The part number **HTK-25V561MHC5EXN-R2** refers to a high-performance **Aluminum Electrolytic Capacitor**, typically manufactured by companies like **Lelon** (based on the HTK series coding). It is designed for surface-mount (SMD) applications where high temperature and low impedance are required. --- ### 1. Part Number Breakdown | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | HTK | High Temperature, Low Impedance (usually 125°C rated) | | **Voltage** | 25V | Rated DC Working Voltage: 25 Volts | | **Capacitance** | 561 | 560 microfarads (µF). The '1' is the multiplier ($10^1$) | | **Tolerance** | M | ±20% Tolerance | | **Size Code** | HC5 | Refers to Case Dimensions (Diameter x Height) | | **Features** | EXN | Internal codes for specific electrolyte or terminal types | | **Packaging** | R2 | Tape and Reel (usually indicates the reel size/quantity) | --- ### 2. Key Technical Specifications Based on the standard HTK series profile: * **Capacitance:** 560 µF * **Rated Voltage:** 25V DC * **Operating Temperature:** -55°C to +125°C (Extreme range) * **Endurance:** Long life, often 2,000 to 5,000 hours at 125°C. * **Mounting Type:** SMD (Surface Mount Device) / V-Chip. * **Impedance:** Low ESR (Equivalent Series Resistance), making it efficient for high-frequency noise filtering. --- ### 3. Core Component Functions This capacitor performs three primary roles in an electronic circuit: 1. **Filtering:** It smooths out ripples in power supplies to provide stable DC voltage to sensitive components. 2. **Energy Storage:** Acts as a temporary reservoir to provide current during sudden load spikes. 3. **Decoupling:** Prevents high-frequency noise from transferring between different stages of a circuit. --- ### 4. Typical Applications Because of the **125°C** temperature rating and **low impedance**, this part is commonly used in: * **Automotive Electronics:** Engine control units (ECU), ADAS, and lighting modules. * **Industrial Power Supplies:** DC-DC converters and switching regulators. * **LED Drivers:** Where heat dissipation is high. * **Telecommunications:** Base station power modules.