| ??? 07/16/10 13:41 Read: times |
#177321 - Important proviso Responding to: ???'s previous message |
Per Westermark said:
Not sure if he was talking about a manufacturer. "He" (Rob Klein) said:
I visited a respectable board-assembly house and was told they yielded around 25% on QFN packages. Per Westermark said:
All chips should be possible to solder with 99.9... percent yield when machine-soldered in a calibrated process. "in a calibrated process" is a very important proviso! It can take a few runs to get the "calibration" right - so prototype yields might well appear "low" Also, the board design has to be right in accordance with the manufactuer's processes. And, if the manufacturer hasn't done that specific package type before, you might be helping them to write their design rules! |
