The **AISC-1008-R056** is a specific model of an **NTC (Negative Temperature Coefficient) Power Thermistor**. These components are primarily used for limiting **inrush current** in electronic circuits, such as power supplies and motor controllers. --- ### 1. Key Technical Specifications Based on the part number nomenclature, the following table details its physical and electrical characteristics: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Resistance at 25°C** | 10 $\Omega$ | The "100" in the part number indicates 10 Ohms. | | **Max. Steady State Current** | 8 Amperes | The "8" indicates the continuous current rating. | | **Body Diameter** | ~15mm to 20mm | The "R056" or similar suffixes often refer to size/lead spacing. | | **Material Type** | Metal Oxide | Typically composed of sintered metal oxide ceramics. | | **Operating Temperature** | -55°C to +200°C | Standard range for power thermistors. | --- ### 2. How It Works (The "Negative" Effect) The AISC-1008-R056 functions as a variable resistor that reacts to heat: 1. **At Startup (Cold State):** The device has a high resistance (10 Ohms). When the power is first turned on, this resistance limits the massive "surge" of current that would otherwise damage components like bridge rectifiers or filter capacitors. 2. **During Operation (Hot State):** As current flows through the thermistor, it heats up due to the Joule effect ($P=I^2R$). Because it is a **Negative** Temperature Coefficient device, its resistance **drops** significantly as it gets hot. 3. **Steady State:** Once hot, the resistance becomes negligible (often less than 0.5 Ohms), allowing the circuit to operate efficiently with minimal power loss. --- ### 3. Applications and Installation These parts are critical in high-power environments to prevent blown fuses or tripped circuit breakers. * **Switching Mode Power Supplies (SMPS):** To protect the input filter capacitors. * **AC Motors:** To soften the start-up torque and current draw. * **Transformers:** To handle the magnetizing inrush current. #### **Safety Note:** > **High Temperature:** During normal operation, this component is designed to get very hot (often exceeding 100°C). It should be mounted with sufficient lead length and away from heat-sensitive components like electrolytic capacitors. ---