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[Amps] 'heat spreader' sizing ??

To: Amps <>
Subject: [Amps] 'heat spreader' sizing ??
From: Dan Sawyer <>
Date: Mon, 31 Jan 2011 18:42:42 -0800
List-post: <">>
The project is to mount a 1KW, 2 transistor, board on a heat sink. The 
transistor centers are about 2 inches. The question is: What should the 
dimensions of the heat spreader be? I have seen dimensions of 1/4 x 2 x 
4 up to 1/2 x 4 x 7; that represents quite a range. The questions are:

1. What thickness is required. Is 1/4 sufficient?

2. What is the minimum effective distance from the edge of the devices? 
1/2 inch? 1 inch?


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