Approval sheet
Page 2 of 7 ASC_RFCMF1220100M4T_V10 Jun. 2012
FEATURES
1. Multilayer LTCC ( Low Temperature Cofired Ceramics ) Technology
2. Reflow solderable SMD Devices
3. Miniatured Size 1.2 x 2.0 x 1.0 mm
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4. Low Differential Mode Insertion Loss maximum 1.0 dB @ 240MHz
5. High Common Mode attenuation minimum 9.0dB @ 130MHz ~ 1.0GHz
6. Special 3D layout design to minimize phase shifting
APPLICATIONS
1. USB 2.0/ IEEE 1394 high speed data transmission
2. PC related, DSC, Scanner, Data Storage Devices, CD ROM R/W, Printer
CONSTRUCTION and Schematic
Fig 1. Outline of 1220 size Common Mode Filter and Schematics
DESCRIPTION
Walsin Technology Corporation develops a new ceramic Common Mode Filter specified for the EMI suppression on USB
2.0/ IEEE 1394 high speed data transmission, as shown in fig-1.
The new specification, USB 2.0 released in April
2000, describes a high-speed of 480 Mbps. The major goal is to replace most of the traditional ports on a PC
with one versatile and user-friendly interface. IEEE-1394 has a bus speed of 400 Mbps, and IEEE-1394b
proposes to increase this rate to 3.2 Gbps. Under such a high speed,
to suppress the serious EMI is a key issue for
developer. The Common Mode Filter offered by Walsin Technology Corporation has been designed to a high suppression
on Common Mode Noise as well as low insertion loss characteristics on Differential Mode Signal through Walsin’s
advanced LTCC (Low Temperature Co-fired Ceramic) technology and superior product design via 3D EM Simulation Skill.
This Common Mode Filter has a rectangular ceramic body with a tiny dimension of 1.2 x 2.0 x 1.0 mm
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future meet the SMT
automation and miniaturization requirements on modern devices.
DIMENSIONS
Figure Symbol Dimension
L
1.20 + 0.40/ -0.20 mm
W
2.00 + 0.40/ -0.20 mm
T
1.00 ± 0.20 mm
P
0.80 ± 0.10 mm
a
0.45 ± 0.20 mm
b
0.40 ± 0.20 mm
