Overview
The RT0805BRD0740K2L is a precision surface-mount resistor from Yageo's RT series, offering 40.2kΩ resistance with ±0.1% tolerance. Designed for industrial and consumer electronics, this thick-film component meets AEC-Q200 automotive-grade standards for reliability. As an 0805 package device (2.0mm x 1.25mm), it balances size and performance, supporting reflow soldering processes. The resistor operates across -55°C to +155°C with a 100ppm/°C temperature coefficient, making it suitable for stable circuit designs.
Structure and Working Principle
The resistor comprises a ceramic substrate with ruthenium oxide-based resistive layer, protected by glass coating and nickel/tin-plated terminations. Laser trimming achieves the precise 40.2kΩ value during manufacturing. When current flows through the conductive film, it creates a voltage drop proportional to resistance (V=IR). The 0805 package's compact design minimizes parasitic inductance (<1nH), crucial for high-frequency applications up to several GHz.
Key Features
1. **Precision**: ±0.1% tolerance ensures accurate voltage division in measurement circuits. 2. **Stability**: 100ppm/°C TCR maintains performance across temperature variations. 3. **Power Handling**: 1/8W rating suits low-power digital and analog circuits. 4. **Reliability**: 85°C/85% RH 1000-hour test passed per JIS C 5201 standards. Additional features include Pb-free terminations (RoHS compliant) and anti-sulfur construction for harsh environments. The matte finish reduces light reflection in optical applications.
Application Areas
Primary applications include: - **Automotive Electronics**: ECU signal conditioning, sensor interfaces - **IoT Devices**: Impedance matching in RF modules - **Medical Equipment**: Patient monitoring circuit boards - **Industrial Controls**: PLC I/O modules requiring stable resistance The resistor's ESD resistance (1kV HBM) makes it suitable for human-interface devices. In audio equipment, its low noise characteristics preserve signal integrity.
Maintenance and Precautions
1. **Soldering**: Follow J-STD-020 profiles (peak 260°C for 10s max). 2. **Cleaning**: Use alcohol-based cleaners; avoid ultrasonic for >3 minutes. 3. **Storage**: Keep in dry environment (<40°C/90% RH) with original packaging. Mechanical stress from board flexing or component insertion may crack the ceramic substrate. Always perform visual inspection under 10x magnification after assembly.
B2B Procurement Guide
1. **MOQ**: Typically 3,000-5,000 pieces per reel; negotiate for sample quantities. 2. **Lead Time**: 6-8 weeks for custom values; standard stock usually available. 3. **Certifications**: Request CoC with test reports for MIL-PRF-55342 compliance. 4. **Alternatives**: Compare with Vishay's CRCW0805 or KOA's RK73H series for cost/performance balance. For high-reliability applications, specify extended life testing (1,000-hour 125°C bake). Consider tape-and-reel packaging for automated assembly lines.
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