The **LR1102AG-2J-AF5-R** is a specific low-dropout (LDO) linear voltage regulator manufactured by **UTC (Unisonic Technologies)**. This component is designed for low-power, high-accuracy applications, typically used to provide a stable voltage supply for sensitive analog circuits or microcontrollers. --- ### 1. Key Technical Specifications The part number follows a specific coding system that defines its characteristics: | Feature | Specification | | :--- | :--- | | **Output Voltage** | 2.8V (Fixed) | | **Input Voltage Range** | Up to 6V (approx.) | | **Dropout Voltage** | Low (typically < 300mV at full load) | | **Maximum Output Current** | 300mA | | **Accuracy** | ±2% | | **Package Type** | SOT-25 (AF5) | | **Quiescent Current** | Low (typically < 70µA) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying equivalent parts or variations: * **LR1102**: Base series name (CMOS LDO Regulator). * **A**: Version/Rank indicator. * **G**: Halogen-free and Lead-free (Green). * **2J**: Voltage code (where 2J specifically represents **2.85V** or **2.8V** depending on the specific UTC revision table). * **AF5**: Package code for **SOT-25**. * **R**: Tape and Reel packaging. --- ### 3. Pin Configuration (SOT-25) The device typically follows a standard 5-pin layout: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **VIN** | Input Supply Voltage | | 2 | **GND** | Ground | | 3 | **CE / EN** | Chip Enable (Active High) | | 4 | **NC / BP** | No connection or Bypass Capacitor (for noise reduction) | | 5 | **VOUT** | Regulated Output Voltage | --- ### 4. Application Use Cases * **Mobile Devices**: Stable power for RF modules or sensors. * **Battery Powered Equipment**: Efficient power management due to low quiescent current. * **Post-Regulation**: Used after a switching regulator to "clean up" noise for sensitive analog components. --- ### 5. Circuit Implementation Example To use this part effectively, the following basic circuit is recommended: ```text [VIN] ----[ C_in: 1uF ]---- (Pin 1: VIN) (Pin 2: GND) ---- [GND] [Enable Signal] ----------- (Pin 3: CE) (Pin 4: BP) ---- [C_bp: 10nF (Optional)] [VOUT] ----[ C_out: 1uF ]--- (Pin 5: VOUT) ```