VEMI45AA-HNH Vishay, VEMI45AA-HNH Datasheet - Page 2

• Manufacturer Part Number: VEMI45AA-HNH
• Description: 4-channel Emi-filter With Esd-protection
• Manufacturer: Vishay

VEMI45AA-HNH
Vishay Semiconductors
Application Note:
With the VEMI45AA-HNH 4 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 behaviour is Bidirectional and
Asymmetric (BiAs).
The 4 independent EMI-filter are placed between
They all are connected to a common ground pin 9 on the backside of the package.
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
capacitance (C
Together with these capacitors and the line resistance R
pass filter. Low frequency signals (f < f
to ground through the diode capacitances C
Each filter is symmetrical so that both ports can be used as input or output.
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2
L1
L2
L3
L4
IN
IN
IN
IN
D
). Below the breakthrough voltage level the Z-diodes can be considered as capacitors.
pin 1 and pin 8,
pin 2 and pin 7,
pin 3 and pin 6 and
pin 4 and pin 5.
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(Pin 1, 2, 3, 4)
20385
1
2
3
4
In
3dB
C
D
9
) pass the filter while high frequency signals (f > f
8
7
6
5
D
.
(Pin 9)
GND
R
S
S
between input and output the device works as a low
L1
L2
L4
L3
OUT
OUT
OUT
OUT
(Pin 5, 6, 7, 8)
C
D
Out
20384
Document Number 81385
BR
3dB
) and the diode
Rev. 1.3, 26-Feb-08
) will be shorted