The CM1683 is an L-C EMI filter array with ESD protection, which integrates two Pi-filters (C-L-C) for the headset speaker. The CM1683 has component values of 100pF-3nH-100pF. The parts include ESD protection diodes on all input and output pins, which provide a very high level of protection for sensitive electronic components that may be subjected to electrostatic discharge (ESD).