ITAXXB3_07 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ITAXXB3_07' PDF : 8 Pages View PDF
Application information
2
Application information
ITAxxB3
This monolithic Transil Array is based on 610 unidirectional Transils with a common cathode
and can be configurated to offer up to 9 bidirectional functions. This imposes a maximum
differential voltage between 2 input pins (see Table 3).
Table 3. Maximum differential voltages
Order code
Maximum differential voltage between two input pins at 25°C
ITA6V5B3
ITA18B3
ITA25B3
± 3.5 v
± 9.0 v
± 12.5 v
Figure 8. RS-232 junction (typical application)
TX
RX
RTS
CTS
DTR
DSR
CARRIER DET.
AUX
GND
2.1
Design advantage of ITAxxB3 used with 4-point structure
The ITAxxxB3 has been designed with a 4-point structure Figure 9. The 4 point structure
(separated Input/output) to efficiently protect against
disturbances with very high di/dt rates, such as ESD.
Chip
The purpose of this 4-point structure is to eliminate the
overvoltage introduced by the parasitic inductances of the
wiring (Ldi/dt).
Efficient protection depends not only on the component
itself, but also on the circuit layout. The drawing given in
Input 1
di/dt
GND
GND
Output 1
BE
U DEPVRICOETTEOCTED
figure 9 shows the layout to be used in order to take
advantage of the 4-point structure of the ITAxxxB3.
With this layout, each line to be protected passes through
the protection device.
In this way, it realizes an interface between the data line
and the circuit to be protected, guaranteeing an isolation
between its inputs and outputs.
4/8
Share Link: 
