Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
4.2 Mounting ELS31-VA/ELS51-VA onto the Application Platform
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ELS31-VA_ELS51-VA_HID_v01.000
2017-01-04
Confidential / Preliminary
Page 79 of 106
4.2
Mounting ELS31-VA/ELS51-VA onto the Application Plat-
form
This section describes how to mount ELS31-VA/ELS51-VA onto the PCBs (=printed circuit
boards), including land pattern and stencil design, board-level characterization, soldering con-
ditions, durability and mechanical handling. For more information on issues related to SMT
module integration see also
Note: To avoid short circuits between signal tracks on an external application's PCB and vari-
ous markings at the bottom side of the module, it is recommended not to route the signal tracks
on the top layer of an external PCB directly under the module, or at least to ensure that signal
track routes are sufficiently covered with solder resist.
4.2.1
SMT PCB Assembly
4.2.1.1
Land Pattern and Stencil
The land pattern and stencil design as shown below is based on Gemalto characterizations for
lead-free solder paste on a four-layer test PCB and a 120 micron thick stencil.
The land pattern given in
reflects the module‘s pad layout, including signal pads and
ground pads (for pad assignment see
).
Figure 43:
Land pattern (top view)