Transistor 2SD642 Toshiba The 2SD642 transistor is an NPN power transistor manufactured by Toshiba and designed for industrial and commercial electronic applications. This transistor is widely used in power circuits and amplifiers due to its high power characteristics and TO-3 resistant package. Technical specifications: - **Transistor type**: NPN - **Package**: TO-3 (metal with high heat dissipation capacity) - **Collector-emitter voltage (Vce)**: 100 volts - **Maximum collector current (Ic)**: 3 amps - **Dissipative power (Pd)**: 30 watts - **direct current efficiency (hFE)**: 40 to 320 depending on the model - **low thermal resistance**: heat dissipation and increase the life of the transistor Applications: 1. **Power amplifiers**: in audio and electronic amplifiers for better power and stability. 2. **power switching circuits**: use in circuits that require high power switching. 3. **Switching power supplies**: suitable for use in power supplies due to high voltage and current tolerance. 4. **Motor control**: As a driver of DC motors in industrial applications. This transistor is supplied in a **TO-3** package and includes mounting hardware specifically designed for power applications. Due to its high power characteristics and high voltage and current tolerance, this transistor is considered a suitable option for power and industrial circuits.