Help finding the right transistor.

Thread Starter

masteropie

Joined May 17, 2008
26
I have been browsing various sites today trying to find the best transistor for a project. Fairchild is down, i really like their product browser :( I am looking for a switch transistor. Anywhere from 10Vds to 100Vds and from 10mAds to 500mAds. Also under 5nA leakage at room temp. The faster the better.

The best i have found so far is the PN5432 JFET:
25Vds
150mAds
1nS Rise
30nS Fall
200pA Leakage

I don't like the 30nS fall time, 5nS would be nice. I was hoping for surface mount as well.

I would appreciate a push in the right direction. Thanks!
 

Thread Starter

masteropie

Joined May 17, 2008
26
Ya i have spent quite some time browning mouser. The problem is they don't list leakage.
 

mik3

Joined Feb 4, 2008
4,846
You can look at the datasheet of the MOS your interested in.
 

Thread Starter

masteropie

Joined May 17, 2008
26
Ya, i looked at at least a hundred today. I was wondering if there was a better way. Most datasheets don't have both leakage and rise/fall times anyways, since they are not important in most applications.
 

Ron H

Joined Apr 14, 2005
7,012
A discrete 24bit DAC. Its pretty simple, just 24 transistors and resistors.
You will be lucky to build a binary-input DAC with 10 bit accuracy and linearity using discrete parts. You can still build a 24 bit DAC, but it won't perform better than a 10 bit one.
 

mik3

Joined Feb 4, 2008
4,846
RonH is right. Real components have value tolerance, their characteristics change with temperature and so on. It would be better you buy a chip for this job. Why do you need such high resolution?
 
Top