### Technical Overview of 2SC3803-R The **2SC3803-R** is a high-voltage NPN epitaxial silicon transistor. It is primarily designed for high-definition color TV chroma output circuits and high-voltage switching applications. --- ### 1. Key Technical Specifications The "R" suffix typically denotes the **hFE (DC Current Gain)** classification, ensuring the gain falls within a specific range for circuit stability. | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 300 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 300 | V | | Emitter-Base Voltage | $V_{EBO}$ | 7.0 | V | | Collector Current (DC) | $I_C$ | 100 | mA | | Total Power Dissipation | $P_C$ | 900 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ### 2. Physical Characteristics The device is usually housed in a **TO-92MOD** (or similar long-body TO-92) package to allow for better heat dissipation compared to standard small-signal transistors. #### Pin Configuration 1. **Emitter (E):** Current exit point. 2. **Collector (C):** Connected to the higher voltage/load. 3. **Base (B):** The control terminal. --- ### 3. Features and Applications #### Features * **High Breakdown Voltage:** With a $V_{CEO}$ of 300V, it is safe for high-voltage rail operations. * **Low Output Capacitance:** Typically around 3.0 pF ($C_{ob}$), which is critical for high-frequency performance in video circuits. * **Excellent Linearity:** Provides consistent gain across a range of collector currents. #### Common Applications * **Chroma Output:** Driving the color signals in CRT (Cathode Ray Tube) displays. * **Video Amplifiers:** Used in the final stages of video processing where high voltage swings are required. * **High-Voltage Switching:** Small-load switching in industrial control circuits. --- ### 4. Complementary Pair In push-pull or symmetrical amplifier designs, the 2SC3803 (NPN) is often paired with its PNP counterpart: * **Complementary Part:** **2SA1477**