The part number **HT-35V680MF80EQ-R2** refers to a high-temperature, surface-mount (SMD) aluminum electrolytic capacitor. Below is a detailed breakdown of its specifications and electronic characteristics. ### 1. Part Number Breakdown Based on standard industry nomenclature for electrolytic capacitors, the code can be decoded as follows: | Segment | Meaning | Value / Description | | :--- | :--- | :--- | | **HT** | Series Code | High Temperature / Low Impedance series | | **35V** | Rated Voltage | 35 Volts DC (Maximum working voltage) | | **680** | Capacitance | 68 µF (Microfarads) | | **M** | Tolerance | ±20% (Standard industry tolerance) | | **F80** | Case Size | Often refers to diameter x length (e.g., 6.3 x 8.0 mm) | | **EQ** | Terminal/Special | Standard SMD (Chip) lead-free terminals | | **R2** | Packaging | Tape and Reel (for automated pick-and-place) | --- ### 2. Technical Specifications These components are designed for durability in automotive and industrial power applications. * **Capacitance:** 68 µF. * **Voltage Rating:** 35V DC (Surge voltage is typically 1.15x higher). * **Temperature Range:** -55°C to +105°C (Standard) or up to +125°C for specific HT variants. * **Impedance/ESR:** Characterized by "Low ESR" to handle ripple current efficiently without overheating. * **Life Endurance:** Usually rated for 2,000 to 5,000 hours at its maximum temperature rating. --- ### 3. Key Electronic Characteristics #### A. Dielectric Structure This part uses an aluminum oxide layer as the dielectric and a liquid electrolyte. Because it is a "V-Chip" (Vertical Chip) style, it is designed to be soldered directly onto the surface of a PCB. #### B. Polarity As an electrolytic capacitor, it is **polarized**. The top of the cylindrical can usually features a black or colored marking indicating the **negative (-)** terminal. Reversing polarity can cause the component to fail or vent. #### C. Ripple Current Handling The "HT" series is optimized to handle high ripple currents, making it suitable for DC-DC converters where high-frequency switching occurs. --- ### 4. Common Applications * **Power Supplies:** Filtering input/output noise in switching regulators. * **Automotive Electronics:** Used in ECU modules due to vibration resistance and temperature stability. * **LED Drivers:** Smoothing the current to prevent flickering. * **Industrial Automation:** Decoupling high-frequency noise on control boards.