## UT85N03L-TQ2-R: Electronic Component Analysis The **UT85N03L-TQ2-R** is an N-Channel Power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) designed by Unisonic Technologies (UTC). It is engineered for high-efficiency switching and low-voltage power management applications. --- ### 1. Key Technical Specifications The following table outlines the primary electrical characteristics of the device: | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | 30 | V | | **Continuous Drain Current** | $I_D$ | 85 | A | | **Static Drain-Source On-Resistance** | $R_{DS(ON)}$ | 6.0 (max @ 10V) | mΩ | | **Gate-Source Voltage** | $V_{GS}$ | ±20 | V | | **Total Gate Charge** | $Q_g$ | 45 | nC | | **Package Type** | - | TO-263 (D2PAK) | - | --- ### 2. Physical and Package Characteristics The "TQ2-R" suffix in the part number provides specific information about the physical form factor: * **Package (TQ2):** Refers to the **TO-263** (also known as D2PAK). This is a surface-mount package designed for high power dissipation. * **Packing (R):** Indicates **Tape and Reel** packaging, which is standard for automated Pick-and-Place assembly lines. * **Thermal Pad:** The large metal tab on the back is connected to the **Drain**, allowing for efficient heat transfer to the PCB copper planes. --- ### 3. Functional Features * **Logic Level Drive:** The "L" in the part number often indicates a **Logic Level** gate threshold, meaning the MOSFET can be fully turned on using 4.5V or 5V logic signals rather than needing 10V+. * **Low $R_{DS(ON)}$:** This minimizes conduction losses, making it ideal for high-current applications where heat generation must be kept to a minimum. * **Fast Switching:** Optimized gate charge allows for high-frequency operation, reducing switching losses in DC-DC converters. --- ### 4. Common Applications Due to its high current handling and low resistance, the UT85N03L is typically found in: 1. **DC-DC Converters:** Synchronous rectification and buck converters for PC motherboards or industrial power supplies. 2. **Motor Controllers:** H-bridge circuits for driving DC motors in robotics or automotive accessories. 3. **Battery Management Systems (BMS):** Load switching and protection circuits in high-capacity battery packs. 4. **Power Inverters:** Stage conversion for renewable energy systems or UPS units. --- ### 5. Identification Code Breakdown | Segment | Meaning | | :--- | :--- | | **UT** | Unisonic Technologies (Manufacturer) | | **85N03** | 85 Amps / 30 Volts rating | | **L** | Logic Level Gate Drive | | **TQ2** | TO-263 Package | | **R** | Tape and Reel |