The silk screen DSG and ESG are two common chip triode models that represent different polarity and power levels. DSG is PNP-polar and is suitable for smaller power applications, such as low-voltage, low-current amplification circuits. ESG is NPN polar and is suitable for larger power applications, such as high-voltage, high-current amplification circuits. These two kinds of chip triode have the characteristics of high frequency response, low noise and stability, and are widely used in electronic components.