## Overview of the 2SC5358-R The **2SC5358-R** is a high-power NPN epitaxial silicon transistor. It is primarily designed for high-fidelity (Hi-Fi) audio power amplifiers and general-purpose power amplification stages. The "R" suffix typically denotes a specific **hFE (DC Current Gain)** classification range. --- ### Technical Specifications | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 230 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 230 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 5 | V | | **Collector Current (DC)** | $I_C$ | 15 | A | | **Base Current** | $I_B$ | 1.5 | A | | **Collector Power Dissipation** | $P_C$ | 150 | W | | **Junction Temperature** | $T_j$ | 150 | °C | --- ### Key Features and Characteristics 1. **High Voltage Handling:** With a $V_{CEO}$ of 230V, it is suitable for high-voltage rails in professional audio equipment. 2. **High Linearity:** It offers excellent linearity of forward current transfer ratio ($h_{FE}$), which minimizes harmonic distortion in audio applications. 3. **Complementary Pair:** It is designed to work in tandem with the **2SA1986** (PNP) or **2SA1943** (depending on the specific manufacturer series) for push-pull amplifier configurations. 4. **HFE Classification (R-Rank):** * The "R" rank usually indicates a DC current gain ($h_{FE}$) range between **55 to 110**. --- ### Typical Pin Configuration The device is generally housed in a **TO-3P** or **TO-264** package. Looking at the front (labeled side) with pins pointing down: | Pin Number | Function | | :--- | :--- | | 1 | **Base** | | 2 | **Collector** (Connected to the cooling tab) | | 3 | **Emitter** | --- ### Common Applications * **Audio Power Amplifiers:** Used in the output stage of high-power amplifiers (100W+). * **Voltage Regulators:** Employed in high-voltage series regulator circuits. * **Motor Control:** Used in industrial drivers requiring high current and voltage. --- ### Example Schematic Context When used in a Class AB power amplifier, the 2SC5358-R acts as the NPN side of the output stage: ```text [Positive Rail +Vcc] | [2SC5358-R] <-- NPN (Top Side) | [Output] ----> To Speaker | [2SA1986] <-- PNP (Bottom Side) | [Negative Rail -Vee] ```