The **O2104** is a specific surface-mount technology (SMT) component package, most commonly associated with **multilayer ceramic capacitors (MLCCs)**. In the electronics industry, this designation refers to the physical dimensions of the part. --- ### 1. Understanding the Dimensions The numbers "2104" refer to the length and width of the component. It is important to distinguish between **Imperial** and **Metric** codes, as "2104" is an uncommon hybrid or specific manufacturer designation (often associated with high-precision or high-frequency parts). | Specification | Dimension (mm) | Dimension (inches) | | :--- | :--- | :--- | | **Length** | 2.1 mm | 0.082 in | | **Width** | 0.4 mm | 0.015 in | | **Height** | Varies by value | Varies by value | ### 2. Key Electronic Characteristics Parts in the 2104 footprint are typically specialized capacitors used in high-frequency applications (like RF circuits or high-speed data lines). * **Low Inductance:** Because of the elongated shape (long side termination), these parts often feature **Low Equivalent Series Inductance (ESL)**. * **Voltage Rating:** Usually ranges from 4V to 25V depending on the dielectric material. * **Dielectric Types:** Commonly found in **X5R, X7R, or C0G (NP0)** materials for stability. * **Termination:** Often features "Reverse Geometry" (the terminals are on the long sides) to minimize the current loop and reduce noise. ### 3. Common Applications Due to their specific physical profile, these parts are used in: 1. **Decoupling:** Power integrity for high-speed CPUs and GPUs. 2. **RF Filtering:** Minimizing signal loss in wireless communication modules. 3. **Space-Constrained PCB Design:** Slim profiles for mobile devices or wearables. ### 4. Comparison with Standard Packages | Package Code | Length (mm) | Width (mm) | Common Usage | | :--- | :--- | :--- | :--- | | **0201 (Imperial)** | 0.6 | 0.3 | Standard Micro-electronics | | **O2104 (Special)** | 2.1 | 0.4 | High-speed / Low ESL | | **0805 (Imperial)** | 2.0 | 1.25 | General Purpose | ---