The **UT3409L-AE2-R** is a specific P-Channel enhancement mode Field Effect Transistor (MOSFET) manufactured by Unisonic Technologies (UTC). It is widely used in power management and switching applications due to its low on-resistance and small form factor. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics for the UT3409L-AE2-R: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | -30 V | | **Gate-Source Voltage** | $V_{GSS}$ | ±20 V | | **Continuous Drain Current** | $I_D$ | -5.1 A | | **Drain-Source On-Resistance** | $R_{DS(ON)}$ | 40 mΩ @ $V_{GS}$ = -10V | | **Power Dissipation** | $P_D$ | 1.4 W | | **Package Type** | SOT-23-3 | - | --- ### 2. Physical and Ordering Information The part number can be broken down to understand the packaging and material: * **UT3409**: The basic model number (P-Channel MOSFET). * **L**: Lead-free / Halogen-free plating. * **AE2**: Refers to the **SOT-23-3** package type. * **R**: Tape and Reel packaging for automated assembly. ### 3. Features and Benefits * **High-Speed Switching:** Optimized for rapid transitions between ON and OFF states. * **Low $R_{DS(ON)}$:** Minimizes power loss during conduction, improving efficiency. * **Low Threshold Voltage:** Can be driven by low-voltage logic circuits. * **Compact Footprint:** The SOT-23 package is ideal for high-density PCB designs. ### 4. Typical Applications The UT3409L is commonly found in the following circuits: 1. **Load Switches:** Controlling power to specific subsystems in portable electronics. 2. **Battery Protection:** Used in BMS (Battery Management Systems) for charging/discharging control. 3. **DC-DC Converters:** Serving as a switching element in buck or boost regulators. 4. **LED Drivers:** Managing current for lighting modules. --- ### Pin Configuration (SOT-23) ```text (Top View) ____ G |1 | | | 3 D S |2___| 1. Gate (G) - Controls the MOSFET 2. Source (S) - Common terminal 3. Drain (D) - Current output ```