The **79L10L-AB3-R** is a specific part number for a low-power linear voltage regulator. This component is designed to provide a stable **negative 10V** output from a higher negative input voltage. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. Part Number Breakdown The nomenclature typically follows the standards of manufacturers like **UTC (Unisonic Technologies)**: | Segment | Meaning | Description | | :--- | :--- | :--- | | **79L** | Series | Negative Voltage Regulator (Low Power) | | **10** | Voltage | Fixed Output of -10 Volts | | **L** | Lead-Free | Indicates RoHS compliance/Green-product | | **AB3** | Package | SOT-89 surface mount package | | **R** | Tape & Reel | Packaging method for automated assembly | --- ### 2. Key Technical Specifications The 79L10 is the "little brother" to the standard 7910 series, designed for smaller loads. | Feature | Specification | | :--- | :--- | | **Output Voltage** | -10V (Fixed) | | **Maximum Output Current** | 100mA | | **Input Voltage (Max)** | -30V to -35V (approx.) | | **Dropout Voltage** | ~1.7V to 2.0V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SOT-89 (Small Outline Transistor) | --- ### 3. Pin Configuration (SOT-89) In the SOT-89 package, the pinout is typically arranged as follows: 1. **GND**: Ground Reference. 2. **Input (V_in)**: Negative DC input voltage. 3. **Output (V_out)**: Regulated -10V output. *Note: In negative regulators, the tab is usually connected to the Input pin, but always verify with the specific datasheet.* --- ### 4. Typical Application Circuit To ensure stability and reduce noise, external capacitors are required. ```markdown GND ----------------+-----------------+---- GND | | Input (-15V) ---[ C1 ]----+----[ 79L10 ]----+--- Output (-10V) | | | +------[ C2 ]-----+ C1 (Input Capacitor): 0.33uF (Tantalum) or 2.2uF (Electrolytic) C2 (Output Capacitor): 0.1uF to 1.0uF (Ceramic or Tantalum) ``` ### 5. Common Uses * **Operational Amplifier (Op-Amp) Power:** Providing the negative rail for dual-supply circuits. * **Data Conversion:** Powering ADCs and DACs that require bipolar power. * **Instrumentation:** Low-noise power supplies for sensors. * **Communication Equipment:** Localized voltage regulation on PCBs to prevent noise interference. ---