## Analysis of the UTD484L-TN3-R The **UTD484L-TN3-R** is an N-Channel enhancement mode Power MOSFET manufactured by Unisonic Technologies Co., Ltd (UTC). It is designed primarily for high-efficiency switching applications, such as power management and DC-DC converters. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the device: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | 40 | V | | **Gate-Source Voltage** | $V_{GSS}$ | $\pm$20 | V | | **Continuous Drain Current** | $I_D$ | 20 | A | | **Static Drain-Source On-Resistance** | $R_{DS(ON)}$ | 28 (Max @ $V_{GS}=10V$) | m$\Omega$ | | **Total Gate Charge** | $Q_g$ | 12 (Typ) | nC | | **Operating Temperature** | $T_J$ | -55 to +150 | °C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical variants: * **UTD**: UTC Product Series (Power MOSFET). * **484**: Part Identification Number. * **L**: Lead-free / Halogen-free plating. * **TN3**: Package code for **TO-252** (also known as D-PAK). * **R**: Tape and Reel packaging. --- ### 3. Electronic Features The UTD484L-TN3-R incorporates several design features to enhance circuit performance: * **Low On-Resistance ($R_{DS(ON)}$):** Minimizes power dissipation during the "ON" state, which improves overall system efficiency. * **Fast Switching Speed:** The low gate charge ($Q_g$) allows the device to transition between states quickly, reducing switching losses. * **Ruggedness:** Designed to handle high-speed transients and high current pulses commonly found in power supplies. * **Logic Level Compatibility:** Can be driven by relatively low gate voltages, making it suitable for direct interface with many controllers. --- ### 4. Typical Applications This MOSFET is commonly integrated into the following systems: 1. **DC/DC Converters:** Used as a switching element in buck or boost regulators. 2. **Motor Control:** Utilized in H-Bridge configurations for small DC motors. 3. **Load Switching:** Acts as an electronic switch to turn on/off power rails in portable electronics. 4. **Power Management:** Found in battery protection circuits and power distribution units. ---