Forums

Fet G-S zener

Started by George Herold October 11, 2018
On Friday, October 12, 2018 at 5:14:00 AM UTC-4, piglet wrote:
> On 11/10/2018 17:37, George Herold wrote: > > Well I just blew out the G-S junction of a fet. I'm going to redesign circuit > > (Assuming you wrote about a MOSFET rather than a JFET then) Strictly > speaking you didn't blow the "junction" because a mosfet gate has no > junction, what happened was you broke down the gate insulation > dielectric material. > > I think John Larkin reported that +/-20Vgs rated parts typically > ruptured above 70V. > > piglet
Right, I blew out the gate and maybe made a junction. I'm not sure exactly how much overvoltage, but a quick calc would say 5 x 15V.. ~70V. (STN4NF20L) I'm not going to repeat the experiment... only 4 pieces left. :^) George H.