Re: The goo inside of IGBT modules.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

I'm not too familiar with those big bricks (we don't use things that large
where I work . . . just big TWTs and magnetrons!) but
I would imagine its a thermal conductive gel.

I have some CM600 bricks.  Starting bid . . . .$200.00 EACH!!!  hah ha (just
kidding)

Dan



 > Hi,
 >
 > Since there seem to be a handful of experienced power engineers
 > around, i was just curious, what is the true function of the gel type
 > stuff they put inside of big power semiconductors (ive seen it in
 > IGBTs as well as SCRs).  My thoughts were that it was to help contain
 > the explosion when they fail.  Also, that it may prevent moisture from
 > getting on the dies and shorting it all out (since the module casing
 > is not completely air tight).
 >
 > But what was more important to me was whether or not the goo serves
 > any use in removing heat from the dies?  Im not sure if this gel is a
 > thermal insulator or a conductor really... its hard to say.  Does
 > anyone know for sure?
 >
 > Steve
 >
 > PS. anyone have any IGBT bricks for sale?  Im always looking for
 > spares for my big coil!  Contact me off-list.