Dear Shammi Verma ,

I would like at first to advice you to look at the data sheet of the intended device.

You will find that it contains all the performance specifications and characteristics of the device including the normal operating conditions and the maximum ratings of the device.

In order to characterize a device as switch you need to determine the following performance parameters:

- The maximum on current of the device that the device can withstand without burning

- The maximum on voltage drop Von max

- The maximum on power which is simply Ion max times Von max

These parameters depends on the operating temperature of the device.

Then one turns his attention to the off sate:

- The maximum off voltage that ca be applied safely on the device.

Normally this Voff max is about half the breakdown voltage as rule of thumb.

- Then comes the maximum off or leakage current Ioff max.

- The maximum off power is the Voff max times Ioff max.

One has to avoid thermal runaway of the device by limiting this off power.

There are also performance parameters concerning the speed of the operation of the device:

It is the on time which is the time taken to reach 90 percent of its steady sate on current if it is turned on.

In case of turning off It is the off time which is the time for the current to fall from its steady sate value to the 10 percent of the steady sate value.

These are the necessary performance parameters for characterizing a switching device.

But the full specifications can be found in the data sheet provided by the manufacturers.

Best wishes

السلام عليكم دكتور عبد الحليم بعثت لكم رسالة على الخاص ارجو مساعدتي واكون ممتن لك جدا Abdelhalim abdelnaby Zekry

Dear Kahtan Adnan Hussain ,

Hope you are well!

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Abdelhalim