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J57ltr · 07.31.2009, 12:06 PM

After weighing 100 SMT inductors the mean weight is .1134 Gram at 100 G’s that would be 11.34 Grams (about .4 Oz) pulling against this part. Negating flexing of the board should that be enough to dislodge the component? Did I calculate this wrong?

Reflow is great, but sometimes it’s hard to find a balance between enough heat to properly fuse the larger components without damage to the smaller components. Not saying you should change your process, hell if you only have these three failures then that is great, but as you suggested about G forces I don’t see the component being heavy enough to break from the board unless the board is flexing or it was a bad solder joint. Even at 1 gram the load would be less than ¼ pound.

Regards

Jeff

	(#46)
J57ltr RC-Monster Aluminum Offline Posts: 610 Join Date: Feb 2009 Location: Tomball/ Houston Tx.	07.31.2009, 12:06 PM After weighing 100 SMT inductors the mean weight is .1134 Gram at 100 G’s that would be 11.34 Grams (about .4 Oz) pulling against this part. Negating flexing of the board should that be enough to dislodge the component? Did I calculate this wrong? Reflow is great, but sometimes it’s hard to find a balance between enough heat to properly fuse the larger components without damage to the smaller components. Not saying you should change your process, hell if you only have these three failures then that is great, but as you suggested about G forces I don’t see the component being heavy enough to break from the board unless the board is flexing or it was a bad solder joint. Even at 1 gram the load would be less than ¼ pound. Regards Jeff The Warnings & Cautions discussed in this manual cant cover all possible conditions/situations. It must be understood that common sense and caution are factors which cant be built into this product.