Familiar with the electronic element- CAP

Capacity is an important element in the circuit, its apply range very large and type utility.

Main Parameter

Capacity. The common capacity unit has “uF”, “nF”, “pF”.

Unit conversion: 1uF = 10^3nF = 10^6pF

For example:

  • 105 = 1uF = 1000nF = 1000000pF
  • 104 = 0.1uF = 100nF = 100000pF
  • 103 = 0.01uF = 10nF = 10000pF
  • 102 = 0.001uF = 1nF = 1000pF

Value of Permissible.

Electrolytic capacitor: 6.3V-450V (DC)

Ceramic capacitor: 25V-1000V (DC)

Accuracy code:

  • D = 0.5%
  • F = 1%
  • G = 2%
  • J = 5%
  • K = 10%
  • M = 20%

Temperature. The Capacity’s heat-resistant is 105℃.

Specification

  • A capacity has two types, MLCC and Aluminum Electrolytic capacitors. The MLCC has a fixed size.
inches
(mil)
centimeters
(mm)
L
(mm)
T
(mm)
a
(mm)
b
(mm)
020106030.60±0.050.30±0.050.10±0.050.15±0.05
040210051.00±0.100.50±0.100.20±0.100.25±0.10
060316081.6±0.150.80±0.150.30±0.200.30±0.20
080520122.00±0.201.25±0.150.40±0.200.40±0.20
120632163.20±0.201.60±0.150.50±0.200.50±0.20
121032253.20±0.202.50±0.200.50±0.200.50±0.20
181248324.50±0.203.20±0.200.50±0.200.50±0.20
201050255.00±0.202.50±0.200.60±0.200.60±0.20
251264326.40±0.203.20±0.200.60±0.200.60±0.20
  • In series connection and parallel connection can compound use, the calculation formula:
  • Parallel connection: plus two values, for example, 220uF parallel connection 330uF, the total capacity is 550uF.
  • Series connection: value = C1 * C2 / (C1+C2), for example, 220uF series connection 330uF, the total capacity is 220uF * 330uF / (220uF + 330uF) = 132uF
  • The function of capacity in circuit: filter, energy storage, decoupling and bypass.
  • In a Switch Power supply circuit, capacitive reactance(Xc) = 1/2Πfc, the smaller the capacitance, the larger capacitive reactance.

Application