The **SC-1-R** is a high-performance electronic component primarily used as a **Current Sense Resistor** or within specific high-frequency shielding/switching applications depending on the manufacturer (most notably associated with companies like *Susumu* or *Soshin*). Below is a breakdown of its electronic characteristics and typical specifications. --- ### 1. Key Specifications The SC-1-R series is designed for precision and stability. While parameters can vary slightly by manufacturer, these are the standard technical attributes: | Feature | Typical Specification | | :--- | :--- | | **Component Type** | Current Sense Resistor / Chip Resistor | | **Resistance Value** | Low Ohmic values (often R-range, e.g., 0.1Ω - 1Ω) | | **Tolerance** | ±0.5% to ±1% (High Precision) | | **Power Rating** | 0.5W to 1.0W (depending on footprint) | | **Temperature Coefficient (TCR)** | Low (±50ppm/°C to ±100ppm/°C) | | **Operating Temperature** | -55°C to +155°C | --- ### 2. Physical Construction The "R" in the suffix usually denotes **RoHS Compliance** (Lead-Free). The physical build typically includes: * **Substrate:** High-purity Alumina ceramic. * **Resistive Element:** Metal foil or thick film alloy for low inductance. * **Termination:** Wrap-around terminals with a Nickel barrier and Tin (Sn) plating for easy soldering. * **Coating:** Protective epoxy or glass-layer resin to resist moisture and mechanical stress. --- ### 3. Electronic Functions The SC-1-R serves three primary roles in a circuit: 1. **Current Sensing:** By placing it in series with a load, the voltage drop across the SC-1-R is measured to calculate current flow ($I = V/R$). 2. **Power Management:** Used in DC-DC converters to monitor output stages and prevent overcurrent conditions. 3. **Signal Conditioning:** Its low inductance makes it ideal for high-frequency switching power supplies, reducing noise and "ringing" in the signal. --- ### 4. Typical Application Circuit In a standard current-sensing application, the SC-1-R is placed between the load and the ground (Low-side sensing). ```cpp // Schematic Logic [Power Source] ---> [Load] ---> [SC-1-R Resistor] ---> [GND] | v [To Differential Amplifier] ``` ---