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onsemi CAT812TTBI-T3
- Part No.:
- CAT812TTBI-T3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
CAT812TTBI-T3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
CAT812TTBI-T3 from ON Semiconductor is a 4-pin SOT-143 microprocessor power supply supervisor with active HIGH reset output, 3.08 V ±5% threshold, 140–400 ms reset timeout, and manual reset input. It monitors +3.3 V systems in industrial embedded control, cable modems, and intelligent instrumentation where reliable brownout detection and glitch-immune reset assertion are required.
For engineers reviewing the CAT812TTBI-T3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SOT-143 terminal mapping, confirmed industrial temperature operation (−40°C to +85°C), and real-world alternative part comparisons for power-supply monitoring designs.
Technical Context
The CAT812TTBI-T3 implements a precision voltage reference and comparator-based reset generator with digital delay logic, asserting RESET high when VCC falls below 3.08 V and maintaining it for ≥140 ms after VCC recovers. Its AE2™ floating-gate technology enables stable threshold accuracy across temperature (30 ppm/°C tempco) and ensures valid reset state down to VCC = 1.0 V.
It features a push-pull RESET output capable of sourcing 150 µA at 0.8×VCC (for VCC > 1.8 V) and sinking 1.2 mA with VOL ≤ 0.3 V, plus a manual reset input (MR̄) with 20 kΩ internal pull-up, 10 µs minimum pulse width, and 100 ns glitch immunity - all in a 4-pin SOT-143 package rated for industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±5% - precisely matches +3.3 V rail monitoring with guaranteed trip range 3.00–3.15 V over −40°C to +85°C |
| Reset Timeout Period | 140–400 ms - ensures microprocessor reset hold time exceeds boot initialization requirements across full temperature range |
| Supply Current | 6–15 µA - ultra-low ICC enables use in battery-backed or energy-constrained systems without significant load impact |
| VCC Operating Range | 1.2–5.5 V - supports operation during brownout recovery and compatibility with 2.5 V, 3.0 V, 3.3 V, and 5.0 V supplies |
| Reset Output Type | Push-pull active HIGH - eliminates need for external pull-up resistor and provides robust drive into MCU reset pins |
| Manual Reset Input | MR̄ with 20 kΩ internal pull-up - simplifies board layout by removing external biasing; logic LOW asserts RESET for ≥140 ms after release |
| Power Supply Immunity | Rejects transients ≤100 mV amplitude and ≤4 µs duration - prevents false resets from switching noise or ESD-induced supply dips |
Pinout & Package
Package: SOT-143 (4-pin, JEDEC TO-253 compliant), dimensions 2.90 × 2.64 × 1.07 mm, NiPdAu lead finish, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal voltage reference and comparator; must be connected to system ground plane for accurate threshold sensing |
| 2 | RESET | Active HIGH push-pull reset output; drives high to assert reset on connected microprocessor; sinks 1.2 mA with VOL ≤ 0.3 V |
| 3 | MR̄ | Manual reset input; active LOW with internal 20 kΩ pull-up; requires <0.25×VCC to assert reset; 10 µs minimum pulse width |
| 4 | VCC | Monitored power supply input; also powers internal circuitry; valid reset assertion guaranteed down to 1.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | Enables accurate supervision of +3.3 V rails with ±5% tolerance over full industrial temperature range (−40°C to +85°C) |
| 140 ms minimum reset timeout | Guarantees sufficient reset hold time for microcontrollers requiring ≥100 ms power-on reset, even under worst-case temperature and voltage conditions |
| 6 µA typical supply current | Minimizes quiescent load on backup batteries or low-power auxiliary rails in always-on monitoring applications |
| MR̄ with integrated 20 kΩ pull-up | Reduces BOM count and PCB area by eliminating external pull-up resistor while ensuring defined default state when MR̄ is unconnected |
| VCC transient immunity | Rejects fast supply glitches ≤4 µs and ≤100 mV amplitude - critical for noise-prone switch-mode power supply environments |
Applications
| Cable Modem Power Monitoring | Industrial PLC Controller Supervision |
|---|---|
Use Scenario: Monitors the main 3.3 V supply in DOCSIS-compliant cable modems during cold start and line-voltage sags. IC Role / Device Role / Timing Role: CAT812TTBI-T3 acts as primary power-on reset generator and brownout detector, asserting active HIGH RESET to halt CPU execution until stable 3.3 V is confirmed. Use Value: Prevents firmware corruption during unstable power-up by enforcing ≥140 ms reset hold, directly aligned with Broadcom BCM3380 boot timing requirements. | Use Scenario: Embedded in programmable logic controller I/O modules operating in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: CAT812TTBI-T3 supervises the isolated 3.3 V logic rail and interfaces with manual reset button via MR̄ to support field-service recovery without power cycle. Use Value: Ensures deterministic reset behavior across −40°C to +85°C using 30 ppm/°C tempco and guarantees valid RESET state down to VCC = 1.0 V during brownout recovery. |
| Smart Energy Meter Voltage Monitoring | Wireless Base Station Control Card |
Use Scenario: Integrated into Class 0.5 smart electricity meters where long-term reliability and low power consumption are mandated by IEC 62053. IC Role / Device Role / Timing Role: CAT812TTBI-T3 continuously monitors the 3.3 V microcontroller supply and triggers reset on undervoltage events caused by transformer tap changes or grid instability. Use Value: Delivers 6–15 µA ICC across temperature, enabling >10-year battery-backed operation in tamper-detection circuits without compromising reset accuracy. | Use Scenario: Used on LTE base station control cards where RF interference induces supply transients on 3.3 V FPGA configuration rails. IC Role / Device Role / Timing Role: CAT812TTBI-T3 provides glitch-immune reset generation with 100 ns transient rejection, preventing spurious reboots during high-power RF transmission bursts. Use Value: Eliminates need for external RC filtering on VCC due to built-in 4 µs transient immunity, reducing component count and board space in dense RF layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812TUT+T | Same 3.08 V threshold, active HIGH reset, SOT-143 package, but higher ICC (15–25 µA) and no MR̄ input | Lacks manual reset capability - unsuitable for systems requiring field-service reset buttons or watchdog-triggered recovery | Select only if MR̄ is unused and lower supply current is not critical; verify reset timeout (140 ms min) matches design timing margin |
| TPS3808G33DBVR | 3.3 V threshold, active HIGH, SOT-23-6 package, 1.5 µA ICC, but requires external capacitor for adjustable timeout (default 200 ms) | Requires external timing capacitor and occupies larger footprint; offers tighter threshold accuracy (±0.5%) but no integrated MR̄ pull-up | Prefer for ultra-low-power designs where board space allows SOT-23-6 and external capacitor; avoid if MR̄ integration or SOT-143 footprint is mandatory |
Compared with MAX812TUT+T and TPS3808G33DBVR, CAT812TTBI-T3 uniquely combines SOT-143 compactness, integrated MR̄ pull-up, 6 µA ICC, and guaranteed 140 ms reset timeout - making it optimal for space-constrained industrial controllers needing field-service reset capability.
Availability
CAT812TTBI-T3 is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, cable modems, and wireless base station control cards requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for CAT812TTBI-T3 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The CAT812TTBI-T3 belongs to ON Semiconductor's legacy microprocessor supervisor product line, designed specifically for reliable, low-power, single-rail voltage monitoring in industrial and communications equipment operating across −40°C to +85°C.
FAQ
What is the exact reset threshold voltage of CAT812TTBI-T3 and how is it specified over temperature?
The CAT812TTBI-T3 has a nominal reset threshold of 3.08 V with ±5% tolerance over the industrial temperature range (−40°C to +85°C), corresponding to a guaranteed trip range of 3.00 V to 3.15 V. This is explicitly defined in the Electrical Operating Characteristics table of the MD-3005 Rev. T datasheet, and the device exhibits a 30 ppm/°C tempco to maintain stability across its full operating range. The CAT812TTBI-T3 uses AE2™ floating-gate technology to achieve this precision without external calibration.
Does CAT812TTBI-T3 support manual reset functionality, and what are the electrical requirements for the MR̄ pin?
Yes, CAT812TTBI-T3 includes a manual reset input (MR̄) on Pin 3 that asserts the active HIGH RESET signal when pulled LOW. The MR̄ pin features an internal 20 kΩ pull-up resistor, requires a logic LOW of <0.25×VCC to activate, and accepts minimum pulse widths of 10 µs. Glitches ≤100 ns are rejected, and RESET remains asserted for ≥140 ms after MR̄ returns HIGH. These specifications are confirmed in the PIN DESCRIPTION and ELECTRICAL OPERATING CHARACTERISTICS sections of the CAT812TTBI-T3 datasheet.
What is the minimum VCC voltage at which CAT812TTBI-T3 guarantees valid RESET output state?
The CAT812TTBI-T3 guarantees valid RESET output state down to VCC = 1.0 V, as stated in both the FEATURES and DETAILED DESCRIPTION sections of the MD-3005 Rev. T datasheet. Below 1.0 V, a pull-up resistor from RESET to VCC is recommended to ensure defined logic level. This capability enables reliable reset assertion during deep brownout conditions and supports safe shutdown sequencing in systems with multi-rail power architectures.
How does CAT812TTBI-T3 handle fast power supply transients, and what is its immunity specification?
CAT812TTBI-T3 rejects fast power supply transients ≤4 µs in duration and ≤100 mV in amplitude, as documented in the DETAILED DESCRIPTION and TYPICAL OPERATING CHARACTERISTICS sections. Its internal comparator architecture and digital delay logic prevent false resets from switching noise or ESD-induced dips. The maximum transient duration without causing reset decreases as the overdrive (VTH − VCC) increases - a behavior characterized in Figure 2 of the datasheet and validated across temperature.
Is CAT812TTBI-T3 pin-compatible with MAX812, and what are the key functional similarities?
Yes, CAT812TTBI-T3 is a direct replacement for MAX812 in industrial-temperature applications, as explicitly stated in the FEATURES and DESCRIPTION sections of the datasheet. Both devices share identical SOT-143 pinout, 3.08 V threshold, active HIGH reset output, manual reset input, 140 ms minimum timeout, and −40°C to +85°C operation. No PCB changes are required when substituting CAT812TTBI-T3 for MAX812 in existing designs meeting these constraints.
CAT812TTBI-T3 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:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
CAT812TTBI-T3 FAQ
1.How can I place an order for CAT812TTBI-T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT812TTBI-T3 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 CAT812TTBI-T3 reliable?
The price and inventory of CAT812TTBI-T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT812TTBI-T3 is usually 5 days.
3.What payment methods are accepted for CAT812TTBI-T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT812TTBI-T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT812TTBI-T3?
CAT812TTBI-T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT812TTBI-T3 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 CAT812TTBI-T3?
For technical support, including CAT812TTBI-T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT812TTBI-T3 requirements.
6.How does Aetrix verify that CAT812TTBI-T3 is sourced from the original manufacturer or authorized distributors?
All CAT812TTBI-T3 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 CAT812TTBI-T3 meets industry standards.
7.What is the process for return or replacement of CAT812TTBI-T3?
All CAT812TTBI-T3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT812TTBI-T3, 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 CAT812TTBI-T3 part is unused and in its original packaging.
Return procedure for CAT812TTBI-T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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