vemi85aa-hgk Vishay, vemi85aa-hgk Datasheet - Page 2

• Manufacturer Part Number: vemi85aa-hgk
• Description: 8-channel Emi-filter With Esd-protection
• Manufacturer: Vishay

VEMI85AA-HGK
Vishay Semiconductors
Application Note:
With the VEMI85AA-HGK 8 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 8 independent EMI-Filter are placed between
They all are connected to a common ground pin 17 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
L2
L1
L3
L4
L5
L8
L6
L7
IN
IN
IN
IN
IN
IN
IN
IN
D
). Below the breakthrough voltage level the Z-diodes can be considered as capacitors.
pin 1 and pin 16,
pin 2 and pin 15,
pin 3 and pin 14,
pin 4 and pin 13,
pin 5 and pin 12,
pin 6 and pin 11,
pin 7 and pin 10 and
pin 8 and pin 9.
(Pin 1, 2, 3, 4, 5, 6, 7, 8)
20390
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8
1
2
3
4
5
6
7
In
C
3dB
D
17
) pass the filter while high frequency signals (f > f
16
15
14
13
12
11
10
9
D
.
(Pin 17)
GND
R
S
S
between input and output the device works as a low
L1
L2
L3
L4
L5
L6
L7
L8
(Pin 9, 10, 11, 12, 13, 14, 15, 16)
C
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
D
Out
Document Number 81386
3dB
BR
20389
Rev. 1.3, 26-Feb-08
) and the diode
) will be shorted