Chip Resistors - Failure by Usage Environment and Failure Mode

Using chip resistors in an environment exceeding their product specifications may cause failures such as an increase in resistance value or an open circuit (wire breakage), or a reduction in resistance value or a short circuit. Use caution and refer to the table shown below. Before using the products, also check Caution Items for Safety. Caution Items for Safety .

Usage Environment   Failure   Failure Mode
                         
  Chemical
Cause
  Electrical
Cause
  Physical
Cause
 
                                     
                                     
  Attachment of
halogen components
      Migration               Resistance value reduction,
short circuit
 
                       
  *Case:
  Flux
  Post-flux
  Adhesive, etc.
                                 
        Electrolytic corrosion               Resistance value increase,
open circuit (wire breakage)
 
                       
                                   
  Environment
containing sulfur
      Electrolytic corrosion                
                       
  *Cases:
  Volcano,
  hot-spring area
  Exhaust gas, Oil
  vulcanized rubber, etc.
                               
        Sulfide                        
                               
                                   
  Excessive
mechanical stress
                      Electrode
separation
       
                               
  *Cases:
  Excessive
  solder quantity
  Excessive
  reflow profile
  Molded resin, etc.
                               
                        Solder crack        
                               
                                   
  Electrical overload               Resistive
element
burnout
               
                               
  *Cases:
  Voltage/current
  Static electricity
  Pulse, etc.
                                 
                Resistive
element
deterioration
              Resistance value reduction  
                               
                                     
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