Murata has announced an air pump measuring 20x20x1.85mm, without its nozzle.
"The MZB1001 micro-blower is believed to be the smallest air pump in the market," said the firm.
Inside, a piezoelectric diaphragm vibrates up and down when a sine wave voltage is applied.
The vibrations force air into the blower and out through a nozzle on the top.
Airflow up to 0.8 litres per minute is available, and air pressure up to 1.5kPa, when driven by a 15Vp-p 25kHz signal.
"The piezoelectric diaphragm has been optimized for operation above the normal audible range and is typically driven by a 24 to 25kHz signal," said the firm.
Power consumption is typically 0.2W.
Intended applications are aromatic atomizers, air fresheners and similar household smell products.