The **UT3404L-AE3-R** is an N-Channel enhancement mode Field Effect Transistor (MOSFET) produced by Unisonic Technologies (UTC). It is designed for high-speed switching applications and power management. --- ## 1. Technical Specifications The following table highlights the primary electrical characteristics of the UT3404L-AE3-R: | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | 30 | V | | **Gate-Source Voltage** | $V_{GSS}$ | ±20 | V | | **Continuous Drain Current** | $I_D$ | 5.8 | A | | **Pulsed Drain Current** | $I_{DM}$ | 30 | A | | **Drain-Source On-Resistance** | $R_{DS(ON)}$ | 28 (at $V_{GS}=10V$) | mΩ | | **Total Gate Charge** | $Q_g$ | 3.6 | nC | | **Package Type** | SOT-23 | AE3 | - | --- ## 2. Key Features and Benefits * **Low On-Resistance:** The low $R_{DS(ON)}$ minimizes power dissipation during the "on" state, improving overall efficiency. * **Fast Switching:** Small gate charge ($Q_g$) allows for high-frequency operation and rapid transitions between states. * **Logic Level Compatibility:** It can be driven directly by microcontrollers or logic ICs because it operates effectively at low gate voltages. * **Halogen-Free:** The "L" in the part number usually signifies a Lead-free/Halogen-free construction, adhering to environmental standards. --- ## 3. Pin Configuration (SOT-23) The device is housed in a standard **SOT-23** (coded as **AE3** by UTC) package. | Pin Number | Designation | Description | | :--- | :--- | :--- | | 1 | **G (Gate)** | Controls the biasing of the MOSFET. | | 2 | **S (Source)** | Terminal where current exits the channel. | | 3 | **D (Drain)** | Terminal where current enters the channel. | --- ## 4. Typical Applications The UT3404L is commonly used in portable and low-power electronic devices: * **DC-DC Converters:** Used as a switching element for voltage regulation. * **Load Switching:** Acts as an electronic switch to turn on/off power to specific circuit blocks. * **Battery Management:** Used in protection circuits for Li-ion battery packs. * **Motor Drive:** Small DC motor control for consumer electronics. ---