The CJE3139K is a high-quality Bipolar Junction Transistor (BJT) manufactured by JSCJ (JCET). As an NPN transistor, it's commonly used for amplification and switching applications in a wide range of electronic devices. Its SOT-23 package provides a small footprint, making it suitable for designs where board space is limited. Supreme Components International is an authorized distributor of JSCJ (JCET) components, ensuring you receive genuine and reliable parts. This transistor is a versatile component for both hobbyists and professional engineers. Trust Supreme Components International for all your electronic component needs.