SA85A-E3/54 Circuit Protection

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A transient voltage suppressor (TVS) is a type of diode that is typically used to protect electrical equipment from unexpected voltage surges from external sources, such as lightning. The SA85A-E3/54 is a bidirectional TVS diode that is specifically designed for EFT (Electrical Fast Transient) type surges, and provides superior protection from damaging electrical transients. The following article will discuss the application field of the SA85A-E3/54, as well as its working principle.

Application Field

The SA85A-E3/54 is a bidirectional TVS diode that is specifically designed for EFT (Electrical Fast Transient) type surges, and provides superior protection to I/O lines, as well as other equipment, from damaging electrical transients. The device features a wide operating temperature range of -55°C to +150°C, and has an ultra-low capacitance and high ESD tolerance, making it ideal for high-speed data lines. It is also resistant to overvoltage and short circuits, and is designed to handle EFT voltages up to 50V on its data pins. This makes it an ideal device for protecting communication interfaces, such as Ethernet, USB 2.0 and 3.0, HDMI, DVI, and others. It can also be used to protect power supply lines in industrial equipment, automotive electronics, and more.

Working Principle

The working principle of the SA85A-E3/54 is quite simple. The device features two pairs of dual diodes connected in a back-to-back configuration, separated by a thin layer of insulation. When a transient voltage pulse occurs, the capacitance of the device is initially discharged, and the voltage across the diode pair rises. This in turn bridges the gap between the diodes and provides a high surge energy reduction. The energy is then dissipated as heat in the form of Joule heating, and the excess voltage is cleared from the device. The device is designed so that any voltage greater than the rated peak pulse current is quickly redirected away from the sensitive components of the system, thus protecting them from any potential damage.

To ensure maximum protection, the design of the SA85A-E3/54 includes an internal ESD (electrostatic discharge) protection diode. This diode is connected in series with the two main diodes and helps to further reduce any incoming transient voltages. The device is also designed with an internal limiting resistor and a capacitance for additional protection against ESD events.

Conclusion

The SA85A-E3/54 is a bidirectional TVS diode that is specifically designed for EFT (Electrical Fast Transient) type surges, and provides superior protection from damaging electrical transients. It is ideal for protecting communication interfaces, as well as power supply lines in industrial equipment, automotive electronics, and more. Its working principle is simple: the device features two pairs of dual diodes connected in a back-to-back configuration, separated by a thin layer of insulation. When a transient voltage pulse occurs, the capacitance of the device is initially discharged, and the excess voltage is quickly redirected away from the sensitive components of the system. Together with its wide operating temperature range and ultra-low capacitance, the SA85A-E3/54 is a great choice for designers looking to safeguard their systems and equipment against damaging electrical transients.

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