What Is a Schottky Diode?
1 min read
Quick answer
A Schottky diode is a type of diode that uses a metal–semiconductor junction instead of a classic P–N junction, giving it a very low forward voltage drop (~0.3 V) and a high switching speed.
How It Differs From an Ordinary Diode
| Property | Silicon diode | Schottky |
|---|---|---|
| Forward voltage (Vf) | ~0.7 V | ~0.3 V |
| Speed | Medium | Very high |
| Reverse leakage | Low | Higher |
The Low Voltage Drop Advantage
A low Vf means less power lost (heat) in the diode. That's why it improves efficiency in high-current power circuits.
High Speed
A Schottky stores very little charge, so it turns on and off very fast and is ideal for high-frequency switching.
Where Is It Used?
Switch-mode power supplies (SMPS), reverse-polarity protection, OR-ing (power combining) and high-frequency rectification.
Limitations
Its reverse breakdown voltage (PIV) is low and its reverse leakage current is higher, so it isn't suitable where high voltage is required.
Common Mistakes
- Using it at high reverse voltage: the low PIV lets it break down.
- Forgetting leakage when hot: reverse leakage grows quickly as temperature rises (risk of thermal runaway).
- Assuming it's a standard diode: the low Vf can cause unexpected behavior in some threshold circuits.
Frequently Asked Questions
Why is the Schottky preferred in power supplies?+
Thanks to its low voltage drop and high speed it runs cool and works efficiently at high frequency.
What is the Schottky's drawback?+
Low reverse breakdown and higher reverse leakage; it isn't suitable for high-voltage applications.
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