ZTX451L is a 30V Low Noise NPN Bipolar Transistor from Plessey Semiconductor. It can be used for a wide range of applications, such as in linear amplifiers, audio frequency amplifiers, and switching applications. The ZTX451L comes in a TO-92 package, offering good heat dissipation and long-term reliability, along with a high gain-bandwidth product. The device can operate at supplying current of up to 0.2A with a voltage range of up to 30V. It also has a low VCE(sat) of 0.1V at 0.2A, making it ideal for low noise applications. The device also has a good gain of up to 75 at 10V and 100mA.