（2）Examples of good and bad solder application
Items
Not eommended
Recommended
Mixed mounting of SMD and
leaded components
Component placement close to
the chassis
Hand-soldering of leaded
Components near mounted
components
Horizontal component
placement
◆Pattern configurations （Capacitor layout on PCBs）
1-1. The following is examples of good and bad capacitor layouts ; capacitors shall be located to minimize any
stresses from board warp or deflection.
possible mechanical
Items
Not recommended
Recommended
Place the product at a right
angle to the direction of the
anticipated mechanical
stress.
Deflection of board
1-2. The amount of mechanical stresses given will vary depending on capacitor layout. Please refer to diagram below.
1-3. When PCB is split, 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, please consider the PCB,
split methods as well as chip location.
3. Mounting
Precautions
◆Adjustment of mounting machine
1. When capacitors are mounted on PCB, excessive impact load shall not be imposed on them.
2. Maintenance and inspection of mounting machines shall be conducted periodically.
◆Selection of Adhesives
1. When chips are attached on PCBs with adhesives prior to soldering, it may cause capacitor characteristics degradation unless the
following factors are appropriately checked : size of land patterns, type of adhesive, amount applied, hardening temperature and
hardening period. Therefore, please contact us for further information.
◆Adjustment of mounting machine
1. When the bottom dead center of a pick-up nozzle is too low, excessive force is imposed on capacitors and causes damages. To avoid
this, the following points shall be considerable.
Technical
（1）The bottom dead center of the pick-up nozzle shall be adjusted to the surface level of PCB without the board deflection.
（2）The pressure of nozzle shall be adjusted between 1 and 3 N static loads.
considerations
（3）To reduce the amount of deflection of the board caused by impact of the pick-up nozzle, supporting pins or back-up pins shall be
used on the other side of the PCB. The following diagrams show some typical examples of good and bad pick-up nozzle
placement:
▶ This catalog contains the typical specification only due to the limitation of space. When you consider the purchase of our products, please check our specification.
For details of each product (characteristics graph, reliability information, precautions for use, and so on), see our Web site (http://www.ty-top.com/) .
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TAIYO YUDEN [ TAIYO YUDEN (U.S.A.), INC ]
