john jard ...
>>
>> Neither dual, or 1 amp but in R.F. use I've never killed a low C, low Vd,
>> BAT81.
>>
>
>You mean the BAT18 PIN Diode? That one comes as a dual and is called
>BAT18-04 for the series pair. But as with a lot of EU parts no stock at
>Digikey. Also, its capacitance is about the same as that for the old BAV99.
>
>I've killed a lot of RF stuff because sometimes I get involved in power
>designs. Things like turning the ceramic of a resistor or cap into
>bubbly green glass. Mostly they look kind of cool after the smoke has
>wafted off.
I always thought PIN diodes have plenty of storage charge. This might not make it the best input protection diode if you want it to be "invisible" to your signal.
How about the dual BAT62? 0.35pF typical @ 0V. Its a Schottky, so at
0dBm signal you would need to clamp to the rails (or a biased zener). That would take another 0.1pF off when both are biased to a couple of volts.
Joop