The 2SC4115SR is a silicon NPN epitaxial planar transistor manufactured by Rohm Semiconductor. It is designed for high-frequency amplification and switching applications, especially in VHF and UHF circuits. Its low noise figure and high gain make it suitable for use in RF amplifiers, oscillators, and mixers.

Applications:

• RF Amplifiers: Used in radio frequency (RF) amplifiers.
• Oscillators: Employed in oscillator circuits for generating high-frequency signals.
• Mixers: Found in mixer circuits for frequency conversion.
• VHF/UHF Circuits: Designed for very high frequency (VHF) and ultra-high frequency (UHF) applications.
• Communication Equipment: Used in communication equipment such as radios and transceivers.

Features:

• NPN Transistor: An NPN transistor designed for high-frequency applications.
• High Transition Frequency (fT): Features a high transition frequency for excellent high-frequency performance.
• Low Noise Figure: Offers a low noise figure for sensitive receiver applications.
• High Gain: Provides high gain for signal amplification.
• Surface Mount Package: Available in a small surface mount package for compact designs.
• RoHS Compliant: Complies with RoHS environmental standards.

Benefits:

• Excellent High-Frequency Performance: Provides excellent performance in VHF and UHF circuits.
• Low Noise: Minimizes noise in sensitive receiver applications.
• Compact Design: Allows for compact circuit designs due to its small package size.
• Easy to Use: Simple to integrate into existing circuits.
• Cost-Effective: Provides a cost-effective solution for high-frequency amplification and switching.

The 2SC4115SR's specifications include a collector-emitter voltage (VCEO) typically around 20V, a collector current (IC) of approximately 50mA, and a transition frequency (fT) of several GHz. The transistor offers a typical noise figure of around 1 dB at a specified frequency, making it suitable for low-noise amplifier applications. The operating junction temperature ranges from -55°C to +150°C. The device is typically available in a SOT-23 or similar surface-mount package. Its high transition frequency, low noise figure, and high gain make it an excellent choice for designers seeking reliable and efficient high-frequency performance.