Si510/511
2. Solder Reflow and Rework Requirements for 2.5x3.2 mm Packages
Reflow of Silicon Labs' components should be done in a manner consistent with the IPC/JEDEC J-STD-20E
standard. The temperature of the package is not to exceed the classification Temperature provided in the standard.
The part should not be within -5°C of the classification or peak reflow temperature (T
) for longer than 30
PEAK
seconds. Key to maintaining the integrity of the component is providing uniform heating and cooling of the part
during reflow and rework. Uniform heating is achieved through having a preheat soak and controlling the
temperature ramps in the process. J-STD-20E provides minimum and maximum temperatures and times for the
preheat/Soak step that need to be followed, even for rework. The entire assembly area should be heated during
rework. Hot air should be flowed from both the bottom of the board and the top of the component. Heating from the
top only will cause un-even heating of component and can lead to part integrity issues. Temperature Ramp-up rate
are not to exceed 3°C/second. Temperature ramp-down rates from peak to final temperature are not to exceed
6°C/second. Time from 25°C to peak temperature is not to exceed 8 min for Pb-free solders.
Rev. 1.4
11
SILICON [ SILICON ]
