Heatsink for LM2940

servello

Greetings,

I have been looking to purchase a few heatsinks. I found a bunch that are TO-220, but they are huge. I'm looking for the size that is used on the BOE (LM2940-5.0). I also searched this forums' archives and couldn't find any reference. Also, it is not listed (that I could find) in the WAM?, BS Reference and Syntax, or as a part to be purchased on the Parallax website.

Any help is much appreciated.

-Dominic

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- It's just a scratch, but it's a nasty scratch

Forrest

I don't think Parallax sells heatsinks separately. Radio Shack sells a slightly larger model for $1.49 - P/N 276-1363 and it's available in most stores.

Sparkfun.com sells one that's nearly the same size as Parallax's for $0.95 P/N PRT-00121

servello

Hello, Forrest.

The radio shack heatsink you mention is the one I purchased, and it's gigantic compared to the relatively small LM2940 or LM7805.

However, the part number you gave from Sparkfun, states that it is a "Small heat sink". I just ordered 5 of them.

Indeed, Parallax does not sell the heat sink seperately. This is not really a problem, in my opinion. Although it would be nice if they listed the part number for the heatsink they use.

Thanks for the help.

-Dominic

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- It's just a scratch, but it's a nasty scratch

PJAllen

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=158051&productId=158051

servello

Thanks, PJ.

That heatsink also looks perfect. I'll be ordering a few from Jameco just in case the Sparkfun heatsinks are too large.

-Dominic

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- It's just a scratch, but it's a nasty scratch

servello

*** Update ***

Just in case anyone was wondering, the heatsink at Jameco that PJ pointed me to, was the perfect size for the LM7805 and LM2940.

The heatsink from Sparkfun was still too large for what I wanted.·But, of course it still could have been used (and may even dissipate the heat better). It's just that I was looking for the size used on the BOE (as I mentioned in my original post.)

Thanks again.

-Dominic

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- It's just a scratch, but it's a nasty scratch

sam_sam_sam

Here is one more Heat Sink to add to what has been said

I use these all the time here is the link

http://www.radioshack.com/product/index.jsp?productId=2102857&cp=&sr=1&origkw=heat+sinks&kw=heat+sinks&parentPage=search

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··Thanks for any··that you may have and all of your time finding them

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Sam

Forrest

Sam,

That Radio Shack heat sink is huge compared to the others. The goal was to find a smaller heat sink that matched the size used on the BOE.

Forrest