Shottky versus rectifier diode
Shottky versus rectifier diode
(OP)
In parts catalogs, the diodes are often divided as shottky and rectifier. I realize that there are performance differences (speed), but are these two items really different? Can someone explain the difference between a shottky diode and a rectifier diode?
thanks
EE
thanks
EE





RE: Shottky versus rectifier diode
RE: Shottky versus rectifier diode
John D
RE: Shottky versus rectifier diode
Because there is only one semiconductor side, which is usually heavily doped, a Schottky diode will have a drastically shorter recovery time, since there is little or no charge storage in the junction.
However, Schottkys, if I recall correctly generally have lower reverse breakdown voltages.
TTFN
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RE: Shottky versus rectifier diode
RE: Shottky versus rectifier diode
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Shottky versus rectifier diode
Keith Cress
kcress - http://www.flaminsystems.com
RE: Shottky versus rectifier diode
RE: Shottky versus rectifier diode
Keith Cress
kcress - http://www.flaminsystems.com
RE: Shottky versus rectifier diode
'However, Schottkys, if I recall correctly generally have lower reverse breakdown voltages'
That is true for Schottky-Diodes based on Silicon, but today Schottky-diodes made from Siliconcarbide (SiC) are readily available and already find significant use in PFC-circuits.
To all:
If considering the use of these devices for rectification you should consider that current state of the art for efficient rectification (voltages up to 48 V) is sychronous rectification using Mosfets.
RE: Shottky versus rectifier diode
RE: Shottky versus rectifier diode
I have been using Schottky diodes for circuit protection, for example tied from analog inputs to 5 volts to prevent transients and over voltage from blowing the ADC. I used them because of their response time.
I had no idea how bad their reverse leakage was. I guess I need more practice at reading data sheets. A 1N5819 has 10mA reverse leakage at 100 degrees C at 40V reverse voltage - I have no idea how it is at lower voltages, where I use them. A 1N4001 has 4 microA (how do you enter special characters?). The Schottky reverse leakage hasn't been a problem so far as I've noticed, but boy howdy, it certainly could be.
RE: Shottky versus rectifier diode
TTFN
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RE: Shottky versus rectifier diode
We used to use 1N6263s for A2D front end protection. High temperature would wreak havoc. High temps like a measly 45C.
They leak like a sieve when they get warm.
Keith Cress
kcress - http://www.flaminsystems.com