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Mechanical & Layout Information
Figure 13 – SiP package mechanicals; LGA pad, package height
Figure 14 – Recommended PCB Receiving Pattern.
and pad location dimensions – inches.
QPI-10 PCB Layout Recommendations
The filtering performance of the QPI-9 and –10 is
sensitive to capacitive coupling between its input and
output pins. Parasitic plane capacitance must be kept
below 1 pico-Farad between inputs and outputs using
the layout shown above and the recommendations
described below to achieve maximum conducted EMI
performance.
To avoid capacitive coupling between input and output
pins, there should not be any planes or large traces
Figure 15 – Recommended PCB receiving footprint.
Figure 16 – Recommended PCB layout on a 2 layer board
Post Solder Cleaning
Picor lidded QP SIPs are not hermetically sealed and must
not be exposed to liquid, including but not limited to
cleaning solvents, aqueous washing solutions or
pressurized sprays.
When soldering, it is recommended that no-clean flux
that run under both input and output pins, such as a
ground plane or power plane. For example, if there
are two signal planes or large traces where one trace
runs under the input pins, and the other under the
output pins, and both planes over-lap in another area,
they will cause capacitive coupling between input and
output pins. Also, planes that run under both input
and outputs pins, but do not cross, can cause capacitive
coupling if they are capacitively by-passed together.
Figure 16 shows the recommended pcb layout on a 2
layer board. Here, the top layer planes are duplicated
on the bottom layer so that there can be no over-
lapping of input and output planes. This method can
be used for boards of greater layer count.
Ordering Information
solder be used, as this will insure that potentially
corrosive mobile ions will not remain on, around, or
under the module following the soldering process.
For applications requiring water wash compatibility the
“–01” open frame version should be used.
Picor Corporation ? www.picorpower.com
Part
Number
QPI-10LZ
QPI-10LZ-01
Description
QPI-10 LGA Package, RoHS Compliant
QPI-10 LGA, RoHS Compliant
Open Frame Package
QPI-10 Data Sheet Rev. 1.4 Page 7 of 8
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