User's Manual

ETRX358x-LRS and ETRX358x-LRS

Although the undersides of the ETRX3 series modules are fully coated, no exposed copper, such

as through-hole vias, planes or tracks on your board component layer, should be located below the

ETRX3 series module in order to avoid ‘shorts’. All ETRX3 series modules use a multilayer PCB

containing an inner RF shielding ground plane, therefore there is no need to have an additional

copper plane directly under the ETRX3 series module.

Figure 11. Typical pad dimensions

Finally it is recommended to use no clean flux when soldering the ETRX358x family of modules

and to not use a washing process after reflow. If the process does require washing then care must

be taken that no washing agent is trapped underneath the shielding can after the drying process

has completed.