The **79L15ACD-R2** is a specific surface-mount version of the 79L15 series linear voltage regulator. It is designed to provide a fixed negative output voltage. --- ### 1. General Overview The 79L15 belongs to the "79xx" family of negative voltage regulators (complementary to the "78xx" positive series). The "L" indicates that it is a **Low-power** version, typically capable of delivering up to 100mA of output current. ### 2. Key Specifications | Parameter | Description | Typical Value | | :--- | :--- | :--- | | **Output Voltage** | Regulated Negative Voltage | -15V | | **Input Voltage Range** | Maximum Input | -17.5V to -30V | | **Output Current** | Maximum Load Current | 100 mA | | **Package Type** | Surface Mount | SOIC-8 (typically) | | **Operating Temperature** | Range | 0°C to +70°C | | **Quiescent Current** | Internal power consumption | ~6 mA | ### 3. Pinout Configuration (SOIC-8 Package) Unlike the TO-92 version (3 pins), the SOIC-8 package uses multiple pins for heat dissipation and standard footprint compatibility. | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **Output** | Regulated -15V Output | | 2, 3, 6, 7 | **GND** | Ground/Common Reference | | 4 | **NC** | No Connection | | 5 | **NC** | No Connection | | 8 | **Input** | Unregulated Negative Input | --- ### 4. Typical Application Circuit To ensure stability and reduce noise, external capacitors are required. ```markdown (Input -20V) ----[ 8: IN ]-------+-------[ 1: OUT ]---- (Output -15V) | | [C1] [C2] | | (Ground) ---------------------+-----------------+---- (GND) C1: 0.33uF (Tantalum or Ceramic) C2: 0.1uF (To improve transient response) ``` ### 5. Common Uses * **Operational Amplifier Power:** Op-amps often require dual polarities (e.g., +15V and -15V). * **Signal Processing:** Used in audio circuits where negative rails are necessary for symmetrical waveforms. * **Industrial Controls:** Localized regulation for low-current analog sensors. --- ### 6. Part Number Breakdown: **79L15ACD-R2** * **79**: Negative Voltage Regulator family. * **L**: Low power (100mA). * **15**: Output voltage value (-15V). * **A**: Accuracy grade (usually 4% or 5% tolerance). * **CD**: Package designator (SOIC-8). * **R2**: Tape and Reel packaging specification (for automated assembly).