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3 Product handling & soldering
3.1
Packaging, shipping, storage and moisture preconditioning
For information pertaining to reels and tapes, Moisture Sensitivity levels (MSD), shipment and storage
information, as well as drying for preconditioning see the EVA-M8M Data Sheet [1] .
3.2
ESD handling precautions
ESD prevention is based on establishing an Electrostatic Protective Area (EPA). The EPA can be a small working
station or a large manufacturing area. The main principle of an EPA is that there are no highly charging materials
in the vicinity of ESD sensitive electronics, all conductive materials are grounded, workers are grounded, and
charge build-up on ESD sensitive electronics is prevented. International standards are used to define typical EPA
and can be obtained for example from International Electrotechnical Commission (IEC) or American National
Standards Institute (ANSI).
GNSS receivers are sensitive to ESD and require special precautions when handling. Particular care must be
exercised when handling patch antennas, due to the risk of electrostatic charges. In addition to standard ESD
safety practices, the following measures should be taken into account whenever handling the receiver.
•
Unless there is a galvanic coupling between the local GND (i.e. the
work table) and the PCB GND, then the first point of contact when
handling the PCB shall always be between the local GND and PCB
GND.
•
Before mounting an antenna patch, connect ground of the device.
•
When handling the RF pin, do not come into contact with any
charged capacitors and be careful when contacting materials that
can develop charges (e.g. patch antenna ~10 pF, coax cable ~50-
80 pF/m, soldering iron, ...)
•
To prevent electrostatic discharge through the RF input, do not
touch the mounted patch antenna.
•
When soldering RF connectors and patch antennas to the receiver's
RF pin, make sure to use an ESD safe soldering iron (tip).
Failure to observe these precautions can result in severe damage to the GNSS receiver!
3.3
Soldering
3.3.1 Soldering paste
Use of "No Clean" soldering paste is strongly recommended, as it does not require cleaning after the soldering
process has taken place.
Stencil Thickness:
The paste-mask geometry for applying soldering paste should meet the recommendations given in section
2.11.2.
UBX-14006179 - R02
100 to 150 µm for base boards
Early Production Information
EVA-M8M - Hardware Integration Manual
Local GND
handling & soldering
Product
GND
Page 27 of 45
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