The **V10E140AUTO2T** is a specific model of Metal Oxide Varistor (MOV) manufactured by **Littelfuse**. It belongs to the **UltraMOV™ Automotive Series**, which is designed for high-surge current protection in automotive applications. --- ### 1. Technical Specifications The part number itself acts as a code for its primary electrical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Model Number** | V10E140AUTO2T | | **Disc Diameter** | 10 mm | | **Voltage Rating (AC)** | 140 VAC | | **Voltage Rating (DC)** | 180 VDC | | **Varistor Voltage** | 220V (at 1mA DC) | | **Energy Absorption** | 45 Joules (WTM) | | **Peak Surge Current** | 3500 Amps (8/20µs pulse) | | **Operating Temp** | -40°C to +125°C | | **Certification** | AEC-Q200 Qualified | --- ### 2. Breakdown of the Part Number To understand the component's construction, we can deconstruct the identifier: * **V10**: The disc size (10mm diameter). Larger diameters generally handle higher surge currents. * **E**: High-energy series (UltraMOV™). * **140**: The maximum continuous operating voltage (VM(AC)RMS). * **AUTO**: Specifically tested and qualified for automotive environments. * **2T**: Packaging/Lead style (typically indicates Tape and Reel packaging with specific lead spacing). --- ### 3. Key Features and Applications This component is built for harsh environments where voltage spikes (transients) are common. #### Key Features: * **High Temperature**: Rated for up to 125°C, making it suitable for under-the-hood automotive use. * **AEC-Q200**: This is the global stress-test standard for passive components in the automotive industry. * **Fast Response**: Reacts to voltage transients in less than 25 nanoseconds. #### Common Applications: 1. **Load Dump Protection**: Protecting car electronics from spikes when the battery is disconnected while the alternator is charging. 2. **Motor Protection**: Suppressing back-EMF from window motors, wipers, or fans. 3. **ECU Safety**: Protecting Electronic Control Units from power line surges. 4. **Industrial Automation**: Used in 120V/140V AC lines where high-reliability surge protection is required. --- ### 4. Circuit Symbol and Connection In a schematic, a Varistor is represented by a symbol similar to a resistor but with a diagonal line and "U" or "V" hooks. It is typically placed **in parallel** with the load it is protecting. ```text L (Line) o-------+------- [ Load ] -------o N (Neutral) | [MOV] <-- V10E140AUTO2T | GND/PE o--------+ ```