SMDJ78A

Voltage - Clamping (Max) @ Ipp:	126V
Supplier Device Package:	DO-214AB (SMCJ)
Package / Case:	DO-214AB, SMC
Mounting Type:	Surface Mount
Operating Temperature:	-65°C ~ 150°C (TJ)
Capacitance @ Frequency:	--
Applications:	General Purpose
Power Line Protection:	No
Power - Peak Pulse:	3000W (3kW)
Current - Peak Pulse (10/1000µs):	23.8A
Series:	SMDJ
Voltage - Breakdown (Min):	86.7V
Voltage - Reverse Standoff (Typ):	78V
Unidirectional Channels:	1
Type:	Zener
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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SMDJ78A application field and working principle

SMDJ78A is a TVS - Diodes, a type of device used to protect sensitive electronic devices from external electrical surges such as those caused by lightning. It’s a form of transient voltage suppression diode that mounts onto printed circuit boards and connected directly to the power supply. The SMDJ78A TVS diode combines proven Zener with a state-of-the-art avalanche technology providing a very low let-through voltage, and a low dynamic resistance.

SMDJ78A Application Field

The SMDJ78A could be used in a variety of applications since it offers excellent and fast protection for a wide voltage clamping range. When installed and properly designed into a device, its primary purpose is to defend against a sudden and long-lasting power surge caused by static electricity, lightning, or even by faulty wiring. For example, it is used in applications such as DC power supplies, communication systems, power input/output, telecommunication equipment, computers, and consumer products. Additionally, SMDJ78A TVS devices are also suitable for protecting equipment from Electro-Static Discharge (ESD) and other transient surge protection applications.

SMDJ78A Working Principle

The SMDJ78A TVS diode consists of two series-connected Zener diodes and one avalanche diode in parallel with a clamp. When the surge voltage exceeds the SMDJ78A\'s breakdown voltage, the avalanche diode begins to replicate itself and conduct the surge current to reduce the over-voltage. During the efficient current surge, the Zener diodes will react as a varistor when their breakdown voltage is exceeded. This breakdown voltage is usually lower than the avalanche voltage; thus, the Zener diode avalanche diode works as a for current.The avalanche diode works in a short time interval, the avalanche current is usually far lower than the surge current and will not take effect until the voltage reaches the breakdown voltage. The Zener diodes can be clamped by high reverse voltages, thus the lower peak voltage is reached.

Conclusion

The SMDJ78A has many advantages, including fast response times, high-voltage clamping performance, and temperature compensation. Its low clamping voltage protect expensive electronic components against voltage spikes. Furthermore, its reverse polarity protection ability gives engineers more space to design their circuits. It is also built to be compatible with high-frequency circuits. Overall, the SMDJ78A is an ideal voltage protection device that is reliable in use. It is widely used to protect sensitive electronic devices from electrical surges caused by wind, lightning, static electricity, and even high-frequency power surges. As the SMDJ78A continues to improve, it will be increasingly used in more areas.

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