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onsemi CAT825MSDI-GT3
- Part No.:
- CAT825MSDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAT825MSDI-GT3.pdf
- Description:
- IC SUPERVISOR MPU 4.38V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:16,000
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Product details
Overview
CAT825MSDI-GT3 from onsemi is a system supervisory voltage reset IC with integrated watchdog timer and manual reset input, designed for reliable power-on reset, brownout detection, and processor supervision in 4.38 V nominal systems. It delivers a CMOS push-pull active-low RESET output, features 140–400 ms reset timeout, 1.12–3.20 s watchdog timeout, ±40 ppm/°C reset threshold tempco, and operates across −40°C to +85°C.
For engineers reviewing the CAT825MSDI-GT3 datasheet, pinout, applications, or equivalent options, this device serves as a precision voltage monitor and reset supervisor for microcontroller-based embedded systems requiring deterministic startup, fault recovery, and external reset override capability.
Technical Context
The CAT825MSDI-GT3 implements a precision bandgap reference with comparator-based voltage monitoring, digital delay logic for reset timing control, and debounced level-sense circuitry for MR and WDI inputs. Its internal 52 kΩ pull-up on MR enables direct pushbutton interfacing without external components.
Watchdog functionality resets the system if WDI transitions are missed within 1.12–3.20 s; the timer restarts on each valid edge. Reset assertion persists for ≥140 ms after VCC exceeds VRST = 4.38 V (min 4.25 V, max 4.50 V), ensuring stable power supply and processor initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VRST) | 4.38 V (typ), 4.25–4.50 V range at −40°C to +85°C - sets precise brownout detection point for 4.5 V nominal systems |
| Reset Timeout (tRP) | 140–400 ms - guarantees minimum reset pulse width for full microprocessor initialization and clock stabilization |
| Watchdog Timeout (tWD) | 1.12–3.20 s - provides configurable fault-detection window for software liveliness monitoring |
| Supply Current (ICC) | 6–17 µA (CAT824 M version) - enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| Operating Temp Range | −40°C to +85°C - supports industrial-grade reliability without derating in harsh ambient environments |
| Reset Output Type | CMOS push-pull active-low - drives standard logic inputs directly; sinks 3.2 mA at VOL ≤ 0.4 V |
| MR Pullup Resistance | 35–75 kΩ (internal) - eliminates need for external pull-up resistor when connecting mechanical pushbuttons |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), Pb-free, RoHS-compliant, 2.90 mm × 1.60 mm × 0.95 mm profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.2–5.5 V; powers internal reference, comparators, and logic; supplies RESET output stage |
| WDI | Watchdog timer input | Edge-triggered input; requires low-to-high or high-to-low transition every ≤3.20 s to prevent reset assertion |
| RESET | Active-low reset output | CMOS push-pull driver; 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 for noise immunity |
| MR | Manual reset input | Active-low input with internal 52 kΩ pull-up; debounced and timed to generate ≥140 ms RESET pulse on release |
Key Features
| Feature | Design Value |
|---|---|
| Accurate Brownout Detection | 4.38 V trip with ±125 mV tolerance and 40 ppm/°C tempco - ensures consistent reset behavior across temperature and supply variance |
| Integrated Watchdog Timer | Configurable 1.12–3.20 s timeout - detects firmware hangs without external timing components or MCU intervention |
| Direct Pushbutton Interface | Internal 52 kΩ MR pull-up - eliminates BOM cost and layout area for external resistor; supports momentary switch connection |
| Low-Power Supervision | 6 µA typical ICC - extends battery life in portable and always-on monitoring systems |
| Robust Output Drive | 3.2 mA sink capability at VOL ≤ 0.4 V - reliably drives standard CMOS/TTL reset inputs under worst-case VCC conditions |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
|
Use Scenario: Power cycling and firmware crash recovery in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: System supervisory IC providing power-on reset, brownout protection, and watchdog-triggered recovery. Use Value: Prevents undefined controller states during voltage sags or software lockups; ensures deterministic restart with ≥140 ms reset hold time. |
Use Scenario: Battery-powered portable ultrasound or glucose meter requiring guaranteed boot integrity and low-power supervision. IC Role / Device Role / Timing Role: Voltage monitor and reset generator with manual override for user-initiated recalibration or error clearance. Use Value: Enables safe, repeatable power-up sequencing and field-serviceable reset via physical button without MCU involvement. |
| Automotive Body Control Modules | Smart Energy Metering Gateways |
|
Use Scenario: Cold-cranking and load-dump resilience in 12 V automotive subsystems where VCC may dip below 4.38 V during engine start. IC Role / Device Role / Timing Role: Precision reset supervisor detecting sub-threshold VCC excursions and asserting RESET until stable 4.38 V is restored. Use Value: Avoids spurious microcontroller resets during transient dips while guaranteeing clean restart once supply recovers. |
Use Scenario: Tamper-resistant utility meter gateway that must survive grid fluctuations and maintain secure boot integrity. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for brownout and uses WDI to verify host processor liveness every 1.6 s. Use Value: Detects both power anomalies and firmware faults, triggering hardware reset before corrupted data transmission occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823MESA+ | Same 4.38 V reset threshold, identical TSOT-23-5 pinout, but higher ICC (25 µA typ) and no MR input | Lacks manual reset capability; suitable only where external reset initiation is unnecessary | Select when footprint compatibility is critical and MR functionality is unused |
| TPS3808G33DBVR | 3.3 V reset threshold, adjustable watchdog (1.25 ms–10 s), 1.6 µA ICC, SOT-23-6 package | Different threshold and pin count; requires PCB redesign but offers lower quiescent current and wider watchdog range | Select when lower power and programmable timeout outweigh pinout continuity needs |
Compared with CAT825MSDI-GT3, MAX823MESA+ offers drop-in replacement in footprint and threshold but omits MR; TPS3808G33DBVR provides superior power efficiency and flexibility at the cost of board-level redesign and threshold mismatch for 4.5 V systems.
Availability
CAT825MSDI-GT3 is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, automotive body electronics, and smart metering gateways requiring stable component supply and long-term lifecycle support.
Supply support for CAT825MSDI-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, and medical applications.
CAT825MSDI-GT3 belongs to the CAT82x family of supervisory ICs engineered specifically for robust, low-cost microprocessor reset and watchdog supervision in space-constrained, thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of the CAT825MSDI-GT3?
The CAT825MSDI-GT3 has a nominal reset threshold of 4.38 V, with a guaranteed range of 4.25 V to 4.50 V over the full operating temperature range of −40°C to +85°C. This value is factory-trimmed and specified in Table 3 of the official onsemi datasheet. The CAT825MSDI-GT3 uses an internal bandgap reference and comparator to assert RESET when VCC falls below this threshold, making it suitable for 4.5 V nominal systems requiring precise brownout detection.
Does the CAT825MSDI-GT3 include a manual reset input?
No - the CAT825MSDI-GT3 does not include a manual reset (MR) input. It is a variant of the CAT824 series (not CAT823), which omits MR functionality. The CAT825MSDI-GT3 provides only VCC monitoring, watchdog timer (WDI), and active-low RESET output. If manual reset capability is required, the CAT823 series (e.g., CAT823MTDI-GT3) should be selected instead. The CAT825MSDI-GT3 pinout contains VCC, WDI, RESET, GND, and RESET - confirming dual-reset-output, no-MR configuration.
What is the watchdog timeout range for the CAT825MSDI-GT3?
The CAT825MSDI-GT3 watchdog timeout (tWD) is specified from 1.12 s to 3.20 s, with a typical value of 1.60 s at 25°C. This timeout begins after RESET becomes inactive and resets on each valid edge (low-to-high or high-to-low) at the WDI pin. The CAT825MSDI-GT3 watchdog is fully functional and independent of VCC monitoring - it will trigger RESET even if VCC remains stable, provided WDI transitions are missed. This behavior is confirmed in the Functional Description section of the onsemi datasheet.
Is the CAT825MSDI-GT3 pin-compatible with MAX823/824 devices?
Yes - the CAT825MSDI-GT3 is pin- and function-compatible with the MAX823/824 family in TSOT-23-5 packaging, as explicitly stated in the "Features" section of the onsemi datasheet. Both share identical pin assignments: VCC, WDI, RESET, GND, and RESET. However, note that CAT825MSDI-GT3 corresponds to the CAT824 variant (dual RESET outputs, no MR), matching MAX824's functionality. This compatibility allows direct substitution in existing designs using MAX824MESA+ or equivalent, provided the 4.38 V threshold meets system requirements.
What package type and environmental compliance does the CAT825MSDI-GT3 use?
The CAT825MSDI-GT3 is packaged in a TSOT-23-5 (Case 419AE) surface-mount package measuring 2.90 mm × 1.60 mm × 0.95 mm. It is Pb-free, halogen-free/BFR-free, and RoHS-compliant, with NiPdAu lead finish. This package is optimized for high-density PCB layouts and automated assembly. The mechanical dimensions and JEDEC MO-193 compliance are documented on page 9 of the onsemi datasheet, and the part is shipped in 3,000-unit tape-and-reel format - consistent with industry-standard handling for TSOT-23 devices.
CAT825MSDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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)
CAT825MSDI-GT3 FAQ
1.How can I place an order for CAT825MSDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT825MSDI-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 CAT825MSDI-GT3 reliable?
The price and inventory of CAT825MSDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT825MSDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT825MSDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT825MSDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT825MSDI-GT3?
CAT825MSDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT825MSDI-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 CAT825MSDI-GT3?
For technical support, including CAT825MSDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT825MSDI-GT3 requirements.
6.How does Aetrix verify that CAT825MSDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT825MSDI-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 CAT825MSDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT825MSDI-GT3?
All CAT825MSDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT825MSDI-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 CAT825MSDI-GT3 part is unused and in its original packaging.
Return procedure for CAT825MSDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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