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Description
This device has been especially designed to
protect 2 new high voltage, as well as classical
SLICs, against transient overvoltages.
Positive overvoltages are clamped by 2 diodes.
Negative surges are suppressed by 2 thyristors,
their breakdown voltage being referenced to -V
BAT
through the gate.
This component presents a very low gate
triggering current (I
GT
) in order to reduce the
current consumption on printed circuit board
during the firing phase.
Functional diagram
TIP 1
1
8
RING 1
GATE
2
7
GND
GATE
3
6
GND
Benefits
Trisils are not subject to ageing and provide a fail
safe mode in short circuit for a better protection.
Trisils are used to help equipment to meet various
standards such as UL1950, IEC950 / CSA C22.2,
UL1459 and FCC part68. Trisils have UL94 V0
resin approved (Trisils are UL497B approved (file:
E136224)).
TIP 2
4
5
RING 2
February 2006
www.st.com
Rev 3
1/11
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