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Kai Klaas
11/09/05 06:26
  11/09/05 06:36

Read: 1736 times

#103477 - An illustration...
Responding to: Suresh R's previous message
Suresh said:
I would also like to know about the use of Thermal relief in PCB's.
should i use thermal relief when i connect the ground pin of components to the solid ground plane (in bottom layer).

To illustrate what I mean, and how to choose the thermal reliefs (I call them heat traps, by the way) have a look at the following example board I designed for another forum member some time ago:

Take care, in this little example all the many vias, which should be placed to connect the both ground panes on top and bottom layer are missing. Add them every cm or so. And add them especially to the ground fills placed between different digital signals! For these vias, which only connect the both ground planes and ground fills together thermal reliefs aren't needed, more, they would be highly disadvantageous because of avoidably increasing the impedance of ground.


List of 16 messages in thread
two layer PCB      Suresh R      11/04/05 23:56      
   +5VDC also drives PhotoMOS relays      Suresh R      11/05/05 00:13      
   Solid ground plane is needed!      Kai Klaas      11/06/05 05:18      
      what i have done is      Suresh R      11/07/05 10:19      
         what you have done ...      Andy Peters      11/07/05 11:36      
            Thermal relief's      Suresh R      11/08/05 03:09      
               You need a solid ground plane      Kai Klaas      11/08/05 08:03      
                  I want the best money can buy, but do no      Erik Malund      11/08/05 08:22      
                  Thermal relief in PCB's      Suresh R      11/08/05 11:24      
                     An illustration...      Kai Klaas      11/09/05 06:26      
                        went through the design but      Suresh R      11/10/05 04:46      
                           Thermal reliefs were demonstrated      Kai Klaas      11/10/05 05:30      
                           who are you posting to????      Erik Malund      11/10/05 06:14      
               thermal reliefs only ease soldering        Sasha Jevtic      11/08/05 12:37      
                  Resistance calculation for thrmal relief      Suresh R      11/08/05 22:35      
                     you better read .....        Abhishek Singh      11/10/05 05:56      

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