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onsemi CAT825SSDI-GT3
- Part No.:
- CAT825SSDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAT825SSDI-GT3.pdf
- Description:
- IC SUPERVISOR MPU 2.93V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,895
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Product details
Overview
CAT825SSDI-GT3 from onsemi is a system supervisory voltage reset IC with integrated watchdog timer and manual reset input, designed for brownout detection and power-on reset sequencing in microcontroller-based systems. It features a 2.93 V reset threshold, 140–400 ms reset timeout, 1.12–3.20 s watchdog timeout, TSOT-23-5 package, and operates across −40°C to +85°C.
For engineers reviewing the CAT825SSDI-GT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, functional role in power monitoring, watchdog timing behavior, manual reset debouncing, and validated alternatives for embedded system reliability design.
Technical Context
The CAT825SSDI-GT3 implements a precision bandgap-based voltage reference with ±1.5% reset threshold accuracy (2.93 V nominal), 40 ppm/°C tempco, and 5 mV hysteresis to reject supply noise. Its digital delay circuit enforces a minimum 140 ms reset assertion after VCC exceeds VRST, ensuring stable power-up of MCUs before release.
Watchdog functionality monitors WDI transitions with a 1.12–3.20 s timeout window; absence of edge triggers a full reset cycle. The MR input includes internal 52 kΩ pull-up and 1 µs noise immunity, enabling direct pushbutton interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (±1.5%) - precisely triggers reset during 3.3 V system brownout at defined undervoltage level |
| Reset Timeout | 140–400 ms - guarantees MCU core and peripherals stabilize before release from reset |
| Watchdog Timeout | 1.12–3.20 s - provides configurable software liveliness monitoring interval |
| Supply Range | 2.0–3.6 V - supports low-voltage operation in battery-powered and portable 3.3 V designs |
| Operating Temp | −40°C to +85°C - qualified for industrial ambient environments without derating |
| Output Type | CMOS push-pull active-low RESET - drives standard logic inputs directly; sinks 1.2 mA at 0.3 V |
| MR Pull-up | 52 kΩ internal - enables direct mechanical pushbutton connection with no external resistor |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 2.90 mm × 1.60 mm × 0.95 mm, RoHS-compliant, NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 2.0–3.6 V; powers internal reference, timer, and output stage |
| WDI | Watchdog timer input | Edge-triggered; requires low-to-high or high-to-low transition within timeout window to prevent reset |
| RESET | Active-low reset output | CMOS push-pull; asserts low during power-up, brownout, watchdog timeout, or MR activation |
| GND | Ground reference | Return path for all internal circuits and output current; must be low-impedance |
| MR | Manual reset input | Active-low; internally pulled up to VCC via 52 kΩ; debounced and latched for ≥140 ms reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Brownout detection with 2.93 V threshold | Enables reliable reset initiation in 3.3 V systems before logic corruption occurs |
| 140 ms minimum reset timeout | Guarantees sufficient time for power supply settling and MCU oscillator stabilization |
| Watchdog timeout programmable via WDI edge rate | Allows software-controlled liveliness verification without external timing components |
| Integrated 52 kΩ MR pull-up | Eliminates need for external pull-up resistor when using pushbutton reset |
| Push-pull RESET output | Drives standard CMOS inputs directly; no external pull-up required for most microcontrollers |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Power cycling and firmware crash recovery in DIN-rail mounted controllers exposed to line transients. IC Role / Device Role / Timing Role: System supervisory IC providing power-on reset, brownout detection, and watchdog supervision of ARM Cortex-M4 host processor. Use Value: Prevents corrupted register states during 3.3 V rail dips; 140 ms timeout ensures FPGA configuration completes before MCU boot. |
Use Scenario: Battery-operated vital sign monitor requiring fail-safe restart after low-power sleep mode exit. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog initiator that resets the MSP430F5xx MCU if sensor data acquisition stalls. Use Value: 2.93 V threshold aligns with Li-ion discharge curve; WDI strobing confirms real-time OS task execution. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Tamper-resistant meter with isolated power domains and dual-supply monitoring. IC Role / Device Role / Timing Role: Primary reset generator for metrology SoC, asserting RESET until both 3.3 V and 1.8 V rails are valid. Use Value: Internal 52 kΩ MR pull-up simplifies tamper-detection button interface; 40 ppm/°C tempco maintains accuracy over wide temperature range. |
Use Scenario: Low-voltage environment where 12 V battery drops to 6 V during cranking, affecting 3.3 V LDO output. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and watchdog-initiated recovery of CAN-enabled microcontroller. Use Value: 2.0–3.6 V operating range accommodates degraded LDO output; push-pull RESET avoids weak pull-up limitations in noisy automotive ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SETD+T | 3.08 V reset threshold, 200 ms fixed timeout, same TSOT-23-5 pinout, but no MR input | Lacks manual reset capability; suitable only where software or external switch control is unavailable | Select when watchdog-only supervision suffices and board layout cannot accommodate MR routing |
| TPS3808G33DBVR | 3.3 V reset threshold, 200 ms timeout, adjustable watchdog (0.5–10 s), no MR input, higher quiescent current (12 µA vs. 4 µA) | Offers wider watchdog range but requires external RC for adjustment; no pushbutton support | Choose for extended watchdog flexibility in new designs where MR is not required and layout allows RC placement |
Compared with CAT825SSDI-GT3, MAX823SETD+T omits manual reset-limiting field serviceability-while TPS3808G33DBVR trades MR simplicity for programmable watchdog tuning, increasing BOM count and layout complexity.
Availability
CAT825SSDI-GT3 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAT825SSDI-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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT825SSDI-GT3 belongs to onsemi's system supervisory IC product line, engineered specifically for robust power-on reset, brownout protection, and software watchdog supervision in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the CAT825SSDI-GT3?
The CAT825SSDI-GT3 has a nominal reset threshold of 2.93 V, with guaranteed tolerance of ±1.5% over −40°C to +85°C. This value is factory-trimmed and specified in Table 3 of the official onsemi datasheet. The CAT825SSDI-GT3 uses an internal bandgap reference to maintain stability, and its 40 ppm/°C tempco ensures minimal drift across operating temperature.
Does the CAT825SSDI-GT3 include a manual reset input?
Yes, the CAT825SSDI-GT3 includes a dedicated MR (Manual Reset) input pin. It is internally pulled up to VCC with a 52 kΩ resistor and responds to a low-level assertion by generating a minimum 140 ms active-low RESET pulse. This feature enables direct connection to a mechanical pushbutton without external components, and the CAT825SSDI-GT3 debounces the MR signal internally to reject contact bounce.
What is the watchdog timeout range for the CAT825SSDI-GT3?
The CAT825SSDI-GT3 watchdog timeout is specified from 1.12 s to 3.20 s, depending on process and temperature variation. The timeout begins after RESET becomes inactive and resets upon each valid edge (low-to-high or high-to-low) on the WDI pin. If no edge occurs within the timeout window, the CAT825SSDI-GT3 asserts RESET for 140–400 ms. This behavior is confirmed in the Functional Description section of the onsemi datasheet.
Is the CAT825SSDI-GT3 pin-compatible with MAX823/824 devices?
No-the CAT825SSDI-GT3 is not pin-compatible with MAX823/824. While both families share functional similarity and the same TSOT-23-5 package footprint, the pin assignments differ: CAT825SSDI-GT3 places MR on pin 5 and RESET on pin 3, whereas MAX823 uses pin 5 for RESET and pin 3 for MR. Interchanging them without PCB revision will cause incorrect reset behavior. Always verify pin mapping using the official onsemi pinout diagram for CAT825SSDI-GT3.
What package type and dimensions does the CAT825SSDI-GT3 use?
The CAT825SSDI-GT3 uses the TSOT-23-5 package (Case 419AE), measuring 2.90 mm × 1.60 mm × 0.95 mm with 0.95 mm pitch. It features NiPdAu lead finish, complies with RoHS, and meets JEDEC MO-193 mechanical standards. The top mark "ETA" identifies the CAT823S variant (2.93 V), and the device is supplied in 3,000-piece tape-and-reel format-confirmed in the Ordering Information table of the onsemi datasheet.
CAT825SSDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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:
- SC-88A (SC-70-5)
CAT825SSDI-GT3 FAQ
1.How can I place an order for CAT825SSDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT825SSDI-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 CAT825SSDI-GT3 reliable?
The price and inventory of CAT825SSDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT825SSDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT825SSDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT825SSDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT825SSDI-GT3?
CAT825SSDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT825SSDI-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 CAT825SSDI-GT3?
For technical support, including CAT825SSDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT825SSDI-GT3 requirements.
6.How does Aetrix verify that CAT825SSDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT825SSDI-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 CAT825SSDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT825SSDI-GT3?
All CAT825SSDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT825SSDI-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 CAT825SSDI-GT3 part is unused and in its original packaging.
Return procedure for CAT825SSDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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