The **UT4101G-AE3-R** is a high-performance, low-threshold P-Channel enhancement mode Field Effect Transistor (MOSFET) manufactured by Unisonic Technologies (UTC). It is primarily designed for power management and switching applications in portable devices. --- ### 1. Key Specifications The following table summarizes the primary electrical characteristics of the UT4101G-AE3-R: | Parameter | Symbol | Maximum Rating | | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | -20 V | | **Gate-Source Voltage** | $V_{GSS}$ | ±8 V | | **Continuous Drain Current** | $I_D$ | -2.4 A | | **Pulsed Drain Current** | $I_{DM}$ | -10 A | | **Power Dissipation** | $P_D$ | 0.35 W | | **Operating Temperature** | $T_J$ | -55°C to +150°C | --- ### 2. Physical and Package Details The suffix in the part number provides specific information regarding its physical construction: * **Package Type:** **SOT-23** (AE3). This is a small, three-lead surface-mount package. * **Halogen-Free:** The "G" indicates that the part is Green/Halogen-Free. * **Packing:** The "R" indicates that the parts are supplied on a Tape and Reel. --- ### 3. Features and Advantages The UT4101G-AE3-R is engineered for efficiency in modern electronics through the following features: * **Low On-Resistance ($R_{DS(ON)}$):** It features very low resistance when turned on (typically ~100mΩ at -4.5V), which minimizes power loss and heat generation. * **Low Threshold Voltage:** It can be fully triggered by low-voltage logic (starting around -0.45V to -1.0V), making it ideal for battery-operated circuits. * **High-Speed Switching:** Optimized for fast transitions, reducing switching losses in DC-DC converters. --- ### 4. Typical Applications Due to its small footprint and P-channel logic, it is commonly used in: 1. **Load Switches:** Controlling power rails in smartphones and tablets. 2. **Battery Protection:** Managing charging and discharging paths in Li-ion battery packs. 3. **DC-DC Converters:** Serving as the high-side switch in buck converters. 4. **LED Drivers:** Small-scale lighting control circuits. --- ### 5. PIN Configuration The SOT-23 package follows a standard pinout: ```text SOT-23 (Top View) _______ G 1| | | |3 D S 2|_______| 1. G = Gate (Control) 2. S = Source (Input/Positive Rail for P-CH) 3. D = Drain (Output/To Load) ```