SMP18-E3/85A

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TVS - Diodes are widely used in a variety of applications to protect electronics circuits from electrical overshoot and also to protect against the presence of surges and spikes, and SMP18-E3/85A is one of them. It is a low power voltage derating, unidirectional, silicon avalanche diode which is specially designed for general-purpose high-performance ESD protection.

SMP18-E3/85A has a very wide range of applications such as power supply, AC/DC adaptor, IT systems, telecom and communication, LED, mocrowave communication, solar energy, and automotive devices. The device offers multi-purpose ESD protection with a working condition from -55℃ to 150℃. It can also provide unique applications in high-end systems and telecoms which requires integration of several protection functions on a single chip. Moreover, the device delivers excellent ESD current and low leakage current.

The working principle of the SMP18-E3/85A is based on its construction. It is constructed with a metal oxide semiconductor (MOS) combined with several layers of polysilicon. When a surge is applied to the device, the voltage on the MOS transistor becomes large enough to cause an avalanche breakdown in the polysilicon layers. This create an avalanche current path for high diode current, and at the same time, an additional avalanche voltage drop appears in the device. This capability allows SMP18-E3/85A to maintain low on-state voltage drop and very large transient current handling capability.

SMP18-E3/85A also features an excellent clamping capability and dynamic resistance. Its clamping voltage is working between 4.6V to 6.5V, and it can run with a dynamic resistance under 0.5 Ohm. Furthermore, it also offers excellent thermal stability and very reliable mechanical. The device is an ideal solution for providing overvoltage protection for a variety of applications.

In conclusion, SMP18-E3/85A is a great TVS diode with a wide range of applications and excellent performance. It offers excellent ESD current and leakage current with a wide working condition. Moreover, it also features a unique set of protection functions on a single chip and excellent clamping capability with a dynamic resistance under 0.5 Ohm. Thus, it is an ideal choice for providing over voltage protection in many different applications.

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