The **LR1106L-18-AF5-R** is a low-dropout (LDO) linear regulator manufactured by UTC (Unisonic Technologies). It is designed to provide a stable, fixed output voltage with high precision and low noise. --- ### ## 1. Part Number Breakdown Understanding the suffix codes helps identify the specific characteristics of this component: | Component Code | Meaning | | :--- | :--- | | **LR1106** | Series name (Low Dropout Linear Regulator) | | **L** | Lead-free / Halogen-free (Green) | | **18** | Output Voltage (1.8V Fixed) | | **AF5** | Package Type (SOT-25 / SOT-23-5) | | **R** | Packing (Tape & Reel) | --- ### ## 2. Technical Specifications Below are the primary electrical characteristics of the device: | Parameter | Value / Range | | :--- | :--- | | **Output Voltage** | 1.8V (Fixed) | | **Input Voltage Range** | Up to 6.0V | | **Output Current** | 250mA - 300mA (Typical) | | **Dropout Voltage** | ~200mV @ 100mA (Low Dropout) | | **Quiescent Current** | ~50µA (Low Power consumption) | | **Operating Temp** | -40°C to +85°C | --- ### ## 3. Pin Configuration (SOT-25/SOT-23-5) The LR1106L-18-AF5-R typically follows the standard 5-pin SOT-23 layout: 1. **VIN**: Input Voltage supply. 2. **GND**: Ground. 3. **CE/EN**: Chip Enable (High = On, Low = Shutdown). 4. **NC/BYP**: No connection or Bypass capacitor (depending on sub-version). 5. **VOUT**: Regulated 1.8V Output. --- ### ## 4. Key Features & Applications * **High Accuracy:** Usually within ±2% output voltage tolerance. * **Low Noise:** Suitable for sensitive RF and analog circuits. * **Built-in Protections:** Includes thermal shutdown and current limit protection. * **Common Applications:** * Battery-powered equipment. * Mobile phones and handheld devices. * Post-regulation for switching supplies. * Low voltage microcontrollers (MCUs). --- ### ## 5. Typical Application Circuit To ensure stability, LDOs require external capacitors. ```markdown Input (2.5V-6V) ----[ VIN ]-------[ VOUT ]---- Output (1.8V) | | [ C1 ] [ C2 ] (Capacitors: 1uF - 10uF) | | GND ------------------[ GND ]-------[ GND ] ```