C4532X7T2W474K230KE Datasheet, PDF (45/64 Pages) TDK Electronics – TDK MLCC PRODUCT LINE

44
CER SERIES | Controlled ESR / X5R
Capacitance
(pF)
1,000,000
10,000,000
22,000,000
Cap
Code
105
106
226
CERB
0603/C1608
0G (4V)
2C
2M
3U
(200mΩ) (650mΩ) (1.2Ω)
X5R
1C
(20mΩ)
CERD
0805/C2012
0G (4V)
1J
2A
2C
2J
(50mΩ) (100mΩ) (200mΩ) (500mΩ)
Additional Product Application Information
 Excessively low ESR with traditional MLCC may negatively affect decoupling at the CPU level
which is powered by high current and low voltage. Several capacitors with different self-
resonant frequency are used at power circuit of CPU to make impedance lower at wide band
and to control voltage fluctuation toward high frequency current. However, excessively lower
ESR of MLCC may cause sharp impedance peak by parallel resonance between MLCCs, high
frequency current which corresponds to the frequency will change PS voltage and cause
malfunction. CPU decoupling MLCC with appropriate ESR will obtain flat impedance and
control CPU voltage fluctuation.
 CERB (0603) series capacitor has maximum resistance of 1200mΩ and the
CERD (0805) series capacitor has maximum resistance of 500m Ω, ideal for
using as decoupling capacitors.
Parasitic oscillation
due to too low ESR.
Stable by optimizing ESR
value.
 Optimal ESR Value selection can prevent parasitic oscillation and secure phase margin
©TDK Corporation of America – Contents are subject to change without notice.