The AKU151 has a volume of 5.4mm3 and an SNR of 65dB. This, says Akustica, is almost twice the acoustic performance density (SNR/mm3) of any other top port MEMS microphone. Consuming 60µA during standard operation, the part is said to be suited to applications such as wearables.
Meanwhile, the AKU350 is of metal lid construction and offers sensitivity matching of ±1dB. Occupying a volume of 9.1mm3, the AKU350 is targeted at smartphone manufacturers who use multiple microphones with noise cancellation algorithms.