The **2SC2714-R** is a high-frequency NPN epitaxial silicon transistor designed primarily for use in the VHF (Very High Frequency) and UHF (Ultra High Frequency) bands. It is commonly found in communication devices, such as radio tuners and oscillators. ### 1. General Specifications The "R" suffix typically refers to the **hFE (DC Current Gain)** classification, which determines how much the transistor amplifies the input current. | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 40 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 30 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 4 | V | | **Collector Current** | $I_C$ | 20 | mA | | **Transition Frequency** | $f_T$ | 550 (Typ.) | MHz | | **Collector Capacitance** | $C_{ob}$ | 0.9 | pF | | **hFE Classification (R)** | $h_{FE}$ | 90 to 180 | - | --- ### 2. Key Features and Applications * **Low Noise Figure:** It provides a clear signal with minimal added electronic noise, making it ideal for the input stages of receivers. * **High Frequency Performance:** With a transition frequency ($f_T$) of 550 MHz, it is highly effective for FM radio, TV tuners, and wireless communication modules. * **Small Form Factor:** Usually comes in a **SOT-23 (SSMT)** package, suitable for high-density surface-mount PCB designs. ### 3. Pinout Configuration The 2SC2714 follows the standard SOT-23 pinout: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **Base** | Controls the current flow between Collector and Emitter. | | 2 | **Emitter** | The outlet for the current. | | 3 | **Collector** | The inlet for the current. | --- ### 4. Circuit Implementation Example Below is a simple representation of how the transistor might be biased in a common-emitter amplifier configuration: ```c Vcc (+V) | [Rc] (Collector Resistor) | +------- Output | [C] / Input --| [B] (2SC2714-R) \ [E] | [Re] (Emitter Resistor) | GND ``` ---