MAX4505EUK+T

The MAX4505EUK+T is a single signal-line protector designed by Analog Devices / Maxim Integrated. It features fault-protected input and Rail-to-Rail signal handling capabilities. The input is protected from overvoltage faults up to ±36V when power is on, and ±40V when power is off. During a fault condition, the input terminal becomes an open circuit, allowing only nanoamperes of leakage current to flow from the source.

This device protects both unipolar and bipolar analog signals using unipolar (+9V to +36V) or bipolar (±8V to ±18V) power supplies. It has no logic control inputs, meaning the protector is always active when the supplies are on. The MAX4505EUK+T offers a maximum on-resistance of 100Ω and an on-leakage of less than 0.5nA at +25°C. It is available in a compact 5-pin SOT-23 package.

Applications for the MAX4505EUK+T include process control systems, hot-insertion boards/systems, data-acquisition systems, redundant/backup systems, ATE equipment, and sensitive instruments. It ensures an unambiguous rail-to-rail output when a fault begins and ends, and features a 10ns overvoltage turn-on delay without latchup during power sequencing.