The **2SC2411-R** is a NPN epitaxial planar silicon transistor designed primarily for general-purpose switching and amplification applications. It is frequently used in consumer electronics due to its high reliability and standardized characteristics. --- ### 1. Key Technical Specifications The following table outlines the absolute maximum ratings and electrical characteristics for the 2SC2411-R: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 40 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 32 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 5 | V | | **Collector Current (DC)** | $I_C$ | 500 | mA | | **Power Dissipation** | $P_D$ | 200 - 300 | mW | | **DC Current Gain** | $h_{FE}$ | 180 to 390 | (R Grade) | | **Transition Frequency** | $f_T$ | 250 (Typ) | MHz | --- ### 2. The "R" Classification The suffix **"R"** refers to the **hFE (Current Gain) classification**. Transistors in the 2SC2411 series are categorized into different groups based on their gain range: * **Q:** 120 to 270 * **R:** 180 to 390 * **S:** 270 to 560 The "R" grade ensures a balanced gain suitable for both signal amplification and driving small loads. --- ### 3. Physical Packaging and Pinout The 2SC2411-R is typically found in the **SOT-23 (SST3)** surface-mount package, making it ideal for compact PCB designs. | Pin Number | Terminal Name | Function | | :--- | :--- | :--- | | 1 | **Emitter** | Current exit point | | 2 | **Base** | Controls the transistor (Gate) | | 3 | **Collector** | Current entry point | --- ### 4. Typical Applications Because of its 500mA current capacity (relatively high for a small-signal transistor) and 250MHz frequency, it is used in: 1. **Switching:** Driving LEDs, small relays, or buzzers. 2. **AF Amplification:** Pre-amplifier stages in audio equipment. 3. **Digital Logic:** Interfacing between low-power ICs and larger loads. --- ### 5. Equivalent/Complementary Parts * **Complementary PNP:** 2SA1036 (The PNP version used for push-pull circuits). * **Equivalent Substitutes:** BC817, MMBT2222A (Note: Check pinout configurations as they may vary).