Tomasz Sztejka

BF862 or other low noise JFET

Discussion created by Tomasz Sztejka on Jan 29, 2018
Latest reply on Nov 28, 2019 by Duncan Gray


  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.


Best regards,

 Tomasz Sztejka.