VEMI255A-HS3_09 VISHAY [Vishay Siliconix], VEMI255A-HS3_09 Datasheet - Page 2

• Manufacturer Part Number: VEMI255A-HS3_09
• Description: 2-Channel EMI-Filter with ESD-Protection
• Manufacturer: VISHAY [Vishay Siliconix]

VEMI255A-HS3
Vishay Semiconductors
APPLICATION NOTE
With the VEMI255A-HS3 2 different signal or data lines can be filtered and clamped to ground. Due to the different clamping levels
in forward and reverse direction the clamping behavior is Bidirectional and Asymmetric (BiAs).
The 2 independent EMI-filter are placed between
pin 1 and pin 6, and
pin 3 and pin 4.
They all are connected to the common ground pin 2. Pin 5 is internally not connected. Each filter is symmetrical so that all ports
(pin 1, 3, 4, and 6) can be used as input or output.
The circuit diagram of one EMI-filter-channel shows two identical Z-diodes at the input to ground and the output to ground. These
Z-diodes are characterized by the breakthrough voltage level (V
voltage level the Z-diodes can be considered as capacitors. Together with these capacitors and the line resistance R
input and output the device works as a low pass filter. Low frequency signals (f < f
(f > f
Each filter is symmetrical so that both ports can be used as input or output.
www.vishay.com
2
19500
3dB
) will be shorted to ground through the diode capacitances C
L1
L2
IN
IN
1
2
3
21085
(pin 1, 3)
For technical questions, contact:
In
C
C
2-Channel EMI-Filter with
D
D
6
5
4
ESD-Protection
(pin 2)
GND
R
S
L1
BR
L2
OUT
OUT
) and the diode capacitance (C
D
[e-mail]
.
C
3dB
D
(pin 4, 6)
Out
) pass the filter while high frequency signals
19420
19421
D
). Below the breakthrough
Document Number: 84772
Rev. 1.7, 14-Sep-09
S
between