Precautions for Use

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Precautions for Use

All Products

The contents of the catalog are subject to change without notice.
Please contact us for the latest information.When using the product, please evaluate it thoroughly after considering the operating environment.
The following reports will be helpful when evaluating safety.
Japan Electronics and Information Technology Industries Association
JEITA RCR-1001C
Safety application guide on components for use in electronic and electrical equipment
Japan Electronics and Information Technology Industries Association
JEITA RCR-2121B
Safety application guide for fixed resistors for use in electronic equipment

Resistor

Operating Environment, Application

The operating environment for resistors is basically assumed to be normal temperature and humidity, and indoor use. If you wish to use them in other environments, please consult us after referring to the following.

  • Use in insulating oil → SR type (has an oil holes)
  • Use in resin mold → SSR type, FP type
  • Use in high vacuum → RG type (does not contain organic components)

Please also consider the possibility that insulating oil or resin components may affect the resistor.

Please evaluate thoroughly before using in harsh environments or for special purposes. Examples of harsh environments or special purposes include the following. If you have any concerns about how to use the product, please contact us.

  • Outdoor use. Salt air, rain, direct sunlight, etc.
  • Environments with dust, sand, or dirt
  • Environments with condensation or where liquids of some kind may adhere
  • High temperatures and high humidity・Corrosive gases, sulfurous gases
  • Static electricity, electromagnetic waves
  • Automobiles, trains, ships, aircraft, space equipment
  • Infrastructure facilities such as electricity, transportation, and information

Characteristics

When power is applied to a resistor, it generates heat. If an overvoltage is applied, it may smoke, catch fire, or explode. When using, do not exceed 50% of the rated power. However, the rated power represents the maximum power that can be continuously loaded at an ambient temperature of 25°C. If the ambient temperature exceeds 25°C, the maximum value is the value obtained by multiplying the rated power by the rated power ratio determined by the derating curve. Please refer to the specifications or contact us for the derating curve.
When evaluating the ambient temperature of a resistor, please take into consideration the heat generated by other components. If multiple heat-generating components are installed in close proximity, even if the individual heat generation is small, the components may become hot due to interactions between them.
Our resistors are made of ceramic as the base material. They may be damaged if dropped, shaken, or subjected to impact. Even if there is no visible abnormality, the ceramic base material may be damaged. Do not use resistors that have been suspected to be damaged.
Our resistors are designed to be used with DC voltage. Please thoroughly evaluate before using with AC voltage.
If a high voltage pulse is applied to the resistor, its characteristics may deteriorate. Please contact us regarding pulse resistance.

Implementation

Please refer to the specifications for soldering conditions. If exposed to longer than necessary or higher temperatures, the electrodes may be damaged.
When mounting chip resistors using mounting equipment, be careful of the stress applied to the resistor. If the stress is too strong, the resistor may be damaged.
After mounting, be careful of the stress applied to the board. Stress may be applied to the resistor through the board, causing it to be damaged. Do not use resistors as a structural member. If stress is applied, it may affect the characteristics and cause damage.
Do not solder the cap part of resistors with cap-type terminals (HVP types, some RH types, etc.). The heat generated during soldering may damage the connection between the terminals and the resistor.
When using resin casting, be careful of the stress from the hardening resin.
Please consult us if you wish to perform vacuum drawing. Some resistors (RH types, etc.) have a hollow part in the base material.

Cleaning

Ultrasonic cleaning may damage electrodes, ect especially in small chip products.
Resistors with resin-coated surfaces may deteriorate if immersed in organic solvents. After cleaning, make sure that no cleaning fluid remains on the resistor and dry it thoroughly. Organic solvents and heat from drying may cause the markings to disappear.

Storage

Store resistors in a clean environment at room temperature and humidity, avoiding dust, moisture, mist, etc.

Handling precautions

Do not touch resistors with bare hands. If skin oil (salt) adheres to the resistor, its insulation properties may deteriorate. Be careful not to handle resistors with sharp objects (such as metal tweezers) as this may cause scratches or damage.
If a resistor breaks, the fracture surface may be sharp and you may be injured if you touch it with bare hands, so do not touch it with bare hands.

Disposal

When disposing of resistors, please dispose of them appropriately after checking the relevant laws and regulations.

High voltage measuring instrument

When using a high-voltage measuring instrument, be sure to read the instruction manual carefully and be fully aware of the dangers associated with high voltage before using it.