MPSA42 KSP42 NPN Transistor, TO-92

The MPSA42 (also known as KSP42) is a high-voltage NPN transistor designed primarily for switching applications rather than amplification. While transistors can generally function as either switches or amplifiers, the MPSA42’s characteristics make it especially well suited to reliably switching high-voltage loads.

It can switch loads with voltages up to 300V, and when fully biased with a base-emitter voltage of around 6V, it can carry a collector current of up to 500mA. This combination of high voltage tolerance and decent current handling makes it a strong choice for switching applications where higher voltage rails are involved.

• Transistor type – High voltage NPN
• DC current gain (hFE) – 40
• Continuous collector current – 500mA
• Base-Emitter voltage – 6V
• Collector-Emitter voltage – 300V
• Collector-Base voltage – 300V
• Package – TO-92

If your project needs to switch relatively high voltages while still handling a respectable current, the MPSA42 offers a reliable and compact solution. The MPSA42 / KSP42 NPN Transistor is a solid pick for high-voltage switching circuits, relay drivers and similar applications.