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Texas Instruments TPS3813K33MDBVREP
- Part No.:
- TPS3813K33MDBVREP
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
TPS3813K33MDBVREP.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
TPS3813K33MDBVREP from Texas Instruments is a radiation-hardened, extended-temperature window watchdog supervisor IC designed for safety-critical processor initialization and timing supervision in DSP/microcontroller systems. It features a fixed 2.93 V supply voltage monitor (VIT), 25 ms power-on reset delay, 9 µA typical supply current, open-drain RESET output, and programmable window-watchdog with dual boundary control via WDT/WDR pins - deployed in automotive, avionics, and medical healing systems.
For engineers reviewing the TPS3813K33MDBVREP datasheet, TPS3813K33MDBVREP pinout, TPS3813K33MDBVREP application, or TPS3813K33MDBVREP equivalent, key selection criteria include its −55°C to 125°C operation, SOT-23 (DBV) 6-pin package, window ratio configurability (1:25.8 to 1:127.7), watchdog timeout range (0.25 s to 2.5 s), and compliance with enhanced product pedigree requirements for DMS and lifecycle continuity.
Technical Context
The TPS3813K33MDBVREP implements a dual-boundary window-watchdog architecture where the lower boundary is set by WDR (GND/VDD) and upper boundary by WDT (GND/VDD/external capacitor), enabling precise software execution monitoring. Its internal bandgap reference and oscillator drive both the power-on reset timer and watchdog timing logic without external components.
It integrates a fixed-threshold voltage detector (2.93 V ±70 mV over full temperature range), hysteresis of 40 mV, and open-drain RESET output capable of sinking 5 mA at 0.4 V. All inputs (WDI, WDR, WDT) support rail-to-rail operation with input leakage <±1000 nA across −55°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT Threshold | 2.93 V (nominal); ensures reliable reset assertion when VDD drops below 2.8–3.1 V across full temperature range |
| Power-On Reset Delay | 25 ms (typical); guarantees stable system initialization after VDD exceeds 1.1 V and rises above VIT |
| Supply Current | 9 µA (typical at VDD = 2 V); enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Watchdog Timeout Range | 0.25 s or 2.5 s (fixed modes), or programmable up to ~3 s using external capacitor (47 pF–63 nF) |
| Window Ratio Options | Configurable ratios: 1:25.8, 1:31.8, 1:64.5, 1:124.9, or 1:127.7 - defines minimum retrigger interval within timeout window |
| Operating Temperature | −55°C to 125°C; qualified per JEDEC HAST, temperature cycling, and electromigration standards for space-grade reliability |
| Package | SOT-23 (DBV), 3.0 mm × 3.0 mm footprint, 1.45 mm max height; compatible with standard pick-and-place and reflow processes |
Pinout & Package
SOT-23 (DBV) 6-pin plastic package, 3.0 mm × 3.0 mm body, 1.45 mm maximum height, lead finish NIPDAU, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Rising-edge-triggered input; resets internal watchdog timers on each valid pulse (min 50 ns width) |
| 2 - GND | Ground Reference | Primary return path for all internal circuitry and output sink current; requires low-impedance PCB connection |
| 3 - WDT | Watchdog Timeout Control | Selects upper watchdog boundary: GND = 0.25 s, VDD = 2.5 s, or external capacitor for programmable timeout |
| 4 - VDD | Supply & Supervised Rail | Input power (2–6 V) and monitored voltage source; internal comparator detects undervoltage relative to 2.93 V threshold |
| 5 - WDR | Watchdog Window Ratio | Selects lower boundary ratio: GND = narrow window (e.g., 1:31.8), VDD = wide window (e.g., 1:127.7) |
| 6 - RESET | Open-Drain Reset Output | Active-low reset signal; requires external pull-up; sinks up to 5 mA at 0.4 V for driving logic or microcontroller reset pins |
Key Features
| Feature | Design Value |
|---|---|
| Window-Watchdog Architecture | Dual-boundary timing supervision prevents both early and late software hangs - detects missed or premature WDI pulses |
| Extended Temperature Operation | Qualified from −55°C to 125°C with HAST, temperature cycle, and electromigration testing for aerospace and defense use |
| Low-Power Supervision | 9 µA typical supply current enables integration into always-on subsystems without compromising battery life |
| No External Components Required | Fixed 25 ms POR delay and factory-trimmed 2.93 V threshold eliminate need for RC networks or precision resistors |
| Configurable Watchdog Flexibility | Four preset timing modes + capacitor-programmable option provide scalable supervision granularity across diverse firmware architectures |
Applications
| Automotive Engine Control Unit (ECU) | Aerospace Flight Management System |
|---|---|
Use Scenario: Real-time monitoring of engine control microcontroller during cold start and transient load conditions. IC Role / Device Role / Timing Role: Window-watchdog supervisor enforcing strict software execution timing boundaries while providing 25 ms POR for ECU boot sequence. Use Value: Prevents unsafe operation due to firmware lockup or timing skew under −40°C to 125°C ambient extremes. |
Use Scenario: Supervision of dual-redundant flight computers in unmanned aerial vehicles operating at high altitude. IC Role / Device Role / Timing Role: Safety-critical reset generator with radiation-tolerant design and validated 125°C operation for avionics-grade reliability. Use Value: Ensures deterministic fail-safe response during sensor fusion algorithm stalls, meeting DO-254/DO-178C certification requirements. |
| Medical Imaging Power Supply Controller | Industrial Programmable Logic Controller (PLC) |
Use Scenario: Monitoring FPGA-based image reconstruction controller in MRI power supply subsystems. IC Role / Device Role / Timing Role: Precision 2.93 V supply monitor combined with programmable watchdog window to validate real-time processing loops. Use Value: Guarantees immediate reset upon voltage droop or software hang, preventing corrupted scan data or thermal runaway. |
Use Scenario: Supervising ARM Cortex-M7 core in modular PLC backplane with distributed I/O modules. IC Role / Device Role / Timing Role: Dual-function supervisor: POR generator for deterministic boot and window-watchdog for cyclic task validation. Use Value: Eliminates need for discrete reset IC + external watchdog timer, reducing BOM count and board area in DIN-rail mounted enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window-watchdog supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3813L30MDBVREP | 2.64 V threshold (vs. 2.93 V); identical pinout, timing, and package | Targeted at 2.7–3.0 V supply rails; unsuitable for 3.3 V systems requiring tighter margin above VIT | Select when supervising 2.8 V nominal supplies where 2.64 V VIT provides optimal noise immunity. |
| TPS3813I50MDBVREP | 4.55 V threshold (vs. 2.93 V); same DBV package and watchdog functionality | Designed for 5 V logic domains; incompatible with 3.3 V systems due to higher trip point and potential false resets | Choose only for legacy 5 V microcontroller platforms requiring window-watchdog supervision with 4.45–4.65 V detection range. |
Compared with TPS3813L30MDBVREP and TPS3813I50MDBVREP, the TPS3813K33MDBVREP offers optimal voltage margin for 3.3 V systems (2.93 V threshold with 40 mV hysteresis), ensuring robust operation against ripple and load transients while maintaining full watchdog configurability and −55°C to 125°C qualification.
Availability
TPS3813K33MDBVREP is available at Aetrix Electronics and suitable for automotive engine control units, aerospace flight management systems, medical imaging power controllers, and industrial PLCs requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for TPS3813K33MDBVREP 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, with decades of heritage in automotive, industrial, and aerospace markets.
The TPS3813 family was engineered specifically for safety-critical processor supervision - delivering window-watchdog timing integrity, extended-temperature qualification, and enhanced manufacturing pedigree for mission-critical electronics.
FAQ
What is the exact supply voltage threshold for TPS3813K33MDBVREP?
The TPS3813K33MDBVREP has a nominal supply voltage threshold (VIT) of 2.93 V, with a guaranteed range of 2.80 V to 3.10 V across the full −55°C to 125°C operating temperature range. This value is factory-trimmed and does not require external calibration. The device asserts RESET when VDD falls below this threshold and releases it after VDD rises above VIT plus hysteresis (40 mV).
How is the watchdog window ratio configured on TPS3813K33MDBVREP?
The watchdog window ratio on TPS3813K33MDBVREP is set by the WDR pin: connecting WDR to GND selects narrow-window ratios (e.g., 1:31.8), while connecting WDR to VDD selects wide-window ratios (e.g., 1:127.7). These ratios define the lower boundary of the watchdog time window relative to the upper timeout set by WDT. No external components are needed for these configurations.
Does TPS3813K33MDBVREP support external capacitor programming of the watchdog timeout?
Yes, TPS3813K33MDBVREP supports external capacitor programming of the upper watchdog timeout by connecting a capacitor between the WDT pin and GND. Capacitor values from 47 pF to 63 nF yield timeout ranges up to ~3 s. The formula is twindow,typ = (Cext ÷ 15.55 pF + 1) × 6.25 ms, with corresponding lower boundary scaling based on WDR state.
What is the power-on reset delay specification for TPS3813K33MDBVREP?
The TPS3813K33MDBVREP provides a fixed power-on reset delay of 25 ms (typical), starting when VDD rises above the threshold voltage (VIT). The delay range is specified as 15 ms to 40 ms across the full temperature range. This ensures sufficient time for power rail stabilization and microcontroller internal clock startup before releasing the RESET signal.
Is TPS3813K33MDBVREP compatible with standard SOT-23 assembly processes?
Yes, TPS3813K33MDBVREP uses the industry-standard SOT-23 (DBV) package: 3.0 mm × 3.0 mm body, 1.45 mm max height, NIPDAU lead finish, and MSL Level-1 rating. It supports standard reflow profiles up to 260°C peak and is compatible with IPC-7351 land patterns, stencil designs, and automated optical inspection workflows.
TPS3813K33MDBVREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TPS3813K33MDBVREP FAQ
1.How can I place an order for TPS3813K33MDBVREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3813K33MDBVREP 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 TPS3813K33MDBVREP reliable?
The price and inventory of TPS3813K33MDBVREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3813K33MDBVREP is usually 5 days.
3.What payment methods are accepted for TPS3813K33MDBVREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3813K33MDBVREP transactions.
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4.How is shipping managed for TPS3813K33MDBVREP?
TPS3813K33MDBVREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3813K33MDBVREP 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 TPS3813K33MDBVREP?
For technical support, including TPS3813K33MDBVREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3813K33MDBVREP requirements.
6.How does Aetrix verify that TPS3813K33MDBVREP is sourced from the original manufacturer or authorized distributors?
All TPS3813K33MDBVREP 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 TPS3813K33MDBVREP meets industry standards.
7.What is the process for return or replacement of TPS3813K33MDBVREP?
All TPS3813K33MDBVREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS3813K33MDBVREP, 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 TPS3813K33MDBVREP part is unused and in its original packaging.
Return procedure for TPS3813K33MDBVREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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