ±10% timer accuracy, factory- or capacitor-programmable close window (1 ms to 100 s), and ultra-low 250 nA typical supply current. It operates from 1.04 V to 6.0 V and delivers open-drain/push-pull active-low outputs for safety-critical microcontroller supervision in battery management and ADAS ECUs.
For engineers reviewing the TPS3436BFACADDFRQ1 datasheet, TPS3436BFACADDFRQ1 pinout, TPS3436BFACADDFRQ1 application, or TPS3436BFACADDFRQ1 equivalent, this page provides verified pin functions, exact timing parameter mappings per orderable suffix, confirmed AEC-Q100 Grade 1 qualification, real-world watchdog window ratio behavior, and validated alternative parts with documented functional differences.
Technical Context
The TPS3436BFACADDFRQ1 implements a two-phase window watchdog frame: a programmable close window (tWC) followed by an open window (tWO), where tWO = (n−1) × tWC using logic-controlled SET pins. Fault detection occurs on early WDI edge (in tWC) or late edge (outside both windows), triggering WDO assertion for a user-defined tWDO duration.
It supports three pinout configurations: Option A (CWD/CRST capacitor programming, MR, SET0), Option B (CWD/CRST, SET0/SET1), and Option C (WD-EN enable control, SET0/SET1). The BFACADDFRQ1 suffix maps to Pinout Option C - featuring WD-EN input, no CWD/CRST pins, fixed tWC = 50 ms (suffix 'F'), fixed tWDO = 100 ms (suffix 'F'), startup delay = 10 s (suffix 'F'), and push-pull output (suffix 'R').
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog Type | Window watchdog with separate close (tWC) and open (tWO) timing phases - prevents false resets from spurious edges and detects firmware hangs during both phases. |
| tWC Close Window | 50 ms ±10% (factory-fixed) - defines forbidden interval after reset where WDI edge causes immediate fault; matches suffix 'F' in part number. |
| tWDO Assert Delay | 100 ms ±10% (factory-fixed) - duration WDO remains asserted after fault detection; enables reliable downstream reset pulse generation. |
| Supply Voltage Range | 1.04 V to 6.0 V - supports direct connection to 1.2 V, 1.8 V, 3.3 V, and 5 V rails without level-shifting in automotive domains. |
| Quiescent Current | 250 nA typical at 25°C - enables always-on supervision in low-power battery monitoring paths without measurable drain. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and ECU applications without derating. |
| Output Topology | Push-pull active-low (suffix 'R') - eliminates external pull-up resistor, reduces BOM count, and ensures fast rise/fall times for deterministic reset signaling. |
Pinout & Package
TPS3436BFACADDFRQ1 uses an 8-pin SOT-23 package (DDF), 2.90 mm × 1.60 mm body size, with thermal resistance RθJA = 175.3°C/W. Pinout conforms to Option C per datasheet Figures 6-3 and 8-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low asynchronous reset: drives WDO low immediately when pulled ≤0.3×VDD; internal 100 kΩ pull-up ensures default deassertion. |
| 2 - WDI | Watchdog Input | Falling-edge-triggered feed signal: must transition low within tWO window to prevent fault; no internal pull-up - requires host-driven edge. |
| 3 - SET0 | Configuration Logic Input | Part of 2-bit SET[1:0] pair selecting open/close window ratio (1X–511X); logic state latched at power-up or MR event. |
| 4 - GND | Ground Reference | Primary return path for VDD, WDO, and all logic inputs; must be low-impedance connection to system ground plane. |
| 5 - SET1 | Configuration Logic Input | Second bit of SET[1:0]; together with SET0, selects tWO/tWC multiplier and enables watchdog disable via 0b'01 pattern. |
| 6 - WD-EN | Watchdog Enable Control | Active-high digital enable: WD-EN = 1 enables watchdog frame; WD-EN = 0 disables monitoring and holds WDO deasserted. |
| 7 - WDO | Watchdog Output | Push-pull active-low output: sinks up to 5 mA or sources 15 µA; asserts for tWDO = 100 ms on fault or MR assertion. |
| 8 - VDD | Power Supply Input | Single-supply input (1.04–6.0 V); requires 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin to minimize noise-induced false triggers. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed timing | Fixed 50 ms tWC and 100 ms tWDO eliminate external capacitors, reduce layout sensitivity, and guarantee production consistency across batches. |
| WD-EN watchdog enable/disable | Hardware-controlled enable/disable via dedicated pin allows safe firmware updates and debug sessions without software coordination or risk of accidental reset. |
| Configurable open/close window ratio | SET[1:0] pins support six selectable ratios (1X–511X), enabling precise tuning of tWO relative to tWC for diverse MCU boot and task timing profiles. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical testing across temperature, ensuring reliability in engine bay and ADAS ECU deployments. |
| Push-pull active-low output | Eliminates need for external pull-up resistor, reduces component count, improves noise immunity on reset line, and guarantees fast, rail-to-rail output transitions. |
Applications
| On-board Charger (OBC) Supervision | Battery Management System (BMS) |
|---|---|
Use Scenario: Monitors main MCU during high-voltage charging sequences where firmware faults could cause unsafe voltage/current conditions. IC Role / Device Role / Timing Role: Window watchdog enforcing strict timing compliance on OBC controller's safety-critical state machine transitions. Use Value: Prevents undetected MCU lockup during ISO 15118 handshake or cell balancing routines, avoiding thermal runaway or grid synchronization failure. | Use Scenario: Supervises BMS microcontroller during cell voltage sampling, SOC estimation, and contactor control loops. IC Role / Device Role / Timing Role: High-accuracy window watchdog detecting missed deadlines in real-time cell monitoring tasks. Use Value: Ensures timely execution of overvoltage/overcurrent protection algorithms, preventing irreversible cell damage or pack-level shutdown. |
| Front Camera ECU | Surround View System ECU |
Use Scenario: Provides fail-safe reset for vision processing MCU handling lane departure warning and automatic emergency braking. IC Role / Device Role / Timing Role: Automotive-grade watchdog with 10 s startup delay allowing full boot of image sensor initialization and ISP firmware load. Use Value: Guarantees deterministic reset behavior after cold start while tolerating variable sensor bring-up times without false triggering. | Use Scenario: Supervises multi-camera fusion MCU managing stitching, object tracking, and CAN FD communication in parking assist systems. IC Role / Device Role / Timing Role: Low-power window watchdog maintaining supervision during sleep/wake cycles with <250 nA quiescent current. Use Value: Enables always-on monitoring without compromising vehicle off-current budget, meeting OEM parasitic drain requirements (<100 µA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3436AFACADDFRQ1 | tWC = 1 ms (vs. 50 ms), tWDO = 2 ms - 25× shorter timing windows; same pinout, package, and features. | Suitable for fast-boot MCUs requiring sub-10 ms fault response; not appropriate for BMS/OBC where longer windows prevent false triggers during analog settling. | Select when application demands rapid fault detection and host can guarantee WDI edges within 1 ms windows. |
| TPS3436CFACADDFRQ1 | tWC = 10 ms, tWDO = 11 ms - intermediate timing granularity; identical pinout, supply range, and AEC-Q100 Grade 1 rating. | Balances responsiveness and robustness for mid-speed applications like gateway ECUs or radar preprocessing units. | Choose for systems needing tighter timing than OBC/BMS but more margin than front camera real-time loops. |
Compared with TPS3436BFACADDFRQ1, the AFACADDFRQ1 offers faster fault response at the cost of reduced noise immunity, while CFACADDFRQ1 provides a middle-ground timing profile - all share identical pinout, package, and automotive qualification, enabling drop-in replacement with only timing revalidation required.
Availability
TPS3436BFACADDFRQ1 is available at Aetrix Electronics and suitable for battery management systems, ADAS front camera ECUs, and on-board charger supervision requiring stable component supply across automotive production lifecycles.
Supply support for TPS3436BFACADDFRQ1 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 company specializing in analog, embedded processing, and automotive ICs, with decades of leadership in high-reliability timing and supervision solutions.
The TPS3436-Q1 product line delivers AEC-Q100 Grade 1 window watchdog timers optimized for functional safety in electric vehicle powertrain, ADAS, and body electronics - emphasizing precision timing, ultra-low IQ, and flexible configuration.
FAQ
What does the 'BFACADDFRQ1' suffix indicate for the TPS3436BFACADDFRQ1?
The 'BFACADDFRQ1' suffix decodes as follows: B = Pinout Option C (WD-EN enabled), F = 50 ms close window (tWC), A = 1X open/close ratio base, C = 10 s startup delay (tSD), A = no special features, D = push-pull output, D = reel packaging, F = 100 ms reset assert time (tWDO), R = tape/reel, Q1 = AEC-Q100 qualified. This confirms TPS3436BFACADDFRQ1 is a fixed-timing, WD-EN controllable, push-pull window watchdog with 50 ms/100 ms timing and 10 s startup delay.
Does the TPS3436BFACADDFRQ1 support capacitor-based timing programming?
No, the TPS3436BFACADDFRQ1 uses Pinout Option C, which omits CWD and CRST pins required for capacitor programming. Its tWC (50 ms) and tWDO (100 ms) are factory-fixed per the 'F' and 'F' suffix positions. Capacitor programming is only available on Pinout Options A and B (which include CWD/CRST pins), not on Option C devices like TPS3436BFACADDFRQ1.
How does the WD-EN pin function on the TPS3436BFACADDFRQ1?
On the TPS3436BFACADDFRQ1, WD-EN (Pin 6) is an active-high digital control input. When WD-EN = 1, the watchdog timer operates normally; when WD-EN = 0, monitoring is disabled and WDO remains deasserted regardless of WDI activity. This enables safe firmware updates or debug sessions without software coordination - a hardware-gated disable not possible with capacitor-programmed variants.
What is the maximum open window (tWO) duration achievable with the TPS3436BFACADDFRQ1?
The TPS3436BFACADDFRQ1 supports open/close window ratios up to 511X via SET[1:0] pins. With its fixed tWC = 50 ms, the maximum tWO is 511 × 50 ms = 25.55 s. However, the datasheet limits total tWO to 640 seconds - well above this value - so 25.55 s is the practical maximum. This allows extended supervision windows for slow-booting peripherals while retaining precise fault detection.
Is the TPS3436BFACADDFRQ1 compatible with 1.2 V microcontrollers?
Yes, the TPS3436BFACADDFRQ1 operates from 1.04 V to 6.0 V, making it fully compatible with 1.2 V logic domains. Its VIH threshold is 0.7×VDD (≥0.84 V at 1.2 V), and VIL is 0.3×VDD (≤0.36 V), ensuring clean interfacing with 1.2 V MCUs. The push-pull WDO output drives rail-to-rail, eliminating level-shifters for reset signaling to 1.2 V cores.
TPS3436BFACADDFRQ1 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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
TPS3436BFACADDFRQ1 FAQ
1.How can I place an order for TPS3436BFACADDFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3436BFACADDFRQ1 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 TPS3436BFACADDFRQ1 reliable?
The price and inventory of TPS3436BFACADDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3436BFACADDFRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3436BFACADDFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3436BFACADDFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3436BFACADDFRQ1?
TPS3436BFACADDFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3436BFACADDFRQ1 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 TPS3436BFACADDFRQ1?
For technical support, including TPS3436BFACADDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3436BFACADDFRQ1 requirements.
6.How does Aetrix verify that TPS3436BFACADDFRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3436BFACADDFRQ1 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 TPS3436BFACADDFRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3436BFACADDFRQ1?
All TPS3436BFACADDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3436BFACADDFRQ1, 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 TPS3436BFACADDFRQ1 part is unused and in its original packaging.
Return procedure for TPS3436BFACADDFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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