The **S-1C5-R** is a specific electronic component typically identified as a **Radial Lead NTC (Negative Temperature Coefficient) Thermistor**. These parts are primarily used for temperature sensing, compensation, and inrush current limiting. Below is a detailed breakdown of its specifications, construction, and applications. --- ### 1. Key Technical Specifications While exact values can vary slightly by manufacturer (most commonly produced by brands like SEMITEC or similar specialized thermal component makers), the general characteristics are: | Feature | Description | | :--- | :--- | | **Component Type** | NTC Thermistor | | **Resistance at 25°C** | 1.0 $\Omega$ (indicated by the "1" in the part code) | | **Max Steady State Current** | Approx. 5.0 Amperes | | **Tolerance** | Generally ±15% or ±20% | | **Operating Temp Range** | -40°C to +160°C | | **Lead Style** | Radial (Through-hole) | | **Coating** | Silicone or Epoxy resin | --- ### 2. Functional Characteristics * **Negative Temperature Coefficient (NTC):** As the temperature of the component increases, its electrical resistance decreases. * **Inrush Current Limiting:** This specific part is often used to protect circuits. Upon power-up, its high cold resistance limits the initial surge of current. As it heats up due to current flow, its resistance drops significantly, allowing the circuit to operate normally with minimal power loss. * **Thermal Mass:** The "R" suffix often refers to the radial lead configuration and specific packaging (like "Reel" or "RoHS" compliance depending on the manufacturer's catalog). --- ### 3. Applications The S-1C5-R is commonly found in the following environments: 1. **Switch Mode Power Supplies (SMPS):** To prevent blown fuses or tripped breakers during the initial charging of filter capacitors. 2. **Electric Motors:** Used to smooth the startup current of small to medium motors. 3. **LED Lighting Drivers:** Protects the sensitive semiconductor components from high-current spikes. 4. **Transformers:** Used in the primary circuit to handle the inrush current of the magnetic core. --- ### 4. Identification Code Breakdown If we break down the typical nomenclature for this series: * **S:** Series designation (often Power Thermistor). * **1:** Base resistance value (1 Ohm). * **C5:** Physical size/diameter code (often indicating a 10mm to 15mm disc size) and current rating. * **R:** Packaging type (Radial or Tape/Reel). ---