The 2SC945L is a low noise NPN silicon transistor manufactured by UTC (Unisonic Technologies Co., Ltd.). It is designed for use in a wide range of general-purpose amplification and switching applications. Known for its low noise characteristics, it is particularly well-suited for audio preamplifiers and sensitive receiver circuits.

Applications

• Audio preamplifiers
• Low-noise amplifier stages
• General-purpose amplification
• Switching circuits
• Signal processing circuits

Features

• Low noise figure
• High current gain (hFE)
• High transition frequency (fT)
• Small signal amplification
• NPN silicon transistor
• Pb-free lead plating

Benefits

• Improved audio quality: The low noise figure ensures minimal added noise in audio amplification stages, resulting in cleaner and clearer sound.
• Enhanced signal sensitivity: The high current gain amplifies weak signals effectively, improving the sensitivity of receiver circuits.
• Versatile application: Suitable for various amplification and switching tasks due to its robust performance characteristics.
• Compact design: Its small size allows for easy integration into compact electronic devices.
• Environmentally friendly: Pb-free lead plating complies with environmental standards.

Additional Details

The 2SC945L typically comes in a TO-92 package. Key electrical characteristics include a collector-emitter voltage (VCEO) of around 50V, a collector current (IC) of approximately 150mA, and a power dissipation of about 250mW. The typical noise figure is around 4dB. The current gain (hFE) ranges widely, usually from 200 to 700, categorized by different rank markings (e.g., L, M, H). For detailed specifications including temperature ratings, saturation voltages, and frequency response, refer to the UTC datasheet.