### Technical Overview: 2SC3235 Transistor The **2SC3235** is a high-voltage NPN Silicon Epitaxial Transistor primarily designed for high-speed switching and power amplifier applications. It is frequently utilized in television circuitry, specifically for video output stages and high-frequency amplification. --- ### 1. General Specifications Below are the key electrical characteristics and absolute maximum ratings: | Parameter | Symbol | Rating | Unit | |:---|:---|:---|:---| | Collector-Base Voltage | $V_{CBO}$ | 400 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 400 | V | | Emitter-Base Voltage | $V_{EBO}$ | 7.0 | V | | Collector Current (DC) | $I_C$ | 0.2 | A | | Collector Power Dissipation | $P_C$ | 900 | mW | | Junction Temperature | $T_j$ | 150 | °C | --- ### 2. Key Features * **High Voltage:** Capable of handling up to 400V, making it suitable for applications connected to rectified mains or high-voltage signals. * **Low Capacitance:** Small output capacitance ($C_{ob}$), which is critical for maintaining signal integrity at high frequencies. * **Complementary Pair:** Often paired with the **2SA1285** (PNP) for push-pull circuit designs. * **Package Type:** Usually found in a **TO-92L** or **TO-92MOD** package, which allows for better heat dissipation than a standard TO-92. --- ### 3. Pin Configuration When looking at the flat side of the transistor with the leads pointing down: 1. **Emitter (E):** The source of charge carriers. 2. **Collector (C):** Connected to the higher voltage/load. 3. **Base (B):** The trigger that controls current flow between C and E. --- ### 4. Common Applications * **Video Output Stages:** Used in CRT monitors and television sets to drive the electron guns. * **High-Voltage Switching:** Suitable for small-signal high-voltage switching power supplies. * **Signal Amplification:** Used in professional audio equipment or instrumentation where high voltage swings are required. --- ### 5. Equivalent/Replacement Parts If the 2SC3235 is unavailable, the following transistors are often considered as alternatives (verify pinouts before replacing): * **2SC3467** * **KSC2330** * **BF422** (General high voltage NPN)