| 摘要 |
A current sensor that is compact can detect with high sensitivity and high accuracy a magnetic field generated by a current. The current sensor has a thin film coil including turn portions extending in an X-axis direction at a second layer, and a first magnetoresistive element which includes element patterns disposed at a first layer in areas corresponding to the turn portions, the resistance value of which varies according to a magnetic field generated by a current detected of from 10 to 50 mA flowing through the turn portions. The distance between each turn portion and each element pattern is from 0.4 to 1.0 mum. Each cross-sectional area at the turn portions is from 0.4 to 3.0 mum<SUP>2</SUP>. This permits efficient detection of a magnetic field without the influence of heat generated from the thin film coil.
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