The **LR9101L-12-AE2-R** is a low-dropout (LDO) linear voltage regulator manufactured by UTC (Unisonic Technologies Co., Ltd). It is designed to provide a stable 1.2V output from a higher input voltage with minimal power loss. --- ### ## Technical Specifications Below are the core parameters for the LR9101L-12-AE2-R: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 1.2V (Fixed) | | **Maximum Output Current** | 300mA | | **Input Voltage Range** | Up to 6.0V | | **Package Type** | SOT-23-3 | | **Dropout Voltage** | Low (Typically < 200mV at full load) | | **Quiescent Current** | Low power consumption (Ideal for battery use) | | **Protection Features** | Thermal Shutdown, Current Limiting | --- ### ### Key Features and Benefits 1. **Low Dropout (LDO):** The "L" in the series signifies its ability to maintain a stable output even when the input voltage is only slightly higher than the target output. 2. **Compact Form Factor:** The **SOT-23-3** package is extremely small, making it suitable for space-constrained applications like smartphones or IoT sensors. 3. **Low Noise:** Linear regulators provide much cleaner power compared to switching regulators (DC-DC converters), which is vital for sensitive analog circuits. 4. **Simplicity:** Being a fixed-voltage regulator, it requires minimal external components (usually just two small capacitors). --- ### ### Part Number Breakdown The alphanumeric code provides specific details about the component's configuration: * **LR9101L:** Base series (CMOS Low Dropout Regulator). * **12:** Represents the output voltage (1.2 Volts). * **AE2:** Refers to the **SOT-23-3** package type. * **R:** Indicates "Tape and Reel" packaging for automated assembly. --- ### ### Application Circuit Example To use this part, you typically need an input capacitor ($C_{IN}$) and an output capacitor ($C_{OUT}$) to ensure stability and filter noise. ```text Input (e.g. 3.3V) ----[ Vin ]-------[ Vout ]---- Output (1.2V) | | [C_in] [C_out] | | GND ------------------[ GND ]---------|---------- GND ``` ---