STMicroelectronics, represented in Australia by Braemac , has worked with major appliance makers to develop a family of ac line switches protected against over-voltages.
They are designed to control small pumps, fans, valves, relays, dispensers, door locks and micro-motors in appliances such as dishwashers, air-conditioners, washing machines, dryers, refrigerators, freezers, ovens and other vending machines.
The ACS family of switches is built with ST's proprietary ASD process technology, which means the switches can integrate high-voltage protection circuitry that meets the requirements of the latest home-appliance energy-saving and EMC standard, IEC61000-4-5.
The switches also have high gate sensitivity, enabling them to be directly driven by micro-controllers and ensuring low power consumption.
The high blocking voltage (up to 500V) and clamping voltage (up to 1100V) of the new ACS devices means they can withstand the back-EMF created by inductive loads running from 240V mains voltages.
And the switches also have a high noise immunity of 500V/µs, enabling the equipment to meet the transient burst immunity requirements of the IEC61000-4-4 standard.
The recently introduced ACS products are available in single-switch versions (ACS110-7S and ACS120-7S) or in three-switch arrays (ACS302-5T3).
The maximum current per switch is 2A. The parts help users cut costs by saving PCB space and cutting component counts, due to their direct gate drive and snubberless configuration.