The **UT3409L-AE3-R** is a high-performance, P-Channel enhancement mode Field Effect Transistor (MOSFET) designed by Unisonic Technologies (UTC). It is commonly used in power management applications due to its low on-resistance and compact footprint. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the UT3409L-AE3-R: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | -30 V | | **Gate-Source Voltage** | $V_{GSS}$ | ±12 V | | **Continuous Drain Current** | $I_D$ | -5.1 A | | **Pulsed Drain Current** | $I_{DM}$ | -20 A | | **Power Dissipation** | $P_D$ | 1.4 W | | **Static Drain-Source On-Resistance** | $R_{DS(ON)}$ | 40 mΩ @ $V_{GS}$ = -10V | | **Package Type** | SOT-23 | Tape & Reel (R) | --- ### 2. Functional Features The UT3409L-AE3-R is engineered with specific physical and electrical traits: * **P-Channel Logic Level:** Designed to be driven by low-voltage logic circuits, making it ideal for interfacing with microcontrollers. * **Low $R_{DS(ON)}$:** Minimizes power loss through heat, which increases efficiency in battery-powered devices. * **Fast Switching:** Optimized for high-speed switching applications. * **Halogen-Free:** The "L" in the part number signifies a Lead-free/Halogen-free product, adhering to RoHS standards. --- ### 3. Pin Configuration (SOT-23) The SOT-23 package is a three-lead surface mount device. The typical pinout for this part is: 1. **Gate (G):** Controls the biasing of the MOSFET. 2. **Source (S):** Connected to the positive supply in most P-Channel configurations. 3. **Drain (D):** Connected to the load. --- ### 4. Common Applications This MOSFET is typically found in the following circuits: * **Load Switches:** Turning power on/off to specific sub-systems. * **Battery Protection:** Preventing over-discharge or reverse polarity. * **DC-DC Converters:** Used in the switching stage of power supplies. * **LED Driving:** Controlling high-current LED arrays. --- ### 5. Part Number Breakdown Understanding the nomenclature: * **UT:** Unisonic Technologies (Manufacturer). * **3409:** Model number (P-Channel 30V). * **L:** Lead-free / Halogen-free. * **AE3:** Package code for SOT-23. * **R:** Tape and Reel packaging.