The term **2211-R** typically refers to a specific package size and tolerance rating for surface-mount technology (SMT) components, most commonly **Resistors** or **Ceramic Capacitors**. In the electronics industry, these codes define the physical footprint and electrical characteristics of the part. --- ### 1. Breakdown of the Code "2211-R" | Component Part | Meaning | Details | | :--- | :--- | :--- | | **2211** | **Case Size (Imperial)** | Represents dimensions of approximately 0.22 x 0.11 inches (5.6 x 2.8 mm). | | **R** | **Tolerance/Value Indicator** | Usually denotes a **±0.05%** or **±0.1%** precision rating, or acts as a decimal point in resistance values. | ### 2. Physical Dimensions The "2211" footprint is considered a large SMT size, often used when high power dissipation or high voltage handling is required. | Dimension | Measurement (Metric) | Measurement (Imperial) | | :--- | :--- | :--- | | Length | 5.60 mm | 0.220 in | | Width | 2.80 mm | 0.110 in | ### 3. Common Component Types While many parts can use this footprint, the two most common are: #### A. Thin Film Precision Resistors * **Purpose:** Used in medical equipment, telecommunications, and instrumentation. * **Key Feature:** High stability and low noise. * **The "R":** Often signifies a high-precision tolerance (Resistance variation is extremely low). #### B. Multilayer Ceramic Capacitors (MLCC) * **Purpose:** Power supply filtering and decoupling. * **Key Feature:** Higher capacitance values than smaller packages (like 0402 or 0603) due to larger physical volume. --- ### 4. Comparison with Standard Sizes To understand where the 2211 sits in the hierarchy of electronic components: | Size Code | Size (mm) | Common Usage | | :--- | :--- | :--- | | 0402 | 1.0 x 0.5 | Smartphones / Consumer Electronics | | 1206 | 3.2 x 1.6 | General purpose Industrial | | **2211** | **5.6 x 2.8** | **High Power / High Precision / Specialized** | | 2512 | 6.3 x 3.2 | Current Sensing / High Wattage | --- ### 5. Example Specification If you see a part labeled `2211-R` in a datasheet, it might look like this in code: ```json { "part_number": "ERJ-L1W_2211R", "category": "Fixed Resistor", "mounting_type": "Surface Mount", "package_inches": "2211", "power_rating": "1.0W - 2.0W", "tolerance": "±0.1% (R Code)" } ```