
November 2007
Rev 5
1/9
9
TPI
Tripolar protection for ISDN interfaces
Features
■
Bidirectional triple crowbar protection
■
Peak pulse current:
I
PP
= 30 A , 10/1000 μs
■
Breakdown voltage:
– TPI80N: 80 V
– TPI120N: 120 V
■
Available in SO-8 package
■
Low dynamic breakover voltage:
– TPI8011N: 120 V
– TPI12011N: 170 V
Benefits
■
Low capacitance from lines to ground, allowing
high speed transmission without signal
attenuation
■
Good capacitance balance between lines to
ensure longitudinal balance
■
Fixed breakdown voltage in both common and
differential modes
■
The same surge current capability in both
common and differential modes
■
A particular attention has been given to the
internal wire bonding. The “4-point”
configuration ensures a reliable protection,
eliminating overvoltages introduced by the
parasitic inductances of the wiring (Ld
I
/dt),
especially for very fast transient overvoltages
TM: Trisil is a trademark of STMicroelectronics
Complies with following standards
■
CCITT K17-K20
– 10/700 μs, 1.5 kV
– 5/310 μs, 38 A
■
VDE 0433
– 10/700 μs, 2 kV
– 5/310 μs, 50 A
■
VDE 0878
– 1.2/50 μs, 1.5 kV
– 1/20 μs, 40 A
■
IEC 61000-4-2 level 4
– 0.5/700 μs, 1.5 kV
– 0.2/310 μs, 38 A
Description
Dedicated devices for
ISDN
interface and high
speed data telecom line protection. Equivalent to
a triple Trisil with low capacitance.
Figure 1.
Functional diagram
SO-8
Tip
GND
GND
Ring
Tip
GND
GND
Ring
1
2
3
4
5
6
7
8
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