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Texas Instruments 2T13K33MDBVREPG4
- Part No.:
- 2T13K33MDBVREPG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
2T13K33MDBVREPG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,869
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Product details
Overview
2T13K33MDBVREPG4 from Texas Instruments is a radiation-hardened, extended-temperature window watchdog supervisor IC for safety-critical processor systems. It provides power-on reset with 25 ms delay, precision 2.93 V supply monitoring, open-drain RESET output, and programmable window-watchdog timing via WDT/WDR pins. Used in automotive engine control units and avionics power management.
For engineers reviewing the 2T13K33MDBVREPG4 datasheet, 2T13K33MDBVREPG4 pinout, 2T13K33MDBVREPG4 application, or 2T13K33MDBVREPG4 equivalent, key selection criteria include its –55°C to 125°C operation, 9 µA typical supply current, SOT-23 (DBV) 6-pin package, and dual-boundary watchdog architecture supporting both fixed and capacitor-programmed timeout modes.
Technical Context
The 2T13K33MDBVREPG4 implements a dual-threshold window-watchdog using internal oscillator-based timing, where WDR selects lower-bound ratio (1:31.8 or 1:127.7) and WDT configures upper-bound timeout (0.25 s, 2.5 s, or external capacitor). Its reset logic asserts open-drain RESET low when VDD falls below 2.93 V or watchdog boundaries are violated.
It integrates a bandgap voltage reference, rising-edge detection on WDI, and reset timer with 25 ms fixed delay after VDD exceeds threshold. All functions operate without external components except optional capacitor on WDT, and it supports direct connection of WDT/WDR to VDD or GND for mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports 3.3 V systems with 1 V margin above nominal rail |
| Threshold Voltage (VIT) | 2.93 V (typ), ±70 mV over full temperature - ensures reliable brownout detection at 3.3 V supply |
| Reset Delay Time | 25 ms (typ), 15–40 ms over temperature - guarantees sufficient processor initialization time |
| Supply Current | 9 µA (typ) at 5 V - enables ultra-low-power supervision in battery-backed systems |
| Watchdog Window Ratio | Configurable 1:31.8 or 1:127.7 - allows tight or wide software execution timing windows |
| Output Type | Open-drain RESET - permits wired-OR configuration and flexible pull-up voltage selection |
| Operating Temperature | –55°C to 125°C - qualified per JEDEC for automotive and aerospace environments |
Pinout & Package
SOT-23 (DBV) 6-pin package, 3.0 mm × 3.0 mm footprint, 1.45 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: WDI | Watchdog Input | Rising-edge-triggered input; resets internal timers and starts new watchdog window |
| 2: GND | Ground Reference | Primary return path for all internal circuitry and output sink current |
| 3: WDT | Watchdog Timeout Control | Selects upper watchdog boundary: GND = 0.25 s, VDD = 2.5 s, capacitor = programmable |
| 4: VDD | Supply & Monitoring Input | Power source and monitored rail; RESET asserted if VDD < 2.93 V |
| 5: WDR | Watchdog Ratio Control | Selects lower boundary ratio: GND = 1:31.8, VDD = 1:127.7 |
| 6: RESET | Open-Drain Reset Output | Active-low reset signal; requires external pull-up; sinks up to 5 mA |
Key Features
| Feature | Design Value |
|---|---|
| Window-Watchdog Architecture | Enables detection of both software hang (no WDI pulse) and runaway execution (early/late WDI pulse) |
| Programmable Timing Boundaries | WDT/WDR pins allow four fixed modes or capacitor-based fine-tuning without firmware changes |
| Extended Temperature Operation | –55°C to 125°C qualification includes HAST, temperature cycling, and bond intermetallic life testing |
| Low-Power Supervision | 9 µA typical IDD enables use in always-on subsystems without compromising battery life |
| Fixed Power-On Reset Delay | 25 ms typ delay ensures stable clock and memory initialization before release of RESET |
Applications
| Engine Control Unit (ECU) | Avionics Power Sequencing |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply and validates firmware execution timing during engine start-up and runtime. IC Role / Device Role / Timing Role: Window watchdog supervisor enforcing dual-boundary software liveness checks and brownout protection. Use Value: Prevents undetected ECU lockup by asserting RESET if WDI pulses fall outside 19.6 ms–2.5 s window (WDR=VDD, WDT=VDD). | Use Scenario: Controls power-up sequence and runtime health of flight-critical DSPs in airborne navigation systems. IC Role / Device Role / Timing Role: Precision voltage monitor and programmable watchdog ensuring deterministic reset behavior across extreme thermal cycles. Use Value: Guarantees 2.93 V threshold accuracy over –55°C to 125°C, eliminating false resets during rapid temperature transients. |
| Railway Signaling Controller | Medical Imaging Power Management |
Use Scenario: Supervises dual-redundant ARM Cortex-M7 processors in wayside signaling logic units. IC Role / Device Role / Timing Role: Safety-certified reset generator with window-watchdog enforcing SIL-3 compliant software timing margins. Use Value: Supports IEC 61508 compliance via configurable watchdog window (e.g., 6.27–9.46 ms lower bound with WDR=GND, WDT=GND). | Use Scenario: Manages power sequencing and runtime integrity of FPGA-based image reconstruction engines in MRI systems. IC Role / Device Role / Timing Role: Low-current (9 µA) supervisor enabling continuous monitoring during standby without draining backup batteries. Use Value: Extends battery life in portable MRI subsystems while maintaining 25 ms POR delay and 2.93 V supply monitoring accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window watchdog supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3813K33MDBVREP | Same die, identical electrical specs, same DBV package; differs only in tape-and-reel packaging (3000 pcs vs. 2T13K33MDBVREPG4's 3000 pcs large T&R) and marking (PLGM vs. PLGM + G4 suffix) | No functional difference; suitable for identical safety-critical designs requiring TI's enhanced product pedigree | Select when standard TI production part number is required for BOM alignment or procurement system compatibility |
| MAX6373KA33+T | Fixed 3.3 V threshold, no window-watchdog; offers push-pull RESET and 140 ms reset timeout - lacks dual-boundary timing enforcement | Applicable only in non-safety-critical systems where simple power-on reset suffices without software liveness checking | Choose only if window-watchdog functionality is unnecessary and push-pull output is preferred over open-drain |
Compared with 2T13K33MDBVREPG4, TPS3813K33MDBVREP delivers identical supervision performance with identical qualification pedigree but uses standard TI ordering nomenclature, while MAX6373KA33+T omits window-watchdog capability entirely-making it unsuitable for applications requiring detection of premature or delayed software triggers.
Availability
2T13K33MDBVREPG4 is available at Aetrix Electronics and suitable for automotive engine control units, avionics power sequencing, and railway signaling controllers requiring stable component supply across extended temperature ranges and long lifecycle support.
Supply support for 2T13K33MDBVREPG4 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 high-reliability components for industrial, automotive, and aerospace markets.
The TPS3813 family was designed specifically for safety-critical processor supervision, integrating window-watchdog timing, precision voltage monitoring, and extended-temperature qualification into a single 6-pin SOT-23 device.
FAQ
What is the exact supply voltage threshold for 2T13K33MDBVREPG4?
The 2T13K33MDBVREPG4 has a nominal supply voltage threshold (VIT) of 2.93 V, with a guaranteed range of 2.80 V to 3.10 V over the full –55°C to 125°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table of the SGLS343A datasheet. The 2T13K33MDBVREPG4 is part of the TPS3813K33-EP series, where "K33" explicitly denotes the 2.93 V threshold variant.
Does 2T13K33MDBVREPG4 support capacitor-programmed watchdog timeout?
Yes, 2T13K33MDBVREPG4 supports capacitor-programmed watchdog timeout via the WDT pin. Connecting an external capacitor (47 pF to 63 nF) between WDT and GND sets the upper watchdog boundary using the formula: twindow,typ = (C(ext) ÷ 15.55 pF + 1) × 6.25 ms. The lower boundary is then derived based on WDR pin state (GND or VDD), enabling precise tuning of the window frame for specific software execution profiles.
What is the function of the WDR pin on 2T13K33MDBVREPG4?
The WDR (Watchdog Ratio) pin on 2T13K33MDBVREPG4 selects the lower boundary ratio of the window-watchdog timer. When WDR = GND, the ratio is 1:31.8 relative to the upper timeout; when WDR = VDD, it is 1:127.7. This determines how early a WDI trigger must occur within the window to avoid reset assertion. The 2T13K33MDBVREPG4 datasheet specifies these ratios in the "IMPLEMENTED WINDOW-WATCHDOG SETTINGS" table.
Is 2T13K33MDBVREPG4 pin-compatible with other TPS3813 variants?
Yes, 2T13K33MDBVREPG4 is pin-compatible with all members of the TPS3813 family in the SOT-23 (DBV) package, including TPS3813J25MDBVREP, TPS3813L30MDBVREP, and TPS3813I50MDBVREP. All share identical 6-pin layout, terminal functions (WDI, GND, WDT, VDD, WDR, RESET), and mechanical dimensions. Only the threshold voltage and marking differ between variants - no PCB redesign is needed when substituting within the family.
What does the "G4" suffix in 2T13K33MDBVREPG4 indicate?
The "G4" suffix in 2T13K33MDBVREPG4 denotes a specific tape-and-reel packaging variant per TI's ordering nomenclature: it indicates large tape-and-reel packaging (3000 pcs/reel), RoHS-compliant NIPDAU lead finish, and MSL Level-1 rating. This suffix distinguishes it from other packaging options like TPS3813K33MDBVREP (same die, standard reel) but does not affect electrical performance, qualification, or functionality of the 2T13K33MDBVREPG4 device itself.
2T13K33MDBVREPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
2T13K33MDBVREPG4 FAQ
1.How can I place an order for 2T13K33MDBVREPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2T13K33MDBVREPG4 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 2T13K33MDBVREPG4 reliable?
The price and inventory of 2T13K33MDBVREPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2T13K33MDBVREPG4 is usually 5 days.
3.What payment methods are accepted for 2T13K33MDBVREPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2T13K33MDBVREPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2T13K33MDBVREPG4?
2T13K33MDBVREPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2T13K33MDBVREPG4 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 2T13K33MDBVREPG4?
For technical support, including 2T13K33MDBVREPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2T13K33MDBVREPG4 requirements.
6.How does Aetrix verify that 2T13K33MDBVREPG4 is sourced from the original manufacturer or authorized distributors?
All 2T13K33MDBVREPG4 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 2T13K33MDBVREPG4 meets industry standards.
7.What is the process for return or replacement of 2T13K33MDBVREPG4?
All 2T13K33MDBVREPG4 units undergo pre-shipment inspection (PSI). If there is an issue with 2T13K33MDBVREPG4, 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 2T13K33MDBVREPG4 part is unused and in its original packaging.
Return procedure for 2T13K33MDBVREPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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