MAP5KE20CA

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Transient Voltage Suppressor diodes, more commonly referred to as TVS diodes, are an important component for providing protection to sensitive devices or systems from exposure to voltage transients. Of the various types of TVS diodes available today, the MAP5KE20CA is one of the most commonly used. This article will provide an overview of the MAP5KE20CA’s application field and working principle.

Applications of MAP5KE20CA

The MAP5KE20CA is a 5kW unidirectional transient voltage suppressor diode and is designed for applications where short-term high-energy pulsing is expected. It is typically used for applications such as preventing damage from electrostatic discharge (ESD), motor-contact protection, and similar high-energy pulsing scenarios. It is often used in consumer electronics, communications, computers, and industrial and automotive fields to protect sensitive equipment from power surges or spikes.

The MAP5KE20CA is typically rated for powers up to 5 kW and voltages up to 20 V. Its peak reverse power dissipation voltage (VRWM) typically ranges from 5.2 V to 13.2 V. It is constructed of a glassy ceramic body encased in a plastic epoxy case. It is designed for surface mount and has an operating temperature range from -55°C to +175°C.

Working Principle

The MAP5KE20CA is designed to take advantage of the Zener breakdown mechanism. In an N-type semiconductor, electrons are injected into the depletion region via an applied voltage (VZ). When Vi is large enough, the concentration of electrons and holes is high enough to create free electron-hole pairs in the region. The electric field in the region then accelerates the electron and holes from their origin to the edge of the depletion region. When they reach the depletion region, they are attracted to the reversed P-N junction, and are ultimately collected by the P-type material. This is known as Zener breakdown and is a mechanism used by transient voltage suppressor diodes like the MAP5KE20CA.

When a transient voltage surge is present, the MAP5KE20CA conducts until the surge has dissipated. This is because the diode acts as a potential-limiting resistor. The circuit design works such that when a voltage surge is present, the voltage across the MAP5KE20CA rises until it reaches the Zener voltage at which point it begins to conduct. The diode has the ability to remain in this low-voltage state until the offending surge passes, at which point the voltage drops back to normal levels.

Conclusion

The MAP5KE20CA is an important component for protecting sensitive equipment from exposure to transient voltage surges. It utilizes a Zener breakdown mechanism to provide protection from high-energy pulsing applications such as electrostatic discharge, motor contact protection, and other similar applications. Its ability to stay in a low voltage state until after the offending surge passes makes it an attractive solution for a variety of applications in the consumer electronics, communications, computer, industrial, and automotive fields.

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