## 2SC2412K-R: General Purpose NPN Transistor The **2SC2412K-R** is a widely used, high-performance NPN silicon epitaxial planar transistor. It is specifically designed for general-purpose switching and amplification applications in compact electronic circuits. --- ### 1. Key Technical Specifications The "R" suffix in the part number indicates the **DC Current Gain (hFE)** classification, typically ranging between 180 and 390. | 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 | $P_D$ | 200 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ### 2. Physical Characteristics The 2SC2412K-R is housed in a **SMT (Surface Mount Technology)** package, which makes it ideal for automated assembly. * **Package Type:** SOT-23 (also known as SMD3). * **Marking Code:** Usually marked with the letters **BR**. * **Complementary Part:** The PNP equivalent is the **2SA1037K**. --- ### 3. Key Features * **Low Collector Saturation Voltage:** Typically $V_{CE(sat)} = 0.4V$ (max) at $I_C = 50mA$, ensuring efficient switching with minimal power loss. * **High Reliability:** Built using epitaxial planar technology for stable performance over time. * **Compact Form Factor:** Small footprint allows for high-density mounting on Printed Circuit Boards (PCBs). --- ### 4. Common Applications This transistor is versatile and found in various consumer and industrial electronics: 1. **Signal Amplification:** Used in low-noise pre-amplifier stages. 2. **Switching:** Acting as a digital switch to control small loads (LEDs, relays). 3. **Interface Circuits:** Level shifting between different voltage domains in logic circuits. ---