MCP121T-195I/LB

Product Overview

Category

The MCP121T-195I/LB belongs to the category of voltage supervisors.

Use

It is primarily used for monitoring and controlling the voltage levels in electronic circuits.

Characteristics

• Voltage Range: 1.95V
• Package Type: SOT-23
• Essence: Supervises voltage levels and provides reset signals.
• Packaging/Quantity: Available in tape and reel packaging with a quantity of 3000 units per reel.

Specifications

The MCP121T-195I/LB has the following specifications:

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage: 1.95V
• Reset Timeout Period: 140ms (typical)
• Quiescent Current: 5µA (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MCP121T-195I/LB has three pins:

1. VDD: Connects to the positive supply voltage.
2. GND: Connects to the ground or negative supply voltage.
3. RESET: Output pin that provides a reset signal when the voltage falls below the threshold.

Functional Features

The MCP121T-195I/LB offers the following functional features:

• Voltage Monitoring: Monitors the input voltage and generates a reset signal when it falls below the threshold.
• Reset Signal: Provides a stable reset signal to the microcontroller or other devices.
• Power-On Reset: Ensures proper initialization of the system during power-up.

Advantages and Disadvantages

Advantages

• Wide operating voltage range allows compatibility with various systems.
• Low quiescent current minimizes power consumption.
• Small package size enables space-saving designs.

Disadvantages

• Fixed reset threshold voltage may not be suitable for all applications.
• Limited timeout period may not be sufficient for certain system requirements.

Working Principles

The MCP121T-195I/LB operates based on a voltage comparator circuit. It continuously monitors the input voltage and compares it with the preset threshold voltage. When the input voltage falls below the threshold, the reset output is activated, providing a signal to reset the connected devices. The device remains in this state until the input voltage rises above the threshold again.

Detailed Application Field Plans

The MCP121T-195I/LB finds applications in various fields, including:

1. Power Supply Monitoring: Ensuring stable operation of power supplies by monitoring voltage levels and generating reset signals when necessary.
2. Microcontroller Systems: Providing reliable reset signals to microcontrollers during power-up or voltage fluctuations.
3. Battery-Powered Devices: Preventing damage to sensitive electronics by monitoring battery voltage and initiating appropriate actions.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the MCP121T-195I/LB include:

1. MAX809: Voltage Supervisors with Adjustable Reset Thresholds.
2. TPS3839: Ultra-Low Quiescent Current Voltage Supervisors.
3. ADM6315: Microprocessor Supervisory Circuits with Manual Reset Input.

These alternatives provide flexibility in terms of reset thresholds, quiescent current, and package options, catering to different application requirements.

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