The **2SC4774G-AL3-R** is a specific NPN Silicon Epitaxial Planar Transistor. It is primarily designed for high-frequency amplification and switching applications. Below is a detailed breakdown of its electronic characteristics and technical specifications. --- ### ## 1. Technical Specifications The following table summarizes the key absolute maximum ratings and electrical characteristics for the 2SC4774G-AL3-R. | Parameter | Symbol | Maximum Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 60 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 50 | V | | Emitter-Base Voltage | $V_{EBO}$ | 7 | V | | Collector Current | $I_C$ | 150 | mA | | Power Dissipation | $P_D$ | 150 | mW | | Junction Temperature | $T_j$ | 150 | °C | | Transition Frequency | $f_T$ | 180 (Typ) | MHz | --- ### ## 2. Key Features and Characteristics * **Small Package:** It is typically housed in a small surface-mount package (often SOT-23 or SOT-323/SC-70 depending on the manufacturer’s specific suffix), making it ideal for high-density PCB designs. * **Low Capacitance:** The output capacitance ($C_{ob}$) is typically low (around 2.0 pF to 3.5 pF), which allows for efficient operation in high-frequency circuits. * **High DC Current Gain ($h_{FE}$):** It provides stable amplification performance, usually ranging from 120 to 560 (categorized by ranks like Q, R, or S). * **Complementary Pair:** The PNP complement to this transistor is often the **2SA1774**. --- ### ## 3. Common Applications Due to its high frequency response and low current profile, this part is commonly used in: 1. **Signal Amplification:** Low-noise pre-amplifiers for audio and radio frequencies. 2. **Switching:** Logic level switching in consumer electronics (phones, tablets, and laptops). 3. **Oscillators:** Used in local oscillator circuits for RF communication. --- ### ## 4. Part Number Decoding The suffixing on parts like these often denotes specific manufacturing details: * **2SC4774:** The base model number. * **G:** Often indicates a "Green" (Halogen-free/RoHS compliant) component. * **AL3:** Typically refers to the package type (e.g., SOT-323). * **R:** Usually refers to the tape and reel packaging or the specific $h_{FE}$ gain rank. ---