The **CCT-49K84D-R** is a specific technical component often associated with **high-power thick film chip resistors** or specialized resistor networks. Based on the naming convention (which aligns with manufacturers like Viking Tech or similar industrial electronic suppliers), here is a breakdown of its electronic characteristics. --- ### 1. Key Technical Specifications Below are the typical electronic parameters for this series: | Parameter | Details | | :--- | :--- | | **Component Type** | Thick Film Chip Resistor | | **Resistance Value** | Often 49.9k $\Omega$ (indicated by "49K8") | | **Tolerance** | Typically ±0.5% or ±1% (D-rating) | | **Package Size** | Case size varies (e.g., 0402, 0603, or 0805) | | **Power Rating** | 1/16W to 1/4W depending on the specific package | | **Temperature Coefficient** | ±50ppm/°C to ±100ppm/°C | --- ### 2. Composition and Materials The "Electronic Parts" within this component are layered to ensure stability and conductivity: * **Substrate:** Usually made of **High-purity Alumina (Al2O3)** ceramic for thermal management and electrical insulation. * **Resistive Layer:** A "Thick Film" paste made of ruthenium oxide ($RuO_2$) or similar metallic glass materials. * **Internal Electrode:** Silver (Ag) or Palladium-Silver (AgPd) to provide low-resistance contact. * **Protective Coating:** An epoxy or glass overlay that shields the resistive element from humidity and mechanical damage. * **Termination:** A solderable layer usually consisting of Nickel (Ni) barrier and a Tin (Sn) outer coating to prevent "leaching" during soldering. --- ### 3. Application in Circuits This part is commonly used in the following electronic environments: 1. **Voltage Dividers:** Due to its precision (0.5%), it is ideal for setting reference voltages. 2. **Signal Conditioning:** Used in Op-amp feedback loops to maintain gain stability. 3. **Power Management:** Acting as a pull-up or pull-down resistor in sensitive digital logic circuits. 4. **Industrial Controls:** Its "R" suffix often denotes compliance with **RoHS** standards, making it suitable for modern industrial PCBs. --- ### 4. Part Number Decoder (Typical) | Code Segment | Meaning | | :--- | :--- | | **CCT** | Series Prefix (Common for Thick Film Technology) | | **49K8** | Resistance value: 49.8k or 49.9k Ohms | | **D** | Tolerance Code (D = ±0.5%) | | **R** | RoHS Compliant / Lead-Free Packaging |