Relay
1. The 2N2638 is a solid state relay manufactured by NXP Semiconductors. It is a single-pole, single-throw (SPST) relay with an optically-isolated MOSFET output.
2. It is designed for use in industrial control applications such as motor drives, weighing, position control, and process control systems. Its features include short-circuit protection, over voltage protection, and high dielectric strength. It is available in a wide range of package types, including a standard DIP or SMT form factor. The relay operates from 4-32V DC input, with a maximum switching current of 1A.