The **78L10ML-AA3-R** is a specific part number for a low-power linear voltage regulator. It belongs to the 78Lxx series, which is the low-current version of the classic 78xx family of fixed-output positive voltage regulators. Below is a detailed breakdown of its specifications, pinout, and characteristics. --- ### 1. General Specifications The device is designed to provide a stable 10V output from a higher variable input voltage. | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 10V | | **Output Current ($I_{out}$)** | Up to 100mA | | **Maximum Input Voltage** | 30V - 35V (Typical) | | **Quiescent Current** | ~3mA to 5mA | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SOT-89 (Commonly denoted by the "AA3" suffix) | --- ### 2. Part Number Deciphering Manufacturers use specific codes to identify features. Based on UTC (Unisonic Technologies) standards: * **78L**: Low-power linear regulator (100mA series). * **10**: Fixed output voltage of **10 Volts**. * **ML**: Often refers to specialized tolerance levels or specific lead-free/halogen-free material rankings. * **AA3**: Indicates the **SOT-89** surface-mount package. * **R**: Denotes **Tape & Reel** packaging for automated assembly. --- ### 3. Pin Configuration (SOT-89) When looking at the flat side of the SOT-89 package with the leads pointing down: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **VOUT** | Regulated 10V output | | **2** | **GND** | Ground (Connected to the large heat sink tab) | | **3** | **VIN** | Unregulated input voltage | --- ### 4. Key Features & Protections * **Internal Current Limiting:** Prevents the device from burning out if the output is short-circuited. * **Thermal Overload Protection:** The device will shut down if its internal temperature exceeds safe limits. * **No External Components Required:** Aside from basic decoupling capacitors (usually 0.33µF on input and 0.1µF on output), it is a "plug-and-play" solution. --- ### 5. Application Circuit Example To use this part effectively, capacitors should be placed as close to the pins as possible to prevent oscillation. ```c Vin (12.5V - 25V) │ ┌───┴───┐ │ VIN │ [0.33uF] │ (78L10) │ GND │ └───┬───┘ │ Vout (10V Fixed) ├─────────○ [0.1uF] │ GND ``` ---