AN320

Trisil characteristics

Doc ID 5649 Rev 3

5/13

1.3

Limiting property

Because of its operating mode, the Trisil results in absolute voltage limitation, independently

of the surge current level, Figure 6 and of the slope of the applied voltage ramp (see

Figure 7).

Figure 6.

Correlation between the voltage and the surge current

Figure 7.

Correlation between the limiting voltage and the surge voltage ramp

In particular, if the surge current is higher than the guaranteed value in the catalogue,

without however exceeding the physical limits of the component, the voltage across a Transil

could reach the critical value destroying the equipment to be protected. For a Trisil, this risk

is excluded.

Finally, for a surge current much higher than the guaranteed value, destruction of the Trisil

always results in a short-circuit thus providing absolute protection for the equipment located

downstream.

0

0

A - Transil

B - Trisil

V

0

dV/dt

Voltage across

the Trisil