The 2SC3940A is a silicon NPN epitaxial planar transistor manufactured by Panasonic. It is specifically designed for use in high-frequency amplification applications, particularly in VHF and UHF bands. This transistor offers a combination of high gain and low noise characteristics, making it well-suited for sensitive receiver circuits.

Applications:

• High-frequency amplifiers (VHF/UHF)
• Low-noise amplifiers (LNAs)
• Oscillators
• Mixers
• RF front-end circuits

Features:

• NPN Silicon Epitaxial Planar Transistor
• High Gain (hFE) at high frequencies
• Low Noise Figure (NF)
• High Transition Frequency (fT)
• Small signal amplification

Benefits:

• Enhanced signal reception: Low noise figure ensures minimal added noise to the amplified signal, improving clarity and range.
• Efficient amplification: High gain allows for robust signal amplification, even with weak input signals.
• Optimized for high frequencies: Designed for VHF and UHF bands, ensuring reliable performance in demanding RF applications.
• Improved circuit performance: Enables the creation of highly sensitive and efficient RF circuits.
• Versatile usage: Suitable for various applications in communication and signal processing systems.

Specifications:

The 2SC3940A has a collector-emitter voltage (VCEO) of 20V, a collector current (IC) of 50mA, and a power dissipation (PC) of 0.2W. It typically features a low noise figure (NF) of around 1.2 dB and a high transition frequency (fT) of 7 GHz. The current gain (hFE) typically ranges from 60 to 240. The transistor is typically available in a small surface-mount package, such as SOT-23, making it suitable for compact electronic devices. It operates reliably within a temperature range of -55°C to +150°C.