The **CXT853** is a high-current NPN silicon epitaxial planar transistor designed for applications requiring high gain and low saturation voltage. It is typically manufactured by **Central Semiconductor Corp** and comes in an **SOT-89** surface-mount package. --- ## 1. Key Specifications and Ratings The following table summarizes the absolute maximum ratings and electrical characteristics for the CXT853. | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Collector-Base Voltage | $V_{CBO}$ | 150 | V | | Collector-Emitter Voltage | $V_{CEO}$ | 100 | V | | Emitter-Base Voltage | $V_{EBO}$ | 6.0 | V | | Continuous Collector Current | $I_C$ | 6.0 | A | | Peak Collector Current | $I_{CM}$ | 10 | A | | Power Dissipation | $P_D$ | 1.2 | W | | Junction Temperature | $T_J$ | -65 to +150 | °C | --- ## 2. Electrical Characteristics The CXT853 is prized for its high efficiency and current handling capabilities. * **Low Saturation Voltage ($V_{CE(sat)}$):** Typically around 0.20V at $I_C = 2A$, which reduces power loss and heat generation during switching. * **High Current Gain ($h_{FE}$):** It maintains a high gain across a wide range of collector currents (typically 100 to 300). * **Transition Frequency ($f_T$):** Usually around 100 MHz, making it suitable for high-speed switching and power management. --- ## 3. Applications Due to its 6A current rating and low saturation voltage, the CXT853 is commonly used in: 1. **DC-DC Converters:** Acts as a high-efficiency switch. 2. **Motor Control:** Driving small to medium DC motors. 3. **LED Drivers:** Managing high-current LED strings. 4. **Power Management:** Battery charging circuits and voltage regulators. --- ## 4. Package Configuration (SOT-89) The device uses a standard SOT-89 footprint, which includes a large metal tab for heat dissipation. ```text Pinout Diagram (Top View): _______ | 4 | (Tab) |_______| | 1 | 2 | 3 | ------------- 1: Emitter 2: Collector (connected to tab) 3: Base ``` ---