Intersil's ISL54230 octal switch is designed to provide ESD protection when interconnect baseband chip, application processor, internal SIM cards and other support chips in smartphones.

The ISL54230 has eight individual Single Pole Double Throw (SPDT) switches which pass a wide range of precision voice and data signals, including high-speed USB, UART, PCM, audio and power.

With the addition of simple logic control, the switches can be configured to multiplex between pairs of signals like USB 2.0 high-speed ports, or between groups of signals like SIM card clock, data and power lines. 

For dual-mode handsets, the device allows dual baseband chips to access either of two SIM cards while allowing the unused SIM card to be powered down in order to minimise battery drain. All signal lines have greater than 8kV ESD protection allowing for much safer SIM card insertion and removal.