The **2SC5548** is a high-speed, high-voltage NPN Silicon epitaxial transistor. It is primarily designed for high-resolution color display horizontal deflection output applications. --- ### ## 1. Key Specifications Below are the absolute maximum ratings and typical electrical characteristics (at $T_a = 25^\circ C$ unless otherwise specified): | Parameter | Symbol | Rating/Value | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 1500 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 600 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 5 | V | | **Collector Current (DC)** | $I_C$ | 10 | A | | **Collector Current (Pulse)** | $I_{CP}$ | 20 | A | | **Total Power Dissipation** | $P_C$ | 50 ($T_C = 25^\circ C$) | W | | **DC Current Gain** | $h_{FE}$ | 5 to 25 | - | --- ### ## 2. Physical Characteristics and Pinout The 2SC5548 usually comes in a **TO-3PF** or similar isolated plastic package. This packaging is beneficial because it provides high-voltage insulation between the internal semiconductor and the heatsink. **Pin Configuration (Front View):** 1. **Base (B):** Input signal control. 2. **Collector (C):** Connected to the load (High Voltage). 3. **Emitter (E):** Connected to ground. --- ### ## 3. Notable Features * **High Breakdown Voltage:** Capable of handling up to 1500V (collector-base), making it suitable for CRT monitors and TV sets. * **High Speed:** Optimized for fast switching, which is necessary for horizontal scanning frequencies. * **Built-in Damper Diode:** Some variations of deflection transistors include a damper diode; however, the standard 2SC5548 often requires an external one unless specifically noted in the manufacturer’s variant. * **Low Saturation Voltage:** Reduces power loss during the "on" state. --- ### ## 4. Applications The device is specialized for power switching circuits, specifically: * **Horizontal Deflection Output:** In high-resolution CRT monitors and televisions. * **Switching Regulators:** High-voltage DC/DC converters. * **General High-Voltage Switching:** Industrial equipment requiring high $V_{CEO}$.