HI1-549-2

The HI1-549-2 from HAR is a single 4-channel CMOS analog multiplexer designed with active overvoltage protection. This feature ensures that analog input levels can greatly exceed either power supply without damaging the device or disturbing other channels. The device can withstand constant 70Vp-p levels with ±15V supplies, and digital inputs can tolerate faults up to 4V greater than either supply. Signal sources are protected from short-circuiting during multiplexer supply loss, with each input presenting 1kΩ resistance under such conditions.

Fabricated with 44V Dielectrically Isolated CMOS technology, the HI1-549-2 is suitable for applications where analog inputs originate from external equipment or separately powered circuitry. Key electrical specifications include a typical access time of 500ns and a typical standby power of 7.5mW. The device is available in a SOIC package and is designed for surface mount applications.

This analog multiplexer is ideal for use in data acquisition systems, industrial controls, and telemetry applications where robust input protection and signal integrity are critical. Its ability to maintain signal fidelity under fault conditions makes it a reliable choice for demanding environments.