The AQY214EH is a DIP4-pin PhotoMOS relay featuring reinforced insulation rated at 5,000 Vrms with more than 0.4 mm internal insulation distance between inputs and outputs, conforming to EN41003 and EN60950 standards. This device is designed to control low-level analog signals with extremely low closed-circuit offset voltage and high sensitivity, capable of handling a maximum continuous load current of 0.12 A at 400 V peak AC load voltage with only 5 mA input current. The relay exhibits low on-resistance of 52 O (typical) to 120 O (maximum) and minimal off-state leakage current of 1 µA maximum, with an operating temperature range of -40°C to +85°C. Typical applications include modem and telephone equipment, industrial plant control, security systems, and sensing equipment where galvanic isolation and low-level signal switching are required.