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onsemi CAT811RTBI-GT3
- Part No.:
- CAT811RTBI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
CAT811RTBI-GT3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,612
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Product details
Overview
CAT811RTBI-GT3 from onsemi is a 4-pin SOT-143 microprocessor power supply supervisor with manual reset input, 2.63 V ±5% reset threshold, active LOW push-pull RESET output, and guaranteed reset assertion down to VCC = 1.0 V - used in embedded control systems to ensure reliable power-on initialization and brownout recovery.
For engineers reviewing the CAT811RTBI-GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include reset threshold accuracy (2.63 V), industrial temperature range (−40°C to +85°C), MR input timing (10 µs minimum pulse width), and SOT-143 package compatibility with space-constrained PCB layouts.
Technical Context
The CAT811RTBI-GT3 implements a precision bandgap voltage reference and comparator-based monitoring architecture with digital delay logic to enforce a minimum 140 ms reset timeout after VCC rises above the 2.63 V threshold. Its floating-gate Analog EEPROM enables factory-trimmed threshold calibration.
It features an internal 20 kΩ pull-up on the MR pin, guarantees RESET validity at VCC ≥ 1.0 V, and rejects transients ≤100 ns - enabling robust operation in noisy industrial power rails without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±5% - precisely matches 2.5 V system rails with margin for tolerance drift over temperature. |
| Reset Timeout Period | 140–400 ms - ensures sufficient hold time for CPU core and peripheral initialization before release. |
| Supply Current | 6 µA typical - enables ultra-low-power operation in battery-backed or energy-harvesting systems. |
| VCC Operating Range | 1.2 V to 5.5 V (−40°C to +85°C) - supports wide-input LDO outputs and multi-rail supervision. |
| MR Input Pulse Width | ≥10 µs - accommodates standard GPIO-driven manual reset signals without debouncing circuitry. |
| RESET Output Type | Push-pull active LOW - drives directly into microcontroller reset pins without external pull-up resistor. |
| Reset Tempco | 30 ppm/°C - limits threshold drift to <±15 mV across full industrial temperature range. |
Pinout & Package
Package: SOT-143 (Case 527AF), 2.90 mm × 1.30 mm × 0.90 mm, Pb-free with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal bias and RESET output sink current; must be low-impedance connection to system ground plane. |
| RESET (Pin 2) | Active LOW reset output | Push-pull driver asserts LOW when VCC < 2.63 V or MR is LOW; remains LOW for ≥140 ms after recovery. |
| MR (Pin 3) | Manual reset input | Active LOW input with internal 20 kΩ pull-up; initiates reset on falling edge and holds for 140 ms after rising edge. |
| VCC (Pin 4) | Monitored supply input | Primary power rail under supervision; powers internal circuitry and determines RESET state via comparator threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | Factory-trimmed using floating-gate Analog EEPROM - eliminates need for external resistor dividers or calibration. |
| Reset valid down to VCC = 1.0 V | Ensures known RESET state during deep brownout or partial power loss - critical for fail-safe shutdown sequencing. |
| 100 ns transient immunity | Rejects short-duration supply glitches without false triggering - avoids spurious resets in electrically noisy environments. |
| Industrial temperature range | Guaranteed operation from −40°C to +85°C - suitable for uncontrolled ambient deployments in industrial gateways and metering hardware. |
| SOT-143 compact footprint | Enables placement near microcontroller reset pins with minimal trace length - reduces noise coupling and layout complexity. |
Applications
| Industrial PLC I/O Modules | Smart Energy Meters |
|---|---|
Use Scenario: Power cycling during firmware updates or communication link recovery in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supervises 3.3 V logic rail and asserts synchronized reset to ARM Cortex-M microcontroller and isolated RS-485 transceivers. Use Value: Prevents partial initialization states by enforcing ≥140 ms reset hold time - eliminating lockup after undervoltage events on shared DC bus. | Use Scenario: Cold-start and grid voltage sag detection in Class 0.5S electricity meters with metrology SoCs. IC Role / Device Role / Timing Role: Monitors 2.5 V analog front-end supply and triggers hard reset when VCC drops below 2.63 V threshold during brownout. Use Value: Maintains data integrity in flash memory by ensuring MCU reset occurs before ADC sampling resumes - avoiding corrupted calibration registers. |
| Wireless Sensor Gateways | White Goods Control Boards |
Use Scenario: Battery backup switchover and low-power wake-up in LoRaWAN edge gateways with dual-supply architectures. IC Role / Device Role / Timing Role: Supervises 2.5 V LDO output powering RF SoC and asserts RESET if battery voltage sags below 2.63 V during load surge. Use Value: Enables deterministic restart without watchdog timeout race conditions - critical for maintaining network join state across power transitions. | Use Scenario: Power sequencing during compressor startup in inverter-driven refrigerators with multi-voltage control boards. IC Role / Device Role / Timing Role: Monitors 3.3 V MCU supply and provides manual reset via front-panel button connected to MR pin. Use Value: Guarantees clean reset initiation independent of main AC line stability - preventing erratic behavior during motor inrush-induced dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TRD3+T | Same 2.63 V threshold, but specified only to +70°C; higher 20 µA supply current; SC70-4 package (2.0 × 1.25 mm). | Limited to commercial-temperature applications; smaller footprint but less thermal margin in enclosed enclosures. | Select when operating ambient stays below 70°C and board area is constrained beyond SOT-143 dimensions. |
| TPS3808G12DBVR | Adjustable threshold (via external resistor); 36 µA typical ICC; wider 0.9–6.0 V VCC range; SOT-23-5 package. | Requires external resistor network; supports programmable thresholds but adds BOM cost and layout area. | Select when system requires field-configurable reset voltage or operates outside 1.2–5.5 V range of CAT811RTBI-GT3. |
Compared with MAX811TRD3+T and TPS3808G12DBVR, the CAT811RTBI-GT3 delivers guaranteed industrial-temperature operation, lowest quiescent current (6 µA), and fixed 2.63 V threshold in a proven SOT-143 package - simplifying design validation for 2.5 V system supervision without external components.
Availability
CAT811RTBI-GT3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, and wireless sensor gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CAT811RTBI-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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The CAT811RTBI-GT3 belongs to onsemi's supervisory IC product line, engineered specifically for reliable power-on reset and brownout protection in space- and power-constrained embedded systems operating across harsh industrial environments.
FAQ
What is the exact reset threshold voltage of the CAT811RTBI-GT3?
The CAT811RTBI-GT3 has a nominal reset threshold voltage of 2.63 V with ±5% tolerance over the industrial temperature range (−40°C to +85°C). This value is factory-trimmed using onsemi's floating-gate Analog EEPROM technology and is confirmed in Table 4 of the official datasheet. The threshold remains stable with a tempco of 30 ppm/°C, resulting in less than ±15 mV drift across the full operating range - making it suitable for precise supervision of 2.5 V system rails.
Does the CAT811RTBI-GT3 support manual reset functionality?
Yes, the CAT811RTBI-GT3 includes a dedicated Manual Reset (MR) input on Pin 3. A logic LOW on MR asserts the active LOW RESET output for the duration of the LOW signal plus a guaranteed 140 ms timeout after MR returns HIGH. The MR pin features an internal 20 kΩ pull-up resistor, so it may be left open when unused. Minimum MR pulse width is 10 µs, compatible with standard microcontroller GPIO outputs.
What is the operating voltage range for the CAT811RTBI-GT3?
The CAT811RTBI-GT3 operates over a VCC range of 1.2 V to 5.5 V when specified across the industrial temperature range (−40°C to +85°C). At room temperature, the device functions down to 1.0 V, and its RESET output remains valid and well-defined even at VCC = 1.0 V - a key feature for brownout detection and controlled shutdown sequencing in low-voltage systems.
Is the CAT811RTBI-GT3 pin-compatible with other CAT811 variants?
Yes, all CAT811 variants including CAT811RTBI-GT3 share identical pinout (GND, RESET, MR, VCC) and SOT-143 package (Case 527AF). The only functional difference between variants is the factory-programmed reset threshold voltage (e.g., 2.63 V for CAT811RTBI-GT3 vs. 3.08 V for CAT811TTBI-GT3). No PCB layout changes are required when substituting within the CAT811 family for threshold adjustment.
What package type and environmental compliance does the CAT811RTBI-GT3 have?
The CAT811RTBI-GT3 is packaged in a Pb-free SOT-143 (Case 527AF) with NiPdAu lead finish, measuring 2.90 mm × 1.30 mm × 0.90 mm. It is RoHS compliant, halogen-free, and BFR-free per onsemi's manufacturing standards. The device meets JEDEC moisture sensitivity level (MSL) 1 and supports lead-free reflow soldering up to +300°C for 10 seconds.
CAT811RTBI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
CAT811RTBI-GT3 FAQ
1.How can I place an order for CAT811RTBI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT811RTBI-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 CAT811RTBI-GT3 reliable?
The price and inventory of CAT811RTBI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT811RTBI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT811RTBI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT811RTBI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT811RTBI-GT3?
CAT811RTBI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT811RTBI-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 CAT811RTBI-GT3?
For technical support, including CAT811RTBI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT811RTBI-GT3 requirements.
6.How does Aetrix verify that CAT811RTBI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT811RTBI-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 CAT811RTBI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT811RTBI-GT3?
All CAT811RTBI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT811RTBI-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 CAT811RTBI-GT3 part is unused and in its original packaging.
Return procedure for CAT811RTBI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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