SpecNo.JELF243A-0153D-01 P7/8
MURATA MFG.CO., LTD
Reference Only
12.5 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］
Products shall be located in the sideways
direction to the mechanical stress.
(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 > D ∗1
(2) Add slits in the board separation part. A > B
(3) Keep the mounting position of the component away from
the board separation surface.
A > C
∗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.
(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.
12.6 Cleaning Conditions
Products shall be cleaned on the following conditions.
(1) Cleaning temperature shall be limited to 60°C max.(40°C max for IPA.)
(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. Frequency : 28kHz to 40kHz Time : 5 minutes max.
(3) Cleaner
1. Alternative cleaner
Isopropyl alcohol (IPA)
2. Aqueous agent
PINE ALPHA ST-100S
(4) There shall be no residual flux and residual cleaner after cleaning.
In the case of using aqueous agent, products shall be dried completely after rinse with de-ionized water in order to
remove the cleaner.
(5) Other cleaning
Please contact us.
12.7 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.
（Poor example）
(Good example)
Electrode
Electrode
Slit
Seam
D
B
C
Electrode
Electrode
Screw Hole
Recommended
