SMDJ28 Circuit Protection

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Transient Voltage Suppression (TVS) diodes are an integral part of many electronic systems and are commonly used in products such as computers, cell phones, communications equipment, and consumer electronics. The purpose of these devices is to protect the circuitry by diverting and dissipating surges in voltage. The SMDJ28 is a popular TVS diode used in these applications. This article will discuss the application field and working principle of the SMDJ28.

The SMDJ28 is a unidirectional, low capacitance diode with a three-terminal design, and is designed to protect against electrostatic discharge (ESD) and other overvoltage transients. It is suitable for use in both AC and DC applications, and is rated to provide circuit protection up to 28 volts. It is commonly used in situations where smaller capacitance diodes may not provide the necessary level of protection.

The application field of the SMDJ28 is quite broad, and it is commonly used in various consumer electronics. It is suitable for a range of applications, including: ESD protection, input protection, output buffer protection, device and system protection, voltage supervisor circuits, and overvoltage protection. Additionally, the device is sometimes employed to limit the input voltage of certain circuits, and can be used as an overvoltage reset switch.

The working principle of the SMDJ28 is based on the movement of free charges and the flow of current. When the voltage exceeds the breakdown voltage of the device, the free charges are attracted to the positive terminal of the diode, causing the diode to become forward biased. This initiates a current flow, which causes the voltage to drop, thereby protecting the circuit from excessive voltage. Once the voltage is reduced to a safe level, the diode returns to its off state and the circuit is again protected.

The SMDJ28 is a popular TVS diode due to its low capacitance rating and its wide range of applications. It is an effective way of protecting circuits from electrostatic discharge and other voltage transients. Understanding its application field and working principle can help to ensure the proper use of this diode in various electronic systems.

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