SN74LVC1G3157 SPDT Analog Switch Texas Instruments SN74LVC1G3157 SPDT Analog Switch is a single channel single-pole-double-throw (SPDT) analog switch designed for 1.65V to 5.5V VCC operation. The SN74LVC1G3157 device can handle both analog and digital signals. The SN74LVC1G3157 device permits signal with amplitudes of up to VCC (peak) to be transmitted in either direction. Typical applications include signal gating, chopping, modulation or demodulation (modem), and signal multiplexing for analog-to-digital and digital-to-analog conversion systems.