UMK105CG8R2DV-F Datasheet, PDF (13/17 Pages) Taiyo Yuden (U.S.A.), Inc – STANDARD MULTILAYER CERAMIC CAPACITORS

PRECAUTIONS
Precautions on the use of Multilayer Ceramic Capacitors
Stages
Precautions
Technical considerations
LWDC Recommended land dimensions for reflow-soldering
2/6
2.PCB Design
4
Type
105
107
212
L 0.52
50.8
1.25
W
1.0
1.6
2.0
A 0.18ʙ0.22 0.25ʙ0.3 0.5ʙ0.7
B 0.2ʙ0.25 0.3ʙ0.4 0.4ʙ0.5
C
0.9ʙ1.1 1.5ʙ1.7 1.9ʙ2.1
ʢunit: mmʣ
Ê¢2Ê£Examples of good and bad solder application
Items
Mixed mounting
of SMD and
leaded compo-
nents
Not recommended
Component
placement close
to the chassis
Hand-soldering
of leaded
components
near mounted
components
Horizontal
component
placement
Recommended
Pattern configurations
ʢCapacitor layout on panelized [breakaway] PC boardsʣ
1. After capacitors have been mounted on the boards, chips
can be subjected to mechanical stresses in subsequent
manufacturing processesʢPCB cutting, board inspection,
mounting of additional parts, assembly into the chassis, wave
soldering the reflow soldered boards etc.ʣ For this reason,
planning pattern configurations and the position of SMD ca-
pacitors should be carefully performed to minimize stress.
1-1. The following are examples of good and bad capacitor layout; SMD capacitors should
be located to minimize any possible mechanical stresses from board warp or deflection.
Not recommended
Recommended
Deflection of
the board
1-2. To layout the capacitors for the breakaway PC board, it should be noted that the
amount of mechanical stresses given will vary depending on capacitor layout. The
example below shows recommendations for better design.
˚^{ʂ ౰ࣾΧλϩάΛ͝࢖༻ͷࡍʹ͸ʮ౰ࣾ੡඼ʹؔ͢Δ͓அΓʯΛඞ͓ͣಡΈ͍ͩ͘͞ɻ}
1-3. When breaking PC boards along their perforations, the amount of mechanical stress
on the capacitors can vary according to the method used. The following methods
are listed in order from least stressful to most stressful: push-back, slit, V-grooving,
and perforation. Thus, any ideal SMD capacitor layout must also consider the PCB
splitting procedure.
˚^{ʂ Please read the "Notice for TAIYO YUDEN products" before using this catalog.}
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