The **2SC5097-R** is a NPN epitaxial silicon transistor specifically designed for low-noise, high-gain amplification in high-frequency applications, particularly in the Radio Frequency (RF) spectrum. --- ### 1. Key Technical Specifications The "R" suffix typically refers to the **DC Current Gain ($h_{FE}$)** classification, ensuring a specific range of performance. | Parameter | Symbol | Rating / Value | | :--- | :--- | :--- | | **Type** | - | NPN | | **Package** | - | S-Mini (SOT-323 / SC-70) | | **Collector-Emitter Voltage** | $V_{CEO}$ | 10 V | | **Collector Current** | $I_C$ | 50 mA | | **Transition Frequency** | $f_T$ | 10 GHz (Typical) | | **Noise Figure** | $NF$ | 1.1 dB (at 2 GHz) | | **Power Dissipation** | $P_C$ | 150 mW | --- ### 2. Physical Pinout The 2SC5097-R usually comes in a small surface-mount package. The pin configuration is as follows: 1. **Base (B)**: Input control terminal. 2. **Emitter (E)**: Ground/Common terminal. 3. **Collector (C)**: Output terminal. --- ### 3. Application Areas Due to its high transition frequency ($f_T$) and low noise characteristics, it is primarily used in: * **VHF/UHF Amplifiers**: Low-noise amplifiers (LNA) for radio receivers. * **Oscillators**: Local oscillators in cellular or cordless phones. * **Communication Equipment**: Pagers, satellite tuners, and wireless LAN modules. --- ### 4. Circuit Implementation Example Below is a basic representation of how the NPN transistor is biased in a common-emitter configuration for RF amplification. ```cpp // Basic Biasing Representation Vcc (3V - 5V) | [Rc] <-- Collector Resistor |---------- Output (Capacitor coupled) | [2SC5097-R] | \ | [Base] <-- Input (Capacitor coupled) + Bias Resistors | [Emitter] | GND ``` --- ### 5. Important Considerations * **Heat Sensitivity**: As an S-mini package device, it is sensitive to soldering heat. Manual soldering should be done quickly. * **ESD Protection**: High-frequency transistors often have very thin junction layers; always use anti-static measures (ESD wrist straps) when handling. * **Impedance Matching**: To achieve the rated 1.1 dB noise figure, the input and output networks must be precisely matched to 50 ohms at the operating frequency.