The **FCR-25-R** is an electronic component, specifically a **Metal Oxide Film Resistor**. It is part of the FCR (Fixed Carbon/Metal Oxide) series, designed for general-purpose applications where stability and power handling are required in a small footprint. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. Key Technical Specifications The "FCR-25-R" nomenclature usually follows a standard industry coding system: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Type** | Metal Oxide Film | High stability and reliability | | **Power Rating** | 0.25 Watts (1/4W) | Standard low-power rating | | **Resistance Range** | Variable (R denotes series) | Depends on the specific value ordered | | **Tolerance** | ±5% (Typical) | Standard industrial tolerance | | **Package/Style** | Axial Leaded | Through-hole mounting | | **Operating Temp** | -55°C to +155°C | Wide thermal operating range | --- ### 2. Construction and Materials The FCR-25-R is built using layers that ensure it can handle heat better than standard carbon film resistors. 1. **Ceramic Core:** A high-grade ceramic rod acts as the base. 2. **Resistive Element:** A thin film of Metal Oxide is deposited onto the rod. 3. **End Caps:** Tin-plated copper leads are pressed onto the ends for electrical connectivity. 4. **Coating:** The body is coated with a flameproof synthetic resin (usually gray or small-blue) to provide insulation and environmental protection. --- ### 3. Electronic Performance Features * **Flameproof Protection:** Unlike carbon resistors, metal oxide films do not catch fire under extreme overload; they open the circuit safely. * **Low Noise:** Provides better signal-to-noise ratios compared to carbon composition resistors. * **High Pulse Stability:** Capable of withstanding moderate surges and pulses without degrading the resistive element. * **Voltage Coefficient:** Very low, meaning the resistance remains stable even as the applied voltage changes. --- ### 4. Typical Applications The FCR-25-R is commonly found in: * **Consumer Electronics:** TV power boards, audio amplifiers, and household appliances. * **Power Supplies:** Used as bleeder resistors or in control circuits. * **Industrial Controls:** Signal conditioning and voltage dividers. --- ### 5. Identification (Color Coding) Since this is an axial resistor, the value is identified by four color bands: 1. **1st Band:** First digit. 2. **2nd Band:** Second digit. 3. **3rd Band:** Multiplier. 4. **4th Band:** Tolerance (Gold = 5%).