SpecNo.JELF243A-0047W-01
P7/8
Reference Onl
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］
a
Products shall be located in the sideways
b
direction (Length:a
stress.
<b) to the mechanical
Poor example
〈
〉
Good example
〈
〉
(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
B
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.
D
A
a
b
Slit
Length:a b
(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
11.7 Cleaning Conditions
Products shall be cleaned on the following conditions.
(1) Cleaning temperature shall be limited to 40°C max.
(2) Ultrasonic cleaning shall comply with the following conditions with avoiding the resonance phenomenon at
the mounted products and P.C.B..
Power : 20 W / l max.
(3) Cleaner
Frequency : 28kHz to 40kHz
Time : 5 minutes max.
1. Alternative cleaner
・Isopropyl alcohol (IPA)
2. Aqueous agent
Aqueous agent should not be used because it may cause quality deterioration.
(4) Other cleaning
Please contact us.
11.8 Resin coating
The inductance value may change due to high cure-stress of resin to be used for coating/molding products. An open
circuit issue may occur by mechanical stress caused by the resin, amount/cured shape of resin, or operating condition
etc. Some resin contains some impurities or chloride possible to generate chlorine by hydrolysis under some operating
condition may cause corrosion of wire of coil, leading to open circuit. So, please pay your careful attention when you
select resin in case of coating/molding the products with the resin. Prior to use the coating resin, please make sure no
reliability issue is observed by evaluating products mounted on your board.
11.9 Caution for use
Sharp material such as a pair of tweezers or other material such as bristles of cleaning brush, shall not be touched to the
winding portion to prevent the breaking of wire.
MURATA MFG.CO., LTD
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