TISP6NTP2B

The TISP6NTP2B has an array of four buffered P-gate forward conducting thyristors with twin commoned gates and a common anode connection. Each thyristor cathode has a separate terminal connection. An antiparallel anode-cathode diode is connected across each thyristor. The buffer transistors  reduce the gate supply current.

In use, the cathodes of an TISP6NTP2B thyristors are connected to the four conductors to be protected (see Figure 2 and Figure 3). Each gate is connected to the appropriate negative voltage feed. The anode of the TISP6NTP2B is connected to the system common. The TISP6NTP2B is in an 8-pin small-outline surface mount package.

Positive overvoltages are clipped to common by forward conduction of the TISP6NTP2B antiparallel diode. In Figure 2, a negative overvoltage draws a current through the 6.8 Ω resistor and the voltage developed triggers the thyristor on. In Figure 3, negative overvoltages are initially clipped close to the negative supply by emitter follower action of the TISP6NTP2B buffer transistor. If sufficient clipping current flows, the TISP6NTP2B thyristor will regenerate and switch into a low voltage on-state condition. As the negative overvoltage subsides, the high holding current of the TISP6NTP2B prevents d.c. latchup.