SMBG78AHE3/5B Circuit Protection

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Transient Voltage Suppressors (TVS) are widely used in various applications for protection against transient voltages or surges. They are designed to clamp transient voltage or provide an alternate path to divert damaging current away from sensitive circuitry. TVS diodes, also known as Transient Voltage Suppressor Diodes, are silicon avalanche diodes that protect against transients by acting like a two-terminal surge absorber. They are typically more rugged than varistors and feature faster response times. One such device is the SMBG78AHE3/5B.

The SMBG78AHE3/5B is a 5.0 Volt, unidirectional, low capacitance Silicone Avalanche Diode designed for transient voltage protection. It is designed to protect electronic systems and circuits from voltage transients caused by Electrostatic Discharges (ESD), electrical overstress (EOS), and induced lightning. The SMBG78AHE3/5B provides superior protection, low capacitance, and fast response time, making it ideal for applications that require transient voltage protection.

The device has a wide range of applications where voltage and current transients need to be clamped. It can be used as an ESD protection, EOS protection, reverse EMI protection, and in power line/signal line protection circuits. It can also be used to replace voltage-zener diodes in applications where a low forward voltage is important.

The operating principle behind the SMBG78AHE3/5B is that of a two-terminal avalanche diode. When the transient voltage rises above the breakdown voltage of the diode, it triggers an avalanche breakdown that creates a path for the current and clamps the voltage. The current is diverted away from the protected device, limiting or eliminating the amount of damage. The device has a reverse stand-off voltage of 5.0 Volts and a maximum peak pulse current of 25A. This ensures that the device can protect circuits from all types of transient voltage conditions.

The SMBG78AHE3/5B is available in a surface mount SOD-323F package. This makes it ideal for applications where space and weight are at a premium. The SMBG78AHE3/5B is compatible with standard surface mount processes and is RoHS compliant.

In conclusion, the SMBG78AHE3/5B is an ideal choice for applications that require fast response times and superior protection from transient voltages. The device provides low capacitance and fast response times, making it the ideal choice for ESD, EOS, and other signal and power line protection applications. The SMBG78AHE3/5B is available in an SOD-323F surface mount package, making it suitable for applications where space and weight are at a premium.

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