KA431DTF

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable precision shunt regulator - Low dynamic output impedance - Wide operating current range - High accuracy and stability - Low temperature coefficient - Fast response time

Package: TO-92, SOT-23, SOT-89

Essence: The KA431DTF is a three-terminal adjustable precision shunt regulator. It is designed to provide a stable reference voltage with high accuracy and low temperature coefficient.

Packaging/Quantity: Available in tape and reel packaging. Quantity per reel varies depending on the package type.

Specifications

• Reference Voltage Range: 2.5V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Coefficient: ±50ppm/°C
• Output Voltage Tolerance: ±0.4%
• Maximum Cathode Current: 150mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The KA431DTF has three pins:

1. Anode (A): Connected to the positive supply voltage.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Provides the stable reference voltage.

Functional Features

• Adjustable Output Voltage: The reference pin allows the user to set the desired output voltage by connecting external resistors.
• Overcurrent Protection: The KA431DTF includes built-in overcurrent protection, preventing excessive current flow through the device.
• Low Dynamic Output Impedance: Ensures stable voltage regulation even under varying load conditions.
• Fast Response Time: The device quickly responds to changes in load current, maintaining a stable output voltage.

Advantages and Disadvantages

Advantages: - High accuracy and stability - Wide operating current range - Low temperature coefficient - Easy to use and configure - Cost-effective solution for voltage regulation

Disadvantages: - Limited maximum cathode current (150mA) - Requires external resistors for adjustable output voltage

Working Principles

The KA431DTF operates as a shunt regulator, maintaining a stable reference voltage across the load. By adjusting the resistance connected to the reference pin, the output voltage can be set to the desired value. The device compares the reference voltage with the feedback voltage and adjusts the current flowing through the cathode accordingly, ensuring a constant output voltage.

Detailed Application Field Plans

The KA431DTF is widely used in various applications, including:

1. Voltage Regulation: It is commonly used as a precision voltage reference in power supplies, battery chargers, and voltage regulators.
2. Error Amplifiers: The device can be employed as an error amplifier in feedback control systems, providing accurate voltage comparison and adjustment.
3. Current Limiting: It can be utilized as a current limiter to protect sensitive components from excessive current flow.
4. Temperature Sensors: The KA431DTF can be integrated into temperature sensing circuits to provide precise temperature compensation.

Detailed and Complete Alternative Models

1. TL431: Similar three-terminal adjustable precision shunt regulator with comparable specifications and features.
2. LM4040: Precision voltage reference IC available in various voltage options.
3. LT1009: Precision reference IC with low temperature coefficient and high accuracy.

These alternative models offer similar functionality and can be considered as substitutes for the KA431DTF based on specific application requirements.

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