The Fujitsu MBF110 Solid-State Fingerprint Sensor is a direct contact, fingerprint acquisition device. It is a high performance, low power, low cost, capacitive sensor with an integrated twodimensional array of metal electrodes in the sensing array. Each metal electrode acts as one plate of a capacitor and the contacting finger acts as the second plate. A passivation layer on the device surface forms the dielectric between these two plates. Ridges and valleys on the finger yield varying capacitor values across the array, which is read to form an image of the fingerprint.