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SRDA3.3 ? 4
APPLICATIONS INFORMATION
The SRDA3.3 ? 4 is a low capacitance TVS diode array
designed to protect sensitive electronics such as
communications systems, computers, and computer
peripherals against damage due to ESD events or transient
overvoltage conditions. Because of its low capacitance, it
can be used in high speed I/O data lines. The integrated
design of the SRDA3.3 ? 4 offers surge rated, low
Option 2
Protection of four data lines with bias and power supply
isolation resistor.
I/O 1
I/O 2
V CC
capacitance steering diodes and a TVS diode integrated in a
1
8
single package (SO ? 8). If a transient condition occurs, the
steering diodes will drive the transient to the positive rail of
the power supply or to ground. The TVS device protects the
power line against overvoltage conditions avoiding damage
to the power supply and other downstream components.
SRDA3.3 ? 4 Configuration Options
The SRDA3.3 ? 4 is able to protect up to four data lines
against transient overvoltage conditions by driving them to
10 K
I/O 3
I/O 4
2
3
4
Figure 4.
7
6
5
a fixed reference point for clamping purposes. The steering
diodes will be forward biased whenever the voltage on the
protected line exceeds the reference voltage (Vf or
V CC + Vf). The diodes will force the transient current to
bypass the sensitive circuit.
Data lines are connected at pins 1, 4, 6 and 7. The negative
reference is connected at pins 5 and 8. These pins must be
connected directly to ground using a ground plane to
minimize the PCB’s ground inductance. It is very important
to reduce the PCB trace lengths as much as possible to
minimize parasitic inductances.
Option 1
The SRDA3.3 ? 4 can be isolated from the power supply by
connecting a series resistor between pins 2 and 3 and V CC .
A 10 k W resistor is recommended for this application. This
will maintain a bias on the internal TVS and steering diodes,
reducing their capacitance.
Option 3
Protection of four data lines using the internal TVS diode
as reference.
I/O 1
I/O 2
Protection of four data lines and the power supply using
V CC as reference.
I/O 1
I/O 2
1
8
I/O 3
NC
NC
1
2
3
4
8
7
6
5
V CC
2
3
7
6
I/O 4
Figure 5.
I/O 3
I/O 4
4
5
In applications lacking a positive supply reference or
those cases in which a fully isolated power supply is
required, the internal TVS can be used as the reference. For
these applications, pins 2 and 3 are not connected. In this
Figure 3.
For this configuration, connect pins 2 and 3 directly to the
configuration, the steering diodes will conduct whenever the
voltage on the protected line exceeds the working voltage of
the TVS plus one diode drop (Vc=Vf + V TVS ).
positive supply rail (V CC ). The data lines are referenced to
the supply voltage. The internal TVS diode prevents
overvoltage on the supply rail. Biasing of the steering diodes
reduces their capacitance.
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