The **8147-AF5-D-R** is a specific part number typically associated with a **Low Dropout (LDO) Voltage Regulator**, commonly manufactured by companies like UTC (Unisonic Technologies). Below is the technical breakdown of this electronic component. --- ### 1. Part Number Decoder The suffix and prefix provide specific details regarding its packaging and electrical characteristics: | Code Segment | Meaning | | :--- | :--- | | **8147** | Series number (referring to a 4.7V output regulator) | | **AF5** | Package Type (typically **SOT-25** / **SOT-23-5**) | | **D** | Halogen-free and Lead-free (Green product) | | **R** | Packing type (Tape & Reel) | --- ### 2. Technical Specifications This component is designed for battery-powered applications requiring low noise and low quiescent current. | Feature | Specification (Typical) | | :--- | :--- | | **Output Voltage** | 4.7V (Fixed) | | **Input Voltage Range** | Up to 12V - 15V (Max) | | **Output Current** | 300mA to 600mA (depending on thermal dissipation) | | **Dropout Voltage** | Low (approx. 200-400mV at full load) | | **Quiescent Current** | Very Low (~50µA to 70µA) | | **Protection** | Thermal Shutdown, Short Circuit Protection | --- ### 3. Pin Configuration (SOT-25) Standard layout for the AF5 package: 1. **VIN**: Input Voltage. 2. **GND**: Ground. 3. **EN (Enable)**: High = On, Low = Shutdown. 4. **NC/BP**: No connection or Bypass capacitor (for noise reduction). 5. **VOUT**: Regulated 4.7V output. --- ### 4. Typical Applications * **Mobile Devices**: Smartphones and tablets. * **Portable Electronics**: Cameras and handheld gaming devices. * **Voltage Reference**: Providing a steady 4.7V rail for sensors. * **Post-Regulation**: Cleaning up noise from switching power supplies. --- ### 5. Implementation Example ```c // Concept: Powering a 4.7V Logic Rail // Input: Li-ion Battery (3.7V - 4.2V) or USB (5V) // Output: Stable 4.7V (Requires Vin > 4.7V + Dropout) [V_IN] --(10uF Cap)-- [8147-AF5 Pin 1] [8147-AF5 Pin 5] --(10uF Cap)-- [Load/V_OUT] [8147-AF5 Pin 2] -- [GND] ``` ---