The **UT2309G-AE3-R** is a high-performance, P-Channel enhancement mode Field Effect Transistor (MOSFET) manufactured by UTC (Unisonic Technologies). It is widely used in power management applications due to its low on-resistance and compact surface-mount design. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics for the UT2309G-AE3-R: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | -30 V | | **Gate-Source Voltage** | $V_{GSS}$ | ±20 V | | **Continuous Drain Current** | $I_D$ | -1.6 A | | **Pulsed Drain Current** | $I_{DM}$ | -10 A | | **Power Dissipation** | $P_D$ | 0.35 W | | **Static Drain-Source On-Resistance** | $R_{DS(ON)}$ | 150 mΩ (at $V_{GS}$ = -10V) | | **Package Type** | SOT-23 | Tape & Reel (R) | --- ### 2. Functional Description As a **P-Channel MOSFET**, this device operates by using a negative gate-source voltage to allow current to flow between the Source and the Drain. It is particularly valued for its "Logic Level" compatibility, meaning it can be fully driven by low-voltage microcontrollers. #### Main Features: * **Low On-Resistance:** Reduces power loss and heat generation during operation. * **Fast Switching:** Suitable for high-frequency PWM applications. * **Halogen-Free:** The "G" in the part number indicates it is a "Green" (Halogen-free and RoHS compliant) component. * **Compact Footprint:** The SOT-23 package is ideal for space-constrained circuit boards. --- ### 3. Pin Configuration (SOT-23) The device follows the standard SOT-23 pinout: 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 The UT2309G-AE3-R is typically found in the following circuits: * **Load Switches:** Turning off power to specific sub-systems to save energy. * **Battery Management:** Protection circuits and charging paths in portable electronics. * **DC-DC Converters:** Used in the switching stage of buck or boost regulators. * **LED Drivers:** Controlling power to high-brightness LED arrays. --- ### 5. Part Number Breakdown ```text UT2309 G - AE3 - R | | | | | | | +-- Packing: Tape & Reel | | +------- Package: SOT-23 (AE3) | +------------ Halogen Free / Green (G) +------------------ Model Series (UT2309) ```