## Overview of 47LT-14W2YR-R The **47LT-14W2YR-R** is a specific part number belonging to a series of **Gas Discharge Tube (GDT)** surge arresters, typically manufactured by companies like **Littelfuse** (or affiliated brands). These components are designed to protect sensitive electronic equipment from high-voltage transients, such as lightning strikes or industrial power surges. --- ### Technical Specifications Below are the primary electrical and physical characteristics of this specific component: | Feature | Specification | | :--- | :--- | | **Component Type** | Gas Discharge Tube (GDT) | | **DC Spark-over Voltage** | 4700V (4.7kV) | | **Number of Electrodes** | 2 | | **Lead Configuration** | Axial Leaded (Through-hole) | | **Tolerance** | ±20% | | **Series** | LT Series (High Voltage) | | **RoHS Status** | Compliant (indicated by the -R suffix) | --- ### Key Functions and Features 1. **High Voltage Protection**: With a spark-over voltage of 4700V, this device remains an open circuit under normal conditions. Once the voltage exceeds its threshold, the internal gas ionizes, creating a low-resistance path to shunt the excess energy to the ground. 2. **Low Capacitance**: Unlike Varistors (MOVs), GDTs have extremely low capacitance (often <1pF). This makes them ideal for high-speed signal lines where signal integrity is critical. 3. **High Insulation Resistance**: Before the breakdown occurs, the device maintains very high insulation resistance (typically >1 GΩ), ensuring it does not interfere with the circuit operation. 4. **Ruggedness**: Designed to handle multiple high-current surges without significant degradation, provided they are within the rated pulse limits. --- ### Applications The 47LT-14W2YR-R is commonly found in the following environments: * **Power Supplies**: Used for primary protection on the AC line side. * **Telecommunications**: Protecting base stations and outdoor equipment from atmospheric disturbances. * **Industrial Equipment**: High-voltage machinery where inductive switching or lightning could cause catastrophic failure. * **Medical Equipment**: Isolation and protection for sensitive diagnostic tools. --- ### Naming Convention Breakdown | Segment | Meaning | | :--- | :--- | | **47** | Represents the voltage rating (4700V). | | **LT** | Series designation (Littelfuse High Voltage series). | | **14** | Physical diameter/size code. | | **W** | Lead wire configuration. | | **2YR** | Specific internal manufacturing code/Packaging style. | | **-R** | RoHS (Restriction of Hazardous Substances) Compliant. |