1N4739A-T50A Discrete Semiconductor Products

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The 1N4739A-T50A is a small signal, single zener diode with a breakdown voltage of 5V and a maximum power rating of 500mW. It is classed as a Medium-Motorola voltage regulator diode and is designed to provide reliable, stable voltage regulation for a range of medium-power applications.

A typical application for a 1N4739A-T50A diode involves a voltage regulator circuit such as a power supply. Voltage regulators often encounter sudden drops in input voltage due to external influences, such as dropouts from the power source, short circuits, or thermal variations of components. In such cases the 1N4739A-T50A can help maintain a consistent output voltage. In these types of applications, the 1N4739A-T50A is used in conjunction with other components, such as transistors, capacitors, and resistors. To function as a voltage regulator, these components interact in a complicated way, allowing the diode to make up the difference between the input and the output voltages.

Working Principle

A zener diode is a modified form of a standard diode, which has a much lower “forward” voltage drop than a normal diode. This low forward voltage drop allows the diode to survive being reverse-biased to a voltage level beyond its rated breakdown voltage. When the reverse bias reaches the breakdown voltage level, the diode will start to conduct current.

The 1N4739A-T50A is designed to operate with a static breakdown voltage of 5V, meaning that the voltage across it will be limited to 5V, regardless of the amount of load on it. This can be useful in situations where there is a risk of overvoltage, as the diode will act as a limiting element and prevent the voltage from reaching dangerous levels. This protects the surrounding components from damage and reduces the cost of maintenance and repairs.

Application Field

1N4739A-T50A diodes are commonly used in small- to medium-power applications. The low forward voltage drop of the diode makes it suitable for use in logic-level circuitry, where accuracy and stability are important. Additionally, the diode can be used in power supplies to limit the output voltage to ensure reliable operation. The diode is also used as a shunt in circuits to measure current passing through them, as the current passing through the diode generates a voltage drop which can be measured.

1N4739A-T50A diodes are also suitable for use in many automotive applications, such as brake systems and airbags. The diode can be used to control the flow of current in these systems and ensure proper operation in the event of a malfunction. Additionally, the diode is used in electric vehicles to reduce resistance and protect components from overvoltage, reducing the risk of fire or electric shock.

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