R-IN32M4-CL3 User's Manual: Board design edition
6. Gigabit Ethernet PHY Pins
R18UZ0074EJ0100
Page 14 of 61
Dec 24, 2019
6.1.2
Recommended Components
(1) Ceramic capacitors
We recommend using components that satisfy the following conditions.
Capacitors: 47
F, 10
F, and 0.1
F
Thermal characteristic: X5R or X7R
ESR: No more than 0.1 Ω (from 100 kHz to 100 MHz)
Table 6.1 Example of Recommended Components of Ceramic Capacitors
Manufacturer
Part Number
Capacitance
TDK
C32165R1C476M1160AB
47
F
TDK
C2012X5R1C106K085AC
10
F
(2) Ferrite beads
We recommend using components that satisfy the following conditions.
Impedance: At least 80 Ω (at 100 MHz)
Use beads with a
high impedance in which the resistive component is dominant.
Rated current: At least 2 A
DC resistance: No more than 50 mΩ
Figure 6.2 Example of Recommended Impedance Characteristics with Frequency of Ferrite Beads
Table 6.2 Example of Recommended Components of Ferrite Beads
Manufacturer
Part Number
Impedance
Rated Current
DC Resistance
muRata
BLM18PG121SN1
120
Ω ± 25%
2 A
50
mΩ
muRata
BLM21PG121SN1
120
Ω ± 25%
3 A
30
mΩ