SMCJ78AHE3/57T Circuit Protection

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TVS diodes are electrical components that protect sensitive electronics from voltage spikes. The SMCJ78AHE3/57T is a specifically designed voltage surge suppressor manufactured by ZHEJIANG LONGGUANG Electronics. The device has wide ranging applications and its working principle is based on the idea of triggered avalanche breakdown.

Features of the SMCJ78AHE3/57T include an unidirectional breakdown voltage rating of 7.8V to 28V at 100 amperes, low dynamic resistance, and high clamping capability. Its small surface mount package measures 2.5mm x 2.5mm x 0.9mm, making it an excellent choice for high density printed circuit boards. Additionally, the device is RoHS compliant and Halogen Free.

In normal operation, the SMCJ78AHE3/57T does not allow current to flow through it. Instead, it functions in a “standby” mode where it can detect quickly increasing voltages and act as a protection barrier against them. When triggered, the device can conduct current up to itsrated peak pulse current up to 100 amperes.

The working principle of the device lies in its use of avalanche breakdown. This is the result of the device sustaining an extreme electric field which is created due to the accumulation of charge carriers. The avalanche breakdown triggers a chain reaction in the device, allowing it to absorb high Electric field and prevent any further surge.

The SMCJ78AHE3/57T finds its most important application in moving permanent magnets of high speed electric motors. The device actively suppresses voltages as high as 400V which could easily cause damage to the system if it is not absorbed. The surge absorption capabilities of the device allow the motor to operate safely at all times, making it highly valued for such applications.

The device is also used in a variety of consumer electronics and switches as a way to protect them from voltage spikes. This keeps the sensitive electronics connected to these devices operating safely at all times and substantially extends their lifespan. Essentially, the device presents a layer of protection between the powered unit and its circuits, ensuring that any harmful, uncontrollable voltages do not cause extensive damage.

In summary, the SMCJ78AHE3/57T Voltage Surge Suppressor is an incredible way to protect sensitive electronics from voltage and current surges. Offering an unidirectional breakdown voltage rating of 7.8V to 28V at 100 amperes in an extremely small surface mount package, the device is highly versatile and well suited for both industrial and consumer applications. Using the power of avalanche breakdown, this device can actively absorb surges up to 400V to shield connected electronics, making it an excellent choice for high speed electric motors.

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