| 摘要 |
An IC card capable of reinforcing the prevention of the electrostatic damage without causing a rise in the cost of a semiconductor integrated circuit chip. The semiconductor integrated circuit chip ( 2 ) is mounted on a card substrate ( 1 ), and plural connection terminals ( 3 ) are exposed. The connection terminals are connected to predetermined external terminals ( 4 ) of the semiconductor integrated circuit chip, first overvoltage protection elements ( 7, 8, 9 ) connected to the external terminals are integrated in the semiconductor integrated circuit chip, and second overvoltage protection elements such as surface-mount type varistors ( 11 ) connected to the connection terminals are mounted on the card substrate. The varistors are variable resistor elements having a current tolerating ability greater than that of the first overvoltage protection elements. The varistors have been selected by taking into consideration a relationship between the characteristics and the ability of the first overvoltage protection elements contained in the semiconductor integrated circuit chip, and exhibit the effect for preventing the electrostatic damage. |
