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onsemi CAT825ZTDI-GT3
- Part No.:
- CAT825ZTDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT825ZTDI-GT3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,761
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Product details
Overview
CAT825ZTDI-GT3 from onsemi is a system supervisory voltage reset IC with watchdog timer and manual reset input, designed for brownout detection and power-on reset in low-voltage embedded systems. It provides a precise 2.32 V reset threshold (±15 mV), 140–400 ms reset timeout, 1.12–3.20 s watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +85°C in TSOT-23-5 package - used in battery-powered microcontroller systems requiring reliable startup and fault recovery.
For engineers reviewing the CAT825ZTDI-GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include reset threshold accuracy at 2.32 V, watchdog timeout tolerance, MR input debouncing behavior, and compatibility with 1.2–5.5 V supply rails in space-constrained designs.
Technical Context
The CAT825ZTDI-GT3 implements a precision bandgap-based voltage reference with 40 ppm/°C tempco and internal hysteresis (5 mV) to ensure stable brownout detection during supply transients. Its digital delay block enforces a minimum 140 ms reset assertion after VCC exceeds VRST, independent of supply ramp rate.
Watchdog functionality relies on edge-triggered WDI input monitoring with automatic timeout recovery; the device enters a repeating low-high WDI strobe pattern when WDI is tri-stated, enabling open-circuit detection. Manual reset is debounced and internally pulled up with 35–75 kΩ resistance, supporting direct pushbutton interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32 V ±15 mV - sets precise brownout detection point for 2.5 V and lower logic systems |
| Reset Timeout | 140–400 ms - ensures sufficient processor stabilization time after power-up or recovery |
| Watchdog Timeout | 1.12–3.20 s - configurable via external timing resistor or firmware strobe interval |
| Supply Range | 1.2–5.5 V - supports operation down to single-cell LiFePO₄ or dual-cell alkaline systems |
| Operating Temp | −40°C to +85°C - qualified for industrial and portable equipment environments |
| RESET Output | CMOS push-pull, VOL ≤0.3 V @ 1.2 mA - drives standard logic inputs without pull-up resistors |
| MR Pullup | 52 kΩ typical - enables direct mechanical button connection with <1 µA standby current |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 2.90 mm × 1.60 mm × 0.95 mm, RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Accepts 1.2–5.5 V; powers internal reference, timer, and output stage |
| WDI | Watchdog timer input | Edge-sensitive; timeout triggered if no transition occurs within 1.12–3.20 s |
| RESET | Active-low reset output | Push-pull CMOS; asserts low during power-up, brownout, watchdog timeout, or MR activation |
| GND | Ground reference | Return path for all internal circuits and output sink current |
| MR | Manual reset input | Internally pulled high; reset asserted when driven below 0.3×VCC for ≥1 µs |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.32 V with ±15 mV tolerance and 40 ppm/°C drift - eliminates need for external trimming in 2.5 V rail monitoring |
| Integrated watchdog timer | Self-contained 1.12–3.20 s timeout with automatic open-WDI detection - reduces firmware watchdog management overhead |
| Debounced manual reset | 5 µs MR-to-RESET delay and 100 ns noise immunity - prevents false resets from switch bounce or EMI |
| Low-voltage operation | Valid RESET output down to VCC = 1.0 V - ensures deterministic reset assertion during deep brownout |
| Minimal external components | No external capacitors or resistors required for basic reset/watchdog function - reduces BOM count and PCB area |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ultra-low-power MCU entering deep sleep between readings. IC Role / Device Role / Timing Role: Supervisory reset IC asserting RESET until VCC stabilizes post-wakeup, then monitoring for brownout during RF transmission. Use Value: Prevents MCU lockup during 2.3 V battery sag using 2.32 V threshold; 140 ms timeout aligns with LDO settling time. |
Use Scenario: DIN-rail mounted analog input module operating from 24 VDC supply with local 3.3 V regulation. IC Role / Device Role / Timing Role: System supervisor detecting 3.3 V rail collapse and issuing hardware reset to ARM Cortex-M4 controller. Use Value: 2.32 V threshold matches regulated 2.5 V auxiliary rail; watchdog guards against firmware hang during CAN bus error recovery. |
| Smart Meter Communication Units | Wearable Fitness Trackers |
Use Scenario: NB-IoT modem subsystem powered by energy-harvesting circuit with intermittent 2.2–2.8 V output. IC Role / Device Role / Timing Role: Voltage supervisor ensuring clean boot only when rail exceeds 2.32 V, with MR enabling field firmware update reset. Use Value: Tight 15 mV threshold tolerance avoids premature reset during harvest voltage ripple; MR pullup eliminates external resistor. |
Use Scenario: Coin-cell powered activity tracker with BLE SoC cycling between active and sub-µA sleep states. IC Role / Device Role / Timing Role: Reset generator maintaining known state during coin-cell voltage decay below 2.4 V, with watchdog verifying sensor fusion loop execution. Use Value: 2.32 V trip point matches end-of-life battery voltage; 1.12 s watchdog timeout fits within 2 s motion-detection window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823ZTR | 2.32 V reset threshold, same TSOT-23-5 package, but 200 ms fixed reset timeout (no min/max range) | Lacks watchdog timer - requires external circuit or firmware for fault recovery beyond power failure | Select when watchdog functionality is unnecessary and tighter timeout consistency is preferred |
| TPS3808G12QDBVRQ1 | 2.33 V threshold, automotive-grade (−40°C to +125°C), 200 ms timeout, integrated watchdog with programmable period | Higher quiescent current (1.8 µA vs. 4 µA), AEC-Q100 qualified - over-specified for commercial portable use | Select for automotive or extended-temp deployments where qualification and watchdog flexibility outweigh cost and size |
Compared with MAX823ZTR and TPS3808G12QDBVRQ1, the CAT825ZTDI-GT3 offers optimal balance of precision 2.32 V threshold, factory-trimmed watchdog timeout, and minimal footprint for cost-sensitive industrial and portable designs - without automotive overhead or missing supervision features.
Availability
CAT825ZTDI-GT3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and wearable fitness trackers requiring stable component supply across long production lifecycles.
Supply support for CAT825ZTDI-GT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT825ZTDI-GT3 belongs to onsemi's system supervisory IC product line, engineered specifically for reliable power-on reset, brownout protection, and watchdog supervision in space-constrained, battery-operated embedded systems.
FAQ
What is the exact reset threshold voltage of the CAT825ZTDI-GT3?
The CAT825ZTDI-GT3 has a factory-trimmed reset threshold of 2.32 V, with guaranteed limits of 2.25 V (min) and 2.38 V (max) across −40°C to +85°C ambient temperature. This value is specified in Table 3 of the official onsemi datasheet and applies directly to the CAT825ZTDI-GT3 variant - not inferred from other CAT82x family members.
Does the CAT825ZTDI-GT3 include a watchdog timer function?
Yes, the CAT825ZTDI-GT3 includes a fully integrated watchdog timer with a nominal timeout period of 1.60 s (range 1.12–3.20 s). The WDI input detects transitions and resets the timer on each valid edge; if no transition occurs within the timeout window, the device asserts RESET. This function is confirmed in the Functional Description section and Figure 6 of the CAT823/CAT824 datasheet.
What is the package type and pin configuration of the CAT825ZTDI-GT3?
The CAT825ZTDI-GT3 uses the TSOT-23-5 package (Case 419AE), with pins arranged as VCC–WDI–RESET–GND–MR in top-view order. Pin functions are explicitly defined in the "PIN FUNCTIONS" and "PIN CONNECTIONS" sections of the datasheet, and the marking "ETA" on the top surface confirms the Z-version (2.32 V threshold) in this package.
Can the CAT825ZTDI-GT3 operate from a 1.8 V supply?
Yes, the CAT825ZTDI-GT3 supports VCC down to 1.2 V across its full operating temperature range (−40°C to +85°C), per Table 2 of the datasheet. At 1.8 V, it maintains valid RESET output levels (VOL ≤0.3 V, VOH ≥0.8×VCC) and functional watchdog and MR inputs - making it suitable for single-cell lithium or regulated low-voltage rails.
Is the CAT825ZTDI-GT3 pin-compatible with MAX823/824 devices?
Yes, the CAT825ZTDI-GT3 is pin- and function-compatible with the MAX823/824 series, as stated in the "Features" section of the datasheet. Both share identical TSOT-23-5 pinout (VCC–WDI–RESET–GND–MR), matching electrical characteristics including reset threshold, timeout, and drive strength - enabling drop-in replacement in existing designs.
CAT825ZTDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT825ZTDI-GT3 FAQ
1.How can I place an order for CAT825ZTDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT825ZTDI-GT3 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 CAT825ZTDI-GT3 reliable?
The price and inventory of CAT825ZTDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT825ZTDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT825ZTDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT825ZTDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT825ZTDI-GT3?
CAT825ZTDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT825ZTDI-GT3 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 CAT825ZTDI-GT3?
For technical support, including CAT825ZTDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT825ZTDI-GT3 requirements.
6.How does Aetrix verify that CAT825ZTDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT825ZTDI-GT3 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 CAT825ZTDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT825ZTDI-GT3?
All CAT825ZTDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT825ZTDI-GT3, 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 CAT825ZTDI-GT3 part is unused and in its original packaging.
Return procedure for CAT825ZTDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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