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| 型号： | 12062R824K7B20G |
| 元件分类： | 数据传输滤波器 |
| 英文描述： | 1 FUNCTIONS, 16 V, FEED THROUGH CAPACITOR |
| 封装： | EIA STD PACKAGE SIZE 1206 |
| 文件页数： | 2/14页 |
| 文件大小： | 291K |
| 代理商： | 12062R824K7B20G |
2001 May 30 Rev.3
10
www.phycomp-components.com
Phycomp
Product specification
Surface-mount ceramic
multilayer capacitors
Class 2, X7R 16/25/50 V
feedthrough
HIGH FREQUENCY BEHAVIOUR OF MULTILAYER CHIP CAPACITORS
Multilayer chip capacitors (MLCCs) are suitable for use at
high frequencies. At frequencies below the series
resonance frequency, the MLCC can be represented by an
equivalent circuit as shown in Fig.9.
In general, the quantities C, ESR and L are frequency
dependent. For most applications, C and L can be
regarded as frequency independent below 1 GHz.
The equivalent series self-inductance L is:
Independent of the dielectric material.
Dependent on the size of the capacitor, it increases with
increasing length and decreases with increasing width
or thickness of the product.
The value of L is approximately:
– 0.6 nH for case size 0603
– 1 nH for case sizes 0805, 1206 and 1210
– 1.5 nH for case sizes 1812 and 2220.
These figures are accurate to within 20%.
Because of the inductance L, associated with the MLCC,
there will be a frequency at which the inductive reactance
will be equal to the reactance of the capacitor.
This is known as the series resonance frequency (SRF)
and is given by:
At the SRF, the MLCC will appear as a small resistor.
The transmission loss through the MLCC at this series
resonance frequency will be low.
Using the values of C, L = 1 nH and the ESR at a specific
frequency (f), two often used quantities can be derived.
The impedance (Z) is given by:
The quality factor (Q) is given by:
SRF
1
2
π LC
-------------------
=
Z
1
2
πf
()2
–
LC
2j
πfC
------------------------------------
ESR
+
=
Q
12
πf )2LC
(
–
2
πfESRC
--------------------------------------
=
Fig.9 Equivalent series representation of an MLCC.
C = capacitance.
ESR = equivalent series resistance which is determined by the
energy dissipation mechanisms (in the dielectric material as well
as in the electrodes).
L = equivalent series self-inductance.
MEA609
C
ESR
L
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