Overview
The CRCW08054K99FKEA is a surface-mount thick film resistor belonging to Vishay's CRCW series. With a resistance value of 4.99kΩ and 1% tolerance, it offers excellent performance in compact electronic designs. The 0805 package size (2.0mm × 1.25mm) makes it suitable for space-constrained applications while maintaining good power handling capability (typically 0.125W). These resistors are RoHS compliant and designed for automated assembly processes.
Structure and Working Principle
This resistor consists of a ceramic substrate with a ruthenium oxide-based thick film resistive element, protected by a glass coating. Nickel barrier layers and tin-plated terminations ensure reliable solderability. When current flows through the resistive element, it creates a voltage drop proportional to the resistance value (V=IR). The stable thick film formulation maintains consistent resistance across temperature variations within specified limits (±100ppm/°C for this model).
Key Features
The CRCW08054K99FKEA offers several technical advantages including tight tolerance (F=±1%), excellent long-term stability (ΔR≤0.5% after 1000 hours at 70°C), and moisture resistance (per MIL-STD-202 Method 106). Its flame-retardant coating meets UL94 V-0 standards, making it suitable for safety-critical applications. The device can withstand soldering temperatures up to 260°C for 10 seconds, compatible with lead-free soldering processes.
Application Areas
This resistor is commonly deployed in power supplies, measurement equipment, automotive electronics (under-hood applications when properly qualified), and industrial control systems where precision and reliability are crucial. In consumer electronics, it finds use in smart home devices, wearables, and IoT products. The military/aerospace version (when available) serves in avionics and defense systems where component stability is paramount.
Maintenance and Precautions
For optimal performance, avoid mechanical stress during handling and assembly. The resistor is not designed for trimming or adjustment after manufacture. Storage should be in dry conditions (≤40°C/90% RH) to prevent termination oxidation. When cleaning PCBs, use appropriate solvents that won't damage the protective coating. Never exceed the maximum working voltage (150V for this model).
B2B Procurement Guide
Industrial buyers should verify manufacturer part number suffixes which may indicate packaging options (tape/reel, bulk). Minimum order quantities typically range from 1,000 to 10,000 pieces for standard pricing. Consider requesting certification documentation (RoHS, REACH, halogen-free) for compliance purposes. For automotive applications, confirm AEC-Q200 qualification status. Lead times vary from stock availability to 12+ weeks for large custom orders.
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