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From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Cooling a TO-220 7812 regulator
Date: Thu, 19 Sep 2024 19:40:26 +0100
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On 17/09/2024 19:55, Pimpom wrote:
> On 18-09-2024 12:12 am, Pimpom wrote:
>> On 16-09-2024 11:40 pm, john larkin wrote:
> 
>>>
>>> I agree about the standup vibration issue. Why not use a surface-mount
>>> dpak?
>>>
>> I considered using the D2pak version but decided against it. One 
>> reason is that I live in one of the most remote regions of a third 
>> world and we have nothing like Digikey here. So I've made it a habit 
>> to use only the most easily available parts. The D2PAK version of 78xx 
>> isn't in that category.
> 
> Forgot to mention that I've decided to place the 7812 on the copper side 
> and bolt it directly to the PCB. Changed the layout to accommodate the 
> reversed pin orientation.

Once you have bolted it down you might as well flow solder between the
heat sink tab and the pcb.  This will give you the best possible thermal
contact.

John