LENS
3.3 Y-axis Misalignment of
Castellation
EDGE
In the Y-direction, the unit does
not self-align after solder reflow.
It is recommended that the unit
be placed in line with the fiducial
mark (mid-length of land pad.)
FIDUCIAL
This will enable sufficient land
1
length (minimum of / land
2
MINIMUM 1/2 THE LENGTH
OF THE LAND PAD
length.) to form a good joint.
See Fig 5.0.
Y
Figure 5.0. Section of a castellation in Y-axis.
3.4 Example of Good HSDL-3612-
007/-037 Castellation Solder Joints
This joint is formed when the
printed solder paste volume is
adequate, i.e. 0.30 cubic mm and
reflowed properly. It should be
reflowed in IR Hot-air convection
reflow oven. Direction of board
travel does not matter.
Photo 5.0. Good solder joint.
4.0 Solder Volume Evaluation and
Calculation
Geometry of an HSDL-3612-007/
-037 solder fillet.
0.425
0.20
0.70
0.8
1.2
0.7
0.4
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
