SP721ABTG Circuit Protection

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Mixed technology encompasses a wide range of technologies, from analog to digital, from the physical to the cyber world, and from design to assembly. SP721ABTG is one of the mixed technology products that is used to protect sensitive electronic devices from voltage fluctuations and transient events. SP721ABTG uses a unique combination of technologies to offer maximum protection against overvoltage, undervoltage, and electrostatic discharge (ESD) events.

The SP721ABTG’s application field includes industrial and consumer applications such as automotive, medical, security, computer, military and aerospace, commercial, telecommunications, and many others. The SP721ABTG is available in two circuit technologies; one utilizing a low voltage FET and another utilizing an Active Clamp FET arrangement. This device is designed for use in both low and high voltage applications. It offers a wide variety of protection ranging from surge, inrush, and ESD protection.

Working Principle: SP721ABTG works on the principle of switching transistors and passive components which make it suitable for a wide variety of applications. The device consists of two main parts; a clamp component, and a series device. The series device, also called a shunt device, is a fast-acting transistor with an intrinsic diode connected to its base-collector terminals. This diode provides protection against overvoltage. The clamp component, also called an active clamp FET (Field Effect Transistor), consists of two components; a clamp FET which is used to switch on and off the clamp voltage, and a zener diode which is used to limit the clamp voltage. The active clamp FET senses the voltage fluctuations and injects an appropriate amount of current to the device when an overvoltage occurs. The clamp device then protects the device from both overvoltage and undervoltage.

The SP721ABTG is capable of providing both ESD protection and surge protection in the same package. The ESD protection is provided through zener diodes connected to the drain of the clamp FET. These zener diodes provide protection against ESD by clamping the voltage at the drain of the FET. The surge protection is provided by the series device, which allows for fast switching and low impedance. The series device is triggered when the voltage reaches a certain level, and it is designed to absorb the energy of the transient event.

SP721ABTG also utilizes thermal and latching functions for effective protection against ESD, surge, and inrush. The thermal protection is provided through the use of thermistors, which are connected to the drain of the FET. The thermistor works by detecting the temperature and triggering a warning signal when the temperature exceeds a certain point. The latching protection is provided by a latching relay that is connected to the series device. When an overvoltage or undervoltage event occurs the latching relay triggers and provides protection against the transient event.

The SP721ABTG is a versatile product that provides protection from both overvoltage and undervoltage, transient events, and ESD. It is suitable for a wide variety of applications and is available in two technologies. The unique combination of devices found in the SP721ABTG provides superior protection and performance.

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