The Bourns 3314J-1-101E is a surface mount single turn trimmer resistor. It has a 4mm square body size, and is made with a 20% tolerance. These trimmer resistors are used to adjust resistance within a circuit, allowing for changes in performance and output. They can be adjusted manually with a small precision screwdriver. This component is a great choice for fine-tuning a system, making it ideal for applications where exact adjustments of parameters are required.