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SL15T1G Datasheet(PDF) 4 Page - ON Semiconductor

Part # SL15T1G
Description  Capacitance TVS
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SL15T1G Datasheet(HTML) 4 Page - ON Semiconductor

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SL05T1G Series
www.onsemi.com
4
Applications Background
This family of TVS devices (SL05T1 series) are designed
to protect sensitive electronics such as communications
systems, computers, and computer peripherals against
damage due to ESD conditions or transient voltage
conditions. Because of their low capacitance value (less than
5 pF), they can be used in high speed I/O data lines. Low
capacitance is achieved by integrating a compensating diode
in series with the TVS which is basically based in the below
theoretical principle:
Capacitance in parallel: CT = C1+C2+....+Cn
Capacitance in series: 1/CT = (1/C1)+(1/C2)+....+(1/Cn)
The Figure 5 shows the integrated solution of the SL05T1
series device:
Figure 5.
COMPENSATING
DIODE
TVS
In the case that an over−voltage condition occurs in the I/O
line protected by the SL05T1 series device, the TVS is
reversed−biased
while
the
compensation
diode
is
forward−biased so the resulting current due to the transient
voltage is drained to ground.
If protection in both polarities is required, an additional
device is connected in inverse−parallel with reference to the
first one, the Figure 6 illustrates the inverse−parallel
connection for bi−directional or unidirectional lines:
Figure 6.
3
2
1
3
2
1
An alternative solution to protect unidirectional lines, is to
connect a fast switching steering diode in parallel with the
SL05T1 series device. When the steering diode is
forward−biased, the TVS will avalanche and conduct in
reverse direction. It is important to note that by adding a
steering diode, the effective capacitance in the circuit will be
increased, therefore the impact of adding a steering diode
must be taken in consideration to establish whether the
incremental capacitance will affect the circuit functionality
or not. The Figure 7 shows the connection between the
steering diode and the SL05T1 series device:
Figure 7.
STEERING DIODE
SL05T1 DEVICE
Another typical application in which the SL05T1 series
device can be utilized, is to protect multiple I/O lines. The
protection in each of the I/O lines is achieved by connecting
two devices in inverse−parallel. The Figure 8 illustrates how
multiple I/O line protection is achieved:
Figure 8.
OUTPUT
INPUT
For optimizing the protection, it is recommended to use ground planes and short path lengths to minimize the PCB’s ground inductance.


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