The **78L08L-AB3-R** is a specific part number for a 3-terminal positive voltage regulator. It belongs to the 78Lxx series, which is the low-power version of the standard 78xx family. --- ### 1. Technical Specifications The part is designed to provide a stable, fixed output voltage from a higher, fluctuating input voltage. | Parameter | Specification | | :--- | :--- | | **Output Voltage** | +8V DC | | **Maximum Output Current** | 100 mA | | **Maximum Input Voltage** | 30V - 35V | | **Quiescent Current** | 3mA - 5mA | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SOT-89 (Small Outline Transistor) | --- ### 2. Part Number Breakdown The suffix and prefix provide specific information about the manufacturer (often UTC - Unisonic Technologies) and the packaging: * **78L**: Fixed positive voltage regulator (Low power / 100mA). * **08**: Indicates an **8 Volt** output. * **L**: Lead-free / RoHS compliant. * **AB3**: Refers to the **SOT-89** package style. * **R**: Tape and Reel (Packaging method for automated assembly). --- ### 3. Pinout Configuration (SOT-89) When looking at the front of the device (pins pointing down), the pinout is typically: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **Vout** | Stabilized 8V Output | | 2 | **GND** | Ground (Common) | | 3 | **Vin** | Unregulated Input Voltage | --- ### 4. Key Features & Protections The 78L08L-AB3-R includes internal circuitry to prevent damage during failure: * **Internal Thermal Overload Protection:** Shuts down the device if it gets too hot. * **Short Circuit Current Limiting:** Limits the current if the output is grounded. * **No External Components Required:** While capacitors are recommended for stability, the basic regulation is handled entirely on-chip. --- ### 5. Application Circuit To use this part effectively, it is recommended to use decoupling capacitors to filter noise and prevent oscillation. ```text Input (Vin) ----[ 0.33uF Cap ]----( Pin 3 | 78L08 | Pin 1 )----[ 0.1uF Cap ]---- Output (8V) ( Pin 2: GND ) ```