The **RVR-4V221MF61U-R2** is a surface-mount (SMD) aluminum electrolytic capacitor produced by **ELNA**. This specific part belongs to the **RVR series**, which is characterized by its high temperature resistance and low impedance properties. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Component Type** | Aluminum Electrolytic Capacitor (SMD) | | **Capacitance** | 220 µF | | **Rated Voltage** | 4V DC | | **Tolerance** | ±20% at 120Hz, 20°C | | **Operating Temperature** | -40°C to +105°C | | **Case Size Code** | F61 (typically 6.3mm diameter x 5.8mm height) | | **Series** | RVR (Low Impedance / High Reliability) | | **Endurance** | 2,000 hours at 105°C | --- ### 2. Part Number Breakdown The alphanumeric code follows ELNA's standard naming convention: 1. **RVR**: Series name (Vertical Chip, Low Impedance). 2. **4V**: Rated Working Voltage (4 Volts). 3. **221**: Capacitance code (22 followed by 1 zero = 220µF). 4. **M**: Tolerance code (M = ±20%). 5. **F61**: Case Size dimensions (Diameter x Length). 6. **U**: Packaging style (typically relates to taping/reeling). 7. **R2**: RoHS compliance / Revision code. --- ### 3. Key Applications Because this capacitor is designed for low impedance and high temperature, it is commonly found in: * **Power Supplies:** Filtering and smoothing in DC-DC converters. * **Consumer Electronics:** Laptop motherboards and high-density PCB designs. * **Telecommunications:** Network routers and switching equipment where space is limited. --- ### 4. Comparison: Standard vs. RVR Series | Feature | Standard (e.g., RV Series) | RVR Series | | :--- | :--- | :--- | | **Impedance** | High | Low | | **Reflow Soldering** | Standard | Lead-free compatible | | **Life Span** | 1000 - 2000 hours | 2000 hours (enhanced stability) |