Hello! When we look at our Schottky diodes, we notice that there are two types: Schottky rectifier diodes (SR Schottky diodes such as https://www.utmel.com/productdetail/nexperiausainc-pmeg3010ceh115-5832300) and Schottky barrier diodes (SBD Schottky diodes such as https://www.utmel.com/components/pmeg3050ep-schottky-barrier-rectifier-30v-5a-datasheet-pdf?id=1382). What makes these two Schottky diodes so different? Another issue is that most Schottky diodes have a junction capacitance of 400 to 500pF, according to my research. Many rectifier diodes have a lower junction capacitance. Is this typical? Will such a high junction capacitance lower the cut-off frequency to the point that, even if the Schottky diode's reverse recovery time is ignored, the high-frequency characteristics are still poor due to the big junction capacitance? Good listening! KA.
March 01, 2022
First, I am not an expert in diodes.
Note 1: they are both called barrier rectifier, but the first one is "very low Vf" while the second one is simple "low Vf".
Note 2: their capacitance is dependent of the reverse voltage. (Figure 3 for the first one, Figure 6 for the second one.)
Note 3: the allowed power dissipation seems to be the major difference between the two.
March 02, 2022
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