The **78L08G-AF5-R** is a specific part number for a low-power, positive fixed voltage regulator. It is designed to provide a stable 8V output from a higher unregulated input voltage. Below is a detailed breakdown of its specifications, pinout, and characteristics. --- ### 1. General Overview The "78Lxx" series is the low-power version of the standard 78xx series. While standard 7808 regulators can handle up to 1.5A, the "L" version is restricted to smaller currents, making it ideal for signal processing and small electronic modules. | Feature | Specification | | :--- | :--- | | **Output Voltage** | +8.0V DC | | **Max Output Current** | 100mA | | **Input Voltage Range** | 10.5V to 23V (Recommended) | | **Package Type** | SOT-25 (AF5) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Part Number Breakdown Understanding the suffix helps identify the exact physical and chemical properties: * **78L08**: Fixed 8V Positive Regulator. * **G**: Halogen-free and RoHS compliant (Green). * **AF5**: Refers to the **SOT-25** (also known as SOT-23-5) package. * **R**: Tape and Reel packaging for automated assembly. --- ### 3. Pin Configuration (SOT-25) In the AF5 package, the pinout is typically organized as follows (always verify with the specific manufacturer datasheet like UTC): | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **OUT** | Regulated 8V Output | | **2** | **GND** | Ground reference | | **3** | **NC/NC** | No Connection (or specific vendor function) | | **4** | **NC/NC** | No Connection | | **5** | **IN** | Unregulated Input Voltage | --- ### 4. Key Electronic Features * **Internal Current Limiting**: Protects the device from burning out if the output is short-circuited. * **Thermal Overload Protection**: The device will shut down if it becomes too hot due to high power dissipation ($P = (V_{in} - V_{out}) \times I_{out}$). * **Low Quiescent Current**: It consumes very little power internally (typically around 3-5mA). --- ### 5. Application Circuit To ensure stability and reduce noise, external capacitors are required: ```text Input (10.5V+) ----[ C1: 0.33uF ]----( Pin 5: IN ) ( Pin 1: OUT )----[ C2: 0.1uF ]---- Output (8V) ( Pin 2: GND ) | Ground ``` ---