PVM4 Series Notice

c Notice (Operating and Storage Conditions)

c Notice (Rating)

1. When using with partial load (rheostat), minimize

the power depending on the resistance value.

2. The maximum input voltage to a trimmer

potentiometer should not exceed (P·R)^1/2 or the

maximum operating voltage, whichever is smaller.

c Notice (Soldering and Mounting)

Continued on the following page.

R50E.pdf

Jul.23,2012

23

• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.

4

1. Store in temperatures of -10 to +40°C and

relative humidity of 30-85%.

2. Do not store in or near corrosive gases.

3. Use within six months after delivery.

4. Open the package just before using.

5. Do not store under direct sunlight.

6. If you use the trimmer potentiometer in an

environment other than listed at right, please

consult with a Murata factory representative prior

to using.

The trimmer potentiometer should not be used under

the following environmental conditions:

(1) Corrosive gaseous atmosphere

(Ex. Chlorine gas, Hydrogen sulfide gas, Ammonia

gas, Sulfuric acid gas, Nitric oxide gas, etc.)

(2) In liquid

(Ex. Oil, Medical liquid, Organic solvent, etc.)

(3) Dusty/dirty atmosphere

(4) Direct sunlight

(5) Static voltage or electric/magnetic fields

(6) Direct sea breeze

(7) Other variations of the above

1. Soldering

(1) Can be soldered by reflow soldering method, flow

soldering method, and soldering iron.

(2) Use our standard land dimension. Excessive land

area causes displacement due to the effect of

the surface tension of the solder. Insufficient

land area leads to insufficient soldering

strength of the chip.

(3) Soldering conditions

Refer to the temperature profile.

If the soldering conditions are not suitable,

e.g., excessive time and/or excessive temperature,

the trimmer potentiometer may deviate from the

specified characteristics.

(4) Apply the appropriate amount of solder paste.

The thickness of solder paste should be printed

from 100 micro m to 150 micro m and the

dimension of land pattern used should be Murata's

standard land pattern at reflow soldering.

Insufficient amounts of solder can lead to

insufficient soldering strength on PCB.

Excessive amounts of solder may cause bridging

between the terminals.

(5) The soldering iron should not come in contact

with the case of the trimmer potentiometer. If

such contact does occur, the trimmer

potentiometer may be damaged.

2. Mounting

(1) Do not apply excessive force, preferably 9.8N

max. (Ref. 1kgf) when the trimmer potentiometer

is mounted to the PCB.

(2) Do not warp and/or bend the PC board to protect

trimmer potentiometer from breakage.

(3) In chip placers, the recommended size of the

cylindrical pick-up nozzle should be outer

dimension 4.0mm dia. and inner dimension 2.0mm

dia.

3. Cleaning

Isopropyl alcohol and ethyl alcohol are available

materials for cleaning.

For other materials, please consult with a Murata

factory representative prior to using.