The TXS02326 is a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wireless baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. It is a custom device which is used to extend a single SIM/UICC interface to be able to support two SIMs/UICCs. The integrated LDO accepts input battery voltages from 2.3 V to 5.5 V and outputs up to 50 mA to the side B circuitry and to external Class-B or Class-C SIM cards.