Infrared sensor IC is a kind of with fairly good performance of the sensor signal processing integrated circuits. It matchs with pyroelectric infrared sensors and a few external components constitute a passive pyroelectric infrared switch. Can automatically rapid opening all kinds of incandescent lamp, fluorescent lamp, buzzer, automatic, electric fan, dryer and automatic device such as wash one's hands, especially suitable for enterprises, hotels, stores, warehouse and family of corridor and other sensitive area, or for safe area of automatic lighting, lighting and alarm systems.