SGM4157YC6, SGMICRO Single-Pole Double-Throw (SPDT) Analog Switch with Ultra-Low On-Resistance

2.1 2-to-1 Multiplexing for Analog Signals

It features one common terminal (COM) together with two signal paths (NO/NC). The MCU applies high or low logic level to the IN control pin to switch signals between the two channels. It is applicable to analog audio signals, sensor signals and low-power power supply switching.

2.2 Low-Loss Transmission with Undistorted Signals

It achieves ultra-low on-resistance of only 0.8Ω. Voltage drop and signal distortion are negligible for audio and weak analog signals, making it ideal for audio circuits of earphones, loudspeakers and microphones.

2.3 Break-Before-Make Structure to Prevent Short-Circuit Damage

The device disconnects the active channel before connecting the alternative path during switching. This avoids direct short-circuit between two signal lines and protects rear power amplifiers and sensor ICs from burnout.

III. Main Applications

1. Audio Equipment (Primary Recommended Application by Manufacturer)

• Smartphones & feature phones: switching between earpiece and loudspeaker, microphone channel switching, ringtone channel switching

• TWS earbuds, smart watches & smart bands: noise reduction microphone path switching, speaker switching

• MP3 players, voice recorders & portable speakers: audio input and output channel switching

2. Battery-Powered Portable IoT Devices

• Multi-channel signal selection for temperature/humidity, gas and infrared sensors

• Analog signal switching for wireless remote controllers, barcode scanners and portable detectors

• Signal switching for smart door locks and wireless alarm systems