## UTC 78L08ML-T92-R Overview The **78L08ML-T92-R** is a 3-terminal positive voltage regulator designed for local on-card regulation. It belongs to the 78Lxx series, which is a low-power version of the standard 78xx series. --- ### 1. Part Number Breakdown Understanding the suffix and prefix is crucial for identifying the specific package and electrical characteristics: | Code Segment | Meaning | | :--- | :--- | | **78** | Positive Voltage Regulator Series | | **L** | Low Power (typically 100mA max output) | | **08** | Output Voltage (8 Volts) | | **ML** | UTC Manufacturer Specific (Standard Grade) | | **T92** | TO-92 Plastic Package | | **R** | Tape & Reel Packaging (RoHS Compliant) | --- ### 2. Key Technical Specifications Below are the primary electrical characteristics of the 78L08ML: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | +8.0V DC | | **Input Voltage (Max)** | 30V DC | | **Output Current** | Up to 100mA | | **Quiescent Current** | ~3.0mA to 5.0mA | | **Operating Temperature** | -40°C to +125°C | | **Short Circuit Protection** | Internal Thermal Overload and Current Limiting | --- ### 3. Pin Configuration (TO-92 Package) When looking at the flat side of the TO-92 package with the leads pointing down: 1. **Pin 1: V-OUT** (Regulated 8V Output) 2. **Pin 2: GND** (Ground/Common) 3. **Pin 3: V-IN** (Unregulated Input Voltage) --- ### 4. Typical Application Circuit To ensure stability and reduce noise, external capacitors are recommended: ```text Input (9.5V-25V) 8V Output | | [IN] --+---[ 78L08 ]---+--- [OUT] | | | C_in GND C_out (0.33uF) | (0.1uF) | | | ---------+-------+-------+--------- Ground ``` ### 5. Features and Benefits * **Internal Protection:** Features internal thermal-overload protection and internal short-circuit current limiting. * **No External Components:** In many cases, it can function without external components, though capacitors are highly recommended for high-frequency noise rejection. * **Replacement for Zener Diodes:** Offers significantly better output impedance and lower bias current compared to a Zener diode/resistor combination. ---