On 11/12/22 9:39 AM, Manfred Mornhinweg wrote:
Miro, yes, Elecraft uses such high voltage rectifiers as PIN diodes in several of their products. They use true PIN diodes in some others, and sometimes they even mix them. What kind of diodes they use in each case, is surely a trade-off between total cost and performance.
Apparently, those 1000V PIV (the 1n4008) *are* PIN diodes - something about the voltage rating - the 800V versions are not.
However, there's some commentary about different manufacturers being different, and needing to check the data sheet for the reverse recovery time trr - it needs to be "long enough" (which I guess implies a big I region that has to be swept clear when reverse biased)
This is the issue - As a mfr can use the JEDEC number if your part meets the required datasheet values. If, you as a circuit designer are depending on "not on datasheet" numbers, some might work, some might not. (noise properties are notorious for this..)
Many schematics are available on theyr website. Just download them and look! For example download the manual of the KPA100, which has such diodes, and also the crystal-locked DC-DC converter I mentioned. And download the K3 schematics file, where you can see the KPA3 using a combination of SMD high voltage rectifier and true PIN diodes. Also the low power final amp of the KPA3 uses a rectifier as a PIN diode. The TR switch on the K3 RF board uses a combination of rectifier and PIN diodes. Same thing with the K3S.
