The part number **HT-25V331MH10EX-R2** refers to a high-temperature, surface-mount (SMD) aluminum electrolytic capacitor. This component is typically used in automotive electronics, industrial power supplies, and LED lighting due to its durability under high thermal stress. --- ### 1. Component Specifications Below are the technical parameters derived from the standard naming convention for this series: | Parameter | Value / Detail | | :--- | :--- | | **Component Type** | Aluminum Electrolytic Capacitor | | **Mounting Type** | SMD (Surface Mount Device) | | **Capacitance** | 330 µF (Microfarads) | | **Voltage Rating** | 25V DC | | **Tolerance** | ±20% (Standard for electrolytic) | | **Series** | HT Series (High Temperature / Low Impedance) | | **Operating Temp** | -55°C to +125°C (Typical for HT series) | | **Dimensions** | Approx. 10mm Diameter (indicated by 'H10') | --- ### 2. Breakdown of the Part Number The alphanumeric string follows a specific manufacturer coding logic: * **HT**: The series prefix, indicating **High Temperature** and high reliability. * **25V**: The rated working voltage (Maximum voltage the part can handle continuously). * **331**: The capacitance code. The first two digits (33) are the base value, and the third (1) is the multiplier ($10^1$). So, $33 \times 10 = 330$ µF. * **M**: Tolerance code (M = ±20%). * **H10**: Refers to the physical case size (Case diameter of 10mm). * **EX-R2**: Packaging and internal material codes (usually refers to RoHS compliance and Tape & Reel packaging). --- ### 3. Key Applications and Features * **High Thermal Stability:** Designed to maintain its capacitance and ESR (Equivalent Series Resistance) characteristics even at temperatures up to 125°C. * **Vibration Resistance:** As an SMD component, it is often used in environments with mechanical vibration, such as engine control units (ECUs). * **Smoothing & Filtering:** Primarily used in DC-DC converters to smooth out voltage ripples and provide stable power to sensitive microcontrollers. --- ### 4. Circuit Symbol and Footprint ```cpp // Schematic Symbol Representation // + || // -----||----- (Polarized Capacitor) // - || ``` *Note: This is a **polarized** component. Reversing the polarity during PCB assembly will likely cause the component to fail or vent (explode).*