The **2SD130-R** is a specific variant of the 2SD130 NPN Silicon Epitaxial Planar Transistor. It is primarily designed for low-frequency power amplification and general-purpose switching applications. The suffix **"R"** typically denotes the **DC Current Gain (hFE) classification**, indicating a specific range of efficiency for that batch. --- ### 1. Key Technical Specifications Below are the typical absolute maximum ratings and characteristics for the 2SD130 series: | Parameter | Symbol | Value | Unit | |:---|:---|:---|:---| | Collector-Base Voltage | $V_{CBO}$ | 30 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 25 | V | | Emitter-Base Voltage | $V_{EBO}$ | 5 | V | | Collector Current (DC) | $I_C$ | 0.5 | A | | Collector Power Dissipation | $P_C$ | 600 | mW | | Junction Temperature | $T_j$ | 150 | °C | ### 2. The "R" Gain Classification Transistors are often sorted into "bins" based on their gain. For the 2SD130, the classifications are generally: * **O (Orange):** 70 – 140 * **Y (Yellow):** 120 – 240 * **G (Green):** 200 – 400 * **R (Red/Specific):** Often refers to a gain range around **40 – 80** or a specific manufacturer-defined high-reliability range (Check the specific datasheet of the manufacturer like Sanyo or Savant, as "R" can vary between 40-180 depending on the brand). --- ### 3. Pinout Configuration The 2SD130 usually comes in a **TO-92** small plastic package. Looking at the flat side with leads pointing down: 1. **Emitter (E)** 2. **Base (B)** 3. **Collector (C)** --- ### 4. Common Applications * **Audio Preamplifiers:** Used in the initial stages of audio signal processing due to its stable gain. * **Switching:** Acting as an electronic switch for small loads (LEDs, small relays). * **Driver Stages:** Driving larger power transistors in more complex circuits. ### 5. Equivalent/Substitute Parts If you cannot find a 2SD130-R, these common NPN transistors can often serve as replacements (though you must verify pinout and gain): * **BC547 / BC548** (General purpose, lower current) * **2N2222** (Higher current capability) * **2SC1815** (Very common Japanese NPN alternative)