RR00-1097
Specification for
Chip resistor RR1220 series
0
13/14
8. Precautions in use
8.1 Storage
(1) Resistor shall be stored in a room where temperature and humidity must be controlled.
( temperature 5 to 35 deg C, humidity 45 to 85 % RH )
However, humidity keep it low, as it is possible.
(2) Resistor shall be stored as direct sunshine doesn't hit on it.
(3) Resistor shall be stored with no moisture, dust, a material that will make solderbility inferior, and a
harmful gas (hydrogen chloride, sulfurous acid gas, and hydrogen sulfide).
(4) Resistor shall be stored with keeping the minimum package unit with uncivilized sealed (Keep the state
of the taping).
8.2 Time limit to storage
(1) The storage time limit of the product is reckoned on the day when the product was shipped by our
company and made within one year.
(2) Confirm solderbility beforehand when you use the one that the time limit was passed.
8.3 Chip mounting
(1) When chip are mounted on the PC board, the protection coat of resistors must not be scratched. If it will
be scratched, it will make performance for moisture inferior.
(2) In case that resistor will be soldered by soldering iron, heating shall be done on the land, and soldering
iron must not hit on the resistor itself.
(3) In case that resin coating or resin seal will be made for a PC board after chip mounting, do washing and
drying it enough before coating or sealing. If ion bear or moisture will be sealed in resin coating, it will
make performance for moisture inferior sometimes.
For resinous use, it is necessary to set up enough the curing conditions. As it get improper for the
condition, change of a resistance value are large and are a case.
(4) According to shape, material, and pressure of clamping in chip mounting machine, there is the case that
crack will be appeared on resistor.
Control a shock energy for clamping resistor under 7
×
10
−４
J.
With a shock energy around clamping that says here, it is suited to a potential energy, in case that iron
block of 25g is dropped naturally to the resistor placed on iron plate for the height of 2.8mm.
(5) The glue to fix a resistor on the PC board around chip mounting, it is needed high insulation resistance
and great performance or moisture. And it is needed that these characteristics are not inferior in using
temperature range and a hot spot temperature to be acting.
8.4 Using and Handling
(1) It is necessary to investigate the performance and reliability enough when using under harsh environment.
Especially, the performance of the product is occasionally damaged when using with the dewy state or
ion material adhered.
(2) It is necessary to protect the edge and protection coat of resistors from mechanical stress.
(3) Handle with care when PC board is divided or fixed on support body, because bending of PC board after
chip mounting will make mechanical stress for resistors.
