The KIA431B is a three-terminal adjustable shunt regulator offering excellent temperature stability and voltage accuracy. It functions effectively as a zener diode with a programmable voltage reference. This device is commonly utilized in voltage regulation, current limiting, and over-voltage protection circuits. The KIA431B provides flexibility in designing custom voltage references and offers a cost-effective alternative to fixed voltage regulators in many applications.

Applications

• Power supplies: Used as a voltage reference in linear and switching power supplies.
• Voltage monitoring: Employed in circuits to monitor voltage levels and trigger protective actions.
• Current limiting: Integrated into circuits to limit current flow and prevent damage from over-current conditions.
• Over-voltage protection: Used to protect circuits from excessive voltage by shunting current to ground.
• Instrumentation: Incorporated into precision measurement circuits as a stable voltage reference.

Features

• Programmable output voltage: Adjustable output voltage via two external resistors.
• Low temperature coefficient: Stable output voltage over a wide temperature range.
• Low dynamic output impedance: Provides excellent load regulation.
• Wide operating current range: Operates with a wide range of cathode currents.
• Tight tolerance: Available with different initial voltage tolerance options.

Benefits

• Flexibility in design: Allows for custom voltage reference configurations.
• Stable performance: Provides reliable voltage regulation over temperature variations.
• Improved load regulation: Maintains stable output voltage under varying load conditions.
• Cost-effective solution: Offers a cheaper alternative to fixed voltage regulators.
• Simplified circuit design: Requires minimal external components.

Additional Details

The KIA431B has a typical thermal resistance of 160 °C/W. It's available in several packages like TO-92, SOT-23, and others. The reference voltage is typically around 2.5V. The KIA431B can operate with cathode voltages ranging from Vref to 36V, and its operating current ranges from 1mA to 100mA. The device is widely used due to its versatility and ease of implementation in various electronic circuits.