The part number **HTK-25V561MHC5E-R2** identifies a specific high-performance aluminum electrolytic capacitor, typically manufactured by companies like **Jianghai** or similar specialized passive component producers. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Part Number Decoder To understand the component, we break down the alphanumeric code: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **HTK** | Series Code | High temperature, high reliability, low ESR series. | | **25V** | Voltage Rating | 25 Volts (DC). | | **561** | Capacitance | 560 $\mu$F (56 followed by 1 zero). | | **M** | Tolerance | ±20% (Standard industry code). | | **HC5** | Case Size | Specific dimensions (typically ~8x11.5mm or 10x12.5mm). | | **E-R2** | Packaging/Lead | Refers to taping/reeling or specific lead formation (RoHS compliant). | --- ## 2. Technical Specifications This component is designed for power management applications where stability and longevity are critical. ### Electrical Characteristics * **Capacitance:** 560 microfarads ($\mu$F). * **Rated Voltage:** 25V DC (Maximum continuous operating voltage). * **Surge Voltage:** Usually 1.15x the rated voltage (~28.75V). * **ESR (Equivalent Series Resistance):** Very low. This minimizes heat generation during high ripple current cycles. * **Operating Temperature:** Typically rated for **-55°C to +105°C** (or +125°C depending on the specific HTK sub-grade). ### Physical Attributes * **Type:** Radial Lead Aluminum Electrolytic Capacitor. * **Mounting Type:** Through-hole (THT). * **Polarity:** Polarized (must be installed correctly to avoid failure). --- ## 3. Key Features & Applications ### Key Features 1. **Low Impedance:** Optimized for high-frequency switching environments. 2. **Long Life:** Designed for high "load life" (often 2,000 to 5,000 hours at maximum rated temperature). 3. **High Ripple Current:** Can handle significant AC components riding on the DC signal without overheating. ### Common Applications * **Switching Power Supplies (SMPS):** Used for filtering output noise. * **DC-DC Converters:** Acts as a reservoir for energy storage and voltage smoothing. * **Motherboards/Industrial PCs:** Providing stable voltage rails for processors and logic. * **LED Drivers:** Filtering the rectified AC to provide smooth DC for LEDs. --- ## 4. Selection Considerations When replacing or designing with this part, keep the following in mind: * **Size Constraints:** Ensure the `HC5` case size fits the physical footprint of your PCB. * **Voltage Margin:** It is standard practice to use a capacitor with a voltage rating at least 20% higher than the actual operating voltage. * **Polarity:** The longer lead is usually positive (+), and the stripe on the body indicates the negative (-) terminal.