The part number **CCF-55412RFKR36** refers to a high-quality, professional-grade metal film resistor manufactured by **Vishay Dale**. It is specifically part of the CCF-55 series, which is designed to meet or exceed military-style specifications (similar to RN55 and RL07). ### 1. Part Number Breakdown To understand the component, we must decode the alphanumeric string: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | CCF-55 | Metal Film Resistor, 1/4W to 1/2W size | | **Resistance** | 412R | 412 Ohms | | **Tolerance** | F | ± 1% | | **Temp. Coeff.** | K | ± 100 ppm/°C | | **Packaging** | R36 | Taped and reeled (typically 5,000 pieces) | --- ### 2. Technical Specifications The CCF-55 series is known for its reliability and precision in signal-processing applications. | Feature | Specification | | :--- | :--- | | **Resistance Value** | 412 $\Omega$ | | **Power Rating** | 0.25 W (1/4 W) at 70°C | | **Maximum Working Voltage** | 250 V | | **Operating Temp. Range** | -65°C to +165°C | | **Construction** | Metal film on high-grade ceramic core | | **Coating** | Flame retardant epoxy | --- ### 3. Key Electronic Characteristics 1. **Low Noise:** Metal film construction provides significantly lower thermal noise compared to carbon composition resistors, making it ideal for audio and precision instrumentation. 2. **Stability:** The "K" temperature coefficient ensures the resistance value remains stable even as the internal temperature of the device rises. 3. **Durability:** The leads are solderable and have a high pull strength, designed for through-hole PCB mounting. 4. **Environmental Protection:** The epoxy coating provides moisture resistance and protection against harsh solvents. --- ### 4. Common Applications * **Precision Test Equipment:** Used in multimeters and oscilloscopes where accuracy is vital. * **Audio Circuitry:** High-fidelity pre-amplifiers where low signal-to-noise ratios are required. * **Industrial Controls:** Signal conditioning for sensors and feedback loops. * **Telecommunications:** Network line termination and filtering.