The **2SC3419** is a Silicon NPN Power Transistor primarily designed for low-frequency power amplification and high-speed switching applications. Below is a detailed technical breakdown of this electronic component. --- ## 1. Device Overview The 2SC3419 is often utilized in driver stages of audio amplifiers and in switching power supplies. It is characterized by high current capacity and high speed. ### General Specifications | Parameter | Description | | :--- | :--- | | **Polarity** | NPN | | **Package Type** | TO-126 (Standard) | | **Material** | Silicon (Si) | | **Application** | Power Amp, Switching | --- ## 2. Absolute Maximum Ratings ($T_a = 25^\circ C$) Exceeding these values may cause permanent damage to the component. | Symbol | Parameter | Value | Unit | | :--- | :--- | :--- | :--- | | $V_{CBO}$ | Collector-Base Voltage | 40 | V | | $V_{CEO}$ | Collector-Emitter Voltage | 40 | V | | $V_{EBO}$ | Emitter-Base Voltage | 5 | V | | $I_C$ | Collector Current (DC) | 1.5 | A | | $I_{CP}$ | Collector Current (Pulse) | 3.0 | A | | $P_C$ | Collector Power Dissipation | 1.25 | W | | $T_j$ | Junction Temperature | 150 | $^\circ C$ | --- ## 3. Electrical Characteristics These values define how the transistor performs under specific operating conditions. * **DC Current Gain ($h_{FE}$):** Typically ranges from 40 to 320 (classified into ranks like R, O, Y). * **Collector-Emitter Saturation Voltage ($V_{CE(sat)}$):** Maximum of 0.5V at $I_C = 1A$, indicating efficient switching. * **Transition Frequency ($f_T$):** Approximately 100 MHz, making it suitable for high-speed response. --- ## 4. Pin Configuration (TO-126) When looking at the branded side of the transistor with the leads pointing downwards: 1. **Emitter (E):** Usually the left pin. 2. **Collector (C):** The middle pin. 3. **Base (B):** The right pin. --- ## 5. Typical Applications * **Audio Amplifiers:** Used in the driver stage to provide enough current to the final output power transistors. * **DC-DC Converters:** Acts as a switch to control power flow. * **Relay Drivers:** Due to its 1.5A current rating, it can easily drive mechanical relays or small DC motors. ---