SIEMENS 2N2904

Number of Pins: Indicates the number of electrical connections available on the component. These pins are used to connect the component to other components or circuits on a printed circuit board (PCB). The number of pins determines the functionality and connectivity options of the component. It is important to ensure that the component has the correct number of pins for the intended application.

Polarity refers to the direction of current flow through an electronic component. It is typically indicated by a plus (+) or minus (-) sign on the component's body. Components with polarity must be connected correctly in a circuit to function properly. For example, a diode will only allow current to flow in one direction, from the positive terminal to the negative terminal. If a diode is connected backwards, it will not conduct current.

Power Dissipation is the maximum amount of power that an electronic component can safely dissipate without being damaged. It is typically measured in watts (W) and is determined by the component's physical size, material properties, and design. Exceeding the power dissipation rating can lead to overheating, reduced performance, and even component failure.

Collector Base Voltage (VCBO) is a parameter that specifies the maximum voltage that can be applied between the collector and base terminals of a transistor when the emitter terminal is open. It is a measure of the transistor's ability to withstand high voltages without breaking down. A high VCBO rating indicates that the transistor can handle large voltage swings without being damaged.