User's Manual

Application Note [Page 18]
EMW3166_Guide For User Design
4. SMT matters
Note for stencil aperture 4.1
The recommended stencil aperture: 0.12mm (0.1~0.15mm), laser polishing hole.
The recommended solder paste is SAC305 and lead free.
The recommended extend length of welding pad: 0.15mm. It can enhance the adhesive ability of
solder as shown below.
It can check the right position of the module by eyes if using SMT line without AOI testing to reduce the risk of cold
solder joint.
Figure 13 Recommended Stencil Aperture
Recommended reflow profile 4.2
Reflow times <= 2 times.
Peak temperature < 250°C.
Controlling the temperature according to the temperature curve can reduce the risk of welding.
Recommended reflow profile: