The LTV-817 is a high-performance phototransistor optocoupler designed for efficient signal transmission with electrical isolation. This package includes 50 pieces of LTV-817 ICs in a compact DIP-4 through-hole package, making it ideal for engineers, students, and electronics hobbyists working on a wide range of applications. The LTV-817 integrates an infrared LED and a phototransistor inside a single package, allowing signals to be transferred optically while maintaining complete electrical isolation between the input and output. This isolation is essential for protecting low-voltage control circuits from high-voltage transients, electrical noise, and interference. With its high isolation voltage and excellent noise immunity, the LTV-817 is widely used in switching power supplies, signal isolation circuits, microcontroller interfaces, and industrial control systems. It helps ensure stable system operation and improves overall reliability in demanding environments. The DIP-4 package provides a compact footprint and is easy to install on breadboards and printed circuit boards. Its through-hole design ensures strong and stable connections, making it suitable for prototyping, testing, and long-term use in electronic products.