The part number **C20-R056K-R** refers to a specific type of electronic component, typically a **Thick Film Chip Resistor**. Based on standard industry nomenclature (commonly used by manufacturers like Cyntec or similar specialty resistor brands), here is the detailed breakdown. ### 1. Part Number Deciphering | Component Segment | Value | Description | | :--- | :--- | :--- | | **C20** | Case Size | Refers to the **2010** metric/imperial size (approx. 5.0mm x 2.5mm). | | **R056** | Resistance Value | **0.056 Ohms** (56 mΩ). This is a "Current Sense" or low-ohmic resistor. | | **K** | Tolerance | **±10%** (though in some series, K can represent ±10%, J is ±5%). | | **R** | Packaging | **Tape & Reel** (Standard for automated SMD assembly). | --- ### 2. Key Specifications These parts are designed for surface-mount technology (SMT) and are widely used in power management circuits. * **Type:** Current Sensing Resistor (Shunt). * **Power Rating:** Typically **0.5W to 1W** (depending on the specific series rating for a 2010 package). * **Operating Temperature:** Generally **-55°C to +155°C**. * **Construction:** Thick film on a ceramic substrate with a protective overcoat. --- ### 3. Common Applications Because the resistance is extremely low (56 milliohms), this part is not used for standard voltage dropping, but rather for measuring current flow: 1. **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in laptops or power tools. 2. **DC-DC Converters:** Providing feedback to a controller to prevent over-current conditions. 3. **Motor Control:** Detecting the torque/load on a motor by measuring the current draw. 4. **LED Drivers:** Ensuring constant current delivery to high-power LEDs. --- ### 4. Component Layout (Footprint) | Dimension | Measurement (Approx.) | | :--- | :--- | | **Length (L)** | 5.00 mm | | **Width (W)** | 2.50 mm | | **Height (H)** | 0.60 mm | --- ### 5. Selection Considerations * **Power Dissipation:** Since $P = I^2 \times R$, ensure the current passing through the resistor does not exceed its wattage rating ($0.056 \times I^2 < Wattage$). * **Inductance:** Being a thick film chip, it has low inductance, making it suitable for high-frequency switching power supplies. ---