## Technical Overview of US107AHG-AF5-R The **US107AHG-AF5-R** is a high-performance, low-dropout (LDO) linear voltage regulator manufactured by **UTC (Unisonic Technologies Co., Ltd)**. It is specifically designed for applications requiring high output accuracy and low noise. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | CMOS Low Dropout Regulator (LDO) | | **Output Type** | Adjustable (ADJ) | | **Output Voltage Range** | 0.8V to 5.0V | | **Maximum Output Current** | 600mA | | **Dropout Voltage** | ~230mV @ 600mA (Typical) | | **Input Voltage Range** | 2.5V to 6.0V | | **Package Type** | SOT-25 (AF5) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown Understanding the suffix nomenclature helps in identifying the specific variant: * **US107A**: Product Series (600mA LDO). * **HG**: High Accuracy / Specific Grade identifier. * **AF5**: Package code for **SOT-25** (Small Outline Transistor with 5 pins). * **R**: Packing style (typically Tape & Reel). --- ### 3. Pin Configuration (SOT-25) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **VIN** | Power Supply Input | | 2 | **GND** | Ground | | 3 | **CE / EN** | Chip Enable (Active High) | | 4 | **ADJ / FB** | Feedback / Adjust pin for setting voltage | | 5 | **VOUT** | Regulated Output Voltage | --- ### 4. Functional Features * **Low Quiescent Current:** Minimizes power consumption during standby, extending battery life in portable devices. * **Built-in Protections:** * *Thermal Shutdown:* Protects the IC from overheating. * *Current Limiting:* Prevents damage during output short-circuits. * **Fast Transient Response:** Capable of maintaining stability during sudden changes in load or input voltage. * **Stability with Ceramic Capacitors:** Optimized to work with low-ESR ceramic capacitors, reducing PCB footprint. --- ### 5. Common Applications Due to its small size and high current capability, the US107AHG is commonly used in: * Mobile phones and handheld PDAs. * Battery-powered equipment. * Post-regulation for switching power supplies. * Laptop and notebook peripheral power.