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Temperature of FR4 vs Assembly Temperature

Question asked by Yesh on Sep 11, 2008
Latest reply on Oct 10, 2008 by Kenneth_Wood





I do have a small basic doubt.



Normal FR-4's Tg is 125 degree C and almost all components we select are of normal commercial grade (70 to 0C) .



How these FR-4 and components are withstanding at the high soldering temperature ? 180 degree C for  reflow and 220 + degree C for wave ?



Does the Time matter?