Can I replace BF245C JFET with J201 JFET?

bigmike216 · 4th December 2005, 01:04 AM

http://www.fairchildsemi.com/ds/BF%2FBF245C.pdf

http://www.fairchildsemi.com/ds/J2/J201.pdf

I understand pinout is backwards, but that's not a big deal.

bigmike216 · 7th December 2005, 07:14 AM

Anyone know?

wrenchone · 7th December 2005, 07:50 AM

Well, the "C" version of the Euro-fet is at the hgh end of the IDSS distribution in its device group, and the J201 will be on the low side of its device group, typically below 1ma. If you drop the 201 into a circuit designed to use the other FET, the bias will most likely be way off because of the difference in quiescent current. What is the circuit where you were planning to do this substitution?

4th December 2005, 01:04 AM	#1
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Can I replace BF245C JFET with J201 JFET? http://www.fairchildsemi.com/ds/BF%2FBF245C.pdf http://www.fairchildsemi.com/ds/J2/J201.pdf I understand pinout is backwards, but that's not a big deal.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
B1 jfet help .	early	Pass Labs	5	20th August 2009 08:34 AM
JFet BOZ	Tyimo	Pass Labs	14	30th April 2006 04:18 PM
How to use Jfet?	lumanauw	Pass Labs	5	7th April 2005 04:12 AM

New To Site?	Need Help?
Register to Participate Search Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


<a rel='nofollow' href='http://www.diyaudio.com/openx/www/delivery/ck.php?n=aa5cb2e9&cb=300320' target='_blank'><img src='http://www.diyaudio.com/openx/www/delivery/avw.php?zoneid=3&cb=300320&n=aa5cb2e9' border='0' alt='' /></a>	We're saving for a new server - help us to serve you by Donating Today and become a friend with benefits! Ads on/off / Custom Title / 2009 Tshirt / More PMs / Bigger Images / Advanced printing

7th December 2005, 07:14 AM	#2
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Anyone know?

7th December 2005, 07:50 AM	#3
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Well, the "C" version of the Euro-fet is at the hgh end of the IDSS distribution in its device group, and the J201 will be on the low side of its device group, typically below 1ma. If you drop the 201 into a circuit designed to use the other FET, the bias will most likely be way off because of the difference in quiescent current. What is the circuit where you were planning to do this substitution?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)