SpecNo.JELF243A-0042R-01
P7/9
11.4 Reworking with soldering iron.
The following conditions must be strictly followed when using a soldering iron.
Pre-heating
150°C,1 min
350°C max.
80W max.
3mm max.
3(+1,-0)s
Tip temperature
Soldering iron output
Tip diameter
Soldering time
Times
2 times
Note : Do not directly touch the products with the tip of the soldering iron in order to prevent the crack
on the products due to the thermal shock.
11.5 Solder Volume
Solder shall be used not to be exceeded the upper limits as shown below.
Accordingly increasing the solder volume, the mechanical stress to Chip is also increased.
Exceeding solder volume may cause the failure of mechanical or electrical performance.
Upper Limit
Recommendable
T
t
1/3T≦t≦T
(T: Lower flange thickness)
11.6 Product's location
The following shall be considered when designing and laying out P.C.B.'s.
(1) P.C.B. shall be designed so that products are not subject to the mechanical stress due to warping the board.
[Products direction]
Electrode
Products shall be locatedin the sideways
direction (Length:a b) to the mechanical stress.
(Good example)
Poor example)
Electrode
(2) Components location on P.C.B. separation.
It is effective to implement the following measures, to reduce stress in separating the board.
It is best to implement all of the following three measures; however, implement as many measures
as possible to reduce stress.
Contents of Measures
Stress Level
(1) Turn the mounting direction of the component parallel to
the board separation surface.
A
A
A
>
>
>
D 1
B
(2) Add slits in the board separation part.
(3) Keep the mounting position of the component away from
the board separation surface.
C
C
Seam
1 A > D is valid when stress is added vertically to
the perforation as with Hand Separation.
If a Cutting Disc is used, stress will be diagonal to
the PCB, therefore A > D is invalid.
B
Electrode
Electrode
D
A
Slit
(3) Mounting Components Near Screw Holes
When a component is mounted near a screw hole,
it may be affected by the board deflection that occurs
during the tightening of the screw. Mount the component
in a position as far away from the screw holes as possible.
Recommended
Screw Hole
MURATA MFG.CO., LTD