1. 4N25 is an optocoupler phototransistor manufactured by Toshiba.
2. The 4N25 is a single-channel device with a 6-pin DIP footprint, suitable for a variety of applications, including input and output isolation, AC/DC coupling, signal level shifting, and power management.
3. It operates with a wide range of power supply voltages, is available in several speed options (for example, the SHORT.F type operates at 1 MHz), and works with input voltages of up to 30V, making it a very versatile device.
4. The 4N25 also incorporates several safety features designed to maximize its performance in high voltage and high temperature environments, such as its maximum operating temperature of 85 C. The device also has a built-in photo-diode which limits the amount of current going into the device, as well as phototransistor which provides its superior performance.