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SRDA05-4R2 Fiches technique(PDF) 4 Page - ON Semiconductor

No de pièce SRDA05-4R2
Description  Low Capacitance Surface Mount TVS for High−Speed Data Interfaces
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SRDA05-4R2 Fiches technique(HTML) 4 Page - ON Semiconductor

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SRDA05−4R2
http://onsemi.com
4
APPLICATIONS INFORMATION
The SRDA05−4R2 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 SRDA05−4R2 offers surge rated, low
capacitance steering diodes and a TVS diode integrated in a
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.
SRDA05−4R2 Configuration Options
The SRDA05−4R2 is able to protect up to four data lines
against transient overvoltage conditions by driving them to
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 Vcc+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
Protection of four data lines and the power supply using
Vcc as reference.
8
7
6
5
1
2
3
4
I/O 1
I/O 2
I/O 3
I/O 4
VCC
For this configuration, connect pins 2 & 3 directly to the
positive supply rail (Vcc). 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.
Option 2
Protection of four data lines with bias and power supply
isolation resistor.
8
7
6
5
1
2
3
4
I/O 1
I/O 2
I/O 3
I/O 4
VCC
10 K
The SRDA05−4R2 can be isolated from the power supply
by connecting a series resistor between pins 2 & 3 and Vcc.
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.
8
7
6
5
1
2
3
4
I/O 1
I/O 2
I/O 3
I/O 4
NC
NC
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
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 + VTVS).
ESD Protection of Power Supply Lines
When using diodes for data line protection, referencing to
a supply rail provides advantages. Biasing the diodes
reduces their capacitance and minimizes signal distortion.
Implementing this topology with discrete devices does have
disadvantages. This configuration is shown below:


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