phototriac

The IL410 and IL4108 consists of a GaAs IRLED optically
coupled to a photosensitive zero crossing TRIAC network.
The TRIAC consists of two inverse parallel connected
monolithic SCRs. These three semiconductors are
assembled in a six pin dual in-line package.
High input sensitivity is achieved by using an emitter
follower phototransistor and a cascaded SCR predriver
resulting in an LED trigger current of less than 2 mA (DC).
The use of a proprietary dV/dt clamp results in a static dV/dt
of greater than 10 kV/ms. This clamp circuit has a MOSFET
that is enhanced when high dV/dt spikes occur between
MT1 and MT2 of the TRIAC. When conducting, the FET
clamps the base of the phototransistor, disabling the first
stage SCR predriver.
The zero cross line voltage