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This concept can be applied to ESD protection of integrated circuits. Capacitor “C1” represents the ESD source such as a person’s charged body, while capacitor “C2” represents the MLCC ESD protection capacitor. When the ESD pulse enters the device through a connector, the MLCC will be in parallel with the ESD source capacitance and share the same charge between them. Since the MLCC capacitance will be higher than the ESD source capacitance, the resulting voltage “Vic” across the integrated circuit will be much lower than the ESD pulse. As the capacitance of the MLCC increases, the voltage across the integrated circuit will decrease further providing protection against ESD.
PTM Published on: 2018-03-01