TDK’s T3902 PDM microphone is an ultra-low-power and low noise MEMS microphone for mobile, IoT, and other consumer devices, housed in a small 3.5 x 2.63 x 0.98-mm package.
source http://www.electronicproducts.com/Sensors_and_Transducers/Transducers/TDK_claims_lowest_power_PDM_microphone.aspx
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