Need an electronics man overhere to name for me the rs component wich is the plastic stuff wich you can put between a component and the heatsink to overcome that the heatsink is positive etc. etc.

anyone on this one?

Tks

Do you mean silicone rubber? http://www.communica.co.za/ProductListing.aspx?cid=88f4791685504191ad0a8879c4f3e7bf

or closer

http://www.rsnewzealand.com/cgi-bin/bv/rswww/searchBrowseAction.do?com.broadvision.session.new=Yes&D=Silicone%20Impregnated%20Washers&Ntt=Sili cone%20Impregnated%20Washers&Ntk=I18NAll&Ntx=mode%20matchany&N=0&Nty=1&name=SiteStandard&forwardingPage=line&R=0403279& ;callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@1688073622.1162852024@@@@&BV_EngineID=ccdfaddjfdhfiljcefeceeldgondhgm.0&cacheID=nznet scape&Nr=avl:nz

[Edited on 6/11/06 by ReMan]

Put "Mica insulator" into the search

One here
TO220 transistor mica mount kit
linky

I've also come across plastic ones (ptfe?) but mica was recommended to me as being better by an engineer I respect.

Edit: OT but interesting http://en.wikipedia.org/wiki/Mica


[Edited on 6/11/06 by iank]

He said plastic??

I thought Mica in the first place but I would'nt describe it plastic, we'll see?
What is it to be used foe TKS?

Yes that is interesting Iank!

[Edited on 6/11/06 by ReMan]

Yes, if your heart is set on the plastic type you can buy sheets from RS to make any shape you want.
They don't say what it's made of except it's Silicon impregnated.

linky

[Edited on 6/11/06 by iank]

The big name in this gear is Bergquist, have a trawl round their website. A lot of the stuff is "one time thermoplastic" so 1st time it gets hot it "runs into the gaps" and the thermal resistance drops right off.
Bob

The generic name is "Thermal interface material"

The traditional material is mica, used with thermaly conductive grease. Horrible messy white stuff that gets everywhere, and the mica is very brittle.

The modern alternative is a silicon pad loaded with thermaly conductive particles.

The stuff that Bob mentioned is often refered to as "phase change" material, the pads used on CPU heatsinks are often made from this.

Few of the companies we use at work:
http://www.bergquistcompany.com/index.cfm?CFID=506866&CFTOKEN=17676106
http://www.lairdtech.com/pages/products/Thermal-Interface-Materials.asp
http://www.dowcorning.com/content/etronics/etronicspadsfilm/default.asp

where many fets are on.

but i need to put a shottky on!

because the heatsink is VDD (12volts) connected to the fets.

and the shottky is going between ground and motor positive but it still gets hot.

i need to connect it to the heatsink i need the mica sheet pass the heat on but to isolate my chip.

i use the pin in this case instead of the heatsink of the component.

Tks

i will also need a kind of bolt ring to seperate it..
[EDIT: saw it enters in the kit!]
SADLY that it costs 50euro cents in spain!! and postage is 7,5euro!

many thanxs, the strenght of the forum had been demonstrated again!

[Edited on 7/11/06 by tks]