
OPTOISO 1KV TRANS W/BASE TO-78-6
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The 4N24A, manufactured by MICROPACK, is a hermetically sealed, NPN silicon phototransistor optocoupler housed in a TO-78-6 package. It provides 1 kV of electrical isolation between the input and output circuits. The input consists of a gallium arsenide (GaAs) infrared-emitting diode (IRED), optically coupled to an NPN silicon phototransistor with a base connection. The base connection allows for external biasing to control gain and switching speed. Key parameters include a typical collector-emitter saturation voltage (VCE(sat)) of less than 0.5V at a specified collector current (IC) and input forward current (IF). The device is designed for applications requiring high isolation, such as signal isolation in industrial control systems, logic interfaces, and power supply circuits. The TO-78 package provides robust mechanical and environmental protection.