The 2N4870 is a PNP bipolar junction transistor (BJT) in a TO-5 package, designed for use in switching and amplifier applications. It has a maximum collector-base voltage of -60V and a maximum collector current of -0.1A. The transistor has a low noise figure and high current gains, making it suitable for low-power amplification circuits. It also has a low saturation voltage, which ensures efficient switching performance. The 2N4870 is housed in a hermetically sealed metal case, providing protection against environmental factors. Overall, this discrete semiconductor component is reliable, versatile, and efficient for a variety of electronic applications