## Overview of the 2SC5198-R The **2SC5198-R** is a high-power NPN epitaxial silicon transistor. It is primarily designed for use in high-fidelity (Hi-Fi) audio amplifiers and general-purpose power amplification. The suffix **"R"** refers to the specific DC Current Gain ($h_{FE}$) classification, indicating a range between **55 and 110**. --- ### Key Technical Specifications | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 140 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 140 | V | | Emitter-Base Voltage | $V_{EBO}$ | 5 | V | | Collector Current (DC) | $I_C$ | 10 | A | | Base Current | $I_B$ | 1 | A | | Collector Power Dissipation | $P_C$ | 100 | W | | Junction Temperature | $T_j$ | 150 | °C | --- ### Features and Characteristics * **High Voltage Rating:** With a $V_{CEO}$ of 140V, it is suitable for high-voltage power supplies found in large amplifiers. * **High Linearity:** It offers excellent linearity of $h_{FE}$ (gain), which is crucial for reducing distortion in audio signals. * **Complementary Pair:** It is often paired with the **2SA1941** (PNP transistor) for push-pull output stages. * **Package Type:** Usually comes in a **TO-3P** or **TO-247** package, which allows for efficient heat dissipation when mounted to a heatsink. --- ### Common Applications 1. **Audio Power Amplifiers:** Used in the output stage of 60W to 100W Hi-Fi amplifiers. 2. **Voltage Regulators:** Employed in linear power supply circuits requiring high current handling. 3. **DC-to-DC Converters:** Used as a switching or pass element in power conversion. --- ### Pin Configuration (TO-3P) Looking at the front of the transistor (labels facing you): 1. **Base (B):** Left Pin 2. **Collector (C):** Middle Pin (also connected to the metal tab) 3. **Emitter (E):** Right Pin ---