At the end of 2017 the BF862 JFET transistor got end-of-life. Currently, as far as I can find, the entire BF86x family has a "not recommended for new design" status. The BF862 was one of the lowest noise JFET's available and practically almost the world-wide best choice for charge amplifiers in nuclear applications.
Since I'm using it extensively in many applications of such kind I would like to know what replacement do You recommend? It doesn't have to be NXP part though.
The replacement criteria are:
- industrial temperature range;
- lowest possible noise;
- low current at this noise;
- negligible input leakage;
- high bandwidth;
- low cut-off voltage.