The **2SA1415-R** is a high-frequency, high-voltage Silicon PNP Epitaxial Planar Transistor. It is primarily designed for high-definition CRT display video output and high-voltage switching applications. --- ## 1. Key Specifications Below are the typical electrical characteristics and maximum ratings for the 2SA1415-R: | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-to-Base Voltage | $V_{CBO}$ | -120 | V | | Collector-to-Emitter Voltage | $V_{CEO}$ | -120 | V | | Emitter-to-Base Voltage | $V_{EBO}$ | -5 | V | | Collector Current (DC) | $I_C$ | -100 | mA | | Total Device Dissipation | $P_D$ | 800 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ## 2. Technical Features The "R" suffix in the part number usually refers to the **hFE (DC Current Gain) classification**. For this specific series, "R" typically denotes a gain range between **100 and 200**. ### Core Attributes: * **High Breakdown Voltage:** With a $V_{CEO}$ of -120V, it can safely handle high-voltage swings common in video circuitry. * **High Frequency Response:** It possesses a high transition frequency ($f_T$), usually around **120 MHz**, making it suitable for fast-switching video signals. * **Low Capacitance:** Low output capacitance ($C_{ob}$) ensures minimal signal distortion at high frequencies. * **Complementary Pair:** It is often paired with the **2SC3645** (NPN version) for push-pull amplifier stages. --- ## 3. Pin Configuration The 2SA1415 is commonly found in the **TO-92MOD** (or similar small plastic) package. The standard pinout (facing the flat side with leads pointing down) is: 1. **Emitter (E)** 2. **Collector (C)** 3. **Base (B)** --- ## 4. Typical Applications * **Video Output:** Used in the final stages of high-resolution monitors and TV sets. * **High-Voltage Switching:** Suitable for circuits requiring low current but high voltage tolerance. * **Audio Drivers:** Occasionally used in the driver stages of high-fidelity audio amplifiers.