What is the difference between Schottky and Fast Recovery Diode?

Hello
What is the difference between Schottky and Fast Recovery Diode?
i read more difference and sites but i can't know because they don't tell me the advantages of Schottky and Fast recovery diode

Thanks

Fast recovery diode is a type of PN diode meant for quick turn-off when the voltage is reversed.

Schottky diode has no PN junction, but a N-metal junction.

Thanks
i want to more.
isn't schottky a fast diode?why we produce another pn diode that said fast recovery diode?

baby_1 said:

Thanks
i want to more.
isn't schottky a fast diode?why we produce another pn diode that said fast recovery diode?

Click to expand...

Sottky diodes are fast, they can be used well into microwave frequencies (some gigahertz) but usually don't witstand large currents and are prone to electrostatic charge damage.

Fast recovery silicon diodes are usually much more rugged, it is the type of diode you find in SMPS (just an example).

Found this excellent write-up on the difference, rather than trying to write the book myself. Enjoy!

"A fast recovery diode stops conducting quickly when a reverse charge in imposed across it's junction. The quicker the better, as this limits the voltage transient and associated ringing resulting from a change in current across the internal inductance of the diode and it's leads (di/dt). In practice, even with a super fast recovery silicone diode, such as that exhibited by the popular 1N914, a voltage transient will still be created since the recovery event is fast (di/dt again). Our semiconductor industry addresses this by designing a "fast-soft recovery" characteristic into some of their diodes and these have generally garnered wide acceptance. Snubber networks further mitigate the negative effects of di/dt.

A schottky diode incorporates a different junction topology which produces a lower voltage drop associated with it - thus lower power loss and better efficiency. The recovery is fairly fast, and happens to exhibit an indigenous fast-soft recovery characteristic making it near ideal for many switching applications. But, in general it is the low forward drop that generally marks this device for a specific circuit application. Schottky diodes have a couple of undesirable attributes. They exhibit a higher leakage current than their silicon junction brethren, as well as limited blocking voltge due to their junction structure. These two characteristics often negate it from being used in many applications."

Excerpt from Fast recovery vs. Schottky diodes

Can use Fast recovery silicon diodes in RF circuit such as microwave circuit?

What is the purpose of the diode in your application and can you say something about frequency, current en voltage?

When dealing with applications where the diode is used as an RF synchronized (natural) switch (for example up or down conversion mixer) or rectifier (power detector, demodulator), mostly schottky diodes are used because of their fast turn-off behavior. In the past you saw so-called PN junction point contact diodes, but since many years these have been replaced by schottky junction diodes.

Less known: PN junction diodes also have a forward turn-on time. In otther words, it takes some time before the diode will fully conduct after applying forward bias voltage.