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AN574 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN574
Description  TRANSIL TRISIL COMPARISON
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN574 Datasheet(HTML) 3 Page - STMicroelectronics

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2.4. Power dissipation
The dissipated power in both the Transil and the
Trisil is due to the presence of voltage across
and current through the protection device.
Note
that
for
the
same
package,
the
current-handling capability of a Transil depends
on the breakdown voltage, whereas this is not
the case for a Trisil.
For example, with the CB429 package we have
the Transil series 1.5 KE and the Trisil family
TPB which have different behaviour in terms of
current suppression.
As shown in table 1 the current rating of TPB
devices is always 100 A whatever the VBR value,
while it depends on the VBR for the 1.5KE series.
Current capability for 1ms wave
10V
62V
150V
220V
Transil
1.5KE
103A
17.7A
7.2A
4.6A
Trisil
TPB
100A
100A
100A
Table 1 : Current capabilities of Transil 1.5KE
and Trisil TPB
Tables 2 and 3 summarize the different
behaviour and advantages of both Transil
and Trisil devices. It is not possible to say
"Transils are better than Trisils" or the
opposite, only that their application areas
are different. SGS-THOMSON produces
both types of devices meeting the widest
protection requirements range.
3. SUMMARY
TRANSIL
TRISIL
TYPE OF ACTION
CLAMPING
CROWBAR
ELECTRICAL
CHARACTERISTICS
SCHEMATICS
ELECTRICAL
BEHAVIOUR
ACTION START
Vsurge > VBR
Vsurge > VBO
ACTION STOP
Vsurge < VBR
I < Holding Current
Table 2 : Transil/Trisil Summary
I
V
-V
BR
V
BR
OR
V
CL
I
V
-V
BO
V
BO
GATE
OR
V
BO
TRANSIL
TRISIL
No short - circuit
across low - impedance
lines , eg - power - supply.
Greater power handling
due to lower voltage
across terminals.
No need to ensure
device switch - off after
transient subsides.
Available
with
program-
mable breakover voltage.
Table 3 : Transil/Trisil distinctive advantages
®
APPLICATION NOTE
3/4


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