The IL440 consists of a GaAs infrared emitter optically coupled to a silicon planar triac chip with a nonzero crossing network. The two semiconductors are assembled in a 6 pin dual-in-line plastic package. The output detector IL440-1, 2, 3 is capable of blocking up to 600 volts which permits control of off-line voltages up to 240 VAC. The IL440 can handle currents up to 100 mA RMS.