Vic, Well, from a designers perpective, the answer is no. There are usually so many other prioraties in the component placement such as trace length, noise, EMI, etc., which determine functionality that thermal mass considerations just don't come into play. The only time we might look at thermal mass was if we were having huge problems in assembly which could not be solved any other way. And even then, we would look at doing the least modification possible to make it work. This has been one designers viewpoint. Don Walker [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************