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Test method of SMD capacitor service life - News

Test method of SMD capacitor service life

244 Published by at December 10,2019

How to check the life of the SMD capacitor?

SMD capacitors are mainly used to eliminate crosstalk of various high-frequency signals generated by the chip itself to other chips, so that each chip module can work normally without interference. In the high-frequency electronic oscillation circuit, the chip capacitor and the crystal oscillator and other components form an oscillation circuit to provide the required clock frequency for various circuits.

Test method of SMD capacitor service life

1.The test method                                             

Low-voltage chip capacitor (≤100V)                  SMD capacitor

Voltage: 1.5 times the rated operating voltage.

Time: 1000 hours.

Temperature: 125 ° C (NPO, X7R) 85 ° C (X5R, Y5V).

Charging current: should not exceed 50mA.

Storage conditions: room temperature.

Storage time: 24 hours (type I), or 48 hours (type II).

2.Test Standards:
ΔC / C
   Class I: ≤ ± 2% or ± 1pF, whichever is greater
   Class Ⅱ: B, X: ≤ ± 20%; E, F: ≤ ± 30%
ΔC / C:
   Class I: ≤ ± 2% or ± 1pF, whichever is greater
   Type II: B, X: ≤ ± 20%; E, F: ≤ ± 30%
  DF:
  ≤2 times the initial standard

3. The aging life of the chip capacitor is generally of little practical significance. Even if a capacitor is produced for many years, it can still be used normally.

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