The **78L08ACD-R1** is a member of the 78Lxx series of fixed-voltage monolithic integrated circuit voltage regulators. It is designed for a wide range of applications, particularly those requiring a stable 8V output at low currents. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the 78L08ACD-R1: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 8.0 V | | **Output Current** | Up to 100 mA | | **Input Voltage (Max)** | 30 V | | **Dropout Voltage** | ~1.7 V (typical) | | **Operating Temperature** | 0°C to +125°C | | **Package Type** | SOIC-8 (Small Outline Integrated Circuit) | | **Tolerance** | ±5% (standard for 'A' suffix) | --- ### 2. Pin Configuration (SOIC-8) In the SOIC-8 package, the pinout is often redundant to improve heat dissipation or ease of PCB routing. | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **Output** | Regulated 8V output | | 2, 3, 6, 7 | **GND** | Ground (connected to heat sink/plane) | | 4, 5 | **NC** | No internal connection | | 8 | **Input** | Unregulated DC input voltage | --- ### 3. Internal Protection Features The 78L08ACD-R1 is highly robust due to several built-in safety mechanisms: * **Internal Thermal Overload Protection:** Automatically shuts down the device if the internal temperature exceeds safe limits. * **Short-Circuit Current Limiting:** Prevents the device from being destroyed if the output is shorted to ground. * **Safe-Area Compensation:** Limits the output current as the voltage across the pass transistor increases to keep power dissipation within safe bounds. --- ### 4. Typical Application Circuit To ensure stability and reduce noise, external capacitors are recommended: ```text Input (10V-30V) ----[Cin: 0.33uF]----[ 78L08 ]----[Cout: 0.1uF]---- Output (8V) | Ground ``` * **Cin:** Required if the regulator is located far from the power supply filter. * **Cout:** Improves transient response and ensures stability. --- ### 5. Common Use Cases * **Local On-Card Regulation:** Eliminating noise and distribution problems associated with single-point regulation. * **Voltage Logic Level Shifting:** Powering 8V logic circuits from a higher voltage rail (e.g., 12V or 24V). * **Consumer Electronics:** Used in low-power devices like remote controls, sensor modules, and small audio pre-amps.