AQY221N2V1W is an RF PhotoMOS relay featuring an ultra-miniature SSOP 4-pin package with low output capacitance (C type) designed for high-speed switching applications. This device offers an output capacitance of 1.0 pF typical, ON resistance of 9.5O typical, and fast switching times with turn on and turn off times of 0.02 ms. It supports a load voltage of 40V and continuous load current of 120 mA, with I/O isolation voltage rated at 1,500V AC. The relay operates over a temperature range of -40°C to +85°C and features a 60% reduction in lower surface area compared to conventional 4-pin SOP types. Common applications include test equipment such as IC testers, board testers, medical equipment like ultrasonic diagnostic machines, and multi-point recorders.