Ultra-Small Dual Single Pole, Single Throw Analog Switch with Over Voltage Tolerance The NLAS4157 is a low RON SPDT analog switch. This device is designed for low operating voltage, high current switching of speaker output for cell phone applications. It can switch a balanced stereo output. The NLAS4157 can handle a balanced microphone/speaker/ringtone generator in a monophone mode. The device contains a break−before−make (BBM) feature