The **UT138FGL-5-TF3-R** is a specific part number typically associated with a **Low Dropout (LDO) Voltage Regulator**, manufactured by Unisonic Technologies (UTC). --- ## 1. Technical Specifications Overview This component is designed to provide a stable 5V output from a higher input voltage with minimal voltage loss (dropout). | Parameter | Specification | | :--- | :--- | | **Output Voltage** | Fixed 5.0V | | **Maximum Output Current** | 300mA - 500mA (typical for UT138 series) | | **Package Type** | SOT-89 or TO-252 (indicated by TF3 suffix) | | **Quiescent Current** | Low (typically < 100µA) | | **Input Voltage Range** | Up to 12V - 15V (application dependent) | --- ## 2. Part Number Breakdown Understanding the nomenclature helps identify the exact physical and electrical characteristics: * **UT138**: The series name (Low Dropout Positive Voltage Regulator). * **F**: Often denotes high-accuracy or specific Lead-free/Halogen-free compliance. * **G**: Green/Halogen Free material. * **L**: Lead-free plating. * **5**: Represents the fixed **5.0 Volt** output. * **TF3**: Refers to the **SOT-89** package (UTC-specific package code). * **R**: Indicates **Tape & Reel** packaging for automated assembly. --- ## 3. Key Features * **Low Dropout Voltage:** Can maintain 5V output even when the input voltage is only slightly above 5V (e.g., 5.5V). * **Internal Protection:** Usually includes thermal shutdown and current limiting to prevent damage during circuit faults. * **Stability:** Designed to be stable with low-cost ceramic capacitors. --- ## 4. Typical Applications The UT138FGL-5-TF3-R is commonly used in battery-powered or space-constrained electronics: 1. **Consumer Electronics:** Powering microcontrollers in remote controls or small appliances. 2. **Communication Equipment:** Providing clean power to RF modules or sensors. 3. **Industrial Controls:** Localized voltage regulation on PCBs where a 5V rail is required from a 12V bus. ---