®
Accu-P
Application Notes
GENERAL
HANDLING
Accu-P® SMD capacitors are designed for soldering to printed
circuit boards or other substrates. The construction of the
components is such that they will withstand the time/temper-
ature profiles used in both wave and reflow soldering meth-
ods.
SMD capacitors should be handled with care to avoid damage
or contamination from perspiration and skin oils. The use of
plastic tipped tweezers or vacuum pick-ups is strongly recom-
mended for individual components. Bulk handling should
ensure that abrasion and mechanical shock are minimized. For
automatic equipment, taped and reeled product gives the
ideal medium for direct presentation to the placement
machine.
CIRCUIT BOARD TYPE
COMPONENT PAD DESIGN
The circuit board types which may be used with Accu-P® are
as follows:
Component pads must be designed to achieve good
joints and minimize component movement during reflow
soldering. Pad designs are given below for both wave and
reflow soldering.
All flexible types of circuit boards
(eg. FR-4, G-10) and also alumina.
For other circuit board materials, please consult factory.
The basis of these designs is:
a. Pad width equal to component width. It is permissible to
decrease this to as low as 85ꢁ of component width but
it is not advisable to go below this.
b. Pad overlap 0.5mm beneath large components. Pad
overlap about 0.3mm beneath small components.
c. Pad extension of 0.5mm for reflow of large components
and pad extension about 0.3mm for reflow of small com-
ponents. Pad extension about 1.0mm for wave soldering.
REFLOW SOLDERING
PAD DIMENSIONS: millimeters (inches)
01005
0201
0402
0603
0805
1210
Accu-P®
Accu-P®
Accu-P®
Accu-P®
Accu-P®
Accu-P®
0.17
(0.007)
0.22
(0.009)
0.26
(-0.010)
0.6
(0.024)
0.85
(0.033)
1.0
(0.039)
1.0
(0.039)
0.20
(0.008)
0.78
0.26
(0.030) (-0.010)
0.26
(-0.010)
1.7
0.5
2.3
0.6
(0.068) (0.020)
(0.091) (0.024)
0.34
(0.013)
3.0
1.0
0.6
(0.024)
(0.118) (0.039)
0.85
(0.033)
4.0
2.0
0.55
(0.022)
(0.157) (0.079)
0.8 (0.031)
1.0
(0.039)
1.25 (0.049)
1.0
(0.039)
2.5 (0.098)
050118
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