The **UT7401G-AL3-R** is a specific electronic component manufactured by **UTC (Unisonic Technologies)**. It is a high-performance Power MOSFET designed primarily for switching applications and power management in portable devices. --- ### 1. General Specifications The following table summarizes the key electrical characteristics of the UT7401G-AL3-R: | Parameter | Value | Description | | :--- | :--- | :--- | | **Component Type** | P-Channel MOSFET | Logic-level enhancement mode | | **Package Type** | SOT-23 | Small Outline Transistor (Surface Mount) | | **Drain-Source Voltage ($V_{DSS}$)** | -30 V | Maximum voltage across Drain and Source | | **Gate-Source Voltage ($V_{GSS}$)** | ±20 V | Maximum allowable gate voltage | | **Continuous Drain Current ($I_D$)** | -3.0 A | Maximum constant current flow | | **Drain-Source On-Resistance ($R_{DS(ON)}$)** | ~50 mΩ | Measured at $V_{GS} = -10V$ | | **Marking Code** | 7401G | Identification on the physical package | --- ### 2. Key Features * **Low On-Resistance:** Reduces power dissipation during conduction, increasing efficiency in battery-powered devices. * **Low Gate Charge:** Allows for high-speed switching and reduces the drive requirements from the microcontroller or PWM controller. * **Green Product:** The "G" suffix typically denotes a "Halogen Free" or "Green" lead-free finish, complying with RoHS standards. * **Logic Level Compatibility:** Can be fully turned on with low gate voltages (e.g., -4.5V), making it compatible with 5V or 3.3V logic circuits. --- ### 3. Pinout Configuration (SOT-23) The SOT-23 package has 3 pins. For the UT7401G: 1. **Pin 1 (Gate):** Controls the turning on/off of the MOSFET. 2. **Pin 2 (Source):** The input point for the current in a P-channel setup. 3. **Pin 3 (Drain):** The output point where the load is usually connected. --- ### 4. Common Applications Due to its small footprint and high current capability, the UT7401G-AL3-R is used in: * **Load Switching:** Turning peripheral devices on/off to save power. * **Battery Management:** Protection circuits and charging paths in smartphones or laptops. * **DC-DC Converters:** Serving as the switching element in buck or boost regulators. * **LED Driving:** Controlling current flow to LED arrays. --- ### 5. Part Number Decoding The UTC part numbering system for this component can be broken down as follows: * **UT7401:** The basic part series (P-Channel MOSFET). * **G:** Halogen-free and Lead-free (Green). * **AL3:** SOT-23 Package code. * **R:** Tape and Reel packaging.